Iso 7186 2011
Iso 7186 2011
Iso 7186 2011
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Yours Sincerely,
Deborah Stead
Head of Committee Services and International Secretariat
INTERNATIONAL ISO
Committee member copy: Do not reproduce
STANDARD 7186
Third edition
2011-07-15
Reference number
ISO 7186:2011(E)
© ISO 2011
ISO 7186:2011(E)
Committee member copy: Do not reproduce
Contents Page
Foreword ............................................................................................................................................................iv
1 Scope ......................................................................................................................................................1
2 Normative references............................................................................................................................1
3 Terms and definitions ...........................................................................................................................2
4 Technical requirements ........................................................................................................................7
4.1 General ...................................................................................................................................................7
4.2 Pressure classification .........................................................................................................................9
4.3 Dimensional requirements ...................................................................................................................9
4.4 Material characteristics.......................................................................................................................13
4.5 Coatings and linings for pipes ...........................................................................................................14
4.6 Coatings for fittings and accessories ...............................................................................................14
4.7 Systems design requirements ...........................................................................................................15
4.8 Leaktightness of pipeline components.............................................................................................15
4.9 Marking .................................................................................................................................................15
5 Performance requirements.................................................................................................................16
5.1 Leaktightness of joints .......................................................................................................................16
5.2 Diametral stiffness ..............................................................................................................................17
5.3 Chemical resistance............................................................................................................................18
5.4 Abrasion resistance ............................................................................................................................18
6 Test methods and test frequencies ...................................................................................................18
6.1 Dimensions ..........................................................................................................................................18
6.2 Straightness of pipes ..........................................................................................................................19
6.3 Tensile test ...........................................................................................................................................19
6.4 Brinell hardness ..................................................................................................................................21
6.5 Works leaktightness test of pipes and fittings for pressure applications ....................................21
6.6 Works leaktightness test of pipes and fittings for vacuum applications ......................................22
7 Type tests .............................................................................................................................................22
7.1 Leaktightness of gravity pipeline components ................................................................................22
7.2 Leaktightness of joints to internal pressure.....................................................................................22
7.3 Leaktightness of joints to external pressure....................................................................................23
7.4 Leaktightness of joints to negative internal pressure.....................................................................24
7.5 Diametral stiffness of pipe..................................................................................................................24
7.6 Chemical resistance to effluents .......................................................................................................26
7.7 Abrasion resistance ............................................................................................................................27
8 Tables of dimensions..........................................................................................................................28
8.1 Socket and spigot pipes .....................................................................................................................28
8.2 Fittings for gravity applications.........................................................................................................30
8.3 Fittings for pressure and vacuum applications ...............................................................................32
Annex A (informative) External protection .....................................................................................................33
Annex B (informative) Internal protection ......................................................................................................34
Annex C (normative) Allowable pressure for pressure sewers ...................................................................35
Bibliography......................................................................................................................................................36
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 7186 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 2, Cast iron pipes, fittings and their joints.
This third edition cancels and replaces the second edition (ISO 7186:1996), which has been technically
revised. A new classification system for pipes and fittings based on pressure is introduced with minimum wall
thickness determined by allowable operating pressure.
1 Scope
This International Standard specifies the requirements and test methods applicable to ductile iron pipes,
fittings, accessories and their joints for the construction of drains and sewers outside buildings:
⎯ to convey surface water (e.g. rainwater), domestic waste water and/or certain types of industrial effluents,
either in separate systems or in combined systems;
NOTE In this International Standard, all pressures are relative pressures expressed in bar1).
This International Standard contains specifications for materials, dimensions and tolerances, mechanical
properties and standard coatings of pipes, fittings and accessories. It also gives performance requirements for
all components including joints.
This International Standard is applicable to pipes, fittings and accessories cast by any type of foundry process
or manufactured by fabrication of cast components, as well as corresponding joints, in the size range DN 80 to
DN 2600 inclusive.
⎯ manufactured with socketed, flanged or spigot ends (joint design and gasket shape are outside the scope
of this International Standard), and
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 2531, Ductile iron pipes, fittings, accessories and their joints for water applications
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
materials
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 10804, Restrained joint systems for ductile iron pipelines — Design rules and type testing
EN 1092-2, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories,
PN designated — Part 2: Cast iron flanges
3.1
ductile iron
type of cast iron used for pipes, fittings and accessories in which graphite is present primarily in spheroidal
form
3.2
pipe
casting of uniform bore, with straight axis, having either socket, spigot or flanged ends
NOTE This does not apply to flanged sockets, flanged spigots and collars, which are classified as fittings.
3.3
fitting
casting other than a pipe, which allows pipeline deviation, change of direction or bore
NOTE Flanged sockets, flanged spigots and collars are also classified as fittings.
3.4
accessory
any casting other than a pipe or fitting, which is used in a pipeline
EXAMPLE 2 Glands, bolts and locking rings or segments for restrained joints.
3.5
inspection chamber
component of a discharge system, of a drain or of a sewer providing access from the ground surface for
inspection and maintenance equipment
3.6
manhole
component of a sewer of sufficient size to provide access from the ground surface for inspection and
maintenance operations by personnel and equipment
NOTE A flange can be fixed (e.g. integrally cast, screwed-on or welded-on) or adjustable. An adjustable flange
comprises a ring, in one or several parts bolted together, which bears on an end joint hub and can be freely rotated around
the barrel axis before jointing.
3.8
spigot
male end of a pipe or fitting
3.9
spigot end
maximum insertion depth of the spigot, Li, plus 50 mm
See Figure 5.
3.10
socket
female end of a pipe or fitting to make the connection with the spigot of the next component
3.11
gasket
sealing component of a joint
3.12
joint
connection between the ends of pipes and/or fittings in which a gasket is used to effect a seal
3.13
flexible joint
joint providing significant angular deflection and movement parallel and/or perpendicular to the pipe axis
3.14
push-in flexible joint
flexible joint assembled by pushing the spigot through the gasket into the socket of the mating component
3.16
restrained joint
joint in which a means is provided to prevent separation of the assembled joint
3.17
flanged joint
joint between two flanged ends
3.18
nominal size
DN
alphanumeric designation of size for components of a pipework system, which is used for reference purposes
NOTE 1 It comprises the letters DN followed by a dimensionless whole number, which is indirectly related to the
physical size, in millimetres, of the bore or outside diameter of the end connections.
3.19
nominal pressure
PN
numerical designation, which is a convenient rounded number, used for reference purposes
NOTE 1 All components of the same nominal size, DN, designated by the same PN number have compatible mating
dimensions.
3.20
leaktightness test pressure
pressure applied to a component during manufacturing in order to ensure its leaktightness
3.21
allowable operating pressure
PFA
maximum internal pressure, excluding surge, that a component can safely withstand in permanent service
3.22
allowable maximum operating pressure
PMA
maximum internal pressure, including surge, which a component can safely withstand in service
NOTE This test pressure is different from the system test pressure which is related to the design pressure of the
pipeline.
3.24
diametral stiffness of a pipe
characteristic of a pipe allowing it to resist diametral deflection under loading
3.25
discharge system
system of pipes, fittings, accessories and joints used to collect and drain waste water and rainwater from a
building
NOTE It comprises discharge pipes, stack ventilation pipes and rainwater downpipes, installed within the limits of a
building or attached to the building.
3.26
drain
system of pipes, fittings, accessories and joints installed outside the limits of a building in order to connect the
discharge system of the building to a sewer or a septic tank
3.27
sewer
pipeline designed to collect waste water and rainwater from buildings and surface water and to convey them
to the point of disposal or treatment
3.28
gravity sewer
sewer operating normally under free flowing conditions
3.29
pumping sewer
pressure sewer
sewer (or section of a sewer) operating under positive pressure
3.30
vacuum sewer
sewer operating under negative pressure
3.31
combined sewer
sewer collecting together rainwater, surface water and waste water
3.32
separate sewer system
sewerage system which collects waste water separately from surface water
3.34
type test
proof-of-design test, which is done once and is repeated only after change of design
3.35
laying length
Le
length by which a pipeline progresses when an additional pipe is installed
NOTE 1 For socket and spigot pipes, it is equal to the total length of the pipe, Ltot, minus the maximum spigot insertion
depth, Li, as given by the manufacturer and as shown in Figure 5. For flanged pipes, it is equal to the total length of the
pipe.
3.36
standardized length
length of pipe barrel and fitting body or branch
NOTE 1 For socket and spigot pipes, it is designated Lu (lu for branches). For flanged pipes, and fittings, it is
designated L (l for branches). See Figure 5 and ISO 2531.
NOTE 2 For flanged pipes and fittings, the standardized length L (l for branches) is equal to the total length. For
socketed pipes and fittings, the standardized length Lu (lu for branches) is equal to the total length minus the depth of
socket, as indicated in the manufacturer's handbooks.
3.37
ovality
out-of-roundness of a pipe section, equal to Equation (1):
( A1 − A2 )
100 (1)
( A1 + A2 )
where
NOTE 1 Pipes and fittings are designed to a length selected in the range of standard length plus or minus the deviation
(see Table 3); they are manufactured to this length plus or minus the tolerance given in Table 4.
3.39
component
any product defined as an element of a pipeline, such as a pipe, fitting or accessory
3.40
hoop stress
σ
stress in a pipe or fitting under pressure, acting tangentially to the perimeter of a transverse section
4 Technical requirements
4.1 General
Thicknesses, lengths and coatings are specified in 4.3.2, 4.3.3, and 4.5 and 4.6, respectively. Where, by
agreement between the manufacturer and the purchaser, pipes and fittings with different lengths, thicknesses
and/or coatings, and other types of fittings than those given in 8.2 and 8.3, are supplied in accordance with
this International Standard, they shall comply with all the other requirements of this International Standard.
This includes pipes and fittings manufactured to national standards and regulations.
The standard nominal sizes DN of pipes and fittings are the following:
80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1400, 1500,
1600, 1800, 2000, 2200, 2400, 2600.
The stiffness and allowable diametral deflection of ductile iron pipes are those given in Table 11.
The pressures PFA, PMA and PEA (see 3.21, 3.22 and 3.23) for pressure sewers are those indicated in
Annex C.
NOTE Where designed, installed, operated and maintained with due regard to the factors described in Annexes A
and B, ductile iron pipes, fittings, accessories and their joints maintain their functional characteristics over their service life,
due to time-independent material properties and high factors of safety.
Pipes, fittings and accessories shall be free from defects and surface imperfections which can impair their
compliance with the requirements of Clauses 4 and 5.
Where necessary, pipes and fittings may be repaired by the manufacturer, for example by welding, to remove
surface imperfections and localized defects, which do not affect the entire wall thickness, provided the
repaired pipes and fittings comply with all the requirements of Clauses 4 and 5.
4.1.3.1 General
Joint design and gasket shapes are beyond the scope of this International Standard.
Rubber gasket materials shall conform to the requirements of ISO 4633 for sewerage applications. Where
materials other than rubber are necessary (e.g. high-temperature flanged joints), they shall conform to the
appropriate International Standards.
Flanged joints shall be designed such that they can be attached to flanges whose dimensions and tolerances
comply with ISO 7005-2 or EN 1092-2. This ensures interconnection between all flanged components (pipes,
fittings, valves, etc.) of the same DN and PN and adequate joint performance. Bolts and nuts shall comply, as
a minimum, with the requirements of ISO 4016 and ISO 4034, property class 4.6. Where washers are required
they shall comply with ISO 7091.
In addition, each type of flanged joint shall be designed to meet the performance requirements as specified in
ISO 2531.
Although it does not affect interconnection, the manufacturer's handbook shall indicate whether products
contained therein are normally delivered with fixed or loose flanges.
Pipes and fittings with flexible joints shall be in accordance with 4.3.1.1 for their spigot external diameters, DE,
and their tolerances. This provides the possibility of interconnection between components equipped with
different types of flexible joints. In addition, each type of flexible joint shall be designed to meet the
performance requirements of 5.1.
For interconnection with certain types of joints operating within a tighter tolerance range on DE, the
manufacturer's guidance should be followed as to the means of ensuring adequate joint performance up to the
highest pressures (e.g. measurement and selection of external diameter).
For interconnection with existing pipelines, which can have external diameters not in accordance with 4.3.1.1,
the manufacturer's guidance should be followed as to the appropriate means of interconnection (e.g.
adaptors).
Restrained joints for ductile iron pipelines shall be designed in accordance with ISO 10804. Their spigot
external diameters, DE, and their tolerances shall comply with 4.3.1.1.
Pipes and fittings for sewers and drains shall be identified externally by a specific colour (see national
standard). Identification is possible by various means, e.g. external paint, polyethylene sleeving or a warning
tape.
NOTE This is to allow easy identification of installed sewers and drains and to avoid mistaking with pipelines for
water and gas supply.
4.2.1 General
Depending on the manner by which the surface water or sewerage is transported, the sewerage system can
be classified as a pressure sewer or a gravity sewer and, accordingly, flexibly jointed pipeline systems can be
classified as pressure pipes/fittings or gravity pipes/fittings.
The allowable pressures within a pipeline system shall be limited to the lowest pressure classification
component within the system.
Components with flanged joints shall be classified by the PN number of the flange.
Gravity pipes are designed for gravity sewer applications. Their normal service, internal and external
pressures are defined in Table 6.
Pressure pipes are designed for pressure sewer applications and are classified by the allowable operating
pressure (PFA), prefixed by a letter C.
The pressure pipes shall be selected from the preferred pressure classes C25, C30 and C40 as defined in
ISO 2531. Their normal service internal and external pressures are defined in Table 6.
The allowable pressures within a pipeline system shall be limited to the lowest pressure classification
component within the system.
4.3.1 Diameter
Table 12 gives the values of the external diameter DE of the spigot end of pipes and fittings, when measured
circumferentially using a circumferential tape in accordance with 6.1.1. The positive tolerance is +1 mm and
applies to all pressure classes of pipes and also to flanged spigot fittings.
The negative tolerance depends on the design of each type of joint and can be as specified in national
standards, or, when not so specified, in the manufacturer's handbook, for the type of joint and the nominal
size considered.
The manufacturer's recommendations should be followed with respect to the necessity and means of ovality
correction; certain types of flexible joints can accept the maximum ovality without the need for spigot re-
rounding prior to jointing.
The nominal values of the internal diameters of centrifugally cast pipes, expressed in millimetres, are
approximately equal to the numbers indicating their nominal size, DN.
The minimum wall thickness for gravity pipes shall be as given in Table 12.
The minimum wall thickness, emin, is equal to the nominal wall thickness, enom, minus 1 mm for DN 80 to
DN 300 and minus 1,2 mm for DN 350.
The minimum wall thickness, emin, and shall be not less than 3 mm and shall be determined using
Equation (2):
PFA × SF × DE
e min = (2)
20 R m + (PFA × SF )
where:
Rm is the minimum tensile strength of ductile iron, in megapascals (Rm = 420 MPa; see Table 5).
NOTE Equation (2) is derived from Barlow's equation, i.e. hoop stress, σ = PD/2t (see 3.40).
For pressure pipes centrifugally cast, the minimum wall thickness, emin, shall not be less than 3 mm. The
nominal wall thickness, enom, is equal to the minimum wall thickness, emin, plus (1,3 + 0,001 DN).
For pressure pipes not centrifugally cast, the minimum wall thickness, emin, shall not be less than 4,7 mm. The
nominal wall thickness, enom, is equal to the minimum wall thickness, emin, plus (2,3 + 0,001 DN).
Flanged pipe shall be classified by PN number. The pressure class of the barrel of the flanged pipes shall be
equal to or greater than a value, in bar, equal to the PN of the flanges. The pressure class of the flanged pipe
barrel to be used for fabricated flanged pipe shall be as indicated in 8.2 for weld-on flanges, screwed-on
flanges and integrally cast flanges.
4.3.2.3 Fittings
The iron wall thickness of fittings for gravity applications is defined by the manufacturer. The thickness shall
be equal to or greater than those of pipes of the same DN.
4.3.3 Length
The standardized lengths of socket and spigot pipes shall be as given in Table 1.
The manufacturer's design lengths, Lu (see 3.36), shall be within a deviation of ±250 mm of the lengths given
in Table 1 and shall be given in their handbook. The actual length, Lu, shall be measured in accordance
with 6.1.3 and shall not differ from the manufacturer's design length by more than the tolerance given in
Table 4. Of the total number of socket and spigot pipes being supplied in each diameter, the percentage of
shorter pipes shall not exceed 10 %.
NOTE 1 Pipes cut for test purposes can be excluded from the 10 % limitation and treated as full length pipes.
NOTE 2 When pipes are ordered on a meterage basis, the manufacturer can determine the required quantity of pipes
to be supplied by the summation of the measured individual pipe laying lengths.
The lengths of flanged pipes shall be as given in Table 2. Other lengths are available by agreement between
the manufacturer and the purchaser.
4.3.3.3 Fittings
Fittings for pressure applications shall be supplied in conformity with ISO 2531.
+50
80 to 1200
−25
Tees
+75
1400 to 2600
−35
Bends 90° (1/4) 80 to 2600 ±(15 + 0,03 DN)
Bends 45° (1/8) 80 to 2600 ±(10 + 0,025 DN)
80 to 1200 ±(10 + 0,02 DN)
Bends 22°30' (1/16) and 11°15' (1/32)
1400 to 2600 ±(10 + 0,025 DN)
Fittings for gravity applications 80 to 2600 ±(15 + 0,03 DN)
The verification of this requirement is normally carried out by visual inspection, but in case of doubt or in
dispute, the deviation shall be measured in accordance with 6.2.
Inspection chambers shall be manufactured either as an integral item or by site assembly of a bottom part and
a vertical part.
Normal access sizes shall be the following: 250, 300, 400, 600 mm.
4.3.6 Manholes
Manholes are composed of a vertical part of DN ≥ 800, a bottom plate, a top plate capable of receiving a
frame and a manhole cover, and 2 or more inlets/outlets fixed to the vertical part.
The number and location of the inlets/outlets shall preserve the hydraulic continuity inside the manhole.
Pipes, fittings and accessories made of ductile iron shall have the tensile properties shown in Table 5.
During the manufacturing process, the manufacturer shall carry out suitable tests to verify these tensile
properties; such tests may be either
a) a batch sampling system whereby samples are obtained from the pipe spigot or, for fittings, from samples
cast separately or integrally with the casting concerned (test bars shall be machined from these samples
and tensile tested according to 6.3), or
b) a system of process control testing (e.g. non-destructive), by which a positive correlation can be
demonstrated with the tensile properties specified in Table 5; testing verification procedures shall be
based on the use of comparator samples having known and verifiable properties. This system of testing
shall be supported by tensile testing in accordance with 6.3.
The hardness of the various components shall be such that they can be cut, tapped, drilled and/or machined
with standard tools. In case of dispute, the hardness shall be measured according to 6.4.
The Brinell hardness shall not exceed 230 HBW for centrifugally cast pipes and 250 HBW for non-centrifugally
cast pipes, fittings and accessories. For components manufactured by welding, a higher Brinell hardness is
allowed in the heat-affected zone of the weld.
4.5.1 General
Ductile iron pipeline systems can be installed in a wide range of external operating environments. These
environments can be characterized according to their aggressivity. For relevant factors, see A.1.
Coatings specified by relevant International Standards are available as specified in A.2. Other coatings are
also available.
Except for the pipes intended only for the transportation of rainwater, domestic waste water in pressure
applications, or non-septic domestic sewerage, the surfaces which can come into contact with the effluents
(internal surface of the socket and external surface of the spigot end) shall be coated with a special coating,
whose chemical resistance should be in conformity with 5.3.
Ductile iron pipeline systems can be used to convey surface water, domestic waste water and/or certain types
of industrial effluents. These internal effluents can be characterized according to their aggressivity. Relevant
factors to be considered are given in B.1.
Linings specified by relevant International Standards are available as specified in B.2. Other linings are also
available.
Except for the pipes intended only for the transportation of rainwater, domestic waste water in pressure
applications, or non-septic domestic sewerage, the chemical resistance should be in conformity with 5.3, and
the abrasion resistance should be in conformity with 5.4.
4.6.1 General
Fittings and accessories shall be normally delivered internally and externally coated.
Ductile iron pipeline systems can be installed in a wide range of external operating environments. These
environments can be characterized according to their aggressivity. For relevant factors, see A.1.
Coatings specified by relevant International Standards are available as specified in A.3. Other coatings are
available.
Ductile iron pipeline systems can be used to convey surface water, domestic waste water and/or certain types
of industrial effluents. These internal effluents can be characterized according to their aggressivity. Relevant
factors for consideration are given in B.1.
Linings specified by relevant International Standards are available as specified in B.4. Other linings are also
available.
Except for the fittings and accessories intended only for the transportation of rainwater, domestic waste water
in pressure applications, or non-septic domestic sewerage, the chemical resistance should be in conformity
with 5.3, and the abrasion resistance should be in conformity with 5.4.
This applies under all normal service conditions, including foreseeable external loads and joint movements
(both angular and radial).
When tested according to 6.5, pipes and fittings for positive pressure applications shall exhibit no visible
leakage, sweating or any other sign of failure.
When tested according to 7.1, pipes and fittings for gravity applications shall exhibit no visible leakage,
sweating or any other sign of failure.
When tested according to 6.6, pipes and fittings for vacuum applications shall exhibit no visible leakage,
sweating or any other sign of failure.
4.9 Marking
All pipes and fittings shall be durably and legibly marked and shall bear at least the following indications:
e) the DN;
List items b) to f) shall be cast-on or cold stamped. List items a) and g) can be applied by any method, e.g.
painted on the castings.
5 Performance requirements
5.1.1 General
All flexible joints for ductile iron pipes and components shall be designed in compliance with the requirements
of 5.1. If the design has been tested and documented by the manufacturer and successfully used for a
minimum of 10 years, the performance of a type test as specified in 5.1.2 for internal pressure, as specified
in 5.1.3 for external pressure and as specified in 5.1.4 for negative internal pressure is only required for
significant changes in design, which could adversely affect the performance of the joint.
Joint designs shall be type tested to demonstrate leaktightness to both internal and external pressure under
the most unfavourable conditions of casting tolerances and joint movements.
There shall be a type test for at least one DN for each of the groupings given in Table 7. One DN is
representative of a grouping when the performances are based on the same design parameters throughout
the size range.
DN groupings 80 to 250 300 to 600 700 to 1000 1100 to 2000 2200 to 2600
If a grouping covers products of different designs and/or manufactured by different processes, the grouping
shall be subdivided.
If, for a manufacturer, a grouping contains only one DN, this DN may be considered as part of the adjacent
grouping provided that it is of identical design and manufactured by the same process.
The type tests shall be carried out in the configuration of maximum design radial gap between the
components to be jointed (smallest spigot together with largest socket).
In the type test, the maximum gap shall be equal to the maximum design radial gap with a tolerance of −05 % .
The internal socket diameter may be machined to achieve this, even if the resulting diameter is slightly outside
the normal manufacturing tolerance.
All joints shall be performance tested with a spigot having an average iron wall thickness (over a distance of
two times DN, in millimetres, from the spigot face) equal to the specified minimum value for the pipe for which
the joint is designed, +100 % . It is permissible to machine the spigot of the pipe bore to achieve the required
thickness.
Restrained flexible joints shall be designed and tested in accordance with ISO 10804.
The leaktightness of joints to positive internal pressure shall be tested as specified in 7.2; the joints shall
exhibit no visible leakage during 2 h, in the two following positions:
a) joint aligned and subjected to a shear: the shear force across the joint, expressed in newtons, shall not be
less than 30 times DN;
b) joint deflected: the test angular deflection shall be the maximum allowable deflection indicated in the
manufacturer's handbook, but not less than 3°30' for DN 80 to DN 300, 2°30' for DN 350 to DN 600, 1°30'
for DN 700 to DN 2600. These minimum deflections do not apply to restrained joints.
The test pressure shall not be less than their allowable test pressure PEA for the joints to be used on pressure
pipelines and 2 bar for the joints to be used on gravity and vacuum pipelines.
The leaktightness of joints to external pressure shall be tested as specified in 7.3; the joints shall exhibit no
visible leakage when subjected to a shear load, expressed in newtons, not less than 30 times DN.
The leaktightness of joints to negative internal pressure shall be type tested as specified in 7.4 at a test
pressure of 0.9 bar below atmospheric pressure (approximately 0,1 bar absolute pressure). The maximum
pressure change during the test period shall not be more than 0,09 bar after 2 h, when tested in the following
two positions:
a) joint aligned and subjected to a shear: the shear force across the joint, expressed in newtons, shall not be
less than 30 times DN;
b) joint deflected: the test angular deflection shall be the maximum allowable deflection indicated in the
manufacturer's handbook, but not less than 3°30' for DN 80 to DN 300, 2°30' for DN 350 to DN 600, 1°30'
for DN 700 to DN 2600. These minimum deflections do not apply to restrained joints.
5.2.1 General
When tested according to 7.5, the pipes shall comply with the requirements of 5.2.2 and 5.2.3.
The diametral stiffness of the pipes shall not be less than the values specified in Table 11. When subjected to
the loads specified in Table 11, the allowable ovalization specified in Table 11 shall not be exceeded.
Ovalization shall be measured and recorded.
In addition, there shall be no damage to the internal and external coatings which could affect their
performance. Local damage to the external coating at the bearing area is acceptable.
NOTE As ductile iron pipes are not subject to creep, the short-term and long-term values of the diametral stiffness
are identical.
After the integrity test of 5.2.2, the pipes shall withstand twice the ovalization attained in the integrity under
service conditions test (5.2.2) without failure of the iron wall.
Except for components intended only for the transportation of rain water, domestic waste water in pressure
applications, or non-septic domestic sewerage, long-term performance of pipes, fittings and joints should be
demonstrated by three-month exposure to an acid solution and to an alkaline solution according to 7.6.
After three months of exposure, the component shall comply with the following requirements:
⎯ thickness of the cement mortar lining shall be within 0,2 mm of the original thickness;
⎯ there shall be no visible cracking, blistering or disbonding of polymeric lining or coating (internal and
external coating of pipes and fittings, which come into contact with effluent during service);
⎯ there shall be no visible cracking on the rubber gasket; its hardness, tensile strength and elongation shall
remain in conformity with the specified values.
However, if the lining has been tested and documented by the manufacturer to a national standard or to an
agreed technical specification and successfully used for a minimum of five years, the performance of the type
test in accordance with 7.6 is only required for significant changes in the coating material/type or formulation,
which can adversely affect the performance of the lining.
When tested in accordance with 7.7, the pipes shall not have an abrasion depth greater than 0,6 mm after
100 000 movements (50 000 cycles) for every type of cement lining, or 0,2 mm for polymeric linings.
In order to test the abrasion resistance of fittings, pipes may be lined as fittings, and tested according to 7.7.
However, if the lining has been tested and documented by the manufacturer to a national standard or to an
agreed technical specification and successfully used for a minimum of five years, the performance of the type
test in accordance with 7.7 is only required for significant changes in the coating material/type or formulation,
which can adversely affect the performance of the lining.
6.1 Dimensions
Pipes with sockets and spigot ends shall be measured at their spigot by means of a circumferential tape for
compliance with the outer diameter tolerance. They can also be verified by means of pass-fail gauges.
In addition, the pipes shall be visually inspected at their spigot for compliance with the ovality tolerance and, in
case of doubt, checked by measuring the minimum and maximum axes. This control may also be carried out
by means of pass-fail gauges.
The frequency of testing is related to the system of production and quality control used by the manufacturer.
Pipe wall thickness compliance shall be demonstrated by the manufacturer; a combination of various means
may be used, such as:
⎯ direct wall thickness measuring or gauging by suitable equipment, such as mechanical or ultrasonic
equipment. The frequency of testing is related to the system of production and quality control used by the
manufacturer.
The length of centrifugally cast pipes with sockets and spigot ends shall be measured by means of suitable
equipment:
⎯ on the first pipe cast from a new mould, for full length pipes;
⎯ on the first cut pipe, for pipes which are systematically cut to a predetermined length.
The pipe shall be rolled on two supports or rotated around its axis on rollers, which in each case are
separated by at least two thirds of the standard pipe length.
The point of maximum deviation from the true axis shall be determined and the deviation measured at that
point shall not exceed the limit fixed in 4.3.4.
6.3.1 Sampling
6.3.1.1 General
The thickness of the sample and the diameter of the test bar shall be as indicated in Table 8.
A sample shall be cut from the spigot of the pipe. This sample may be cut perpendicular to or parallel with the
pipe axis. But, in case of dispute, the sample cut parallel to the axis shall be used.
Samples shall be taken, at the manufacturer's discretion, either from an integrally cast sample, from a sample
attached to the casting, or from a sample cast separately. In the latter case, it shall be cast from the same
metal as that used for the casting. If the casting is subjected to heat treatment, the sample shall be subjected
to the same heat treatment.
A test bar shall be machined from each sample to be representative of the metal at the mid-thickness of the
sample, with a cylindrical part having the diameters given in Table 8. If the specified diameter of the test bar is
greater than 60 % of the measured minimum thickness of the sample, a test bar with a smaller diameter may
be machined, or another sample cut in a thicker part of the pipe. Other test bar shapes complying with
International Standards or national standards are permitted.
The test bars shall have a gauge length at least five times the nominal test bar diameter. The ends of the test
bars shall suit the testing machine.
The surface roughness of the machined gauge length of the test bar shall be such that Rz ≤ 6,3 µm.
Two methods of measuring the tensile strength may be used at the manufacturer's discretion:
a) method A:
produce the test bar to a nominal diameter ±10 %, measure the actual diameter before the test with an
accuracy of ±0,01 mm and use this measured diameter to calculate the cross-sectional area and the tensile
strength, or
produce the test bar to a nominal area, So, within a specified tolerance on the diameter (see Table 8) and use
the nominal area to calculate the tensile strength.
Test bar,
Test bar, method B
method A
Nominal Nominal Tolerance on
Type of casting Nominal area
diameter diameter diameter
So
mm mm2 mm mm
The tensile testing machine shall have holders or grips to attach to the test bar ends and positively transfer the
test load axially. The testing machine shall have a force range suitable for testing the bars to failure whilst
indicating the load applied.
The rate of stressing shall be as constant as possible within the limits of 6 N/mm2 to 30 N/mm2 per second.
The tensile strength shall be calculated by dividing the maximum force sustained by the test bar by the
cross-sectional area of the test bar before testing. The elongation shall be measured by piecing together the
broken parts of the test bar and taking the ratio of the extended gauge length to the original gauge length.
Alternatively, the elongation may be measured directly by means of an extensometer.
Test results shall comply with Table 5. If they do not comply, the manufacturer shall:
a) in the case where the metal does not achieve the required mechanical properties, investigate the reason
and ensure that all castings in the batch are either reheat treated or rejected; castings which have been
reheat treated are then retested in accordance with 6.3;
b) the case of a defect in the test bar, carry out a further test. If it passes, the batch is accepted; if not, the
manufacturer has the option to proceed in accordance with a) above.
The frequency of testing is related to the system of production and quality control used by the manufacturer
(see 4.4.1). The maximum batch sizes shall be as given in Table 9.
When Brinell hardness tests are carried out (see 4.4.2), they shall be performed either on the casting in
dispute or on a sample cut from the casting. The surface under test shall be suitably prepared by slight local
grinding, and the test shall be carried out in accordance with ISO 6506-1 using a ball of 2,5 mm, 5 mm
or 10 mm in diameter.
6.5 Works leaktightness test of pipes and fittings for pressure applications
6.5.1 General
Pipes and fittings shall be tested in accordance with 6.5.2 and 6.5.3, respectively. The test shall be carried out
on all pipes and fittings before the application of their external and internal coatings, except for the metallic
zinc coating of pipes which may be applied before the test.
The test apparatus shall be suitable for applying the specified hydrostatic test pressures to the pipes and/or
fittings. It shall be equipped with an industrial pressure gauge with an error limit of ±3 %.
The internal hydrostatic pressure shall be raised until it reaches the works hydrostatic pressure equal to the
pressure class and limited to the pressure of preferred classes. Higher pressures are permissible.
The total duration of the pressure cycle shall not be less than 15 s, including 10 s at test pressure. Visual
inspection shall be made during or immediately after the pressure test.
At the discretion of the manufacturer, these pipes and fittings shall be submitted to a hydrostatic pressure test,
or to an air test.
When the air test is carried out, it shall be with an internal pressure of at least 1 bar and a visual inspection
time of not less than 10 s; for leak detection, the castings shall be either uniformly coated on the external
surface by a suitable foaming agent or submerged in water.
Table 10 — Works test pressure for pipes not centrifugally cast and fittings
80 to 300 25b
350 to 600 16
700 to 2600 10
a The works hydrostatic test pressure is less than for pipes because of the difficulty providing sufficient restraint to high internal
pressure during test.
b For pipes and fittings with PN 10 flanges, 16 bar.
6.6 Works leaktightness test of pipes and fittings for vacuum applications
All the pipes and fittings shall be subjected to an air test with an internal pressure of at least 1 bar and an
inspection time not less than 10 s for fittings and 1 min for pipes. For leak detection, pipes and fittings shall be
submerged in water or uniformly coated on their external surface by a suitable foaming agent.
7 Type tests
Ductile iron pipes, fittings, inspection chambers and manholes, equipped with appropriate end restraints, shall
be filled with water and suitably vented of air. The internal hydrostatic pressure shall then be raised to 2 bar
and maintained constant for at least 2 h, during which a visual inspection for leak detection shall be carried out.
The test shall be carried out at ambient temperature on coated products.
Where convenient, these type tests may be performed at the same time as those described in 7.2 for joints.
This type test shall be carried out on an assembled joint comprising two pipe sections each at least 1 m long
(see Figure 1).
The test apparatus shall be capable of providing suitable end restraints whether the joint is in the aligned
position or deflected, or subjected to a shear load. It shall be equipped with a pressure gauge having an
accuracy of ±3 %.
The shear load, W, shall be applied to the spigot by means of a V-shaped block with an angle of 120°, located
at approximately 0,5 × DN, in millimetres, or 200 mm from the socket face (whichever is the greater); the
socket shall bear on a flat support. The load, W, shall be such that the resultant shear force, F, across the joint
is equal to the value specified in 5.1.2, taking into account the mass, M, of the pipe and its contents and the
geometry of the test assembly as given in Equation (3):
F × c − M (c − b)
W = (3)
c−a
The test assembly shall be filled with water and suitably vented of air. The pressure shall be raised steadily
until it reaches the test pressure given in 5.1.2; the rate of pressure increase shall not exceed 1 bar/s. The test
pressure shall be kept constant within ±0,5 bar for at least 2 h during which the joint shall be thoroughly
inspected every 15 min.
This type test assembly, which applies only to push-in flexible joints, shall comprise two joints made with two
pipe sockets connected together and one double-spigot piece so as to create an annular chamber allowing for
the testing of one joint under internal pressure and one joint under external pressure (see Figure 2).
The test assembly shall then be filled with water and suitably vented. The pressure shall be steadily increased
until it reaches the test pressure in 5.1.3 and then kept constant within ±0,1 bar for at least 2 h, during which
the internal side of the joint subjected to external pressure shall be thoroughly inspected every 15 min.
The test assembly and test apparatus shall be as given in 7.2 with the pipe sections axially restrained to
prevent them moving towards each other.
The test assembly shall be empty of water and shall be evacuated to a negative internal pressure of 0,9 bar
(see 5.1.4) and then isolated from the vacuum pump. The test assembly shall be left under vacuum for at least
2 h, during which the pressure shall not have changed by more than 0,09 bar. The test shall begin at a
temperature between 5 °C and 40 °C. The temperature of the test assembly shall not vary by more than 10 °C
for the duration of the test.
The test shall be carried out on a pipe section (500 ± 20) mm long, cut from a finished pipe barrel. The pipe
section shall be placed on a support approximately 200 mm wide and 600 mm long, having a V shape with an
angle between 170° and 180° (see Figure 3). The load shall be applied at the pipe crown through a loading
beam approximately 50 mm wide and 600 mm long. Both the V support and the loading beam shall be
covered with a sheet of elastomer with a thickness of (10 ± 5) mm and a hardness greater than or equal
to 50 IRHD. Before the test, the pipe section shall be immersed in water at ambient temperature for
approximately 24 h.
The load shall be increased steadily until it reaches the test load corresponding to the minimum diametral
stiffness given in Table 11 and kept constant for 1 min. The vertical deflection of the pipe section shall be
measured and recorded and the calculated ovalization shall not exceed the allowable value given in Table 11.
In addition, the pipe section shall be visually inspected in order to check that there is no damage to the
external and internal coatings, which can affect their function.
The load shall then be increased until the vertical deflection reaches twice the value previously measured. The
load shall be kept constant for 1 min.
Minimum Allowable
diametral Test load pipe ecalc
DN stiffness ovalization
S F
kN/m2 kN/m % mm
Gravity pipe
80 400 30,9 1,5 2,9
100 227 25,3 1,8 2,9
125 123 21,4 2,3 2,9
150 74 17,9 2,7 2,9
200 32 10,5 2,8 2,9
250 32 13,4 2,9 3,6
300 32 16,5 3 4,3
350 32 19,8 3,1 4,9
Pressure pipe
80 856 61,8 1,40 3,7
100 481 50,7 1,70 3,7
125 271 42,1 2,05 3,8
150 163 35,6 2,45 3,8
200 84 29,5 3,00 4,0
250 50 21,5 3,00 4,1
300 34 17,4 3,00 4,3
350 31 19,2 3,10 4,9
400 30 21,8 3,20 5,5
450 22 18,4 3,30 5,5
500 17 16,2 3,40 5,6
600 16 19,3 3,60 6,6
700 15 22,6 3,80 7,5
800 15 27,1 4,00 8,6
900 15 29,5 4,00 9,5
1000 14 31,9 4,00 10,5
1100 14 34,3 4,00 11,4
1200 14 36,7 4,00 12,4
1400 14 42,5 4,00 14,4
1500 14 44,9 4,00 15,3
1600 13 47,4 4,00 16,3
1800 13 52,2 4,00 18,2
2000 13 58,0 4,00 20,2
2200 13 62,9 4,00 22,1
2400 13 67,8 4,00 24,0
2600 13 73,5 4,00 26,0
NOTE 1 The ovalization is 100 times the measured vertical deflection, in millimetres (caused by the applied load)
divided by the measured pipe external diameter in millimetres.
F
S = 0,019 (4)
Y
where
3
E×I E ⎛ e stiff ⎞
S = 1 000 3
= 1 000 × ⎜ ⎟ (5)
D 12 ⎝ D ⎠
where
I is the second moment of area of the pipe wall per unit length, in millimetres, to the third power;
estiff is the pipe wall thickness equal to the average of the minimum pipe wall thickness and the nominal pipe wall
thickness, in millimetres;
where
⎯ a pipe section with cement mortar lining, including a socket with its internal coating,
⎯ a rubber gasket.
The size of the pipe section and of the spigot end of the fitting shall be DN 200. The length of the pipe section
shall be (0,5 ± 0,1) m, and the length of the spigot of the fitting shall be (0,4 ± 0,1) m. The surface of cement
mortar lining shall be cleaned to remove any loose particles. Before testing, the pipe section shall be
preconditioned by immersion in water at ambient temperature for approximately 24 h. After preconditioning,
the initial thickness of the cement mortar lining shall be measured by an electromagnetic gauge with precision
to 0,1 mm. The measurements shall be located at 15 regularly spaced points along each longitude line,
respectively at 5 o'clock and 7 o'clock.
⎯ the first assembly shall be filled to mid-height with a solution of sulfuric acid at pH 3;
⎯ the second assembly shall be filled to mid-height with a solution of sodium hydroxide at pH 13.
The assemblies shall be tested with a recirculating solution at an approximate flow rate of (1 ± 0,5) l/min. The
test temperature shall be (18 ± 2) °C.
The Ca++ concentration shall be regularly monitored and adjusted by addition of soft water or deionized water
such that the concentration does not exceed 200 mg/l.
At the end of the three-month test period, the test assemblies shall be dismantled, rinsed and cleaned. At the
location of lining thickness measured previously after preconditioning, the lining thickness shall be measured
again. The thickness reduction shall be calculated and compared to the requirement listed in 5.4.
The necessary observations and measurements shall be carried out on the cement mortar lining, on the
polymeric coatings and on the rubber gasket, to verify compliance with 5.4.
The test shall be carried out on a 1 m long DN 200 pipe sample, closed at both ends after enclosing the test
material. The pipe section shall be internally brushed in order to remove the loose sand and loose mortar
parts using a hard plastic brush and cleaned with compressed air.
Before testing, the cement mortar lined pipe section shall be immersed in water at ambient temperature for
approximately 24 h.
The cement mortar lining thickness shall be measured along a longitudinal line located at 6 o'clock
at 15 regularly spaced measurement points on each line excluding 150 mm at both ends. The location of the
measurement points shall be identical before and after testing, preferably using a template. The thickness
shall be measured using an electromagnetic measuring device.
The test material shall contain natural siliceous gravel to reach a level of (38 ± 2) mm above the invert with
enough water to reach the same level. The gravel particle shall be of the rounded and not crushed type and
shall have a size between 2 mm and 10 mm with an average of approximately 6 mm.
The pipe sample shall be fixed horizontally on a testing device capable of inclining the sample successively to
an angle of +22,5° and −22,5° every 3 s to 5 s.
After 100 000 movements (or 50 000 cycles), the test assemblies shall be dismantled, rinsed and cleaned. On
the pipe sample, the depth of abrasion of the cement lining shall be calculated as the difference between the
average thickness on 15 points before and after testing.
The test shall be carried out on a 1 m long DN 200 pipe sample, closed at both ends after enclosing the test
material.
The polymeric lining thickness shall be measured along a longitudinal line located at 6 o'clock at 15 regularly
spaced measurement points on each line excluding 150 mm at both ends. The location of the measurement
points shall be identical before and after testing, preferably using a template. The thickness shall be measured
using an electromagnetic measuring device.
The test material shall contain natural siliceous gravel to reach a level of (38 ± 2) mm above the invert with
enough water to reach the same level. The gravel particle shall be of the rounded and non-crushed type and
shall have a size between 2 mm and 10 mm with an average of approximately 6 mm.
The pipe sample shall be fixed horizontally on a testing device capable of inclining the sample successively to
an angle of +22,5° and −22,5° every 3 s to 5 s.
After 100 000 movements (or 50 000 cycles), the test assemblies shall be dismantled, rinsed and cleaned. On
the pipe sample, the depth of abrasion of the polymeric lining shall be calculated as the difference between
the average thickness on 15 points before and after testing.
8 Tables of dimensions
The dimensions of the preferred pressure class and gravity socket and spigot pipes are as given in Figure 5.
Wall thicknesses for pressure and gravity pipes are given in Table 12.
Key
DE nominal external diameter of spigot, in millimetres;
enom nominal wall thickness, in millimetres;
L2 depth of socket, in metres;
Le = Ltot − Li laying length, in metres;
Li maximum insertion depth as given by the manufacturer, in metres;
Ltot total length, in metres;
Lu = Ltot − L2 standardized length, in metres.
External
DN diameter Pressure
Gravity sewer
DE sewer
mm
80 98 4,4 3,4
100 118 4,4 3,4
125 144 4,5 3,4
150 170 4,5 3,4
200 222 4,7 3,4
250 274 4,9 4,1
300 326 5,1 4,8
350 378 5,7 5,5
400 429 6,3
450 480 6,4
500 532 6,5
600 635 7,5
700 738 8,5
800 842 9,6
900 945 10,6
1000 1048 11,6
1100 1152 12,6
1200 1255 13,6
1400 1462 15,7
1500 1565 16,7
1600 1668 17,7
1800 1875 19,7
2000 2082 21,8
2200 2288 23,8
2400 2495 25,8
2600 2702 27,9
8.2.1 Collars
Figure 6 — Collar
DN values are those from DN 80 to DN 2600. The angles, α, of the bends shall be given in the manufacturer's handbook.
DN values are those from DN 100 to DN 500 for the body and from dn 80 to dn 250 for the branch. The various
combinations DN × dn, the types of ends (socket or spigot) and the angle, α, of the branch shall be given in the
manufacturer's handbook.
DN values are those from dn 100 to dn 250 for connection to pipes from DN 200 to DN 2600. The type of end (socket or
spigot) for connection with different pipe materials shall be given in the manufacturer's handbooks, as well as the angle of
the branch and the shape of the hole to be cut in the pipe (circular, square or rectangular).
DN values are those from DN 80 to DN 800. The type of ends (socket or spigot) shall be given in the manufacturer's
handbooks as well as the shape and dimensions of the access branch.
DN values are those from DN 150 to DN 1400. The shape and dimensions of the hole to be cut in the pipe shall be given
in the manufacturer's handbooks, as well as the method of connection to the pipe.
The types and dimensions of these fittings are defined in ISO 2531.
External protection
⎯ resistivity;
⎯ pH;
⎯ stray currents;
⎯ corrosion cells;
⎯ contamination.
A.2 Centrifugally cast pipe coatings for protection against aggressive external
operating environments
⎯ zinc rich paint with finishing layer, in accordance with ISO 8179-2;
For other types of pipe coatings and their repair methods, see national standards or pipe manufacturers.
A.3 Fittings and accessory coatings for protection against aggressive external
operating environments
⎯ zinc rich paint with finishing layer, in accordance with ISO 8179-2;
For other types of fittings and accessory coatings and their repair methods, see national standards or pipe
manufacturers.
Internal protection
⎯ pH;
⎯ temperature;
⎯ hydrogen sulfide;
⎯ sulfate SO42;
⎯ aggressive CO2;
⎯ chloride Cl−;
⎯ magnesium Mg2+;
⎯ ammonium NH4+.
B.2 Centrifugally cast pipe linings for protection against aggressive internal effluent
For other types of lining and their repair methods, see national standards or pipe manufacturers.
B.3 Socket and spigot coating for protection against aggressive internal effluent
⎯ zinc rich paint with finishing layer, in accordance with ISO 8179-2.
For other types of coatings and their repair methods, see national standards or pipe manufacturers.
B.4 Fitting and accessory linings for protection against aggressive internal effluent
For other types of lining and their repair methods, see national standards or pipe manufacturers.
Allowable pipeline pressures relationships are specified in 4.2.3. The calculation of the minimum pipe wall
thickness, as a function of allowable working pressure (PFA) and pipe external diameter (DE), is specified
in 4.3.2.1.2. Table C.1 lists the relevant results.
Minimum
DN Pressure DE PFA PMA PEA
thickness
class
mm mm bar bar bar
80 C40 3 98 88 106 111
100 C40 3 118 73 88 93
125 C40 3 144 60 72 77
150 C40 3 170 50 60 65
200 C40 3,2 222 41 49 54
250 C30 3,3 274 34 41 46
300 C30 3,5 326 30 36 41
350 C30 4 378 30 36 41
400 C30 4,6 429 30 36 41
450 C25 4,6 480 27 32 37
500 C25 4,7 532 25 30 35
600 C25 5,6 635 25 30 35
700 C25 6,5 738 25 30 35
800 C25 7,5 842 25 30 35
900 C25 8,4 945 25 30 35
1000 C25 9,3 1048 25 30 35
1100 C25 10,2 1152 25 30 35
1200 C25 11,1 1255 25 30 35
1400 C25 13,0 1462 25 30 35
1500 C25 13,9 1565 25 30 35
1600 C25 14,8 1668 25 30 35
1800 C25 16,6 1875 25 30 35
2000 C25 18,5 2082 25 30 35
2200 C25 20,3 2288 25 30 35
2400 C25 22,1 2495 25 30 35
2600 C25 24,0 2702 25 30 35
[1] ISO 4179:2005, Ductile iron pipes and fittings for pressure and non-pressure pipelines — Cement
mortar lining
[2] ISO 6708:1995, Pipeworks components — Definition and selection of DN (nominal size)
[4] ISO 8179-1, Ductile iron pipes — External zinc-based coating — Part 1: Metallic zinc with finishing layer
[5] ISO 8179-2, Ductile iron pipes — External zinc coating — Part 2: Zinc rich paint with finishing layer
[6] ISO 8180, Ductile iron pipelines — Polyethylene sleeving for site application
[9] ISO 16132, Ductile iron pipes and fittings — Seal coats for cement mortar linings