No matter how good the marine fenders unit might be, the whole integrity of a fender system is compromised by poor quality and/or badly designed accessories. This trend has reached dangerous levels with inadequate or weak specifications and pressures to cut prices.

JIER Cylindrical Marine Fenders System, Installed on Port of Qingdao

Tip 1. Inadequate paint and corrosion allowances mean high maintenance and early replacement.

No paint lasts forever; 10-15 years being typical. After this, the steel will corrode and weaken unless corrosion allowances are added. If corrosion allowances are not specified, they will invariably be ignored and the life expectancy of the panel will be drastically reduced. For cold water climates, a corrosion allowance of 3mm per exposed face might be suitable, much more where temperatures are higher and corrosion is greater.

Tip 2. Internal construction of a large panel with deep channel section reinforcement (before welding).

Frontal Panels of a fender system need to resist combinations of bending, shear and local buckling. There are many ‘limit state’ design codes (BS5950, etc) and finite element software packages able to determine these loads and stresses, but very often unqualified persons use simplistic methods or even guesswork that lead to dangerously weak and under-designed fabrications.

Frontal Frame, the most important component of Marine Fenders System

Tip 3. Cost cutting and ignorance of design codes often leads to serious fender accidents.

Nobody can afford to buy the cheapest. If price becomes the sole purchasing criterion, then it is the end user who ultimately loses. He takes risks with the health and safety of staff, and risks accidents and damage to ships and structures. He also risks the high ongoing costs of maintenance and early replacement of the fenders. The only solution is better specifications and measures to ensure that these are adhered to.

Tip 4. Corrosion of chains and accessories are a principle cause of early fender failure.

Any fender system is only as good as the weakest component. Calculations for loads should be presented, and fixings selected accordingly. Chains are always a maintenance item and this should be considered in the specifications. Galvanising may last around five years, after which loss of diameter quickly weakens the links. Routine maintenance means chains should be easily and inexpensively replaceable, whilst permanently embedded items, like anchors, must last the life of the fender system.

Steel Bars, Accessories of Cylindrical Marine Fenders, JIER

Tip 5. Thin panels cannot resist bending, shear or local buckling.

International Navigation Association (PIANC) recommends 12mm as the absolute minimum when exposed to seawater on both faces, 10mm for exposure to one face and 8mm for internal sections not exposed to corrosion. This means a frontal panel of fender system should be a bare minimum of 160-180mm thick if standard internal steel channels are used to stiffen it. Bigger systems often need panels 250-400mm thick.

Frontal Frame, including Steel Panel and Facing Pad, accessories of Marine Fenders Systems

Tip 6. Computer modelling can be used to predict fender performance before expensive mistakes are made.

Tip 7. Testing of materials and rubber fenders ensures quality standards are maintained.

Learn more about JIER quality control center here.

JIER Marine Fenders

We JIER have been committed to provide the ideal marine fender system solutions combine high performance and cost effectiveness for decades. Our professional technicians and engineers are backed up by the most experienced engineering and manufacturing experts in the business.

Learn about JIER Marine Fenders Products here.

Arch Fender
JIER manufactures two types Arch Fenders, JDA-A and JDA-B. The JDA-A fender has a rubber contact face ideal for all general purpose applications...
Cylindrical Fender
Cylindrical Fenders are simple to install and operate which makes these units an economical solution for remote locations and for multi user berths...
Cone Fender
All Cone Fenders are single piece mouldings so they are robust, long lasting and easy to install. UHMW-PE faced steel frontal frames are generally used...
Super Cell Fender
Cell Rubber Fender here mentioned is improved over the ordinary type. It has high absorption energy per unit weight and low tilt compression performance...
D Fender
D Fenders can be pre-curved, chamfered and drilled to aid installation at a relatively low cost and can also be cut to the length required ...
Wing Fender
JIER Wing Type Rubber Fenders are developed on the basis of D Type Rubber Fenders. They can be fixed with double line anchors which greatly ...
Square Fender
Square Rubber Fenders offer similar advantages to D fenders and are typically used where a stiffer fender is required. Square Rubber Fenders...
Unit Element Fender
Unit Element Fenders are a high performance, modular system. Element Fenders can be combined in unlimited permutations of length, orientation and Energy...
Roller Wheel Fender
Roller and Wheel Fenders are commonly used on the berth corners and dock entrances, also widely installed along the walls of dry docks and other...
Tug Fender
Tug fenders must work harder, for longer and under more adverse conditions than any other fender type. Tug fenders can be divided into three main types...
Pneumatic Rubber Fender
Pneumatic Rubber Fenders have been in use for around 50 years. The development of the Pneumatic Fender has progressed through ...
Foam Filled Fender
Foam Filled Fenders are versatile, robust and suitable for almost all applications. The manufacturing process allows for virtually any size of fender to be...
Keyhole Fender
Keyhole Fenders are made of high abrasion resistance rubber. They are specially designed for tugboats and workboats.
Rubber Ladders
Rubber Ladders Fenders are very robust. They are flexible to reduce accidental damage and help protect the wharf from small craft berthing.
Rubber Pads
Rubber Pads (Plates) are designed and produced for the protection of barges, tugboats, water locks and quay walls.

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