Types Of Marine Fenders With Main Features

 

In modern ports, terminals, and shipyard engineering, marine fenders have become an essential component for ensuring berthing safety and extending the lifespan of infrastructure. With the continuous growth of global shipping volume, increasing ship tonnage, and the gradual complexity of berth structures, the impact energy faced by ports and shipyards during berthing is also constantly rising. If the fender systems are improperly designed, it can lead to damage to vessels or terminal structures, reduced operational efficiency, and even safety hazards.

 

Therefore, whether EPC contractors, port planning consultants, shipyards, or port operators, it is crucial to fully understand the structural characteristics, performance indicators, and applicable scenarios of various types of marine fenders to make optimal decisions in project design, procurement, installation, and maintenance. The correct selection of boat fenders or ship fenders can not only effectively protect vessels and wharves but also reduce long-term maintenance costs and improve port operational efficiency.

 

This article details the types of rubber fenders, providing a reference for port construction, terminal renovation, and shipyard projects.

 

 

 

 

Cylindrical Fenders

Cylindrical fenders are one of the most classic types of marine rubber fenders. Their cross-section is a solid cylinder, featuring simple structure and flexible installation, capable of evenly distributing berthing impact force. Cylindrical fenders are typically suitable for low to medium energy berths, such as small cargo ship berths, fishing ports, and light-duty shipyard berths. Their main advantages include quick installation, high durability, and low maintenance requirements, making them the preferred choice for many low-cost or temporary projects.

 

Although structurally simple, the energy absorption efficiency of cylindrical marine fenders can fully meet the needs of small and medium-sized vessel berths when properly designed. During construction, they can be installed via pile fixing or suspended arrangements, and the arrangement density can be adjusted according to the vessel's berthing direction to ensure even distribution of impact force and avoid excessive local stress on the hull. Regularly checking the tightness of steel cables or bolts can effectively extend the service life of these dock bumpers.

Features & Advantages:
* Uniform energy absorption across the cross-section, suitable for low to medium energy berths
* Simple structure, quick installation
* High durability, low maintenance requirements
Typical Applications:
* Fishing port docks, small cargo ship berths
* Inland river ports and light-duty berths
* Shipyard working berths

 

 

 

 

D-Shaped Fenders

D type fenders are usually used for light-duty berths or high-frequency berthing areas. Their flat back facilitates bolt installation or welding fixation, allowing continuous arrangement along the dock length. The semi-cylindrical shape of D-shaped rubber fenders provides flexible contact and is widely used for tugs, work boats, and industrial terminal berths. Their compact structure and low cost make them an ideal choice for small docks and light-duty berths.

 

The advantage of D-shaped wharf fenders in light-duty berths lies in their stability and economy under high-frequency use. During design, multiple continuous fenders can be arranged based on the berth length and the size of berthing vessels to ensure even force distribution during berthing. During construction, attention should be paid to the anti-corrosion treatment of fixing bolts and the tear resistance of the fender material to prevent deformation or damage during long-term use.

Advantages & Features:
* Low cost, easy to fabricate and install
* Provides continuous protection, adapts to high-frequency berths
* Compact structure, easy to arrange on small docks
Typical Applications:
* Tug, work boat, port service vessel berths
* Small industrial docks, logistics unloading platforms
* Yacht or light cargo ship berths

 

 

 

 

Arch Fenders

Arch fenders are one of the most widely used types of marine fenders in modern ports. Their V-shaped structure can effectively and evenly distribute berthing impact force while enhancing energy absorption capacity and shear resistance. They are suitable for medium to high energy berths, such as container terminals, Ro-Ro terminals, and general cargo berths. Arch fenders are typically installed with steel panels to enhance contact area and stability.

 

The V-shaped structure of arch marine rubber fenders effectively disperses impact force across the entire fender panel during berthing, reducing localized stress concentration and minimizing the risk of damage to the hull and terminal structure. During construction, close contact between the fender and the steel panel must be strictly controlled. Simultaneously, the fender size should be selected based on the berthing vessel's tonnage and the berth's design energy requirements to ensure long-term stability and reliability. For maintenance, regular inspections for fender deformation and panel fixation status can significantly extend their service life, contributing to effective marine impact protection.

Advantages & Features:
* High energy absorption, stable reaction force
* Strong shear resistance, suitable for angular berthing
* Low maintenance, long service life
Typical Applications:
* Container terminals, Ro-Ro terminals
* Port renovation and expansion projects
* General cargo berths

 

 

 

 

Cone Fenders

Cone fenders, due to their unique conical structure, maintain stability even under large deformation and provide extremely high energy absorption capacity. They are suitable for high-energy berths, such as LNG terminals, oil terminals, large container berths, and deep-water ports, making them the preferred type of marine fender for high-tonnage vessel berthing, offering excellent marine shock absorption.

 

Cone fenders can withstand the berthing impact of large-tonnage vessels while maintaining low reaction force, reducing pressure on the terminal structure. During installation, the steel panel needs to be robust and firmly fixed to ensure tight integration with the fender. Construction should consider the influence of tidal range, wind, waves, and vessel berthing angle on the fender. Regular inspection of the joint between the steel panel and the fender, along with timely maintenance of bolts and welded components, is essential. The high energy absorption capacity of cone fenders makes them perform exceptionally well in large deep-water berths and under high-frequency berthing conditions.

Advantages & Features:
* High energy absorption efficiency, low reaction force
* Excellent stability under large deformation
* Reliable long-term performance

Typical Applications:
* LNG terminals, large container berths
* Oil terminals and VLCC berths
* Large deep-water ports

 

 

 

 

Cell Fenders

 

Cell fenders achieve high energy absorption and low reaction force through a multi-cell rubber structure, providing uniform contact pressure. They are suitable for high-energy berths and are widely used in bulk cargo terminals, shipyards, industrial port deep-water berths, and other areas. Their high stability and durability stand out in large-scale engineering projects, making them key marine protection equipment.

 

Cell fenders are suitable for large-tonnage and high-energy berths. Their multi-cell design can evenly distribute berthing impact, protecting both the vessel and the terminal structure. During construction, it is necessary to ensure close contact between the panel and the fender to avoid localized stress concentration. Furthermore, the number and size of cells should be selected based on the vessel's displacement and the berth's energy requirements to meet the demands of long-term, high-frequency use. Regular maintenance inspections can prevent rubber fatigue or deformation, ensuring the fender operates stably over the long term.

Advantages & Features:
* High energy absorption, low reaction force
* Uniform contact pressure, reduces local stress on the hull
* Long lifespan, extended maintenance cycles

Typical Applications:
* Bulk cargo terminals, heavy-duty berths
* Shipyard outfitting berths
* Industrial port deep-water berths

 

 

 

 

Foam Fenders

Foam fenders are floating buoyancy fenders, lightweight, impact-resistant, and movable. They feature an outer layer of wear-resistant polyurethane and internal closed-cell foam that does not absorb water. They can float on the water surface, making them suitable for offshore operations, naval port berths, and temporary terminals, serving as effective anti-collision fenders in these contexts.

 

Due to their high buoyancy and mobility, foam marine fenders are highly suitable for temporary berths and offshore operating environments. During construction, they can be fixed via anchor chains or buoy systems to ensure berthing stability. Selection must consider vessel tonnage, berth depth, and sea conditions to choose the appropriate foam density and shell thickness, ensuring stable berthing even under windy and wavy conditions. Regular inspection of the outer coating wear and foam integrity helps extend the service life of these water fenders.

Advantages & Features:
* Unsinkable, high buoyancy
* Highly adaptable to berthing angles and hull positions
* Wear-resistant, puncture-resistant, simple maintenance

Typical Applications:
* Offshore operation platforms
* Naval ports, maritime vessel berths
* Temporary docks, floating berths

 

 

 

 

Pneumatic Fenders

Air-filled fenders are suitable for Ship-to-Ship (STS) operations and temporary berths. Inflated internally with an outer rubber protective layer, they can be deployed quickly and adapt to multi-angle hull berthing, offering high energy absorption and low reaction force, thus providing robust marine collision prevention.

 

Pneumatic fenders are suitable for rapid deployment and multi-vessel operations, commonly used for temporary berths or STS operations. During construction, air pressure should be adjusted according to the tonnage and frequency of berthing vessels. Regular checks of the rubber layer and pressure integrity are necessary to prevent performance degradation due to deflation or rubber aging. Their flexibility and energy absorption capacity make them stand out in emergency berths and short-term, high-frequency berths.

Advantages & Features:
* High energy absorption, low reaction force
* Strong stability during the berthing process
* Applicable to various vessel types and sizes

Typical Applications:
* Ship-to-Ship oil and gas transfer
* Temporary berths & emergency berths
* Temporary docks for overseas engineering projects

 

 

 

 

How to Choose the Right Rubber Fenders

When selecting rubber fenders, the core objective is to ensure vessel berthing safety while reducing the long-term maintenance costs of the terminal. Different working conditions and vessel types correspond to different fender requirements; therefore, selection should be based on several key factors.

 

Different types of marine fenders have distinct differences in energy absorption capacity, deformation performance, material properties, and installation methods. Improper selection may lead to unstable berthing, damage to terminal structures, or shortened fender lifespan. Therefore, matching the appropriate fender by considering the vessel type, berthing frequency, site environment, and structural conditions is key to ensuring the long-term stable operation of the project, ultimately supporting effective marine impact protection.

 

Factors to consider when selecting marine rubber fenders include:

 

Vessel Type & Berthing Mode
* Vessel tonnage and dimensions
* Head-on berthing, oblique berthing, or high-frequency berthing
* Different requirements for fenders from tugs, bulk carriers, tankers, etc.
Compatibility with Terminal Structure
* Whether the existing terminal beam-slab structure can withstand the fender reaction force
* Whether steel panels, anchoring systems, chain systems, etc., are needed
* Whether the force distribution is even after fender compression
Site Environmental Conditions
* Salt spray intensity
* Local temperature and UV radiation intensity
* Whether located in a berth with a large tidal range
Usage Frequency & Maintenance Cycle
* High-frequency berthing requires models with stronger compression recovery capability
* Need for simplified maintenance and reduced replacement frequency
Total Cost of Ownership
* Don't just look at unit price, but consider the comprehensive cost over 8–12 years
* Choosing manufacturers with stable materials, reliable structures, and technical support offers better cost-effectiveness

 

If you are planning port construction, terminal expansion, offshore engineering projects, or shipyard engineering, feel free to contact Shanghai Mountains. Shanghai Mountains is committed to providing high-performance, full-range rubber fender solutions for ports and engineering projects, helping your project achieve the optimal balance in safety, durability, and cost control.
* Engineering Selection Calculation
* Fender System Design
* Customized Production
* Comprehensive Quality Inspection
* Global Shipping & Technical Support