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

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      DONUT DIAMETER4.5 / 1.375.0 / 1.526.0 / 1.827.0 / 2.137.5 / 2.299.0 / 2.74
      feet / meters
      PILE DIAMETER2.0 / 0.612.5 / 0.763.0 / 0.913.5 / 1.064.0 / 1.225.0 / 1.52
      feet / meters
      PERFORMANCEENERGYREACTIONENERGYREACTIONENERGYREACTIONENERGYREACTIONENERGYREACTIONENERGYREACTION
      ABSORPTIONFORCEABSORPTIONFORCEABSORPTIONFORCEABSORPTIONFORCEABSORPTIONFORCEABSORPTIONFORCE
      FLAT HEIGHTft*kipkipft*kipkipft*kipkipft*kipkipft*kipkipft*kipkip
      feet / meters(kN*m)(kN)(kN*m)(kN)(kN*m)(kN)(kN*m)(kN)(kN*m)(kN)(kN*m)(kN)
      2.0 / 0.61418520724STANDARD CAPACITY
      -5-80-7–89-9-107
      3.0 / 0.916277291135154117442453
      -8-120-9-129-15-156-20-182-23-196-33-236
      4.0 / 1.2283510391447195522593271
      -11-156-14-173-19-209262453026243316
      5.0 / 1.52104412491859246928744088
      -14-196-16-218-24-262-33-307-38-329-54-391
      6.0 / 1.821253155921712983338848106
      -16-236-20-262-28-316393694539165471
      7.0 / 2.1314631769258334963910356124
      -19-280-23-307-34-369-46-427-53-458-76-552
      8.0 / 2.44167220792994391104511864141
      -22-320-27-351-39-418534896152587627
      2.0 / 0.617298341239HIGH CAPACITY
      -9-129-11-151-16-179
      3.0 / 0.91104311511758246527723987
      -14-191-15-227-23-258332893732053387
      4.0 / 1.221358156823773387369652116
      -18-258-20-302-31-342-45-387-49-427-71-516
      5.0 / 1.52167219842996411094512165145
      -22-320-26-374-39-427564856153888645
      6.0 / 1.8220872310135116491305414578174
      -27-387-31-449-47-516-66-578-73-645-106-774
      7.0 / 2.13231012711841135571526316991203
      -31-449-37-525-56-6007767685752123903
      8.0 / 2.442611630135461546517472193104232
      -35-516-41-600-62-685-88-774-98-858-141-1032
      2.0 / 0.61104412511859EXTRA HIGH CAPACITY
      -14-196-16-227-24-262
      3.0 / 0.9115661777268837994111059132
      -20-294-23-342-35-391-50-440-56-489-80-587
      4.0 / 1.2220882310335117491325514779176
      -27-391-31-458-47-5206658775654107783
      5.0 / 1.52251102912844147621656918399220
      -34-489-39-569-60-654-84-734-94-814-134-979
      6.0 / 1.823013235154531767419882220119264
      -41-587-47-685-72-7831008811119791611174
      7.0 / 2.133515440180622058723196256138308
      -47-685-54-801-84-912-118-1027-130-1139-187-1370
      8.0 / 2.4440176462057023499264110293158352
      -54-783-62-912-95-1041134117414913032141566
      2.0 / 0.61156617772688SUPER HIGH CAPACITY
      -20-294-23-342-35-391
      3.0 / 0.9122992611540132561486216589198
      -30-440-35-512-54-5877665884734121881
      4.0 / 1.223013235154531767419882219119263
      -41-587-47-685-72-783-100-881-111-974-161-1170
      5.0 / 1.5237165431926621993247103274148329
      -50-734-58-854-89-974126109914012192011463
      6.0 / 1.82441985223079263111296123329178395
      -60-881-71-1023-107-1170-151-1317-167-1463-241-1757
      7.0 / 2.13522306026992307130346144384207461
      -71-1023-81-1197-125-1366176153919517082812051
      8.0 / 2.445926369307105351148395165439237527
      -80-1170-94-1366-142-1561-201-1757-224-1953-321-2344