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Sec.7: Tests of Steel Wire Rope Intended for Mobile Mooring and Towing [Table of Contents] Sec.8: Identification and Records

DNV-OS-E304 Offshore Mooring Steel Wire Ropes

[-] Ch.2: Technical Provisions
[-] Sec.7: Tests of Steel Wire Rope Intended for Mobile Mooring and Towing
[-] A: General

Ch.2 Sec.7
A. General

Ch.2 Sec.7
A 100   Scope

Ch.2 Sec.7 A
101   This section covers requirements to testing of wire ropes intended for mobile mooring and towing in order to determine that the minimum certified breaking load of the wire rope has been achieved

Ch.2 Sec.7
A 200   Description of tests

Ch.2 Sec.7 A
201   Every manufactured length of wire rope shall be subjected to a breaking load test. However, in the case that the manufactured lengths are produced on the same machine with the same machine settings, according to the same wire rope design and by using wires to the same wire specification, the number of break load tests may be reduced after special consideration and in agreement with the Purchaser

Ch.2 Sec.7 A
202   The breaking load shall be determined by testing to destruction a sample cut from the finished wire rope. The test length shall be taken as at least 30 times the rope diameter between the grips. The actual breaking load shall not be less than given in Table 4 for the dimension concerned. For other wire rope constructions and/or diameters the breaking load shall be in accordance with the requirements of a recognised national or international standard subject to agreement.

Ch.2 Sec.7 A
203   If facilities are not available for pulling the complete section of six strands ropes to destruction, the breaking load may be determined by testing separately 10% of all wires from each strand. The breaking load of the rope is then considered to be:

Smbs = f t k1 (kN)

f = average breaking load of one wire (kN) 
t = total number of wires 
k1 = lay factor as given in Table 3. 

Ch.2 Sec.7 A
Table 3 Lay factor kl 
Rope construction group Rope with FC Rope with IWRC 
6 ´ 19 0.86 0.80 
6 ´ 36 0.84 0.78 

Ch.2 Sec.7 A
Table 4 Test loads and masses for six strand steel wire ropes  
Rope with fibre core (FC) 
Construction groups Nominal diameter (mm) Minimum required breaking strength in kN Approximate mass (kg/100 m) 
  1570 N/mm2 1770 N/mm2  
6 ´ 19 group 24
26
28
30 		299
351
407
468 		337
396
459
527 		214
251
291
334 
6 ´ 19 group
and
6 ´ 36 group 		32
36
40
44
48
52
56
60 		530
671
829
1 000
1 190
1 400
1 620
1 860 		598
757
934
1 130
1 350
1 580
1 830
2 100 		380
480
593
718
854
1 000
1 160
1 330 
Rope with independent wire-rope core (IWRC) 
Construction groups Nominal diameter (mm) Minimum required breaking strength (kN) Approximate mass
(kg/100 m) 
1570 N/mm2 1770 N/mm2 
6 ´ 19 group 24
26
28
30 		323
379
440
505 		364
428
496
569 		241
283
328
376 
6 ´ 19 group and
6 ´ 36 group 		32
36
40
44
48
52
56
60
64
68 		573
725
895
1 080
1 290
1 510
1 750
2 010
2 290
2 590 		646
817
1 010
1 220
1 450
1 710
1 980
2 270
2 580
2 920 		428
542
669
810
964
1 130
1 310
1 510
1 710
1 930 
6 ´ 36 group 72
76
80
84
88
92
96
100
104
108
112
116
120
124
128 		2 900
3 230
3 580
3 950
4 330
4 730
5 160
5 590
6 050
6 520
7 020
7 530
8 060
8 600
9 170 		3 270
3 640
4 040
4 450
4 880
5 340
5 810
6 310
6 820
7 360
7 910
8 490
9 080
9 700
10 330 		2 170
2 420
2 680
2 950
3 240
3 540
3 850
4 180
4 520
4 880
5 250
5 630
6 020
6 430
6 850 

Sec.7: Tests of Steel Wire Rope Intended for Mobile Mooring and Towing [Table of Contents] Sec.8: Identification and Records