85 ISO 25780:20'11

Plastics piping systems for

pressure and non-pressure

i.:

water supply, irrigation,

drainage or sewerage
Glass-reinforced thermosetting
plastics (Gnp) systems based
on unsaturated polyester (Up)
pipes with flexible
resin
joints-intended to be installed
using jacking techniques

NO COPY]NG WTHOUT BSiPERM 55 ON EXCEPT AS PERMMED

BY COPYB GNT LAW

ra isinq

standards worldwide"

--o
D-rr

l5O 25780:201,

BRITISH STANDARD

National foreword
This British Standard is the uK implementation of ISO 25780:201r.

The UK participation in jts preparation was ent.usted toTechnical

Committee PR!EBi/2, Plastics piping for pressure appliaations.

A list of organizations represented on this committee (an be

obtained on requestto its secretary
This publication does not purportto include allthe necessary
provisions of a contract. lJseB are responsible Ior its (orrect

application.
@

BSt20t1

ISBN 978

0 580 55717 0

lcs 23.040.20; 91.140.60; 91.140.80; 93.030

Complian@with a Bntish Standad cannot confer immunityfrom

legal obligations.
This Britjsh standard was published under the authority ofthe
Standa rds Policy and Strategy Committee on 3l May 201 1 .

Amendments issued since publiGtion

Date
(!

u
E
E

o
t!

Text affected

BS ISO 25780:2011

INTERNATIONAL
STANDARD

rso
25780
2011-05-15

Plastics piping systems for pressure and

non-pressure water supply, irrigation,
drainage or sewerage
Glass-reinforced
thermosetti ng plastics (GRP) systems
based on unsaturated polyester (UP)
resin
Pipes with flexible joints
intended to be installed using jacking
techniques

,.
.

Systdmes de canalisations en ma eres plastiques pout l'alimentation

en eau avec ou sans pression, pour l'inigation ou I'assairr'ssea,6nl
Systemes en natidres plastiques thefinodurcissables renforcds cle
Tubes
veffe (PRV) e base de rdsine de polyester non satur6 (UP)
avec assemblages llexibles desi/r6s a 6hs rrsta//6s pat les techniques

:N=

ilso=
:)v,:

ISO 25760:201 1(E)

tso

2011

l-BS ISO 25780:2011

ISO 25780:20'11(E)

Contents

Page

I
3

4
4.1
4.2
4.3

4.4
4.5
4.6
4.7

5
5.1

- c:l

5.3
5.4
5.5
5.6
5.7
6
7
7.2
7.3
7.4
7.5
7.6

Annex A (normative) Plastics piping systems

thermosetting plastics (GRP)
- Glass-reinforced
pipes
Determination ofthe longitudinal
compressive p.operties of a pipe, using
a sample ofprism test-pieces cut trom a ring from the pipe..-......,.......,......................,...,.......-.....27
Annex B (normative) Plastics piping systems
- Glass-reinforced thermosetting plastics (GRP)
pipes
Determination of t}le comprcssive properti$ oI pipes, using spool tesl-pieces .........34

Annex C (normative) Procedure foi the calculation ofthe permissible jacking Iorce on a GRPlUP)

'4.
G) ISO

2011

-Alrqhls r6eNed

BS ISO 25780:201'l

INTERNATIONAL STANDARD

ISO 25780:201,l(E)

Plastics piping systems for pressure and non-pressure water

supply, irrigation, drainage or sewerage
Glass-reinforced
plastics
(GRP) systems based on unsaturated
thermosetting
polyester (UP) resin
Pipes with flexible joints intended to be
jacking
installed using
techniques
I

Scope

This lnlernationa Standard specifies the properUes oflhe piping system and ils cornponents made from glass
reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) for water supply, lrrlgation,
drainage or sewerage sysiems with orwithout pressure.

This lntemational Standard ls applicable to GRP,UP piping sysiems, with fexible joints, jntended to be
installed using jacking techniques. ll specifies the characlerisiics of pipes made from cRP,UP, with or withoul
aggregales or fi ers and also specifies lhe test paramelers for lhe lest methods referred to in this lnternaiional
Standard.

.t

NOTE

Pipes referred to in th s lniernal oial Sta ndard are because of the r intended use requircd io have a minrmum
romina siiffness ofat easiSN 20000 (see 52 1).

ThiB lnlernational Standard is appllcable to pipes and joints with a size range irom DN1001o DN400O which
are intended to be used for the conveyance of water or sewage at iemperaiures up to 50 'C, wilh or wilhout

It covers requirements to prove the design oi the joinl and specifies type iest performance requiremenls Ior
lhe joints as a firnction of the declared nominal pressure rating of the pipeline sysiem and the required joint
deflection capabiliiy of the system.
GRP-fiilings, used between pipe systems covered by thls International Standard, shall be in accordance wiih
ISO 10639 for water supply systems or ISO 10467 for dralnage and sewerage sysiems, as applicable. n a
pipe-work system, pipes of different nominal pressure and siiffness ratings may be used together.

Normative references

The fo lowing referenced documenls are ndispensable for the applicalion of this document. For dated
references, only the ediiion ciied applles. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 75-2:2004, Plastics

ISO 604:2002, P/astics

ISO 2078 Iexi,i/e g/ass

ISO

31

@ ISO

26, P/asrbs

2011-A

Determinatian of tempercture of deflection undet

Pat12: Plastics

Detemination afconprcssive prapefties

Yarns

Designation

pblrg sysiems

rghts resetoed

laad-

P/astics comp onents

Determination af dinensions

BS ISO 25780:2011

ISO 25780:2011(E)
ISO 4633, Rubber sea/s

sewemgp pipelines
Joint ings for water supply' dminage and

Specificatian far
Determination of

plastics (GRP) pipes

ed thermosefring
lso 7685. P/asfics pipi,4g sysfems - G/ass-re'nforc
stitrness
ing
inittat specific
lso8639,G/ass-,?,,fo,rcedthermaseftingplastjcs(GRP)pjpesandflfiings_Testnethadsforleaktightness
lso10466.Piastjcspip,ngsystms_G]ass-rei,forcedthernosetljngptastics(GRP)pjpes-Testnethodto
prove lhe resstance to nihal nng deflection

non-ptPssure dral'age a'd- seweragp

lso 10467. P/astics prptrg systems lor p'essuresedand
on unsaturated potvestet (uP) rcstn

i.ir"iiiiin""iiii,tid

p/;stcs {GRP] svsrems

G/dss_

ba

1So10468'G/ass-reinforcedthernoseftingplastics(GRP)pipes_Deterninationofthelang.termspecitic
';;,
;;t condhions aid cdtcutation ar the w4 creep tactor

;;;

;;;;;;;;

";i;;;"

Datelm'naton ot th"
(GRPI pipes
ISO 10471, G/ass'/6rnforced ihplrnoseit'ng.plastics
wet condtttans
undet
nns
dettectian
iio,ni ."slet m uttimate retative

lon*tetm ulttmate

Glass-renlorcecl

'i"7iii
-.

")ii
pressure and non-pressue--wal,, suppty
rso 10639. Plaslics pipr'g slstems /or
patvestet tuPt rcsin
svstems oaseo on unsaturated
i""#JinrripiJ"t'i" idiE)

'.t:

plastics (GRP) pipes and fiftings

Glass-reinforced thernosefttng
systems
use
Methods for regressian analysts and thetr

lso 10928, Plastics p,pmg

ISO 10952, P/asncs piping srs/ems

Deterninaton

ol

the resisrr'.;"'o

ptaslics IGRPJ prpes and nftinSs

L)lass'reinforced thernosetling
in"laie d 6 sssrion in a cleflected condition

oiiit'iiiii"
"n"'''"'

Terms and definitions

terms and definitions apply'

Forlhe purposes ofthis document' the following

iianuracturer's dectareu pipe outside diameter

the soigot
e;"ernar diarneter orthe p;pe oarrel' excluding

NoTE

is expressed in millimetres (mml

Manufaciuis declared plpe ouiside diameter

3.2

jacking diameter
externalprofile ofthe pipe barrel at all cross_seclions
::lculated marimum oulside dEmeter ofthe

de= .laD

+ A+ \1)

/t

diameteri
is the plus tolerance on lhe outside

doD

diameier'
is the manufacturer's declared outside

NOTE

Jacking diameter' which

diameter and its tolerance

ls derived using the equation above' outside

are

expressed in milLrmetres (mm)

@

lso 2011 -AlLnghts rcsefled

BS ISO 25780:2011

ISO 25780:201{(E)
mean diameter

diameierofthe circle corresponding wilh the middle ofthe pipe wall cross-section

NOTE

Mean diameier is derlved using the following equation with ihe ouiside diameter and walllh ckness expEssed

is the p pe's wall lhicknessi

doD

s the manufactureis

decared outsdedlameler

3,4

internaldiameter
to
external diameter rninus twice the walllhickness,

NOTE

lntemaldameter isderived using the following qualion

NOTE

lnterna diameter, outside diameter and wall lhickness arc exprcssed in millimeires (mm)

3.5

spigotor groove diameter

d9

exiernal diameter of the spigot [see Figure 1a) diameler], or in the groove of the spigot lsee Figure 1 b)
diameter, if applicablel

NOTE

Spigotorgroove dianreter is expressed ln mllimetres (mm).

3.6

minimum crossectional area at the spigot

minimum area ofthe cross-section ofthe pipe atthe spigot, or in the groove of the spigot, ifapplicable

NOTE

l\Iinimum cross-sectional area ai ihe sp goi s der ved using the fol owing eq ualion and s expressed in square

l.

,l

,1s=tr 105 do) -(0,s ?i)3.7

buried pipeline
pipeline which is subjected to the external pressure transmitted from soil loading, including trafflc and
superimposed loads and, possibly,lhe pressure ota head ofwater

jacking
lrenchless construction method which installs a pipeline by inserting pipes one by one under the ground by
pressing with one or more hydraulic jacks, while the excavated ground is simultaneously evacualed from ihe
cutting head
3.9

nominal length
numerical designation of a pipe length, which is numericeily equal lo the laying length (3.11), when expressed
in metres (m) and rounded to the nearest whole numb-or

NOTE
@ ISO

Nominal ength is a dimenslon ess nlmber ounded to lhe nearest who e numbe..

2011-Al

nshts

reserued

BS ISO 25780:2011

ISO 2s780:201'l(E)

a)

section through a rebated unrooved spigot

b)

Sction through a rebated grooved spigot

la

u
L

c)

Crossection through sPigot

Kev
doD ouiside diameter of pipe (see 3.1)

16

jackins diameter (see 3 2)

I
dq

intemal diameter oi PiPe (see3.4)

rebated spigot or grcove diameter (see 3 5)

wallthickness oi PiPe

.4s Minimum

pipe cross-sectional area at spigot (see 3 6)

Figure I

DiameteE refened to in these definiiions

3.t0
total length

passing through the extreme end points ofthe pipe

distance-between two planes normalto the plpe axis and

NOTE
4

Totallength ls exprcssed in metres (m)

O ISO

2011-Aliqhts Berued

BS ISO 25780:2011

ISO 25780:20'11(E)

3.tl
laying length

tolal length of a pipe minus, where applicable, the manufacturcls recommended insertion deplh of the
spigot(s) in the socket

NOTE

Laying ength is expressed in millimeires (mm)

3.12

specific initial longituclinal compre$ive stress at brcak (derived from a spool test-piece)
compressive stress at break (3,46) of a spool test-piece, during a short-lerm compressive test with the testpiece loaded along ils longitudinalaxis including, ifapplicable, spigots with rebaies

NOTE

When tesied in ac@rdance wiih AnnexB, specifc iriua longitudiral comprEssive stress is exp.essed in

3.13

minimum specific initial longitudinal compressive stress at break

manufacturer's declared minimum value for the specific initial longitudinal compressive stress at break oflhe
pipe

NOTE

llinimum specifc inital ongitudlnal compessive stess at break is exprcssed in megapascais (lVPa).

3.14

initial longiludinal compressive strss at break (derived lrom rebated or un-rebated test-pieces)

.
t_

compressive stress at break of the lesl-piece durlng a shorl-term compression lest using either a rebated (r)
or unrebaied (u) teslpiece

NOTE

When tested in acco.dance wilh Annex A,

lhe

nil al long iudinal comprcssive

stEss al break is exprcssed ln

3.15

sample de-rating factor

:f.
factor correcting for the relalionship between compression test resulls obtained on full size pipes (spool
lest pieces, 3.12) and results obtained using ieslpieces with the same spigot geometry (3.14)

NOTE

Sample deting ractor s a dimensionless number

3.16

de-rated initial longitudinal compreasive stress at break

calculated compressive stress obtained from lhe test results at break using eilher un-rebated or rebated teslpieces and lhe applicable de rating factor

NOTE

Derated iniliaLlongitudina compressive slrcss

atbak

s exprcssed in megapascals (L4Pa).

3,17

initial longitudinal compressive modulus

ratio of the applied stress to the resulting strain below the elastic limit, boih measured concurrenily during a
shod-term compression lest

NOTE

When tesled ln accodance w th e iher An nex A or B the initial longitud inai comprcsslve modulus is exprcssed

in megapascals (MPa)

O ISO 2011

-AlrOhts Eeryed

BS ISO 25780:2011

ISO 25780:2011(E)
3.18

ultimate longitudinal load

jusl be'ore break
c;lculated va ue of I1e concenllic lonqiludi'la, load lnat l,re pioe wihsla.1ds

NoTE

Ulurnate longiiudinal Load is exprcssed

lr kilonewtons

(kN)

3.t9

longitudinal compressive (material) safety coef{icient

load lr.
applied to the uLtimate longitudlnal load lo determine the theoretical design iacking

ec

(3.21')

3.20

design jacking load

a jacking
nlanufacturers decLared vatue of the tongrtudinal compressive load ihat a pipe can withstand during
operation, taking into account the malerialsafety coefrcient' l'

NOTE

Deslg n

jacking oad is expressed in

lonewtons (kN)'

3.21

theoretical design iacking load

pipe can be expected io withstand
vatue ot ttre concentric tongrtudinat compressive load that the
during ajacking operaiion, taking into accountlhe materialsafety coefficient,

citiliated

NOTE

Theoretical desig

(kN)'
lacklng load is expressed n kilonewtons

3.22

permissible eccentric jacking fo.ce on the pipe

"lilrii"c

a
ot the permissible eccentric tongitudinat toad that the pipe can wilhstand. during iacking
adeflection'
angular
ihe
estimated
and
t"f.i"g i"t"r"*unt the matedalsafety c;efllcient, /(3'19),

NoTE

(kN)
Permlssibe eccent c iacklng force on ihe plpe is expressed in klonewions

"p"i"ti"",

,"tr"

permissible eccentric iacking force on the system

,iLe

rorce that the systerr can

oea",ua by Ihe pipe rnanLlaqurer ol the permissibe eccenl ic longilud nal

wittrstanO Auring'a ;acking operation, taking into account the material safely coefilcient'
angular deflection,
(kN)'
Pemiss ble eccentrlc iacking iorc on the svslenr isexprcssed in kionelvlons

and the estimated

NOTE
3.24

nominal stiffness
SN
.s^

has the same numedcal

li.n".,-".i"rr desEnation for stiffness identification purposes (see 4'2'3)' which persquare
metre (N/m2)
rn neMons
expiessed
;5il:';"Jl;e;;ffi#l;lii;i;;;#;;;".;";"a;,lue,wrren

NOTE

Norn nal stifiness

letlers SN plus a nurilber.

the
ls a dimersion ess number used for denllficaton or ma*ing purposes consisting of

o lSO

2011

-Alrohls

eserued

t_

t-

BS ISO 25780:2011

ISO 25780:20'll(E)
3.2s

specific dng stiffness

t-

s
physical characteristic of the pipe which is a measure of the resistance to ring deflection per metre length

NOTE

,Specific ing stiftness is detemired using the foltowing equaton and is exprcssed in nowtons per square

is lhe apparent modulus of elasticity which can be derived from the rcsultofthe nng sttrness lest, i.e. tSO 768s,
expressed in newions persquarc melre (N/mlj
is the mean diameter

ofthe pipe (3.3), in mets (m);

is ihe scond moment of area in lhe longitudinal dircction per metE tenglh, in metres to the fouth power per

12

- 4,":

wherce ls the wallthickness, in metres (m).

3.26

initial specifi c ring stiffness

,lb
value ofspecific ring stiffness, S, obtained when tested in accordance with tSO 7685

NOTE

lnitialspecific rirg sifiness ts exprcssed in neMons persquarc metre (N/ml.

3.27

,,
raiio of the lorg-term specific ring stiffness, S;.retatr years, to the initiat specific ring stiffness,

t-

NOTE

When tesled in accordance with tSO 10468, using susrained toading under wet condiiions, rhe tongrem
speciric ring stifiness q.wer is obiained . nd when rhrs valLre is divided by the initiat speciric ring siifiness, so, lhe wet creep
ia.lor, a. cRD d6r. is obta ned lsee "e fol,owrg equation)
"r.cEoe

wai

so

calculated long-tern specific ring stiffness

-{

So

calculated value of specific ring stiffness, S,

NOTE

atr

years

Long-term specinc ring stitrness is obhined using theiotowing equalion

s.,wel = Soxa,.re1

is lhe elapsed

d'.wd

is the wet creep facior

So

is the initialspecific rlng stiffness.

@ ISO 201

time

I - All I qhts reserved

yealsspecined in ihis tnrernationat Siandard (see4.6);

al, yealsi

i50 25780:2011
ISO 2s780:2011(E)

BS

3.29

pressune pipe
pipe having a nominal pressure (PN) (3.3f) ctassification greater than I bar and which is intended to be used
with the internal pressurc equalto or less than its nominal pressure when expressed in bars
3.30

non-plessure pipe

pipe subjected to an internal pressure not greaterihan ,l bar

3.31

nominal pnes6urc
Pt{
alphanumeric designation for pressure classification pulposes, which has a numerical value equel to lhe
resisiance ofa component of a piping syslem to inlernalpressure

NOTE

Nominal prcssurc ls a designation for rcrerence or marking purposes ihar consisis of the teltels pN ptus a
numberwhich s related lo a components pressurc rating n bals.

3.32

.>
a
a

nolmal sewice conditions

conveyance ofwater or sewage, in the temperalurc range 2'C
design

1o

50 "C, with orwithout pressure, for 50 years

se

ice temperaturc
maximum sustained lemperature, at which the system is expected lo operate continuousty

NOTE

Desgr serv ce terperaure,s expssed in deg.ees Cets us fC).

3.34

rerating factor
multiplicalion factor that quantilies lhe relation between a mechanicat, physicat or chemicat property at the
service condition compared to the respeclive value al23 "C and 50 % retalive humidity (RH)

relative ring def lection

i.L

raiio ofthe change in diameter of a pipe,t, in metres,lo iis mean diameler, dm, in metres
RelaUve rng deflection ls deived as a percenlage, o/0, i.e.:

NOTE

l_Lt.10n
3.36

minimum initial relative specific ring deflection at2 min before bore cracking occurs
initial relative specific ring deflection at 2 min which a teslpiece is required io exceed withoul bore cracking
when tesled in accordance with tSO 10466

NOTE

nimum init al relative speciftc ring deflecuon ar 2

diarrerer, i.e.
|

12.!e

in berore bore cracking occurs is expressed in % of rnean

" rnn
@ ISO

2011-Al nghb Eeryed

BS ISO 25780:2011

ISO 2578012011(E)

3-37

Vpe tast
tesls canied out in order to assess lhe ftnFss forpurpose
of a product or assembly of componenls to fulfil its
or theirfunction(s) in accordance with this lnternatk
n;t$andar;
3.38

flexibleioint
joinl which allow6 relative movemenl
betwen components being joined
3.39

flush coupling

joint componenl with either an exteanal

diameler equal to the pipe,s oulside diameter or an inside
diameter
equalto lhe pipes insjde diameter
3.40

closed

ioint

jornt condirion where rhe pipe-ends.

inirialy separated with a pressure transfer ring. are in crose
conract wirh
each other without any gap around the wh;b qrcumrerenc
3.11

open ioinl
joint condition where lhe pipe-ends
are paruy or tota y not in ctose contact wilh each other thereby
forming a
3.42

angular deflection

5
angle between the axes of lwo adjacent pipes

NOfE

Angutar deflection (see Figure 2) is expressed in degrees (.).

3.43

D
longitudinal movement of a joint

NOTE

Draw (see Figure 2) is expEssed in milimelres (mm).

3.44

total draw

T
sum ofthe draw,

NOTE
3J5

r,

and the additional longitudinal movement,

"I, due to lhe presence of angular defleclion

Totat draw (see Figure Z) is expressed in milimetros (mm).

misalignment
amount bywhich the centretines of adjacent pipes tailto
coincide

NOTE

Misatignment (see Fgure 2) is eprssed jn mi[imetrEs

\mm)

3.46

break
condition where the tesi-piece can no tonger carry
the load to which it is being subjected
@ ISO 201

I-

At, dghls

Eseed

BS ISO 25780:2011

ISO 25780:201'l(E)
3.47

pipe' creaied by the

naiive soil and the external surface of lhe
area between the bored wall formed in the
cutting head or shield ol the jacking machrne

a)

a_

.L
!L
-q
E

,.1

b)

c)

Figure 2

-Joint

movements (co'frnued)
@lSO 2011 -AlLnohtsreserued

10

BS ISO 25780:2011

ISO 25780:2011(E)

d)

"/
,

iongiludinal movementansing from angutar deflection oflhejojnt

angular deaection oi thejoint

NorE

The joint rn this

rigu

E
:
=

=
=
:

is

a n

exampre oi a typicar joint bul is not intended ro

Figure 2

fx design. orher roin6 a," avairabre.

Joinl movements

Requirements

4.'l

Classilication

Pipes shail be identified arcording to the manutacture/s

dectered pipe outside diameter, lon (see 3.1),
maximum jacking toad (see d 1.3), noFrinat stiffress (SN)
{see 3.24). nominal pressure (PN) (see 3.31) and
joint type (see 4.2.2).
Couplings for use on lhe outside ot a p,pe

sha be

identifted accor.lind 16

rh.

nomrnar.pressure (PN) and joint type. Couptings for

use on tne insiAe of a"pipe ina
Ihe pipe's internaI diameter.
(see 3.4). nomi;atpressure (pN) and joimiy'p;.

4.2

hinc iacking diameter, 1e,

ii'te idenlified according to

Pipe properties

4,2.'l

Manufacture/sdectarcddiameters

Tte.orrside diamerer of GRp pipes conforming with this lnternational

standard sha conrorm 10 the
requrrements given in Table 4 and be dasinnered.6y
the
d;"r"r"J
pip-" iri"ia"- o,rrn"t"r. ,oo
..'(see3.1, The manufacturer shal atso decb]re the iniernal.manufaclure/s
d,ameter. d (see 3.;;.

4.2.2 Maximumiackingtoad
The manufacturer shall declare the maximum t.ad
that.can be apptied to the ptpe durjng thejacking operalion,
in tonnes. The

customer shalt deiait in his enqurry the maximum toad that

is requiied
capable ol carrying durjrg the jackinq operatron.

f;r the pipe to

be

4.2.3 Nominalstiffness
Forjacking applications the pipe shallhave a nominatstiffness
(see 3.24) oral teast SN 20000.
O ISO 2011

A i rights eserved

11

BS ISO 25780:2011

ISO 25780:2011(E)

4,2.4 Nominalprssurc
The nominal pressure (PN) (see 3.31) shallconform to one ofthose given in Tabte

Where pressure ratings other than the nominal values in Table 1 are to be supplied, by agreement between
the manufacturer and the purchaser, the pressu.e marking PN on the component shati be reptaced by pNr,
where, is the number equalto the componenfs nominal pressure

4,2.5 Appearance
Both inlernal and external surfaces shalj be lree from irregu arities, which woutd impair the abitity of the
component lo conform to the requiremenls ofthis lniernationalSiandard.
Table I
Nominal pressures (PN)

(PN)
(15)
(2 5)

16

\4)

(18)

(20)

(e)

25

10

32

(12)

NOTEl

ComFonents marked

pressure @mponents (see 3 30)

NOTE

PNl are

non

Values n paentheses are non prebred

4.3

Materials

4.3.'l

General

The pipe shall be constructed using chopped and/or continuous gtass fitaments, strands or roving, mats or
fabric synthetic veils, polyesier resin with or without fillers and, ii appticabte, additives necessaryio impart
specific properties to the resin. The pipe may atso inmrporate aggregates.

4,3.2

Reinforcement

The glass used for the manufacture of the reinforcemenl shatt be ctassified as one of the lo owing types in
accordance with ISO 2078:

a) a type 'E" glass, comprising primarily either oxides

of

siticon, aluminium and catcium (atumino-

calcosilicate glass) orsilicon, aluminium and boron (alumino-borosilicale glass);

b)

a type"C" glass, comprising prjmarily oxides of silicon, sodium, potassium, catcium and boron (alkati
calcium glass with an enhanced boron trioxide conteni) which is intended for applications requiring
enhanced chemical resistance.

ln either ofthese types of glass, small amounts oi oxides of other melals will be present.

I'IOTE
so

12

2078

The descriplions for "C'glass and

E'

gtass arc conssteil with, bui more specifc

rtun

@1SO2011

those given in

nghts reseNed

l50 25780:2011
ISO 2s780:2011(E)
The reinforcement shallbe made from continuously drawn filaments ofa glass confoming to type E or type C,
and shall have a surface ireatmenl compatible with the resin to be used. ll may be used in any form, e.g. as
continuous orchopped lllaments, sirands or roving, mat orfabric.
BS

4.3.3

Resin

The resin used in the structural layer (see 4.4.2) shall have a temperature of deflection of at least 70'C when
tested ln accordance with method A of ISO 75-2:2004.

4.3.4 Aggregates

and fillers

The size of particles jn aggregates and fillers shall not exceed 1/5 of eilher total wall thickness of the pipe or
fiiting, or 2,5 mm, whichever is the lesser.

4.3,5

Elastomers

Each elastomeric material ofihe sealing component in conlact wiih ihe fluid being conveyed shall conform to
the applicable part of ISO 4633 or, if such material is not available, a similar standad that is accepiable to
both the purchaser and supplier.

.'

U.
:
:'
:
.

4.3.6 Met ls
Where exposed meialcomponents are used,lhere shall not be evidence ofcorrosion ofthe components after
the fitting has been immersed in an aqueous sodium chloride solution, 30 g/1, for seven days a1(2312) 'C.

4.4

Pipe wall construction

4.4.'l

Inner layea

The inner layer shall comprise one oflhe following:

a)

b)

a thermosetling resin layer with or wilhout aggregates or fillers and with orwithout reinforcemenl of glass
or synthelic lilaments;
a thermoplastics liner.

The resin used in this inner layer need nol conform to the temperature of deflection requilements given in
4.3.3.

4.4.2 Structurallayer
The structural layer shall consisi of glass relnforcemeni and a thermosetting resin, with or witholt aggregates

orfillerc.

4.4.3 Ouler layer

The construction oI ihe outer layer of the pipe shall take into account the environment in which the pipe is io
be used. This layer shail be formed of a thermosetting resin with or without aggregates and tillers and with or
without a reinforcement made of glass or synihetic filaments. The resin used in this outer layer need not
conform 10 the lemperaiure ofdeileclion requirements in 4.3.3.

NOTE

When seiecting or specirying the pipe for use, ensurc lhai lhe prevailing native soll condilions and lhe
lubrication mate als, such as benton le ges, proposed ior use by the pipe jacking conkactor ale suiiabLe and wil nol
aifect the perfomance ofthe pipe
@ ISO

2011

-Alrghts

reserued

,t3

BS ISO 25780r2011

lso 25780:2011(E)

4.5

Reference condition6 for te6ting

4.5.1 Temperature
The mechanical, physical and chemical propedles specfied in this lnternational Slandard shall, unless
otherwise specifled, be determ ned at (23

5) "C.

For service temperatures over 35'C, type tests (see 3.43) shal be carried out at least at the design service
ternperature (see 3.33) to establish rerating factors (see 3.34) for all longierm properlies of relevance to lhe
design of pipes.

4.5,2 Properties

of water for testing

The water used for tests referred to in this lnternationalSiandard shall be tap water having a pH of

712.

4.5.3 Loadingconditions
Unless otheMise specified, the mechanical, physical and chemical properties specified in

ths

nternational

Slandard shall be determined using circumferential and/or longitudira loading conditions as applicable.

4,5.4

Preconditioning

llnless otherwjse specified, n case(s) oI d spute, slore the iesl-piece(s) in air at the test temperature specifled
in 4.5.1 for al least 24 h priorto testing.

4.5.5

lvleasurement of dimensions

ln cases of dispute, determine the dimensions of GRP components at ihe temperalure specifed in 4.5.1.
lvlake al measurements ln accordance with ISO 3126 or using any other method of sufficlenl accuracy to
determine conformlly or nonconformity with the appllcable limlts. I\,4ake all routire measurements at the
preva ing temperature or, lf lhe manufactu rer prefers, at the tem perature speciied in 4.5.

. 4.6 Elapsed time, r, for determination

1 .

oI long-lerm propedies

s, wer (see 3.27 and 3 28) denotes the tlme al which the long{erm property is
to be determined. Uness otheMise specifed, the long-term properties shalbe determined at 50 years
The subscript, in, for example,
(438 000 h).

4.7

Joint propedies

4.7.1

General

The manLrfacturer sha I declare the length LC, and ihe maxir.um external diameter DEC of the assernbled
loint.

4.7.2

Types

ofjoint

The joint shall be classlfied as fexible (see 3.38). Use rebated spigots able lo accommodate flush coup ings
(see 3.45). Rebated spigots may be grooved to house the elastomeric sea s.

4.7.3 Flexibility olthe jointing system

4.7.3.1

Allowableangulardeflection

The manufacturer shall declare the maximum alowable anguar defleciion between adjacent plpes n the
insla led condilion which shall not be less lhan lhe applicable va ue qiven in Table 2. The manufacturer shall

14

so 2011-Al rshts eserued

BS ISO 25780:2011

ISO 2s780:2011(E)

(see 3.42), at which each joint is designed to

operate when subjecled to either inlernal or external pressure, as appropriate, and the value shall not be less
than the applicable value in Table 2.
also declare the maximum ailowable angular defleciion,

The manufaclurer shell declare lhe maximum allowable angular deflecijon permitted during pipe jacking

4.7.3.2

Allowable draw

The manufacturer shalldeclare the allowable draw, D (see 3.43), forwhich eachjoint is designed.

:-

n
a)

Example

ofa pipe connection using a rebated un-grooved spigot and flush coupling

,_

b)

Example

ofa pipe connection using a rcbated grooved spigotand flush coupling

a
doD external dianreier

(see

31)

dj
ds

inlernal diameter (see 3.4)

,i
:/
c
Iq

rebaled lenglh, oeressed n mil metrcs (mm)

o.starce or he groove io spigol erd. exossed in mittreres (nm,
pipe wallth ckness (see 3.3)

extemaldiameler oflhe rebated spigoto.ii thegrcove, i appticabte (see 3.5)

DEC e(emal diameter of the fush coupling (see 3.39) expressed ii mittimetres (mm)
LC lenglh oicoupling, expressed in millimetres (mm)

thickness oithe sma resl section underthe groove, expressed nmilimets(mm)

Figure 3
@

rso 20ll -Alrghts reseeed

Exampl$ of a pipe connection

15

BS l5O 25780:2011

ISO 25780:20'll(E)
Table 2

-Maximum

allowable installed defleclion ofpipeioints

dao <2ao

20

200 < doD < 500

15

0,8594

500<doD<1000

10

0,572I

\v

Kv

,
a

llaximum ansular deflection 0 in desrces (').

lvaximum ang ular deflection in millimeires per metE (mm/m).

Figure 4

E
E

10,1!!9

&

t0-

54

4.7.4 Sealing

Joint deflection

ng

The sealing ring shall nol have any detrimenlal effect on the properties of the components wiih which it is
used and sialliot cause the test aasembly to faillhe perfolmance requirements specified in Clause 7 oflhis
International Standard.

4.7.5

Effect on waterquality

When the pipes are intended to be used for lhe conveyance of water intended for human consumplion
attention ii irawn to the need for components to comply with any national regulatiohs on the quality of
drinking water in force atthe location where the components are to be used.

Pipes
5.1

Geometrical charactedstics

5.1.1 Jacking diameter

Pipes mnforming with this lntemational Standad have their d;ameter classifed by their manufacturefs
declared pipe ouitside diameter, doD (see 3.1)- Because the oulside diameter of a jacking pipe needs to be

compaliblewiththejackingmachinery,theactualoutsidediameterofapipeconformingtothistnternational
Standard shallbe agreed between the pulchaserand the manufacturer.

't6

@1So2011 Al dshts esetoed

BS ISO 25780:2011

tSO

2s780:2011(E)
The Jacktng drameter.,,/e (see 3.2). is tne calculaled
maxirnum outside diameter of the externat profite
prpe barreiat allcross sedons catculateo
of ihe
using Lquation (,).
de

doo

+t+

(1)

,,1+ is the plus tolerence on the outside diameter;

loD

is ihe manufacturer's declared pipe outside

diameter.

Theiacking diameter sha[ be compatibte with

the sjze of the hole bored by the pipe jacking machinery
during
NOTE

Jacking diameter, outside diameierand jts toterance arc

exprcssed rn milimets (mm).

NOTE 2

There is no additionat toterance on the aged

tacking diameter do, derivd from Equarion

(t) for any diameteE.

5.1.2 Waltthickness

=
,:

The manufacturer shall dectare the mrnimrJm totaj

wa thickness, (see 3.3), and the minimum spigoi
th,ckness.4s.(see hsure 3). rhe measured wa, rh;k""ii'"i"iv
p"iriir iipJ,,i,i,lpffo.i Jillrr'lo, o" ,""",r,",
me manutacture/s slated vatues

5.1.3 Nomina ength

Unless otheMise agreed between the manufaclurer
and the purchaser, lhe nominal length (see 3.9) shall be
one of the following values:

'1,2.3.4 ot 6

5.1.4 Laying tength

prpe shall be supptied in laying rengths.

/ tsee 3.11). in accordance witF ihe requirements grven in
]^h,:
the
Iorrowrng paragraph. The toterance on erl;cttve
tayjng,"ngtl,,"

60.;.''

Of the totat number of pjpes supptied in each diameter

the manuiacturer may sLppry up ro .t0 % in taying
-"gr""o
lenglhs shorler than the nominat tenorh unrFsq
a higher percentage of suct p,je" fiJs'oeln
o"t*""n
lhe manufaclurer and purchaser. ln;,t c-sFq where
tne rayrng te"ngrn
I"-#ir",i'n", oo ,,n 1,"
nominatrensth, the actua, tayins tenslh otrhe pipe
sr,"rr o" ,ii"ir"i
"i-r,".ri*
"r

J"il iri"]'* - --,,

5.1.5 Straightness
For ppes with a taying tength, / (see 3.11), up
to 6 m, the deviation from straighl of a surface tine shal
not

exceed the velues oven in Tabte 3

Table 3

Maximum permissible deviation

froft straightness

Dlmensions in mitlimeires

iranufacture/s decrared

Oeviation f rom st.atghtness,

d6s < 550

550<doD<960
3

olSO20l l -At

nghts eseNed

17

BS l5O 25780:2011

ISO 25780:2011(E)
Straightness for pipes with a nominallength longerlhan 6 m shallbe agreed between manuiacturer and client.
Due to end effecls, when checking a pipe's slraightness, measure a length noi less than the laying length, 1
(see 3.11), less 50 mm. Ivleasure the deviation as the maximum distance between a calibrated lath, with the
same lenglh as the pipe, and the extemal or internal pipe surface.

5.1.6 Squareness ofend faces

The deviation from squareness across a joinl's extemal diameter dsq d (see Figure 5), shall not exceed lhe
values given in Table 4.

Table

4-

Permissible deviation frcm squareness acrcss ajoint's exte.nal diametr

Dimens ons n

m limetes

Manufacture/s declared

Deviation of squareness

./oo < 300

05
10

The permissibe devialion from squareness across a joint's wall thickness,

reation to 90" for all pipe d amerers and wall lhick nesses.

Figure 5

dsq e (see Figure 6),

is

1"

in

Deviatioh from squareness across ajoint's e)dernal diameter

@

so 2011-Al rights resetoed

BS ISO 25780:2011

ISO 25780:2011(E)

Figure 6

5.2
.-

a,

Deviation from squareness across ajoinfs walllhickness

Mechanical characterislics

5.2.1 lnitialspecific ring stjftness

Forjackjng applicetjons the pipe shalt have a nominat stjffness of at leasi SN 20000.

NOTE

Bigher st ffnesses may be requ ired for a pa(icu ar apptication.

The manufacturer shatt determ,ne the rliliat specific ring sliffness by testing the product in
accordance with
tesl methods retefieo to in tSO 10467 or tSO 10639. ai appropriati. Periorm the test using
a relative ring
defleclion (see 3.35) catcutated using Equation (2).

Relatve defleclion

\%l

- '

. roo =

s,a

(2)

-!L
slr

is the nominalstiffness (see 3.24);

,SN

100

t1m

is rne .etative

derlectio. in Dercenl for lhe iniliat speofic r1g sti.fness tesr.

The value determined ror the rnrtiat specific ring siifJness,,to, shall not be tess than the
nominat stiffness

5.2.2

Long-term specific creep stiffness

Ttle manufacturer shall determine the minimum long-lerm specmc creep slffness, S.
by eitner
-".",rn,
iesting the product in accordance with tesl methods referred ro in rso r04b7 or rso ioosu'i3
appropriate or
by similar tesiing of product comptying wilh tSO 10467 or tSO 10639 having a wall structure that gives
equivalent or higherstrain in areas of simirar materialcomposition, when subjecGd to diametricar
deflection.
The manufaclurer shall determine the minjmum long-term specific creep stiffness,.r,.,"""
nn, of the pipe
tnat. tnctudes rhe creep factor. aoenvea .rom tesrs pe'rfo"r'ni3d on tesr-preces
*u,,
::ll9_E-qu1,r,olt3).
ravrng a waI structLre lfat is the sarne as the oipe intended"="0.
to be used in jacktng inslallalions.

S,

we1

oeep mtn = Jo x

a,

wei

cep

(3)

where,lo is the measured iniiialspecific ring stiffness ofthe test piece (see 3.26).
The value delermined shallbe declared bythe manufacturer.
@1SO2011 AtrohisrGerued

't9

BS ISO 25780:2011

ISO 2s780:20'11(E)
5.2.3 lnitial resistance tofailurc in a deflected condition
The manufacturcr shalldetermine the resislance to failure in a dellecled condition by eithertesting the product
in accordance wilh iest methods referred to in ISO 10467 or ISO 10639, as appropriate, or by similar tesiing of
products complyinq with ISO 10467 or ISO 10639 having a wall structure thai gives equivalent or higher strain
in areas of similar materialcomposilion, when subjected 10 diametricaldeflection.
Calculate the required minimum initial relative specific ring deflection before bore cracking, /2, bore/dm, using
Equation (4).

191
1
,1se =
.Jso
I ,i. l_"

(.,:.u*"

0/,

h6F/dm)m,n

so
,:'

ll-

5.3

(4)

x 100 ls the required minimum 2 minule initial relative specific ring delleclion calculated
for the nominalstiffness ofthe test_piece, expressed in percenl (%)
is the measu red inilial specific ring stiffness of the test_piece (see 3.26).

RGsigtance to strain corrosion

Forpipesintendedtobeusedforsepticsewercortheconveyanceofcorrosiveeffluents,themanufacturer
shali ;etermine lhe resistance to slrain corrosion by either testing the produci in accordance with
requirements and test methods rcfered to in ISO 10467 or by similar lesting of products complying wilh
tso to+oz traving a wall structure that gives equivalent or higher slrain in areas of similar malerial
composition, when subjected io diamelrical defleclion in a corrosive environment.

ta

5,4

Longitudinal compressive strength

5.4.1

()
L'

General

The manufaciurer shall declare the minimum specific initial longitudinalcompressive stress at break, dbs mn
(see 3,'13). Detemine from routine quality control tests, performed in acmrdance wilh Annex A, the de-raled
initial longitudinal comprcssive stress at break (see 3.16) of both the pipe barrel' dbd,bareL, and the pipe
spigot, dbdspgot, and declale the resull.
The lest resulls ofthe compressive properties obiained from grooved lest_pieces or test spools may be used
10 determine the compressive paoperties of pipes wilh non grooved spigots.

5.4.2 Specific initial longitudinal compiessive stress al beak

For initial type tesl (lTT test) purposes, determine the specific inilial longitudinal compressive stress al break,
db s (see 3. 1 2), by cenlral load ing, using the p.ocedure described in Annex B.

5.4.3 Test-piecede-ratingfuctor,4
To calculate the test.piece de-raiing factor,4, determine the initial longitudinal compressive stress at bleak'
o^. (see 3.14), according to 5.4.4 on a sample of five rebaled test'pieces made out ol the same pipe and
wiltr ttre same spgot typ; as lhe test-piece for the speciic longitudinal initial compressive stress at break,
db s (see

3.

2). Calculale the lest-piece de-rating

faclor,t, using Equation (5).

Failure slress usinq pipe test-piece

Failure stress using rebated test-piece ob r

20

(5)

@1SO2011 Alrghls Betoed

85 l5O 25780:2011
ISO 25780:2011(E)

5.4.4 lnitial longitudinal compressive strss

at break

Deiermine the inilial longitud;nal mmpressive stress al break on both rebated db,r and un-rebated db
pieces (see 3.14) using lhe melhod given in Annex A. The test-pieces shall confonn to A.3.

tes!

Periorm an lTT iesl on rebated leslpieces.

Routine quality conirol iests shall be performed on either rebated or un-rebaled iest_pieces.

5.4.5

Derated initial longitudinal compressive skess at break

5.4.5.'l

General

Derated initial longiludinal compressive stress (see 3.16) values shall be calculated for all results obtained
from routine qualily control tesis,

5.4.5.2 Pipespigotstrength
Calculate the derated compressive stress of the spigot, ('b,d,spgoi by derating the un-rebaied tesi_resulis
using Equation (6).
.,bd

sp

5.4.5.3

qot =

ls xab

(6)

Pipebarrelstrength

Calculate the derated compressive slress of the barrel, db,

using Equation (7).

d,

baret, by deraling the un-rebated test resulls

db.d.baret=Axobu

(7)

5.4.6 Requirements

5.4.6.1

Declared value

The specific initial longitudinal compressive stress at break, ab. s (see 5.4.2), obtained from the ITT lests shall
be higher than the declared minimum specific initial longiludinal compTesslve slress at break db,s,min
(see 5.4.1).

5.4.6.2

Qualitycontrol

Both derated inilial longitudinal comprcssive slresses at break ('b. d. soiao1 and db d, badet (see 5 4.5) of all
quality controllests shall be higher ihan the minimum inlial longitudinal cbmpressive stress at break db, s. min
(see 5.4-1).

5.5

Permissible jacking forces

5.5.1

General

Calculate ihe perm issible jacking forces which can be applied lo a pipe during the jacking opetion, using the
following procedure which is based on lhe methods described in Annex C.

NOTE
o

The arca,,.1s in lhe following equations is ihat oi the iolnl surface in compressioi and rotthatof anv pressurc

so 2011-Al nohts resetoed

2'l

BS ISO 25780:2011

ISO 25780:2011(E)

5.5.2

Ultimate longitudinal load,

-Eurt

Equation (8)'
The pipe's ullimate longitudinal load, ?ut (see 3 18), shall be calculated using
Futt = db,s,min

(8)

x's

d.^-,-lsihedeclaredmlnimumspeciilciniiialcompressivesiressatbreak(see5'4"1)'expressedin
" " "' megapascals (MPa)
,s l1e mirimJn p'pe cross-seclonal area althe soigol (see

A.

J6a1d Figu'e1l' erprcssed

square millimetres (mm2).

5.5.3 Manufacture/s declared jacking load forwhich

eccentric jacking forces,

Fperm,p

a pipe is designed, rj@b, and the

pemissible

and /pe,m,s

Using ihe appropriate procedures described below and in Annex C:

load fie prpe car

er
the theorelical des'qn iacking load. / .: - lsee 3.21,. wlich rs the maximum
'' Caldrlare
ns
odt"i.n. ,!ing equbt6; (9) whicn assumes thal ihe iaci load is concenric
iii,",""o lr,
joirt faces perlectly sqLare)'

"g;'r""ki"g
r io tne joinl iaces ii.e. no deflecl'ol a1d
ana perpe ra.cut'a

t|erc

(e)

in new'tons (N);
is the ultimaie longiiudinal load obtained from Equation (8), expressed

6 rne maler.al's sa'ety'ac1or ln lo.1gludira co'npressiol

The safely factor,

shall not be less than 1,75' unless specific

ag

reement iustifles the use of a lower value'

jacking load for which each iacking pipe was designed.ldesign jacking load'
The manufacturer
-""-a shall declare the
@J derived from
n6t o" gi""t", tt rn ihe theor;tical design iacking load
ir,r r;a
iioif

(l

i'Gi"

"h"n

Equation (9)

accordance wilh Annexc and

The design iacklng load as declared bv lhe ppe manufa'lurer s calculaied n
jacrrns
method and subsequenr
or
the
r:ctor io be used bv ihe ;niEctor to rare accounr
,"1,;"
theiackins face (see
rario
across
srress
orfor
rhe
condirions,
irnforeseen
ano
ijiir,l-" p,p;". m;;,ai:ie orgrouro

NOTE

;;;;.t

o"n""iii"

;il":f"t

Flqure C.1).

lhe esl'rraled

b)
-'

CalcJlate tne pern ssibe eccenl

c)

(see 3'23)' taking into accounl

Calculate the permissible eccentric iacking iorce on the syslem, Fpem s
matters such as the following:

c iacking force 01 the

pipe,. / o'a p
!:":,: 1'z-i ,:-tii^g
force on the pipe
angrtar oef,eciiol. d The 'rla.1ulaclurer sh;ll declare the pemissi-5'e 6ccemic lacling
and the assumed angular deflecUon.

permissible jacklng force on the pipe' lperm' p'

the specifed anqular deflections du.ing installation, the
nq'orce:
applied
rack
the eileclve eccentricily o'lhe
the acceptable angular deflecuon ir the coupling (see 4 7'3'1);
the available overcul (see 3.47) ln the curved borc'

jacking force on the system and ihe assumptions

The manufaciurer shall declare the pemissible eccentric
made in the calculations wiih reqard to the above matters
22

@lSO 2011- Al nghts reseNed

BS ISO 25780:2011

ISO 25780:20{1(E)

5.6

Specitic initial longitudinal compressive modulus, tqm

l.Jslng the method descdbed in Annex A, determine the specific initial longitudinal compressive modulus, Ecm

(see 3.17), by perlonning ITT and quality conlroltests.

The manufaciurer shall declare the value of /icn,

5.7

Resislance of pressure pipes to internal pressure

Pressure pipes (see 3.29) conforming to this lnternational Slandard are non-end-load-bearlng as they are
assembled using non end load bearingjoinls (see7.'l).
The manufaclurer shall determine lhe resistance of pressure pipes to inlernal pressure by either testing the
producl in accordance with tesl methods referred lo in ISO 10467 or ISO 10639 as appropriaie, or by similar
testing of products complying with ISO 10467 or ISO 10639 having a wall structurc that gives equivalent or
higher sirain in areas ofsimrlar malerialcomposition when subjecled to internalpressure,

Marking

delails shallbe printed or formed directly on the pipe or coupling in such a way thallhe marking does
noi initiate cracks or othertypes offailure.
I\,4arking

lvlarking on couplings is only required when delivered to the building site separately from the pipes.

lf printing is used, the colour of the printed information shall differ from ihe basic colou ng ofthe produci and
lhe printing shall be such ihat the marking is readable without magnification.
The following marking shallbe on the outside ofeach pipe:

a)
b)

ihe number ofthis lnternational Slandardi

ihe manufacture/s declared pipe extemaldlameter, /oD;

c) the nomlnalstiffness rating (SN)i

d) the nominalpressure raling (PN);
e) perm issible jacking load;
l) for pipes and couplings inlended forthe conveyance ofsurface water or sewage, the code-letler'C';
g) for pipes and couplings iniended for the conveyance ofdrinking water, the code-letter "P"i
h) the manufacturer's name or ideniification;
i) the date ofmanufactlre, in plain text or code.

Joint performance

7.1

Genelrequirements

Pipes mnforming wth this lnternatjonal Siandard shall be joined using flexible non-end-load-beaaing ioints
(see 3.38)with elastomeric seals.
@ SO 2011

- Al

nghts

re*toed

BS ISO 257a0:2011

ISO 25780:2011(E)
Flexible joints shall be tested using ieslpleces coniorming to 7.6.2. To prove conformity to the .equircments
for performance under internal or exlernal hydroslatic pressure detailed in 7,5, use the applicable method of
iest detailed in ISO 8639, in conjunction wiih specific conditions dependent upon ihe nominal pressure (PN) of
the piping system in which the padicular type ofjoinl is to be used. Speciilc values of PN are given in 4.2.5.

7.2

lnterchangeability

Where interchangeability between products from dlffercnt suppliers is required, ihe purchaser shall ensure
that the pipe and iitting dimensions are compatible with lhe componenis to bejoined and that the perfomance

ofthejoint conforms

7.3

1o

the relevant performance requirements in Clause 7.

Geometricalcharacteristics

Use onlyflush couplings (see 3.39) in trench ess construclion sysierns

Record all dimensions which may influence the per{omance ofthe joinls being tested (see Figures A.1 and 8.1).

7.4

Design

7.4.1 Designrequirements
A joinl made between pipes conforrning to Clause 5 shall be designed so that its performance is equal to or
betler lhan the requirements ofthe plpinq system, but noi necessarily of lhe components being ioined.

7.4,2 Designparameters

(see 3.43 and Figure 2), toial draw,

For each design ofjoint, the maximum a lowable values of the draw,
(see 3.44 and Figure 2), and angular deflection, (see 3.42 and Figure 2) for which the joint has been
desgned to b used both during ihe jacking operation and in the installed condition, shall be declared by the

manufactureT

7.5

Performance rcquirements

7.5.1

General

A joint made for connecting pipes intended to be used lnjacking techniques shal be designed to withstand the
external forces and condilions applied du ng ihe installation operations; it shall also provide adequate sealing

against bolh intemai and exernal hydrau ic forces which may occur during both ihe installation process and
the subsequent operating life oflhe plpeline.

lf the joint has been designed to be used with

pressure transfer rlngs (packerc), perform the lests on

assemblies incorporating lhe pressure transfer ring (see also nole to C.1 in Annex C).
Failure at lhe end closures during any ofthe following lests shali not constitute Iailure ol the 1est.

7.5.2 Leak-tightness when subjected

to an extemal prcssure differential

When lhejoint is subjecled to either the manufacturer's declared angular deflecion, , (see 7.4.2), or declared
allowable draw,
(see 7.4.2), i1 Bhall not show any vlsible signs of damage to ils components nor exhibit a

change ln pressure greater than 0,08 bar/h (0,008 MPalh), when tested by the appropriate method glven in
ISO 8639 atthe pressure given in Table 5.

24

@ ISO

2011

-Alrqhts.esetoed

l50 25780:2011
tSO 25780:20,fi(E)
Leak-tightness when subjected to inte.nat positive pressure foIowing assembty
BS

7.5.3

When assembled in accordance wilh ihe pipe manufaciurer's recomrnendations, the jolni shal wilhstand
without leakage an internal pressure of l5xPNbarfor15mn and shalt subsequenfly conform to 75.2,

7-54-755and756
7.5.4 Leak-tightness when simultaneously subjected

to angular deflection and draw

When the joint is subjected io the marufacturer's declared maximum alowabie angutar dellection in
accordance with 7 4.2 and a total draw, I, equa to the manufaclurer's declared maximum allowabe draw ,
(see 7.4.2), plus the ongit!d nal movement, (see 3.44 and Figure2), resulting from application of ihe
"/
manufacturer's declared allowable anguar deflecion, it shal not show any visibe signs of damage to its
componenis nor leak when lested by the appropiate method gven n lSO8639 atthe pressure given rn
Table 5

7.5.5 Leak-tightness when simultaneously subjecled to misatignment

and draw understatic pressure

When the joint s subjecied to the manufacturels deca.ed maximum altowabe draw, D(see7.4.2),afta
toial force, F, of 20 N per millmelre of the internat diameter, d, expressed in mil metres (see 3.4), ii sha not
show any vislble sign of damage to its components nor eak when iested by the appropriate melhod g ven in
ISO 8639 al the pressure given in Table 5.

.e

7.5.6 Leak-tightness testwhen subjected to misatignment

and draw under a pos,tive cycjic pressure

joirt is subjected io the manufacturers declared maxmum atowabie draw, D lsee 7 .4.2), ard a
r, of20N per millimetre ofthe nlernaldameter, d, expressed n mittimetres (see 3.4), it shat not
show any vsible sign of damage to ls components nor leak when tested by ihe appropriate meihod glven in
When the

totalforce,

SO 8639 ai the postive cyclic pressLrre given in Table 5.

Table 5

nitia leaktighiness lesl

Summary of test requirements for flexiblejoints

lnil al positve pressure

(lSO 8639:2000 72)

Exlernal pressurc d fferentia

(rso 8639 2000

-0

7.31

15,PN

15 mir

(-0

th

8 bar

08 il4Pa)

M sa lgnmerland draw understalc

Pressurc (lSO 8639:2000 7 5)

Pos tive stat c pressure

20iPN

lllisalignment and draw urder cyclic

pressure (LSO 8639:2000, 7.6)

Posive cycl c pressur

Almospherctol5xPN

24h

and back to almospheric

Angulardefleclon and draw

(lSO 863912000 7 4)

Reative to atmospheric pressure

7.6

Positive stat c pressure

ie

appror fiate y

20!PN

2 bar (0,02 Mpa) abso ute

Test method additional information

7.6.1 Numbr oftest-pieces fortype test purposes

The number ofjoint assemblies to be lested ior each test sha I be one Nowever, the same assemby may be
used for more lhan one ofthe tesls.
O

SO

2011 Al

rights reseryed

25

BS ISO 25780:2011

ISO 25780:2011(E)

7.6.2 Test-pieces
A test-piece shall comprise a joint and two pieces of pipe such that the effective laying length, /, is not less
than the applicable value given in Table f5 of ISO 10467:2004 or ISO 10639:2004 or that which is requhed to
meet the requirements of the test method.

lf the joint has been designed to be used with pressure lransfe. dng6 (packers), perform the tests on an
assembly comprising two pieces of pipe and a joint incorporating the pressure transfer ring (see also the note
in C.1).

.;,

>
&
x.

E
E

l!
@ ISO 201 1

All dqhb

BeNed

Bs ISO 25780:2011

ISO 25780:20'11(E)

Annex A
(normative)

Plastics piping systems

Glass-reinforced thermosefting
-Determination
plastics (GRP) pipes
of the longitudinal
compressive properties of a pipe, using a sample
of prism test-pieces cut from a ring from the pipe
A.'l Scope
This annex specifres the method lor detemining the inilial longitudinal compressive properlies of pipes
measured on a sample of prism shaped test-pieces haviag reclangular cross sections produced from pieces
cul frorn g ass-reinforced lhermosetting plastics (GRP) pipes inlended for use in inslallalions using trenchless
construclion lechniques.
This melhod can be used for:

rebated teslpieces to delernine the test-plece de-rating

faclor,^;

the determinailon ofthe speciflc lniUallongitudinalcompressive modulus, Ecm,

the determinaion ofthe initial longitudinal compresslve siress ai break, l'b,r or ob,!
the determinailon ofthe iniUallongitudinalcompressive modulus

m.

A.2 General
A test-piece taken fronr the pipe wall is compressed, at a uniform rale of strain in the direction parale to ihe
ongitudinal axis of the pipe, untilfailure occurs
The procedure used shall conform

to

SO 604:2002 and in add tion include the following practices:

the initial longtudinaL compressive stress at break for rebated teslpieces, db,r or db,u, for un-Iebated
test-pieces, is lhe average value ofthe results of compresson tests on a sample of live test-pieces;

the specfic initial longitudina compressive modulus, rcm, and ihe inltial longitudina compressive
modulus, fc.m, shall be measured on un-rebated teslpieces as specified in A.6.4.

NOTE

The expression of compressive prope{es in tems of the m inimum origina cross seciion is a most a universal
practice. Under some crcumstances the coriprcsslve prcpedles have been exprcssed per unit of pEva ling cross_seclon.
These propedies are called true' compress ve properl es

A,3 Test-pieces
A,3.1 General
-his claLse replaces

C aJse 6

o'lSO 604:2002.

A.3.2 Geometry
The rnelhod can be applled 1o both rebated and un rebated lest-pieces.
@ ISO 20'l

I -Alrghts Eeryed

27

l50 25780:2011
ISO 25780:2011(E)

BS

a)

.>

Rebated and grooved test-piece

b)

Rebated test-piece

o_

4
I
E
E
E
(,)

IL

c)

un-rcbated test-piece

Kev

Z
Yr

height ofteslpiece, o,Aressed in millimehes (mm)

rebated length, expEssed in mill'n eues (mm)

e total wall thickness ofpipe banel, expressed in millimets (mm)

Is'(nm)
thickness of lhe pipe barl at either ihe lhinnost section of ihe rebate or under ihe grco!,
,r/

widlh oftest-piece, sxpressed in millimets (mm)

Figure A.'l
28

expressed in mittimenes

Geomelry of pfism test-pieces

@1SO2011

-Allnghb resred

l50 25780:2011
ISO 25780:2011(E)

BS

A,3.3 Dimensions

A.3.3.1 Slendemess
Tesi-pieces shall be of such dimensions that their slenderness ratio, ,RsL, calculated using Equation (A.1) is in
the range from 510 '16.

"LL
^*
t

xsr

(A.1)

o'zsr(/rl

is the slenderness ratio;

is the mdius ofgyration.

ln the case of un rebated test pieces, ?s = e (see Figure 4.1).

NOTE

The senderness ratio RsL is the latio of the length

,:;

ofa

column oi unifonn cross-seciion to ils least lad us of

(A.2)

"o=17

lr"l

(A.3)

'12

t=wlr)

(A.4)

Hence
= o,2ss

7(re)

(A.5)

is the second momeni ofarea in the longitudinal direclion per millimetre of lenglh, expressed in
millimetres to the fourth power per milllmetre (mma/mm);

is the area of ihe smallest section under the groove, expressed in millimelres to the semnd
power (mm2);

I,,

and

ls

are dimensions see Figure A 1.

A.3.3.2 Dimensions for

rebated test-pieces

The length ofihe test-pieces, 1,, shall be noi less than lhe value calculated using Equation (A.6) subjecl lo the
tolerances calculated using Equation (A.7).

Z>(x1+10)t3mm
Tolerance limits:
O ISO 2011

-Alrgha

tA+slr)<

rseryed

(A.6)
L<

t,azt(rn)

(A.7)
2E

BS ISO 25780:2011

ISO 25780:2011(E)
(A'8) subject to the
The widih ofthe teslpieces, Ir', shall noi be less than the value calculaled using Equation
(A.9)
tolerances calculated using Equation

> (4012) mm

tr

> L 14,624

(A.8)

and
(A.9)

A.3.3.3 Recommended dimension3 for

un_rebated testpieces

The length of ihe test-pieces, /-, shall not be less than the applicable value given in Table A 1 depending on
the pipe's wall th ickness, ..
Table A

l-

Length of test_Pieces
L

60+3
1A

b <22
9013

22la <26

110r3

1:

The widih ofthe teslpieces, ,i', shall be (40

A.3.4 Production oflhe sample

t2)

mm.

wth lhe appliclble

Form the samole of iesl_pieces bv cuttrng a pipe nng wlhrrerght' / ' inlo pFces comDly'ng
pipe
ot
lhe
the
iudinal
ax's
para,.el
long
in
ls
to
im
ension
/
4.3.3. D
drmensions specrfieo
pre'erably at the p'pe end.
Rinos for un-rebated resl-pieces may be cLt anywhere alo'lg lhe oipe lenglh but
Ersure thal pioe ring axes a-e
pioe.
end
of
rhe
fro.n
lhe
spigol
to, ietareo test p.eces shal 6e cut

iinii

parallelto ihe axis ofthe PiPe.

When preparing the teslpjeces, ensure that cut sides aIe paaallel to each other and at right angLes to the cut
surfaces of the ng from which they are cut.

A.3.5 Number of tesi-Pieces in lhe sample

A sample consists of five tesfpieces made from the same pipe ring.

A.3.6 Conditioning
Unless otherwise specilied, store the leslpieces for at least 0,5 h at the iesttemperature

p ollotesting

ln cases of dispute, condilion teslpieces ior 24 h at (2313) 'C before tesiing, or subject them to a mutually
agreed test conditloning schedule.

A.4 Test equipment

Test equipment shallconform to the applicable requiremenls ofClause 5 of ISO 604:2002'

30

@lso2o11 Alrshtseserued

BS ISO 25780:2011

ISO 2s780:2011(E)

A.5 Test procedure

A.5.1 General
T,he lest pJocedure shati generaly conform to the appropriate method
specifled

Ine toIowtnq requirements.

in tSO 604:2002, except for

A.5.2 Measurements
I-or each tesr-piece, measure and record to an accuracy of to,2 mm a[ the exrerna] dimensions
indicated in
Figure A.1.

The measuring devices used

sha

compty with the applicable requirements of Clause 5 of tSO 004:2002.

A.5.3 Compressive toading

q:q ,. shal be apptied lo each test.piece as described in tso

1:lTp':-":lr"
/r snarr be recorded as a function of the change in length,

604:2002. The change of toad,

AZ, untilfraclure occurs when r.=

tti (seiA.6.3).

A.5.4 Testing speed

Apply the compresstve load using a cross head movement speed belween 0,8 mm/min end
6 mm/min.

iso 604:2002 sets indicetive teslin-g speed varues of I mm/min for modurus measurement and 5 mm/min for
strength neasu.ement. As bolh oftiese cororess,ve parartelers a,e measu,ed ouring tne;ame
lesl, end as
exper ence does rot n-dicale any fuldarrental irflLence fton i^e rest speed on thelesull.
a tesl,ng speed
oeMeen lhe values in ISO 604 2002. incuorng loterances. is aopropr.ate fo.lhe test.

A.6 Calculaiion and expression of results

A,6.'l cener.l
The procedures used for the cajculation and expression of resulls shall conform

lo the

appticable

requirements of Clause 10 of tSO 604j2002, except ior ihe properties determineO in accoiAance
wirn a.O.Z,

A.6.2 lnitial mean cros-seclional area,l

Calculate the initial mean cross-sectionat area,
applicable.

For rebated teslpieces (see Figure

l,

of the test-piece usjng Equation (A.10) or (A.tj), as

j):

t=wlrs)
For un-rebated test pieces (see Figure

(A.10)

j):

A=w(e)

(A.11)

4.6.3 lnitial longitudinat compressive stress at break

Cajculate- the longitudinat compressive stress

al break of each individual testpiece by dividing lhe recorded

oad at fractu.e. /.. (see A.5.3t. by the ,especlive,n,ltal mean c,oss-secional area, I,
determined in
accordancewithA62
@lSO20l1 Al rlghtsBerued

31

l5o 25780:2011
ISO 25780:201'l(E)

BS

for un_rebated

and
u
Calculate the iniiial longitudinal compressive stress at break ob,r for rebated
specified
value of the results ot mmpression tesii- on a sample of tesl-pieces as
in 4.3.

'b

il;;i;;;"]; il;;r;;se

A.6.4 Longitudinal compressivc modulus,-,c,m

A.6.4.1 Toe region
not replesent a properly oJlhe
]n a tvoical stress.strain curve (Figure A,2) there is a toe region, AC, that does

[v i t"G ,p or s""k' anJalisnment or seaiins orthe specimen' In order to

ffi;i;ili ;;il;A;i;"r"Ja parameters
modulus, strain; and offsel yield point, this artefact must be
as

oblain correct values of such

"o.p"not"o

rot to

gr"

the coriected zero poinl on the strain or e)dension aris'

z.

ta

vE-

NoTE

Some ohart recorders plot ihe mifiorimage of this graph

Figure A.2

32

Material with a Hookean region

o ISO 2011- AlrghL5 rseNed

BS ISO 25780:2011

ISO 25780:2011(E)

A.5.4.2 other regions

of the
GRP exhibirs a region of Hookean (linear) behaviour between C and D in Figure A'2' A conlinuaiion
is the
This
intersection
to
B.
axts
tinear (cD) regioriol the curve is consructed through the zero-stress
yietd
the
inctuding
measured,
musi
be
or
skatns
loir""t;;i"rol"tr"in point, 0, from which all extensons
point
at
any
stress
dividlng^the
by
be
determined
Ecm,
can
modulus,
ihe"elastic
oftsJied, if appficabfe.
is
defined
B'
which
aiong i;ilne c'd tor i1s exension) by the sirain ;iihe same point (measured from Poinl
as the poinl ofzero-strain, .o).

A.6,4.3 specific initial longitudinal compressive modulus,,Ecm

compressive
Calculale the specific inilial longiludinal compressive modulus, fcm, and rnilial longiludrnal
any
selecting
cJrve'
ponion
load
oeformaton
of
t'le
linear
lhe
Io
a
Iargent
mooulus. / ^-. bv drawirq
'niiial
stress
compressrve
p","itpi"Gilrrv it. o.zd% srin vatuer on this slraighl l',le porior' and dviding.the
1om ihe polnl' o' where lhe
.^..^ reoreslntea bv lhis Doint bv the corresponirng strain lveasuIe(see
(A'12)
also Annex c)'
Equat,on
in
ei6iala rangenr tin" iniersed; lhe slir_ax,s as shown
(A.12)

"" 00025.0
.

].

A.6.5 Statistical parameters

and 95 %
Calculate the adthmetic mean of each set of {lve test results and, if required' the standard deviation
given
2602'
plocedure
in
lSO
value
bythe
confidence lntervalolthe mean

A.7 Test report

The test reporl shall confolm to Clause12 of lSO604:2002, and shall also make reference to this
lnternational Standard.

.
.

@1SO2011 Allrlqhts rese ed

33

BS ISO 25780r2011

ISO 25780:2011(E)

Annex B
(normative)

Plastics piping systems

thermosetting plastics
- Glass-reinforced
Determination
of the compressive propertiei of pipes,
using spool test-pieces

(GRP) pipes

B.l

General

This annex specifies the method for delermining the longitudinal compressive propedies of pipes measured
on spool leslpieces made of glass-reinforced thermosetting ptastics (GRp). This test method is intended for
initial type lesiing of pipes conforming with this lnternationat Standard, with rebated and, if appticabte, grooved
spigots, 10 determine the minimum specific initiat tongitudinat compressive stress at break, db.
s min,;nd the
test-piece de-raling factor, 4.

8.2 P.inciple
A teslspool wilh rebated and, if applicable, grooved spigots at both ends, is compressed at a uniform rate of
compressive strain in the dkection parallelto the tongitudinataxis ofthe pipe, untitfaiture occurs.
The specific injtial longitudinal compressive slress at break, db is calculated accordjng io the procedures
s,
described in 8-6.

8.3 Test-pieces
8.3.1 Geometry
The geneml arrangement of a cylindricat test-spool is shown n Figure B.1 . inctuding rebates and, if appticabte,
grooves for seal ng rings at both ends.

8.3.2 Length of test-spool

The length of the teslspool,

1,,

shatt be at east (300 + 2 x

rj) r20

mm.

8.3.3 Production oI the test-spoot

Production method and tolerances for the testspoot, inctuding rebated spjgots and grooves (if appticable),
shallbe the same as that used for the produclion ofthe retated iipes.

34

@ ISO

2011

-Al

r ohts

eseryed

BS ISO 25780:201

ISO 25780:20{1(E)

'l
'r
,/

l
l
a)

lr

Section through test-spool

1...
t.

b)

Detaitofspigot at A

, length of the tesr-spoot oeressed in miJtimetEs (mm)

11 .ebated tengflr, expressed in milimeires (mm)
12 dishnce from the groove to rhe end oflhe spigor, expressed in mjltimelres (mm)
./ .1re.na, d aneler, e:Dressed ,n r,tlrehes rmrl
doD outside diameter, expressed in milimetrcs (mm)
.1q mrnimum outside diameier of the spigoi at a distance, u,
under the groove (if appticabte) expssed in milimetres
(mm)

e
Is

pipe wallthickness ofthe baffet, expssed

in milimetres (mm)
lhickness ofthethinnestsecijon, underthe g.oove (irappticabte)
expssed in milimelres (mm)

Figure 8"1

Geometry oftest-spoot

8.3.4 Number of test-picces

When using this meihod for an tTT, three lest-spools
shafl be tested_

B.3,5 Conditioning
L,nless otheMise specilled, store the test sDool
s for a1 Jeast 0'5 h at the ambient temperature prevailing
in the
rest iacthty, orior to

tesiino
a.ao ro, o,.,,nn ,.o"*"o'

35

85 ISO 25780:2011
ISO 2s780:201t(E)
ln cases of dispute, conditjon leslsDools
for 24 h at
a mulually agreed test conditionrng schedure.

(2313)'c

prior to testing' or alternatively subled

lhem lo

8.4 Test equipmenl

8.4.1 Testing machine

B.4.l.l

Generrl

The testing machtne shall be a servo-hydraulic

o
/ o q, lo th test piece lhar wiIJ cause

[rl,nj

"fpri""ur",a"..
"-p"iii"il,",i.
8.4.1.2 Load apptication ptates

cpabre or applving a ,ongitudinal Joad,

of maintaining the

it ro rri,l1"]-t'Y!','ltl"menl
il shall arso be capabte
j.""ril
,i,,,"iJ.ress;on'

'l

he plales for apply:no lhe load lo 'he re+-rn^or

shall be mde of haroered sreer and sharl be so constructed
ihal lhe Joad carried bv rhe lesr sDoot is .yi;tand
tr"*",1"0 r"iorlt i".r"""""-*'t,,ii,,?,nl.t
prrrt,", ,o
eacl. olher;n a plane normalto the loadilg axis.

""0

The plates shalleach have a diamelerwhich is

largerihan the oulside diameter, doD, ofthe teslspool.
:

8.4.1.3 Loadindicators
The tesling macnine shalJ be eoutDoeo wi,n a.
indicator caDable of ird,caling lre compressive
load apptted ro
the leslspooJ. rhe mecnanisr shdl oe essenria
t,y {.ee of :^edia tag a i i;;-r;i; ;;,olain'q- """0""n,"0
in e s +
and
rndrcate lhe toad apptied w:lr an accuracy

8.4.r.4

of- , Z

or

oerterortni

nOlcl,;;;ril** , *

Recording equipment

The recording equipment consisls o. an automal,c

oara 1006ind
capabte of recording the toad apptied.
2., versus tme. up to lhe
moTent ol failure of the tesr-pi;;e: .syslem
vvnen
measurements
ol strain are also beino
ialen
_lhe,autornatic data toggirg systern s.a be c;pabte of registering lhe slrarn versus the apptie;
rongludtna
oad, F up to the moment off:ihrrF

B.4.2 Devices for measuring the dimensions

of the test_spool
Use a micrometer or equivalent capable of readinq
to at teast 0 01 m'rl. for measuring lhe sp,gol,s watj
HiT[ti."*, surrace laver thjckness depth of ,eoate ano. ,t appticabre. the groove, as rnd,cted ;n
Use a lape or other suitable device readjnc
o,amete,i,roo, a,ana ao
i^

"-s-il;il

ffi;lYJi."t

least

mm' ror measuring the length of the spool, z,

8.5 Test procedure

8.5.1 Measurement of dimensions
lrake measurements of lhe dimensjons indicated jn
Figure 8.1 in accordance with tSO 3j26.
ll,4easure and record the vatues of the
dtamete
-'"' 'EErs doD dr and ds as
rigure a.r, ro an

$l!";;

"no

wellas lhe spool iength l', as jndicated in

;;:'
"ccriacy?;;
of all other dimensions of the spigot indicared
in Figure B.1 to an
'""o" *"
accuracy ot

"alue

36
@

iso 2o11_Arrrioh!s resetoed

l50 25780:2011
ISO 2578012011(E)
BS

8.5.2 Testtemperature
Perfor'n lhe test at one of the lemperatLrres speciljeo tn 8.3
5. oreferably

condrlionind

$e same temperalure

used for

8.5.3 Positioning of the test-spoot in the test machine

Place a test_spoor behveen the surfaces of thecompression prates
and arign the cenlres of the compression
pletes. Posrlion a wooden chrpboaro ptate 6rrr
lhick at toffr enas ietween itti- f"esi-spoo, ana tf,e
compression piales. Ensure rhat the contact between the lestspoot
th;;;;";; oiine prates is as
uniform as possibte and that ihe surfaces of ihe compression ptatei
";d
are paiati;il;;;#.-'

8.5.4 Application of toad

Slart the data recording equipmenl.

Apply ihe load 10 the testspool at a compressive strain rate oI

suslain the apptied toad.

t2

mm/min unlil ihe lestspool is unable lo

For the duration ofthe test, record, on a continuous time

basis, the applied longitudinal compressive load,
and the strain, e

Record the maximum compressive force at failure, Fc, in

).-

-Fc,

(kN) and, if applicable, the strain at

8.6 Calculation and expression of results

8.6.1 lnilial mean crcss-sectiohal area,,4.

Calculate the rnilial mean cross-sectionat area,,rs,
millimetres (mma.

oflhe spigot using Equation (B.t), expressed in square

," =,f{o,u*rn)' -(o,sx,1r)'?1

(8.1)

z/o

is the external spigot or groove diameter (see Figure B.t), expressed

in mitJimetres (mm);

is the inlernal diameter ofthe pipe (see 3.4), expressed in mi imeires (mm).

8.6.2 Specific initial longitudinal compressive stress at break, db.

Calculate lhe longitudtnal compresgve stress at break, ab, expressed in

megapascals (l\,4pa), for each oflhe
lhree lest.spools, using Equatr6n (B.2)

r^ x 103
lB.2\
The specific inilial longirudinal compressive stress at
break, db s (see 3.'12), is the mean ofthe three values of
ob minus two stanoard deviations lsee Equation (8.3)1.

ao," = mean ao -fZ(highesr

@

lso 2011-A nghts reseryed

db

lowestl,b)x0,5908]

(8.3)

BS l5O 25780:201.1

ISO 25780:2011(E)

B.7 Teat report

The test report shallinctude the fo owing
information:

a) a reference 10 this lnlernational Standardi

b) ell details necessary for comDtete idenrification
manufaclurer,s code number arid history,

of the pipe(s) being tested, inctuding type, source,

c) the dimensions of all tesl-spooJs;

d) method of preparing the test spootand any detaits ofthe manufacturing
e) the number of test_spools lestedi
D
g)

the lest equipment detaits, type and accuracy;

h)

the rate oftoad apptjcalion and rate of resulting

sirain;

method used;

the posiijon in ihe pipe from where the testspoots

were obtained;

,""0

for condiiioning

and for resting, pius detairs of any speciat conditioning

lrealment,
') $;;1';rn"r"
l) the individuajtest data and results:
k) lFe carculated test resuttsi
l) any factors which may have affecled the resulls,,such as any incidents

operaling detaits not specified rn thrs tntemarionat Stan.tar.t. '

m)
=:

if

which may have occurred or any

date and duralion oflhe tesi.

@ ISO 201 1

AII nghts

reeryed

BS ISO 25780:2011
ISO 25780:20li(E)

Annex C
(normative)

Procedure for the calculation of

the permissible jacking force on
a GRp_(Up) pipe, Fper.,p

C,l

General

#ki"i"l""1#3,J::$J"J33l "_l,ff '?l': :[*:"$1f

llgl!.
ll,:*,9

.:
:

L:'

3,""s,TI"']"*"

prpe during instalation, this

load

prcssur rransfer
rinss are somerir

;:lll,,,::,

t_lijxli ;!$ (:;:"i,Ti;

ln lhe ideat situation teadrng

10

H;1111"",1Jif

JHfs"il"#?::.",:,,9i :::L1",*:ff ff.1

;;

theoreircet .l

;ri:n: j",:*:}:il ;:t,;,rinis,r,";'j:[ ;:ln",r.#f;i+:,,ff

:;

tffi :?J:::

i;#nii#,'Urii*1* ,'ri#iit[#]r,*f, $,"{jjffi",:g

rf, #,*ifl kil"]rx,,,H{{"}!
The foljowing subclauses,

whtch are based

p",,i"$ur"ii"',;,-giii;;Jffi,;::,,-_:::,T$:ll,#:"iT:*:iJ:,lJ:#J"(rsso)

desc,jbe how the

=
=

C.2 Symbols and abbreviations

The symbols and abbreviations
used in this annex have the foljowing
meanjngs (see atso Figures C.1 to
C.6):
the compressive (material)
safelv cr
calculation of GRP pipes in a direction pa&let
to the lonsitudinat axrs of !h" p,p;
(;'""J;T:j,fo'

),

',h"

d'
dm*

angular cteflection between

adjacent pipes (see 4.7.3. f expressed
),
in degrees (.);

maximum stress in a specific loadin(

rn newtons

oo

persquare

mi[ir"l," (N;1;l]:tion

o""urring at the edge of the

iacking face, expressed

arithmejic mean value as lhe avera

exp,ess.o

6at

'n

n.wrons

pei;il;;,ffiffIi,li;:ll;.

or tensire srress over the totar spisot

section.

allor /able stress, laking into

accountlthe (malerial) safety factor.

mrnmete

(Nhm2);

"' " t' il,'ffir{ specific jnitial compressive siress al break, expressed
1s
minimum pipe cross-seclional
area o
3.tj), expressed in square

@ ISO

2011

-Atriohis

resetoed

,iflir"lr"" filr"rl:pigot'

expressed in neuons per square

in neMons per square milimetre

or in the groove oI lhe spigot, if

applicabte (see

BS ISO 25780:2011

ISO 25780:2011(E)

ds

spigot or groove diameter (see 3.5), expressed in miltimetres (mm)i

axialcompressive elaslic modulus ofthe pipe, expressed in megapascals (t\,4pa)i

fj
,i],

manufacturer's declaredjacking toad forwhich a pipe was designed, expressed in kilonewtons (kN)i

catc

p
Furt
d
/
Z
Sa
Fpem

theoretical des ign jacking load, expressed in kitonewtons (kN);

permissible jacking load on the pipe, expressed in kitoneMons (kN);

ultimale longitudinal loadi

internal diameler, expressed in millimetres (mm)i
laying lenglh ofajacking pipe, expressed in milimetres (mm);

diametrical extent of compression in thejoint segmenls, expressed in milimetres (mm);

stress eccentricity dependence is ihe dependence of the stress rato,

(see Figure C.6)

4,

on ihe "alio Zlds

stress ratio dma/do.

C.3 Design criteria

C,3,1 Principles
The guidance in this annex is based on the procedures contained jn ATV 16j.
Calcu lalion of the Jacking forces,

and Epem p, retative to a particutar pipe is dependeni on lhe m inimum

mtn, as declared by lhe manufacturer and verified on the
basis of testing test pieces in accordance with 5.4.4, and ihe minimum pipe cross-sectional area at the spigot

l.

ca c

specific nrlia cornpressive stress'at break, db s

,rs, in accordance with 3,6.

The manufaclurer shall decla re thejacking load for which eachjacking pipe was designed
Jdesignjacking load,
,1 (see 3.20)l and lhis load shali be not greater than the theoreticat design jacking toad (lj
carc).

The theoretical desrgn jacking load,

cr( (see 3.21) is catcutated using Equation (C.1) which assumes that
tne jacKrng load is concentric and perpendicu arto the lointfaces, j.e, no defleclion and alljoint faces perfec y
square.

drt

Fult

(c.1)

is the ultimate longiludiral load (see 5.5.2), expressed in kionev,tons (kN);

l,,s

lhe longiludinal cornpressive (material) safetyfactor.

The longitudinal compressive (material) safety factor, 7i shattnot be tess than 1,75, untess specific agreement
justifles the use of a lower value.

NOTE

The desgn jacking toad as dectared by ihe ppe manufaclurer or catcutaled n accordance with lhis annex,
does not include any safety iactor to be used by ihe coniraclor, having rcgard io the jackng meihod and subsequent
deaection oiihe pipes, ihe nature ofground and unforeseen conditions, orforthe slEss iatio aarcss thejacking face (see

40

o rso

2011

-arrdhrs

resetoed

BS tSO 25780:2011

ln the 'ciosed

joinf

tSO 2SZB0:2011(E)
sfuralion (see 3.40) the permissibte jacking force on the pipe,

t*_

shal not induce

a
^,
srress whrch exceeds the a owabte vatue catcutated based on zero
stress a "dii "Oiameter
_extremty,
increasing uniformiy to the attowabte stress, oen=db,s,ninff
etlhe opp""it";;ity.

ln lhe_"open joinf' siluation (see 3.41), with the permissjbte.jacking

force on the pipe, fpem, p, acting mor
eccentrically, the maximum compressive slrcss occuning at the edgl
of lhe jacting iace Jh1ii,not exceeO the
s;. oat = ob, s.ntn y . The correlponding s-tress aisriuuiio'n
in" pint i"
f
I:Tr"l^"llT".Y:
rn. F gure U. r . rn this "J""
case lhe permissible jacking force on the pipe, I'pem, will be smaller
"".""
"r,o*n
lhan
in the "closed
p,
joinf siluation.

-l-tt _._i

a)

b)

_._.

Compressed area

Sfiess diagram

Kev

'l_

'closd

jonr

situation

averags comprecsive stress over loht spigot secrion

diametfcal extent of compression in thejojnt segmenis, oipressad

in milimeires

Figurc C,l
O ISO 2011

-Alt

n:ghts

Eetoed

Compressed area and strcss diagram for tho deflected aituation

41

BS ISO 25780:2011

ISO 25780:2011(E)

G.3.2 Permissible iacking force on the pipe, Fpenn

The permissible jacking.force-on the ptpe, Fpsm p can be calcutated us,ng Equation (C.2), which iakes jnio
accounl a possible angular deflection:

luL

'Pem

P-l

\do-d

(c-2\

sa

)2

(c.3r

is the compressive material safety faclor coefficient for GRp pipes, in a direclion pa?llel

to the longitudinal axis ofthe pipe;

.i

s.

is the stress eccenlricity dependence (SED), which is the dependence of the stress ratio,
+, on the ratio Z/4 (see Figure C_6)i

s,

is the stress ralio, dmaxlooi

is the minimum specific^initial compressive stress ai break, expressed in newtons

pea

square millimetre (N/mm2);

td^-d.\2
rs

the minimum plpe cross-sectional area of the spigot, expressed in square mi,limelres (mm2)

The factor, .ta, has to be a1 least 2 for the case of concentric jacking. ln the cse where an angular deflection
is to be allowed for or is planned, .!a is obtained from Figure C.6 after catcutating Z in millimelres, using
Equation (C.4) and then Z/ds.

l.,
,p tan,

,_o

(c.4)

!)
The angu lar deflection is retated to ihe etastic com prcssion acco.ding to Equation (C.5).

A/
1sn5

-v2n!=22-=4!
2ZZ

(c.5)

The elastic compressive strain atthe circumference is expressed by Equation (C.6).

Lt6t
tEpFe -

al =

6^-

(c 6)

Using Equalions (C.5) and (C.6) gives the relation betu/een angular deflection and the resulting stress, which
is expressed by Equation (C.7).

En 6 -

42

!{tL
ZEp

(c.7)

@ ISO

2011

-Alrghls

reserued

BS ISO 25780:201

ISO 25780r20r,1(E)

:)_

..1
I

.ompression angte in the ptpe, d expressed in desrees

c)
elastic compressjve srrain ar rhe ckcumience oflhejackjng pipe,
e)ercssed jn mi[imerres (mm)

omd maximum stress, expressed ii newtons per square m limetre (Nhmr)

diamot cat extent ot compression in the
toint segments, expEssed in milinretres (mm)

Figure C.2

Angutar deflection

The permissible iackinq force on the Dioe

j, p, is catcutated using Equaiion (C.g) for a determined angutar
deJlection, d and rs at ihe maximum ;atueP;ridfi
d= od, ,sins a rictoi oi iailtv
z in
with C.3.1 and 5.5.31
"""ora"n""

ioiciii

dotmrn
/s
_'permp"

(c.8)

NoTE lr a pressue transfer rino is used ,r rh. intedace with other maleriats, such as interjack slations
or a cufling
he.d (shetd), use Equation (c 9)insi;ad of(C 7)
l)
la+ /e.1
tanr=9^l-L+
z

\2. Ep Ew 2. Eetl)

d
Z
,
1p
,p
a
,.1s
Ew
O ISO 2011

(c.s)

is the stress, expressed in neMons per square mijlimetre (N/mm1i

is the diam etricaj extenl ofcompression in thejoini segments,
expressed in millimetres (rirm);

compression angle in the pipe, expressed in degrees (.);

is thejacking pipe tayjng tength, expressed in milimelres (mm);
is the axialcompressive elaslic modulus ofthe pipe,
expressed in megapascls (lt{pa);
is the thickness ofthe pressure transfer rjng (packer),
expressed in mjllimetres (mm);
is the minjmum pipe cross-sectional area at spigot;

is the compressjve elaslic modulus of the pressure iransfer rjng,

expressed in megapascats
(Mpa);

-Atlnghts reseryed

43

l50 25780:2011
ISO 25780:2011(E)

BS

/"rr
E"rt

is the tength

oflhe shietd orinte ack stalion, expressed in mi imetres (mm)i

is the compressive elastic modulus of ihe shieid or interjack station,

expressed in megapascats
([.4pa);

.la
,!

is the slress eccentricjly dependence, which is the dependence

of the stress ratio, .'ma/do, on
the ratio Z/ds. See Figure C.6i
is the stress ratio, omaxldo.

C.3.2.1 Evaluation ofjointgap and how it is retated to eccentricity

ln this subclause three joint gap conditions are considered which are defined
by lhe |?tio, Ztd^, and.
deoendhg Lpon 'ts value,.the aDp.ooriate equatior,or lhe calcJlation ot tne
sfes. ,'atio. ;";";..tg;;;
lhe siress ratio can atso be der,ved using FrgJre C.6 rorr kno$/tedge ot ite
otpe,s geomeli and lhe ratro,
z/do. rhe examptes in C.4 show how this evatuation is incorporated inlo
aases;ent oi required pipe
ln all cases the maximum stress shouid not exceed ihe a|o\i/abre
stress obtained from Equation (c.10).

(c.10)

/
C.3.2.1.,

Closed joint condition

FigurE C.3
For this Joading condilion:

L,t
ds'

Closed joint

(c.11)

Z
sa

44

=on
Z-

os

\c.12)

OlSO2011 Allrightsreserued

BS ISO 25780:201,l

C.3.2.1.2 Maximum eccentricity by

Figure C.4

a ctosed

Closed

ISO 25780:2011(E)

joint

joint-

Maximum eccent.icity

For this Joading condition:

Z=t

(c.13)

and

s"

L=z

(c.14)

C.3-2.1.3 Open joint

Figure C.5
@ ISO

2O1l

-Alrghts rsered

Open

joint
45

BS l5O 25780:2011

ISO 25780:2011(E)
For this loading condition:

L.1

(c.15)

and

.' _"
oa {z lai)
ds
\dsl

(c.16)

Figuie G.6 ..'. SED dependenco of sEess ratio o/ do on the ralio Zlds (cgntinued)
@ tSO 2011

-Altnghts

eered

BS ISO 25780:2011

ISO 25780:201,t(E)

10

tL
u.

0,s

nV

7
6

-\t.

\\

0,8
0,7

Jt
I

0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 Z tds

tc-

Figu.e C.6

(.)

l!

.*

SED dependence of stGss ratio o/ oo on the rai,o Zlds

C,4 Examples
C.4.1 Pipe properties assumed for these catculations

Pipe

doD I

Pipe laying tength

Longiludinal compressive modutus of

elasticity

026 mm

ds
/

6 000 mm

zp

t8 000 lllpa

998,1 mm

Declered mjnimum specific iniiialaxial compressive

stress al

break ,b s mii = 90 N/mm2

C.4.2 Geomel cal intermediate calculalions

C.4.2.1 Detenni.ation of internal diameter (4)
Using Equation

(C.17):

di= doD-2xe

.ri= 1026
@ISO2011

-Alt

2.

44 = 939 mm

(c.17)

ghtsBeryed

47

BS ISO

25780:201i

ISO 25780:2Oti(E)
G.4.2.2 Determination of minimum closs-Bectional alea at
spigot
Determination oi the minimum doss-sectionat
area at sprgot,,4s, using Equation (C.10).

a.

=,lbsa^\'
"l
L "' - 'to.sa'fl
=ri (0.5.ss8,i)' (0,s\93s),
= ollzas osr), - tzrs

,I
saz)

(c.18)

= sr oao

,, .

Determination of internat diameter divided by spigot

or groove djameter.

ditds
'ldn=SSs

gru,'t

=,*

C,4.3 Determination of the ultimate longiiudinal load,

(c.19)
f.urr

The determinatjon of the ultimate tongitudinat

load,Futt is caried out using Equalion (C.20).
ob_._mtn, A.

-,

000

_s##_r,r,**

(c.20)

E
C.4.4 Detemination of the theoreticat design
racking load, I],
E
E

carc

The determinaiion of the theoreticat design jacking

load
4, erc is cafiied out using Equation (C.21).

.
'telc

F,t

(c.21)

=ffi=oroo*,

C.4.5 Determination of the permissible

lacking load at maximum eccentricity fo. a ctosed

lornt

The delermination of the permissibte jacking toad at

maximum eccentricity for a closed joint f.pem, is canied
p
out usjng Equation (C.22) and Equation (C.14)
where the stress ralio,

r,=*=,

oo.s.m'n <1.

^p*.,p = t OoO,

frs.
(c.22)

90r91385

t 000^a75,2 =2350kN
@ rSO 2Oi

I - A[ nghts 6ryed

BS tSO

25780:201i

tSO 2s780:201i(E)

C.4.6 Oetermination of the angular deflection at maximum eccentricity

for closed joint
The delermination of lhe anoular defle.non ar maximum eccentricity tor
closed joint
Equalion (C.23)

tan,

is carried out using

tanr= qelLx

|
ZLo

(c.23)

Frcrt Equalion (C.24) Ztds=

and from Equaiion (C .25)

6a

ob,s,nirty

Z =.la=998,1 mm

(c.24)

(,.r = 90/1,75 = 51,43 N/mm2

(c.25)

and

rence ran,r=!119.
998

t
=

NorE

(see 5.5.2)

i!9118

000

-'.-n,,
" 176 iherefore
n

,=

0,984 01.

veriry in lhis case the angurar derection capabiriry or the coupring and lhe avairabe
overcutorihe bore

C.4.7 Calculation of the permissible jacking force on the pipe,

defleciion

aperm, p, at

0,6'angular

Assuming thai the maximum stress is equallo ihe allowable stress

l
=

Therefore rmax = dar= ab,

s,

mn//,

Hence d-ar= 90/1,75 = 51,43 N/mm2

T6nsposing Equatjon (C.26) to obtain Zwe have

z=tuxL
lanr rp
rnererore

(c.26)

. 6990 -ro:r,.
z- 0.010
-911L
472 3 t8 000 -" "'

dq=1j!1=
998.1

5a

(c.2n

Because this vatue is greater than t, this is a closed ioinl condiiion

@ ISO

2011-A

nshts reserued

49

BS ISO

25780:201I

ISO 25780:20{1(E)
Using Equation (C.12) we obtain the stress ratio

Z
ds

s =!=
"o d"1-05
(c.28)
1

637

998'1 = r a:a z
='1637
998,1
Fpem,p is obtained using Equation (C.29).

a.
.p"*p=looorr,rs.
6b,s,min

(c.29)

The perm issible jacking force on the pipe, Fpem

p, at 0,6. angutar deflection is:

51,43x91386
1000x'1,438 7

=3267kN

@ ISO 201

All dghb

l@red

BS l5O 25780:2011

ISO 25780:2011(E)

Bibliography
tll
I2l

Confidence inteNal
ISO 2602, Statistical interyrotation of test rcsults
Estination of the mean
joints
Pai 3: Test nethocls
EN 295-3, Vittified clay pipes and fittings and pipe
for dmins and sewe/s

I3l

Af{

161, Static calculation of diven pipes (1990\

ar

iy
a,

q
@ ISO 201 1

Al1

iqhts Beryed

Revisions

3 r+ dnoaro d" .odar.o o, a

.,! sran-ses 0r B,
ddd..ho" d far" ...e lhd .L e, p
I h rhe (or. d I a a o'35,,o r pro.e r.e qu",tr/ or o.. p,ooucs a.o.er.
, es W" v-ou d b" g.ae i, d
/o-e.rnor g a :a,.uac, o ano,g-,., r-re

u! qLt)B+tsh.doa{ ro-(l -o, .eSeoe'".1o'ie.ah. G,rcm

nlrp" e.pon, ble. .he d- r ._ o- 1lrn ono"roL.oo. ,le11,oelrcnr
T.l: +44 (0)20 8995 9OOl Far: +44

(O)20 s996 7OO,

Bt ori4: Meroq. e. -o,o a,.poa . q.e1 ce cd t"d oL,S ..h e r-rcr

'"ar tubrr bea d.,o-ar r / rcce.d r.c t.en eoiro. , or nonoaro\
^
Tel: +44 (0)20 8995 7669 Fax +rr4 (O)20 9996 7OO1

lnformation on standards
BS

pode.d \roe.dnq"oI -'o r

and inlernal oial nandards rhouqh

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+44 (0)20 8995 7111 Fa* +44 (O)20 8996

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eBr !-oo o t-" a"o,,.e m.*igrcuo,onirrop,
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can be addr$ed ro ESlCusomer srur.es

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Ehail plB@brigreup,(om

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la_ -al b" r"p oo
. p'o.o(op] -q
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of BS
be ooG. "o Dera,
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rohl & Licensi.q Manager

Tel

+,14

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{0)20 8996 7070

Enail opyrightobsigreup.<on
BSI Group

Headquarte6

389 Chiswi.k High Road London W4 4AL UK

lei +44 (0)2089969001

!!w.bs

group.coh/srandards

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