Ship’s mooring and towing fittings –Steel rollers

ISO 13755：2012

Materials

Roller：steel casting having a yield point of not less than 205N/mm2 or steel plates having a yield point of not less than 235 N/mm2.
Axle：weldable steel casting having a yield point of not less than 350N/mm2 or equivalent.
Bush：brass、bronze or equivalent.
Type： Type A：made of steel casting without upper dust cover Type B：made of steel casting with upper dust cover Type C：made of steel plate with dust cover Manufacturing and inspection All surfaces of the steel rollers，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 the ropes by abrasion. The steel rollers shall be coated externally with an anti-corrosion protective finish. The rotating parts are to be provided with greasing.

Type A / TypeB

Nominal size Dn D1 D2 +2/0 D3 +2/0 D4 D5 H7 R1 R2 R3 R4 H H1 H2 H3 H4 e
150 150 230 216 110 90 30 52 15 11 137 25 84 44.7 43.38 37.7
200 200 300 280 145 115 40 66 20 13 157 30 99 59.2 35.46 46.3
250 250 370 340 165 135 50 80 25 15 177 32 105 73.5 28.33 55.0
300 300 430 400 190 150 55 87 30 16 197 33 125 82.6 32.62 60.8
350 350 490 460 210 167 55 89 30 17 217 33 140 83.7 49.06 63.7
400 400 560 520 225 177 63 99 30 18 237 43 150 91.8 52.0 72.2
450 450 620 590 245 190 63 101 30 19 257 43 162 92.5 67.07 74.8
500 500 680 660 260 205 63 103 30 20 277 43 180 93.0 82.94 77.6
Nominal size Dn h h1 h2 Set screw T T1 N Welding Leg length SWL­b Calculated Weightc （kg/set）
θ=90°a θ=0°
s z1 （KN） （t） （KN） （t） Type A TypeB
150 5 35 25 M6 22 - 6 8 265 27 186 19 23 24
200 5 38 35 M6 26 - 6 10 441 45 314 32 42 43
250 6 40 35 M8 30 - 6 11 579 59 412 42 77 80
300 7 45 40 M8 32 29 8 12 726 74 510 52 109 112
350 7 50 45 M8 34 29 8 15 1040 106 736 75 154 160
400 7 53 49 M8 36 30 12 17 1246 127 883 90 207 215
450 7 57 53 M8 38 32 12 20 1599 163 1128 115 275 286
500 7 65 60 M8 40 34 12 23 1942 198 1373 140 360 374
a θ is the relative angle of ropes on the steel roller（refer to Annex A）. b The SWL is the maximum applicable rope tension based on 90°（θ=90°）and 180°（θ=0°）deflection of rope direction by steel roller. The SWL s shown in this table are for reference only. These are based on the loading as mentioned in Annex A. The “SWL” may be adjusted depending on the actual loading conditions，and the actual marking shall be as agreed between the user and manufacturer. c The calculated weight is for reference only.

Type C

Nominal Size Dn D1 D2 +2/0 D3 +2/0 D4 D5 H7 D6 D7 D8 H7 D9 R1 R2 R3 R4 H H1
150 150 230 220 121 95 110 121 69 140 40 17 20 214 150 16
200 200 300 280 162 118 140 144 86 190 50 21 25 279 185 21
250 250 370 340 186 136 160 162 97 250 60 25 30 327 220 25
300 300 430 400 209 149 180 175 114 300 65 28 32 446 240 30
350 350 490 455 236 172 195 198 130 350 70 30 35 537 260 35
400 400 560 520 254 184 207 215 145 400 80 40 40 680 280 40
450 450 620 580 269 199 225 230 160 450 85 45 42 797 292 45
500 500 680 640 293 217 240 254 178 500 90 50 45 885 305 50
Nominal Size Dn H2 H3 h4 H5 (H6) e h h1 h2 h3 P Set Screw T T1 N
S
150 115 56.6 44.92 18.0 22.4 47.9 5 35 45 35 7 M6 10 10 6
200 140 70.7 56.27 22.8 27.3 59.9 5 45 55 40 8 M6 10 10 6
250 170 84.9 67.89 26.4 35.7 72.0 6 55 65 50 8 M8 10 10 6
300 187 91.6 74.25 26.3 38.8 78.1 7 62 70 55 10 M8 12 12 8
350 203 99.0 82.60 23.8 46.3 84.6 7 68 75 60 11 M8 16 16 8
400 220 113.1 71.30 29.0 50.0 93.6 7 75 80 65 11 M8 19 19 12
450 238 119.9 67.31 33.8 52.3 96.9 7 87 81 70 11 M8 19 19 12
500 251 127.3 63.70 36.9 58.0 101.2 7 87 89 75 12 M8 21 21 12
Nominal Size Dn Welding leg length SWLb Calculated Weightc （kg/set）
θ=90°a θ=0°
Z1 Z2 （KN） （t） （KN） （t） Type37 C
150 8 7 265 27 186 19 21
200 10 8 441 45 314 32 37
250 11 8 579 59 412 42 56
300 12 10 726 74 510 52 86
350 15 10 1040 106 736 75 127
400 17 12 1246 127 883 90 174
450 20 12 1599 163 1128 115 215
500 23 14 1942 198 1373 140 253
a θ is the relative angle of ropes on the steel roller（refer to Annex A）. b The SWL is the maximum applicable rope tension based on 90°（θ=90°）and 180°（θ=0°）deflection of rope direction by steel roller. The SWL s shown in this table are for reference only. These are based on the loading as mentioned in Annex A. The “SWL” may be adjusted depending on the actual loading conditions，and the actual marking shall be as agreed between the user and manufacturer. c The calculated weight is for reference only.