This document provides information on wire rope products from Usha Martin Limited. It discusses the key components of wire rope, fundamental constructions, pulley bending ratios, proper storage, handling and lubrication techniques. Wire rope characteristics such as bend fatigue resistance, abrasion resistance, and benefits of compacted and plasticated constructions are also summarized. Usha Martin produces a wide range of steel wire ropes used in various applications worldwide.
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Rope handbook
1. WIRE ROPE
USHA MARTIN LIMITED
2A, Shakespeare Sarani, Kolkata 700 071, India
Phone : 00 91 33 2282 3985, 39800300,
Fax : 00 91 33 39800500/400
E mail : exports@ushamartin.com
www.ushamartin.com
2. FOREWORD
Usha Martin Limited is a Speciality Steel and Steel
product focused group with diverse product range in
both steel as well as wire rope.
It is one of the largest wire rope manufacturer in the
world. It is also the only wire rope company in the
world that has a totally integrated business model to
convert iron-ore into steel wire ropes as well as build
its own wire-drawing and rope-making machinery.
The steel wire ropes ranges from 1.5 mm to 140mm
in size, 1370 to 2160 N/mm2 in grade and
encompassing all constructions and all configurations
like Non-Compacted, Compacted, Plasticated, Flattened
Strand, Locked Coil ropes and slings.
Usha Martin ropes conforms to all specifications in
the world, viz. ISO, DIN, BS, IS, API, EN, AS, GOST,
JIS and approved by all leading organisations, viz.
ABS, API, DNV, LLOYDS, NKK.
Usha Martin’s rope works is one of the cleanest in the
world accreditated with TPM excellence award from
Japan Institute of Plant Maintenance.
It is one of the very few companies that has approval
by OTIS for its worldwide Elevator rope supply.
No part of this Book may be reproduced, scanned, stored in a retrieval system or Usha Martin Steel wire ropes finds place in every
transmitted in any form or by any means, electronic, mechanical, photocopying, recording corner of the Globe and has presence in almost all
or otherwise, or reproduced on or by any disc, tape, perforated media or any other
storage device or method without the permission in writing from Usha Martin Limited. application of ropes.
4. WIRE ROPE COMPONENTS ROPE SIZE
n WIRE
n STRAND 32 1 2
n CORE
STRAND
CORE
CORRECT
WIRES
Measure the circle just touching the extreme outer
limits (crown) of the strands.
32 1 2
KING WIRE
WIRE ROPE
INCORRECT
4 5
5. FUNDAMENTAL CONSTRUCTIONS FUNDAMENTAL CONSTRUCTIONS
n Inner layer having half the number of wires
as the outer layer
n Small filler wires, equal in number to the
FILLER WIRE inner layer, are laid in the valleys of the inner
CROSS LAY layer.
n One diameter of wire in the inner layer.
n Two diameters of wire alternating large and
WARRINGTON small in the outer layer.
EQUAL LAY n The large outer-layer wires rest in the valleys
and the smaller ones on the crowns of the
inner layer.
n Single-Wire centre with six wires of the
same diameter.
SINGLE LAYER n Combination of above constructions.
Eg Seale-Filler, Warrington-Seale etc.
COMBINED
n Equal number of wires in each layer.
n All wires in each layer are of the same
diameter.
SEALE
n Large outer wires rest in the valley between
the small inner wires.
6 7
6. LAY IDEAL PULLEY GROOVE
Direction of Wire & Strand Helix Greater contact area between the rope and the pulley reduces
abrasion and enhances service life.
WRONG
RIGHT HAND REGULAR LAY (RHRL/RHO/sZ)
LEFT HAND REGULAR LAY (LHRL/LHO/zS)
Sheave groove too narrow
WRONG
RIGHT HAND LANGS LAY (RHLL/RHL/zZ)
Sheave groove too wide
LEFT HAND LANGS LAY (LHLL/LHL/sS)
RIGHT
ALTERNATE LAY (COMBINATION OF LANGS & REGULAR)
Sheave groove correctly supporting the
rope for 33% of its circumference
SPECIAL ALTERNATE LAY (2 LANGS 1 REGULAR)
8 9
7. PULLEY / ROPE BENDING RATIO
(D/d RATIO)
Sl. D : d Ratio
Construction
No. Recommended Minimum
Rope Dia (d) 1 6x7 (6-1) 64 42
2 6x19S (9-9-1) 48 32
3 6x26SW (10-5+5-5-1) 45 30
4 6x25F (12-6F-6-1) 39 26
5 6x31SW (12-6+6-6-1) 39 26
6 6x37SF (12-12-6F-6-1) 39 26
7 6x36SW (14-7+7-7-1) 33 22
8 6x43SF (14-14-7F-7-1) 33 22
9 6x50SFS (14-14-7F-7-7-1) 33 22
10 6x41SW (16-8+8-8-1) 30 20
11 6x49SW (16-8+8-8-8-1) 30 20
12 6x49SF (16+16+8F-8-1) 30 20
13 6x46SW (18-9+9-9-1) 27 18
14 6x52SW (18-9+9-9/6-1) 27 18
Sheave Dia (D)
15 6x55SF (18-18-9F-9/6-1) 27 18
16 8x19S (9-9-1) 39 26
17 8x26SW (10-5+5-5-1) 36 24
18 8x25F (12-6F-6-1) 33 22
19 8x31SW (12-6+6-6-1) 33 22
20 8x37SF (12-12-6F-6-1) 33 22
21 8x36SW (14-7+7-7-1) 29 19
22 8x50SFS (14-14-7F-7-7-1) 29 19
23 17x7 (11:6-1) 52 34
24 18x7 (12:6-FC) 52 34
25 19x7 (12:6-1) 52 34
26 34x7 (17:11/6-FC) 45 30
27 35x7 (16:6+6-6-1) 61 40
Note: 28 6x25FS (12/12/ ) 48 32
The ratios are based on Max. rope speed of 60 meters/ min. For each 29 6x8FS (7/ ) 73 48
increase of 30 mtrs/min. in excess of 60 meters per min., add 5% to the 30 6x28FS (15/12/ ) 45 30
drum diameter. 31 Locked Coil Winding Rope 152 100
10 11
8. FLEET ANGLE SPOOLING/ANCHORAGE OF
ROPE ON DRUM
n Ropes are supplied with zero internal torque
n Improper spooling induces torque in rope, reducing
the rope life.
A B
L R L R
Angle
of Fleet
OVERWIND UNDERWIND
Left to Right Right to Left
USE RIGHT LAY ROPE USE RIGHT LAY ROPE
Centre line
of Reel
C D
L R L R
Centre Line
of Sheave
OVERWIND UNDERWIND
Right to Left Left to Right
Note:
USE LEFT LAY ROPE USE LEFT LAY ROPE
Recommended angle
Grooved drum : α ≤ 2.5
O
Flat drum : 0.5 ≤ α ≤ 1.5
O O
12 13
9. ROPE CUTTING PROCEDURE ROPE CLAMPING
n Seizing
n Twisting
n Cutting
The Right Way to Clip Wire Rope
The Wrong Way to Clip Wire Rope
Note:
Seizing wire recommendation
- for ungalvanised rope – use annealed wire
- for galvanised rope – use soft, zinc-coated wire. Note:
- Diameter of wire: 8 - 24 mm = 1 mm Improper fixing of clamps may lead to safety hazards.
26 - 36 mm = 1.6 mm For proper clamping practice, refer applicable standards or OEM
38 - 56 mm = 2 mm recommendations.
- Recommended seizing length = 1 x d min or 10 wraps
14 15
10. IN-USE LUBRICATION IN-USE LUBRICATION
n Usha Martin Ropes are supplied with special lubricant
n Periodic Lubrication during usage is necessary to derive
enhanced performance.
PAINTING SPRAY NOZZLE
CONTINUOUS BATH DRIPPING
As Manufactured + In-service Lube
140%
As Manufactured
100%
Life Enhancement
In-use lubrication pays rich dividend
POURING SWABBING
16 17
11. STORAGE HANDLING – THE RIGHT WAY
n Must be stored in a well ventilated shed. n Use spindle through the reels for loading / unloading or put
the rope on a swift with brake arrangement.
n Free from moisture, dust and fumes.
n Allow clearance for free rotation of reel when the rope end
n Suitable lubricant to be applied every
is pulled.
3 months to the outer layers.
n Maintain constant tension during haul off.
n Reel containing ropes to be rolled through 90 degree
after every 3 months n Prevent crossing of rope laps on the reel.
n Protect wooden reels from the attack of termites. n Avoid possible kink, which is a permanent damage to a rope.
n In no case the reels should be put on ground or
uncemented floor.
COVER / SHED
GROUND CLEARANCE
18 19
12. HANDLING – THE RIGHT WAY WIRE ROPE CHARACTERISTICS
BEND FATIGUE & ABRASION RESISTANCE
Rope resistance to abrasion
Rope resistance to bending
6 6x7
LE S T
AS TE
9 T 6 x 19S
EA
RE GR
10 SI
ST N 6 x 21F
AN S IO
12 CE RA Flattened
TO AB
BE Strand
12 ND
IN 6 25FW
TO G
12 E FA
TIG
NC 6 x 31WS
14 TA UE
S IS
RE GR
EA
6 x 36WS
16 T TE
S
L EA ST 6 x 49WS
18
6 x 61WS
n More wires – better fatigue resistance
n Less wires – better abrasion resistance
20 21
13. WIRE ROPE CHARACTERISTICS WIRE ROPE CHARACTERISTICS
COMMONLY USED ROPE (Non-compacted) COMPARISON OF ROTATION RESISTANCE
CHARACTERISTICS SIMPLY STATED
n More wires in the outer strand (14 for 36WS) will improve
bend fatigue 6 x 19 Class
Rotation
(deg/m) 8 x 19 Class
n Less wires in the outer strands (9 for 19S) improve
wear/abrasion resistance characteristics
Hyflex & Powerform18
n Steel core (IWRC) resists drum crushing better than
fibre core Hyflex & Powerform 35
0
n Langs lay resists interference at drum better than Rope Tension 15% 20%
ordinary lay x MBL x MBL
Abrasion Resistance
Comparison of outer wire sizes for 25 mm diameter rope,
as illustration
6x7 6 outer wires 2.54mm Parallel closed ropes (eg. Powerform 8PC)
6 x 19S 9 outer wires 2.11mm 6/8 strand ropes (eg. Hyflex 6)
Turn
6 x 25F 12 outer wires 1.70mm
Low rotation ropes (eg. Hyflex 18)
6 x 36 14 outer wires 1.49mm
6 x 41 16 outer wires 1.34mm Rotation resistant ropes
(eg. Powerform 35)
Load
22 23
14. WIRE ROPE CHARACTERISTICS WIRE ROPE CHARACTERISTICS
COMPACTED ROPES High Abrasion Resistance
CHARACTERISTICS SIMPLY STATED
Internal Contacts
External Contacts
n Increased breaking force Conventional Compacted
n Increased performance Line Contact Surface Contact
n Improved characteristics
l Improved wear resistance High Crushing Resistance
l Improved crushing resistance
l Improved Bend Fatigue resistance n At cross-over points due to
high fill -factor
High Breaking Load per unit area
n At lower layers in multilayer
operation
Compacted rope = Conventional rope minimum
minimum breaking force breaking force Greater bend fatigue resistance
20mm Hyflex (conventional) versus
20mm Hyflex (conventional) versus 20mm 20mm Powerform 6 1960 N/mm2
Powerform 6 1960 N/mm2
200000
Cycles to failure
375 146000
150000
300
70000
225 100000
150 335 kN
279 kN 50000
75
0 0
Hyflex 6 Powerform 6 Hyflex 6 Powerform 6
24 25
15. WIRE ROPE CHARACTERISTICS WIRE ROPE CHARACTERISTICS
PLASTICATED ROPE PLASTICATED ROPE
CHARACTERISTICS SIMPLY STATED CHARACTERISTICS SIMPLY STATED
(Cushion Core – Compacted outer strands) (Plastic Valley Filled)
n Plastic impregnation of core (IWRC) n Full plastic impregnation
n Greater resistance to drum crushing n Reduces wire contact stress & interstrand nicking
n Increased abrasion resistance n Retains lubrication inside & does not require
in-service lubrication
n Smoother exteriors and greater surface area resulting in
reduced sheave wear n Prevents ingress of solid abrasives & reduces
internal corrosion
n Reduced IWRC and outer-strand nicking & crosscutting
n Provides greater and better wear & abrasion resistance
n High fatigue life
n Minimizes bend stress over sheaves and increases
Typical Example fatigue life
Impregnation of IWRC n Ideally suitable for mining application
Typical Example
Full Impregnation of
Comparison of bend fatigue illustration the rope
250
Rope failure
Discard level
200
Comparison of service life (mining application)
Cycles to failure (000's)
150
250% Plastic
Valley-Filled
6
8P
(compacted strands)
100
POWERFORM
HYFLEX 6x29Fi
POWERFORM
HYFLEX 6x36
HYFLEX 6x19
HYFLEX 8P
175% Compacted
Fatigue Life
50 Rope
100% Normal
0 Rope
Note:
n Our suffix is ‘P’
PVF Compacted Non-compacted
n Colour of plastication is indicated in orange
(6/8 outer strands)
26 27
17. DISCARD CRITERIA RECOMMENDED
DO’S & DON'TS
n For single-layer construction, if the reduction in diameter DO’S
is greater than 8% (eg. 6x7).
n Lubricate ropes with good quality acid free and moisture
n For multilayer construction, if the reduction in diameter free lubricant.
is greater than 5% (eg. 6x19, 6x36 etc).
n Regularly inspect the sheaves, rollers or pulleys - the
n Total no. of visible broken wires exceed 10% of total life of a rope largely depends on their conditions.
no. of wires in the rope, in a length of 8 x dia. of rope
n Inspect ropes and fittings/terminations periodically.
or 3 or more adjacent broken wires in a strand.
DON’TS
n Evidence of considerable plastic wear or surface
embrittlement. n Do not allow ropes in store to deteriorate
n Localised distortion, damage or kink, bird-caging, n Do not mishandle ropes when uncoiling or unreeling &
crushing. allow kinks to form.
n Localised diameter reduction or lay variation associated n Do not use Langs lay with a swivel
with waviness. n Do not use a rope with too large groove diameter on
n Collapsed core or one strand broken coupled with wire drums and pulleys.
looseness and bulging. n Do not cut a rope without seizing.
n Corrosion / chain pitting & associated fatigue of wires. n Do not use rope which is not sufficiently flexible for the
n Damage due to heat / fire. size of drum or pulley.
n Rope has been subjected to severe shock load or overload n Do not load the rope beyond its safe working load.
due to some accident with equipments. Reduction of safety factor may jeopardise not only rope,
but also equipment, job and men.
n End-fitting / attachments damaged or cracked or
deformed or worn out.
Note: Note:
The inspector should also refer International Standards like ISO 4309 and BS 6570 or Remember - Care in handling , installation, and careful inspection gives more life and
any other relevant standard for the purpose, as a tool, for discarding a wire rope. enormous dividends.
30 31
33. SPIRAL STRANDS SPIRAL STRANDS
NOMINAL APPROX. MINIMUM BREAKING FORCE NOMINAL APPROX. MINIMUM BREAKING FORCE
CONSTR. ROPE DIA MASS 1570 N/mm2 CONSTR. ROPE DIA MASS 1570 N/mm2
1770 N/mm2 1770 N/mm2
mm Kg./100m kN kN mm Kg./100m kN kN
1x19 11 58.7 99.9 113 1 x 91 40 771 1280 1450
13 82.0 140 157 42 850 1410 1590
14.5 102 174 196 45 976 1620 1830
16 124 211 238 48 1110 1850 2080
19 175 298 336 51 1250 2090 2350
1x37 22 234 390 439 54 1400 2340
26 327 544 614 57 1570 2610
29 407 677 763 60 1730 2890
64 1970 3280
32 495 824 930
66 2100 3490
35 593 986
38 698 1160 1 x 127 68 2230 3710 4180
42 853 1420 ... 547 71 2430 4040 4560
74 2640 4390 4950
1x61 20 193 322 363
77 2860 4750 5360
22 234 389 439 80 3080 5130 5790
26 327 544 613 84 3400 5660 6380
29 406 676 762 87 3650 6070 6840
32 495 823 928 90 3900 6500 7320
35 592 985 1110 92 4080 6790 7650
38 698 1160 1310 96 4440 7390 8330
42 852 1420 103 5110 8510 9590
45 978 1630
n Special requirements on breaking forces can also be met.
48 1110 1850
n Spiral Strands may be provided conforming to various relevant national
50 1210 2010
and international standards to suit customer needs.
51 1260 2090 n Spiral Strands can also be provided in sizes and constructions not included
52 1310 2170 in the table above.
54 1410 2340
n Special requirements on breaking forces can also be met.
n Spiral Strands may be provided conforming to various relevant national
and international standards to suit customer needs.
n Spiral Strands can also be provided in sizes and constructions not included
in the table above.
62 63
34. 3 STRAND SAFETY BARRIERS 3 STRAND TRAWLER ROPE
3 x 7 (6-1)
NOM. NOM. MINIMUM BREAKING FORCE
ROPE APPROX. ROPE APPROX.
MINIMUM BREAKING FORCE
DIA MASS DIA MASS 1570 N/mm2
Kg./100m
mm Kg./100m kN mm kN
19 116 173.6 12 52.6 84
14 72.2 115
16 91.8 146
Supplied as Pre-stretched
Lay - Right Hand 18 115 185
Coating - Galvanised Class – A (normal coating mass of 230 gm/m2) 20 147 230
may also be supplied with coating mass of 400 gm/m2. 22 175 276
24 211 329
26 241 386
Typical
28 281 447
Applications:
30 322 513
32 366 573
Note:
3
The following are the constructions available for each diameter.
1
Diameter tolerance -1, +4%. All ropes are galvanised.
Diameter Constructions
12 mm 3 x 19 S
14 mm 3 x 19 S
16 mm 3 x 19S, 3 x 26SW & 3 x 31SW
18 mm 3 x 19S, 3 x 26SW & 3 x 31SW
2 20 mm 3 x 19S, 3 x 26SW & 3 x 31SW
4 22 mm 3 x 19S, 3 x 26SW & 3 x 31SW
1. Water Fronts
24 mm 3 x 19S, 3 x 26SW & 3 x 31SW
2. Crossings
26 mm 3 x 26SW & 3 x 31SW
3. Turnings
28 mm 3 x 26SW & 3 x 31SW
4. Hair Pin Bends
30 mm 3 x 26SW & 3 x 31SW
5. Khuds
32 mm 3 x 26SW & 3 x 31SW
6. R.O. Bs/
Approaches
5 6
64 65
35. 4 STRAND TRAWLER ROPE HYFLEX 4
4/26SW (10-5+5-5-1)
NOM. APPROX. MINIMUM BREAKING FORCE NOM. NOM. MINIMUM BREAKING FORCE
APPROX.
ROPE MASS ROPE ROPE
1570 N/mm2 MASS 1770 N/mm2 1960 N/mm2
DIA Kg./100m DIA DIA
mm FIBRE kN mm in Kg./100m kN kN
12 56.9 82.1 10 44.8 64.0 69.4
14 77.4 112 12 65.4 92.3 99.9
16 100 146 14 88.8 125.5 136.5
18 126 185
16 5/8 117 164.5 177.4
20 156 228
18 149 207.5 224.5
22 188 275
19 3/4 167 231.5 250.5
24 224 328
26 263 385 20 183 256.5 277.5
28 305 446 22 214 310 336
30 350 512 7/8 218 317 343
32 398 583 24 253 369 400
25 275 399 432
1 284 413 448
Note: 26 298 433 469
n All intermediate sizes are also available. 28 346 502 544
n All Ropes are galvanised. 30 398 576 624
32 1.1/4 456 656 689
34 512 740 802
36 574 830 898
38 1.1/2 640 924 1002
40 709 1002 1082
42 782 1102 1192
44 859 1212 1312
45 898 1272 1372
Note:
Rope Sizes and Breaking Force not shown in the standard table, may be available
on request and prior confirmation.
66 67