Home > Knowledge > Content
Cause of damage to rubber fender
Aug 17, 2018
  1.  Overload of ship

      Such damage often occurs in the rubber fender, especially in some old rubber fender, often cracking in the weak part of the structure.The crack is usually in the length direction of the rubber fender.D type and V type fender are more common.The main reason for the cracking of rubber fender is that the kinetic energy of the ship hitting the fender is too high, which exceeds the load that the rubber fender can bear.The cause of the high kinetic energy of the collision is the high speed and Angle of the collision.Especially when the ship is at a larger Angle, the ship heads ahead of the middle of the ship to contact the pier and the rubber fender, resulting in the strong impact energy concentrated on one or several fenders, resulting in the rubber fender damage.In addition to the above reasons, there are also the ship whose berthing at the wharf is greater than the designed ship type and tonnage, as well as the impact of wind and waves on the ship.

  2. Poor anchoring and connection

      This has happened in all types of rubber fenders.Rubber fender loose, dislocated, off into the sea and other abnormal phenomenon.This phenomenon is mainly caused by poor technical conditions such as bolts or iron chains of anchor fender, or failure to keep up with maintenance.Metal materials such as anchor bolts and iron chains that fix the fender quickly rust in the Marine environment and are not easy to be replaced, resulting in poor rubber fender fixation, which seriously affects the normal use of fender.Although some anchor bolts are designed with the condition of replacement in mind, they are not ideal in practice.If V - type rubber fender anchor bolts, fastening the form of embedded bolt box.The original design intention was to facilitate the maintenance and replacement of anchor bolts, but in actual use due to iron corrosion, deformation of bolts and other reasons and cannot be replaced, thereby affecting the quality of rubber fender fixation, resulting in fender shedding and damage.

  3. Friction damage

      This usually occurs in fixed V and D fenders.The fender is mainly damaged by Angle loss, cracking and surface abrasion.The main cause of this damage is too much friction between the rubber fender and the ship.When the ship comes to shore at a high tangential speed, the contact part of the rubber fender and the ship hull is forced to move forward together with the ship due to excessive friction, causing the fender to be sheared and damaged.In addition, during the mooring operation, the ship sometimes needs to move forward and backward, as well as the ship's left and right or up and down shaking caused by waves and currents.In this case, the coefficient of friction between the ship and the rubber fender is greater than 0.Damage to the fender may occur if the cable is pulled too tight. 

Jiangsu Ronggang Equipment Co.,Ltd is located in the historical and cultural city of  Yangzhou. It covers an area of more than 4000 square meters and it has more than 100 sets of production equipment and testing equipment, nearly twenty kinds of products, and 300 specifications. It is one of the largest manufacturers of rubber fenders in China.

Related Industry Knowledge