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coir ropes
The general requirements of three types of coir ropes for which standards have been specified are as follows:
a) Two grades of Hawser-laid (3 strand) coir ropes of diameter 8 to 176 mm and with a liner density from 47 to 15720 ktex (g/m) for dry coir rope and from 60 to 21112 ktex (g/m) for oiled coir rope.
b) Two grades of Shroud-laid (4 strand) coir ropes of diameter 24 to 176 mm and with liner density from 321 to 27170 ktex(g/m) for dry coir rope and from 437 to 23257 ktex (g/m) for oiled coir rope.
c) To grades Cable –laid (9 strand) coir ropes of diameter 48 to 176 mm and with a liner density from 1010 to 13335 ktex (g/m) for dry coir rope and from 1371 to 17184 ktex (g/m) for oiled coir rope.
 
The standard does not cover ropes intended for use for lifting purpose
For the purpose of this standard, the definitions given in IS: 3871-1966 shall apply.
Coir rope shall be graded as Grade I or Grade II on the basis of the breaking load values.
The tolerance permitted for liner density in respect of the three types of coir ropes shall be plus or minus 5% of the specified nominal value.
Manufacture
The fibre iused in the manufacture of ropes shall be coir, true to its type and shall be unadulterated and free from siliceous matter and shorts. The fibre shall be of good quality, fineness and colour necessary to produce ropes having the characteristics required and specified in tables 1 to 3.

The yarn shall be well and evenly spun. All coir yarns are two-fold being formed by twisting together two single loosely twisted thread. They are all hand-made.

Strand of rope shall be well formed, free from grooves, kinks and sunken yarns and each strand shall contain an equal number of yarns. The strand shall have S-lay.

The rope shall be well laid and free from defects and each coir shall be continuous throughout its length and shall not contain loose ends,. Splices or joints in the strands or in the rope. The number of strands in the rope and the lay of rope, unless otherwise specified, ahall be as under.
 
Construction Number of Strand Lay of Rope
Hawser-laid 3 Z-lay
Shroud-laid 4 Z-lay
Cable - laid 9(with 3 primary ropes twisted together) Z-lay for primary rope and S-lay for final rope
 
For the purpose of dressing the fibre or for preservation of the rope, a lubricant may be added. The quantity of dressing material applied to the fibre when determined by extracion with peetrolium ether or other suitable solvent, shall be not less than 10 or more than 15 percent calculated on the mass of the finished rope.

Unless specifically required by the buyer, no colouring agent shall be used. Weighing or loading material shall not be used. All ends shall be securely shipped or marked.

Rope shall be maked for the purpose of identification as agreed to between the buyer and the seller. Unless otherwise specified, ropes shall be packed conforming to the requirements laid down in IS:3256-1965.

Each coil shall have at both ends lables securely attached on which the following shall be marked.

a)Manufacturer’s name and trade mark.

b)Length of rope in the coil

c)Diameter of the rope

d)Any other marking required by the buyer.

Requirements: 1.Mass:- The net mass of the coil of ropes in a lot shall not differ by more than + 5% from the mass of the coils as calculated from the liner density.

2 Pitch :-The pitch of rope when determined by the method given in IS:7071 (Part III)-1974 shall conform to the following requirements.

Construction Pitch X Diameter of rope
Hawser-laid Between 2.5 and 3.3
Shroud-laid Between 2.7 and 3.5
Cable-laid Between 2.2. and 3.2

3.Length of coils :-The length of each coil shall be 220 m. or as agreed to between the buyer and the seller.

4.Other requirements :-The Hawser laid coir ropes shall conform to the requirements of tables 1,Shroud-laid coir ropes to the requirements of table 2 and Cable-laid ropes to the requirements of table –3
 
TABLE –I REQUIREMENTS FOR HAWSER-LAID COIR ROPE
Diameter No.of yarns / Strands,Min. Linear Density Breaking Load Min.
        mm.   Dry     Ktex (g/m) Oiled     Ktex (g/m) Grade I (Dry or Oiled)   kN Grade 2 (Dry or Oiled)   kN
8 2 47 60 0.784 0.637
10 3 55 75 1.225 1.157
12 2 67 95 1.911 1.764
16 2 130 178 3.431 3.088
20 4 200 273 5.343 4.657
24 5 295 405 7.451 6.618
28 7 390 528 9.951 8.873
32 9 520 705 12.941 12.255
36 10 645 875 16.912 13.333
40 11 815 1098 20.931 19.310
48 12 1180 1600 29.657 26.569
56 16 1550 2110 45.735 35.441
64 21 2 070 2 811 51,716 49,706
72 27 2 570 3 488 66,225 65,196
80 33 3 790 4 169 80,735 76,982
88 40 3 930 5 276 97,324 86,569
96 48 4 715 6 396 111,078 106,330
104 56 5 465 7 417 130,490 110,784
112 65 6 215 8 934 150,882 141,814
120 75 7 255 9 845 173,333 160,294
128 85 8 290 11 244 205,196 198,334
136 96 9 290 12 601 231,078 205,392
144 108 9 830 13 353 259,314 241,176
152 120 11 280 15 317 288,824 256,912
160 133 12 230 16 675 320,198 313,824
168 147 14,010 18 955 353,039 313,824
176 161 15 720 21 112 388,745 346,176
Note:- 1 kN= 102 kgf approximately.
 
TABLE –2 REQUIREMENTS FOR SHROUD-LAID COIR ROPE
Diameter No.of yarns / Strands,Min. Linear Density Breaking Load Min.
        mm.   Dry     Ktex (g/m) Oiled     Ktex (g/m) Grade I (Dry or Oiled)   kN Grade 2 (Dry or Oiled)   kN
24 --- 321 437 6.517 5.782
28 --- 428 583 8.679 7.747
32 --- 564 765 11.719 10.444
36 --- 697 948 14.710 13.092
40 --- 877 1189 19.123 17.014
48 9 1285 1745 25.988 23.144
56 12 1695 2296 33.784 30.106
64 16 2265 3066 46.483 41.384
72 20 2810 3004 59.183 52.662
80 25 3350 4542 70.215 62.468
88 30 4290 5809 84.680 75.364
96 35 5120 6998 101.449 90.270
104 42 5965 8082 117.875 104.931
112 48 6790 9198 135.674 120.719
120 55 7915 10724 156.906 141.460
128 63 9050 12260 178.578 158.965
136 71 10145 13740 201.085 178.971
144 80 10735 14560 225.846 200.987
152 89 12320 16697 251.393 224.719
160 99 13405 18178 278.704 248.058
168 108 15290 20660 307.339 273.506
176 119 17170 23257 3338.769 301.504
Note:-1kN =102 kgf. Approximately.
 
TABLE –3 REQUIREMENTS FOR CABLE-LAID COIR ROPE
Diameter No.of yarns / Strands,Min. Linear Density Breaking Load Min.
        mm.   Dry     Ktex (g/m) Oiled     Ktex (g/m) Grade I (Dry or Oiled)   kN Grade 2 (Dry or Oiled)   kN
48 --- 1010 1371 17.456 15.053
56 --- 1360 1840 22.947 20.447
64 --- 1770 2401 29.910 26.380
72 7 2240 3034 37.363 33.882
80 8 2760 3745 45.846 41.384
88 10 3340 4533 55.800 50.308
96 12 3945 5348 66.783 60.311
104 14 4630 6282 77.711 69.725
112 16 5410 7344 90.662 81.689
120 19 6190 8396 103.607 93.163
128 21 7070 9134 117.581 105.617
136 24 7990 10866 133.517 120.082
144 27 8945 12137 149.943 134.986
152 30 10445 13248 167.399 140.438
160 33 11060 15002 184.855 166.418
168 37 12200 16551 202.261 181.864
176 40 13355 17184 221.188 199.270
Note:- 1kN =102 kgf. Appr oximately.
 
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