Ship’s mooring and towing fittings –Mooring chocks

ISO 13713:2012

Materials

Chock:steel casting material having a yield point of not less than 235 N/mm2 or equivalent.
The chock contents of the steel casting are not to be more than 0.23% considering weldability.

Manufacturing and inspection

All surface of the mooring chocks,including welding,shall be free from any visible flaws or imperfections.
All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to ropes by abrasion
The mooring chocks shall be coated externally with an anti-corrosion protective finish.

Type

Type A :Deck-mounted mooring chock
Type B:Bulwark-mounted mooring chock

Type A

Nominal size L*H l1 l2 l3 B H1 H2 R R1 R2
250*200 100 250 444 160 377 80 100 197 80
300*250 110 300 536 200 468 100 125 243 100
350*250 125 350 608 220 489 110 125 254 110
400*250 135 400 682 240 511 120 125 266 120
450*250 150 450 760 260 535 130 125 280 130
500*250A 175 500 832 280 556 140 125 291 140
500*250B 175 500 840 280 560 140 125 295 140
Nominal size L*H R3 R4 R5 T T1 Welding leg lengtha SWLb Calculated Weightc (kg)
Z1 (KN) (t)
250*200 46 20 15 34 18 8.5 353 36 73
300*250 64 25 20 36 20 9 491 50 121
350*250 72 30 20 38 20 9.5 589 60 151
400*250 78 30 20 42 23 10.5 736 75 200
450*250 80 30 20 50 28 12.5 981 100 280
500*250A 88 30 20 52 30 13 1128 115 338
500*250B 80 30 20 60 36 15 1373 140 396
a The welding method may be changed based on the same welding volume/strength. b The SWLs shown are for reference only. These are based on the loadings as mentioned in Annex A. The “SWL” may be adjusted depending on the actual loading conditions,and the actual marking shall be agreed between the user and the manufacturer. c The calculated weight is for reference only.

Type B

Nominal size L*H l1 l2 B H1 H2 C R R1 R2
250*200 450 398 154 408 327 57 100 200 174
300*250 516 460 168 466 387 60 125 233 205
350*250 582 520 177 482 395 65 125 241 210
400*250 652 588 193 502 412 70 125 251 219
450*250 734 662 213 534 433 77 125 267 231
500*250A 812 730 237 562 447 82 125 281 240
500*250B 828 750 253 578 466 82 125 289 250
Nominal size L*H R3 T T1 Welding leg lengtha SWLb Calculated weightc (kg)
Z1 Z2 (KN) (t)
250*200 78 26 20 8 8 353 36 48
300*250 85 27 24 8 9.5 491 50 83
350*250 90 29 25 9 10 589 60 100
400*250 98 34 32 9.5 13 736 75 145
450*250 108 41 36 12.5 14.5 981 100 215
500*250A 120 41 36 12.5 14.5 1128 115 235
500*250B 128 48 41 14.5 16.5 1373 140 266
a The welding method may be changed based on the same welding volume/strength b The SWLs shown are for reference only. These are based on the loading as mentioned in Annex A c The calculated weight is for reference only.