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Causes Of Damage To The Rubber Fender
- Jul 23, 2018 -

1. Ship overload

This type of damage often occurs in rubber fenders, especially some old rubber fenders, which often crack at weak points in the structure. The crack is generally in the length direction of the rubber fender. D-type and V-type fenders are more common. The main cause of cracking of the rubber fender is that the kinetic energy of the ship striking the fender is too large to exceed the load that the rubber fender can withstand. The reason for the excessive kinetic energy of the ship is that the speed of the ship and the angle of the ship are too large. In particular, when the angle of the ship is large, the bow contacts the pier and the rubber fender before the middle of the hull, causing strong impact kinetic energy to concentrate on one or several fenders, causing damage to the rubber fender. The ship's impact function is too large. In addition to the above reasons, there are ships with docks that are larger than the designed ship type and tonnage and the impact of wind and waves on the ship.

2, anchoring and poor connection

This has happened in all types of rubber fenders. Rubber fenders are loose, off-position, and fall into the sea and other abnormal phenomena. The main cause of this phenomenon is that the technical conditions of the bolts or chains that anchor the fenders are not good, or the maintenance has not kept up. Metal materials such as anchor bolts and chains of fixed fenders are extremely rusted in the marine environment and are not easily replaced, resulting in poor fixing of the rubber fenders, which seriously affects the normal use of the fenders. Some anchor bolts are designed with replacement conditions in mind, but they are often less than ideal in actual use. For example, V-type rubber fender anchor bolts are in the form of pre-embedded bolt boxes. The original design was intended to facilitate the repair and replacement of the anchor bolts, but in actual use, it could not be replaced due to corrosion of the iron parts, deformation of the bolts, etc., thereby affecting the quality of the rubber fenders and causing the fenders to fall off and be damaged.

3, friction damage

This usually occurs in fixed V- and D-type fenders. The fender mainly has damage such as falling corners, cracking, and surface abrasion. The main cause of this damage is the excessive friction between the rubber fender and the ship. When the ship is docked at a large tangential speed, the contact portion of the rubber fender with the hull is forced to move forward with the ship due to excessive friction, causing the fender to be sheared and damaged. In addition, during mooring operations, the ship sometimes needs to move back and forth, as well as the left and right or up and down shaking of the ship caused by waves and currents. In this case, when the coefficient of friction between the ship and the rubber fender is 0.4 (if the cable is pulled too tight), the fender may be damaged.


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