1, the ship overload
This damage often occurs in the rubber fender, especially some old rubber fenders, often in the weak structure of the crack. The cracks are generally in the length of the rubber fender. D-type and V-type fenders are more common. The main reason for the cracking of the rubber fender is that the impact of the fender's fender is too great, exceeding the load on the rubber fender. And cause the ship to hit the kinetic energy is too large because of the ship speed and by the ship angle is too large. Especially when the ship is larger, the bow is in front of the hull and the rubber fender, causing strong impact kinetic energy to concentrate on one or more fenders, causing the rubber fender to be damaged. Resulting in the impact of the ship is too large, in addition to the above reasons, there are berths greater than the design of the ship and tonnage of the ship and the impact of wind and waves on the ship.
2, anchoring and poor connection
This has happened in all kinds of rubber fenders. Rubber fenders are loose, off, off into the sea and other non-normal phenomenon. The main reason for this phenomenon is the anchoring fender bolts or chains and other technical conditions are not good, or maintenance did not keep up due. Fixed fender anchors bolts, chains and other metal materials in the marine environment, corrosion is extremely fast, and difficult to replace, resulting in rubber fender fixed bad, and thus seriously affect the normal use of the fender. Some of the anchor bolts in the design, although taking into account the replacement conditions, but in actual use is often not ideal. Such as V-type rubber fender anchor bolts, the Department of embedded bolt box in the form. The original design intention is to facilitate the repair and replacement of anchor bolts, but in actual use but because of iron corrosion, bolt deformation and other reasons can not be replaced, thus affecting the rubber fender fixed quality, causing the fender off and damage.
3, friction damage
This is usually done in fixed V-and D-type fenders. Fenders are mainly cornering, cracking, surface scratches and other damage. The main reason for this damage is the friction between the rubber fender and the ship is too large. When the ship is docked at a greater tangential velocity, the rubber fender is in contact with the hull and is forced to move forward with the ship due to excessive friction, causing the fender to be damaged. In addition, during mooring operations, the ship sometimes needs to move back and forth, as well as the ship by the waves, the flow caused by the left or right or up and down. In this case, when the friction coefficient between the ship and the rubber fender is 0.4 (if the cable is too tight), it may cause damage to the fender.
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