Send Message
Home News

company news about How Marine Fenders Are Used For Ship Berthing?

China Qingdao Jerryborg Marine Machinery Co., Ltd certification
China Qingdao Jerryborg Marine Machinery Co., Ltd certification
Customer Reviews
I’m late in sending this, but wanted to thank Jerryborg Marine for the great job they did on the pneumatic fenders that they fabricated for me. They work perfectly and serve a long time. Very glad I found them.

—— Deepark-Dolphine Rubber

The guys over at Jerryborg Marine not only provided quick estimates, an honest timetable, and professional courtesy, but also quality work that exceeds their fair pricing. I recommend them for anyone's next project.

—— Thanh Dong-Vietnam Ecomarine

I choose Jerryborg Marine because I simply could not find any other provider that offered all the marine products I needed under one platform, such as pneumatic fenders, anchors, chains, steel wire ropes, shackles.

—— Alessandro Bitocchi-PSG AB

I have a problem with products from another vendor. The engineer of Jerryborg Marine is very enthusiastic and helps me a lot to solve the problem. I really appreciate their professional work and experts team.

—— Peter.S-USA Offshore Rental

I'm Online Chat Now
Company News
How Marine Fenders Are Used For Ship Berthing?
Latest company news about How Marine Fenders Are Used For Ship Berthing?


How Marine Fenders Are Used For Ship Berthing?


One of the primary factors -external to the ship's mechanical or electrical systems – that come into effect while berthing a vessel is the marine fender system. An efficient fender system saves the ship from external damages that would have otherwise occurred to the hull plates or to the berth or jetty, which comes in contact with the steel plates of the ship.


Theoretically speaking, a ship is to be brought at a negligible speed to the berth. A small increase in speed will give rise to an exponential jump in the momentum – which essentially is the product of mass and velocity. For example, the displacement tonnage of 10,000 when multiplied by a speed of one knot has half the momentum when multiplied by a speed of two knots. The energy of the impact is twice, thrice, four times, and so on with every knot of increase of speed.


Now, when it comes to practice the speed always cannot be restricted to bare minimum, owing to certain conditions such as the tides, wind effects, tugs erratic pull, engine failures, etc. A good marine fender system can save the day in such exigencies.

Ideally, a marine fender system should be cost-effective, with low maintenance cost and high durability. The material should be locally available should a case of replacement arise.


While berthing, the navigator of the ship has to consider the amount of berthing energy involved. It is actually a product of various variants such as mass of the vessel or displacement, it’s approach velocity, the added mass co-efficient ( which is the mass of the water that is moving along with the vessel and is suddenly stopped at the point of contact), the eccentricity factor which is the rotational movement generated by a reaction force when the bow or stern comes in contact with the marine fenders at the berth, the berthing configuration factor which is the amount of energy absorbed by the cushion effect of the water between the quay wall of the berth and the approaching vessel, and the softness factor which is the energy absorbed by the deformation of the ship’s hull and the shore marine fender.


Abnormal energy is the energy that exceeds the normal berthing energy when berthing is done in abnormal conditions such as inclement weather, during human or technical error, or an ominous combination of all three.


To neutralize this kinetic force imparted by the ship on the pier or berth, some work must be done by the quay wall and the shore structure upon the hull of the ship.


The reactive force of the dock installations increases dramatically, immediately after the impact of the ship's hull upon it. As a result, both the hull and the dock structure deflect according to their respective stiffness.


Herein the marine fender, which is fitted in their interface, becomes active. It deflects and reduces the berthing energy drastically without causing permanent damage to the hull of the vessel or concrete of the berth. Naturally, fenders should have high force absorption capacity without exerting a reactive force upon the quay.



Types of Fenders


Now the question arises what is the type of fender to be used in specific berthing of ship?


Marine fender selection is important as it determines the safety of the personnel, cargo, and body of the ship and its equipment. The turn around time of the ship can depend on the quality of the fender. One has to keep in mind the statistics of the heaviest and the largest vessel that reports to the dock before selecting and arranging the marine fender system.



Hollow wooden fenders of yesteryears are now giving way to various types of rubber marine fender, foam marine fender, and pneumatic marine fenders Now fixed rubber fender systems comes in different varieties such as

1. Cone fenders
2. Cell fenders
3. Arch fenders
4. Cylindrical fenders
5. D type fenders
6. Leg fenders
7. Dock corner rubber fenders
8. Pie-type rubber fenders


Foam fenders contain chemicals such as Ethylene Vinyl Acetate (EVA), which are floatable and low in maintenance cost. A polyurethane spray or elastic-polymer sprays are used over these fenders to create a near-total wear-resistant exterior.

Pneumatic fenders are air-filled floating marine fenders which can be fitted on quay wall or ships hull according to the requirement. There are four types of pneumatic marine fenders


1. Sling type fender
2. Rib type fender
3. Rope net fender
4. China and tyre net.


Fenders are an integral part of the safety system of the ship which reduces the shocks upon the quay or the hull. A wide range of variety of marine fenders is available in the market for different applications. They are not only used for merchant's vessels, but also for boats, yachts, and other floating vessels.

The right choice of the marine fender to optimize the cost and the effectiveness is a matter which requires experience and expertise, not to say a thorough overall knowledge of the available varieties, requirements, and the theory that goes with it.



By Amitava Chakrabarty | In: Marine Navigation |

Pub Time : 2021-02-03 10:29:13 >> News list
Contact Details
Qingdao Jerryborg Marine Machinery Co., Ltd

Contact Person: Brunhilde Lung

Tel: +86-19963866866

Send your inquiry directly to us (0 / 3000)