Donut Fender

What is Donut Fender?

Monopile Donut fenders are designed to protect ships by freely floating up and down with the tide on a stationary steel monopile either inserted into the bed or fixed on the face of a quay wall while providing an energy absorbing fender system.

Construction of a Donut fender is much the same as a Foam Filled Floating Fender made from closed cell energy absorbing foam protected by a polyurethane elastomer skin and reinforced with nylon tire cord for consistent performance over years of service. A heavy duty galvanized steel sleeve is built into the donut fender, mounted with internal UHMW pads that allow the donut fender free movement along the steel monopile assisting in lining up vessels for mooring or guiding though a channel.

Donut fenders are ideal for areas of high tidal swings, lock entrances, turning structures, approach channels and breasting dolphins. They also possible to install any combination of mooring points or secondary fenders to the external donut fender.

Jerryborg Marine donut fenders are manufactured in-house. Available in both standard and custom sizes, Our bespoke options enable you to deliver on precise requirements and achieve your objectives.

Advantages of Jerryborg Marine Pneumatic Fenders

  • 1.Donut Foam Fender Advantages

    100% Closed Cell Foam constructed to absorb high impact forces.

  • 2.Low Reaction Force

    slow gradual reaction force compared to hard rubber type fenders.

  • 3.Easy and Rapid Installation

    sInstall by lowering fender onto a pre-driven steel monopile using lifting eyes on the fender.

  • 4.Hull Conforming

    Protrusions from ship hull will not damage or harm fender.

  • 5.Self-buoyancy

    automatically follows water level changes due to the low friction guides located inside the fender

  • 6.Unsinkable

    Even when punctured.

  • 7.Easy to Maintain

    reduce ongoing operating costs and maximise lifespan.

Donut Fender Application

  • 1.Breasting dolphins
  • 2.Corner protection
  • 3.Guiding structures
  • 4.Naval vessels & submarinesprotection
  • 5.Lead-in jetties
  • 6.High tidal fluctuations
  • 7.Ferry terminals
  • 8.Bridge and pier protection

Donut Fender Technical Performance

donut fender technical performance
DONUT DIAMETER 4.5 / 1.37 5.0 / 1.52 6.0 / 1.82 7.0 / 2.13 7.5 / 2.29 9.0 / 2.74
feet / meters
PILE DIAMETER 2.0 / 0.61 2.5 / 0.76 3.0 / 0.91 3.5 / 1.06 4.0 / 1.22 5.0 / 1.52
feet / meters
PERFORMANCE ENERGY REACTION ENERGY REACTION ENERGY REACTION ENERGY REACTION ENERGY REACTION ENERGY REACTION
ABSORPTION FORCE ABSORPTION FORCE ABSORPTION FORCE ABSORPTION FORCE ABSORPTION FORCE ABSORPTION FORCE
FLAT HEIGHT ft*kip kip ft*kip kip ft*kip kip ft*kip kip ft*kip kip ft*kip kip
feet / meters (kN*m) (kN) (kN*m) (kN) (kN*m) (kN) (kN*m) (kN) (kN*m) (kN) (kN*m) (kN)
2.0 / 0.61 4 18 5 20 7 24 STANDARD CAPACITY
-5 -80 -7 –89 -9 -107
3.0 / 0.91 6 27 7 29 11 35 15 41 17 44 24 53
-8 -120 -9 -129 -15 -156 -20 -182 -23 -196 -33 -236
4.0 / 1.22 8 35 10 39 14 47 19 55 22 59 32 71
-11 -156 -14 -173 -19 -209 26 245 30 262 43 316
5.0 / 1.52 10 44 12 49 18 59 24 69 28 74 40 88
-14 -196 -16 -218 -24 -262 -33 -307 -38 -329 -54 -391
6.0 / 1.82 12 53 15 59 21 71 29 83 33 88 48 106
-16 -236 -20 -262 -28 -316 39 369 45 391 65 471
7.0 / 2.13 14 63 17 69 25 83 34 96 39 103 56 124
-19 -280 -23 -307 -34 -369 -46 -427 -53 -458 -76 -552
8.0 / 2.44 16 72 20 79 29 94 39 110 45 118 64 141
-22 -320 -27 -351 -39 -418 53 489 61 525 87 627
2.0 / 0.61 7 29 8 34 12 39 HIGH CAPACITY
-9 -129 -11 -151 -16 -179
3.0 / 0.91 10 43 11 51 17 58 24 65 27 72 39 87
-14 -191 -15 -227 -23 -258 33 289 37 320 53 387
4.0 / 1.22 13 58 15 68 23 77 33 87 36 96 52 116
-18 -258 -20 -302 -31 -342 -45 -387 -49 -427 -71 -516
5.0 / 1.52 16 72 19 84 29 96 41 109 45 121 65 145
-22 -320 -26 -374 -39 -427 56 485 61 538 88 645
6.0 / 1.82 20 87 23 101 35 116 49 130 54 145 78 174
-27 -387 -31 -449 -47 -516 -66 -578 -73 -645 -106 -774
7.0 / 2.13 23 101 27 118 41 135 57 152 63 169 91 203
-31 -449 -37 -525 -56 -600 77 676 85 752 123 903
8.0 / 2.44 26 116 30 135 46 154 65 174 72 193 104 232
-35 -516 -41 -600 -62 -685 -88 -774 -98 -858 -141 -1032
2.0 / 0.61 10 44 12 51 18 59 EXTRA HIGH CAPACITY
-14 -196 -16 -227 -24 -262
3.0 / 0.91 15 66 17 77 26 88 37 99 41 110 59 132
-20 -294 -23 -342 -35 -391 -50 -440 -56 -489 -80 -587
4.0 / 1.22 20 88 23 103 35 117 49 132 55 147 79 176
-27 -391 -31 -458 -47 -520 66 587 75 654 107 783
5.0 / 1.52 25 110 29 128 44 147 62 165 69 183 99 220
-34 -489 -39 -569 -60 -654 -84 -734 -94 -814 -134 -979
6.0 / 1.82 30 132 35 154 53 176 74 198 82 220 119 264
-41 -587 -47 -685 -72 -783 100 881 111 979 161 1174
7.0 / 2.13 35 154 40 180 62 205 87 231 96 256 138 308
-47 -685 -54 -801 -84 -912 -118 -1027 -130 -1139 -187 -1370
8.0 / 2.44 40 176 46 205 70 234 99 264 110 293 158 352
-54 -783 -62 -912 -95 -1041 134 1174 149 1303 214 1566
2.0 / 0.61 15 66 17 77 26 88 SUPER HIGH CAPACITY
-20 -294 -23 -342 -35 -391
3.0 / 0.91 22 99 26 115 40 132 56 148 62 165 89 198
-30 -440 -35 -512 -54 -587 76 658 84 734 121 881
4.0 / 1.22 30 132 35 154 53 176 74 198 82 219 119 263
-41 -587 -47 -685 -72 -783 -100 -881 -111 -974 -161 -1170
5.0 / 1.52 37 165 43 192 66 219 93 247 103 274 148 329
-50 -734 -58 -854 -89 -974 126 1099 140 1219 201 1463
6.0 / 1.82 44 198 52 230 79 263 111 296 123 329 178 395
-60 -881 -71 -1023 -107 -1170 -151 -1317 -167 -1463 -241 -1757
7.0 / 2.13 52 230 60 269 92 307 130 346 144 384 207 461
-71 -1023 -81 -1197 -125 -1366 176 1539 195 1708 281 2051
8.0 / 2.44 59 263 69 307 105 351 148 395 165 439 237 527
-80 -1170 -94 -1366 -142 -1561 -201 -1757 -224 -1953 -321 -2344

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