Guide to fenders Trelleborg Marine Systems | Takes the pressure off

Fenders – more than just a ‘block of black rubber’ Port owners and operators spend millions of dollars each year developing safe and efficient port facilities. However, this can easily be put at risk by abnormal berthing of vessels and inadequate design of fendering and marine protection structures. Bringing a moving vessel to rest against a dockside requires the vessel’s kinetic energy to be dissipated, or absorbed, by a protective fender to prevent structural or vessel damage. As vessel sizes have increased in recent years, the energy absorption demands placed upon a fender systems have also...

A fender for every requirement There are a wide variety of fender systems to meet every possible berthing requirement, whether shipto-shore or ship-to-ship, which can be broken down into three main types: • The buckling fender Either with a front panel and rubber cone, or direct contact • The pneumatic fender Either foam or gas filled pneumatic cylinder • The side loaded fender A cylindrical torsion bar system Benefits of performance characteristics Circular or cone shape with panel contact Buckling Type Types of Fenders Longitudinal shape with panel contact Buckling type with direct contact...

Main components of a fender system Choosing the right fender Rubber fender Chains and accessories (U-anchors, brackets & shackles) Steel panel paited with corrosion protection paints UHMW PE facing Fender fixing anchors & bolts Steel Panels • teel panels with ultra high molecular weight poly S ethylene UHMW-PE facing are used to distribute reaction forces into the hulls of berthing vessels. • anels are designed to suit the berthing P conditions considering many design parameters and environmental factors. Restraining movement Chains are used to restrain fender movement; there are three types...

Design procedures Energy – the guiding force Conservation of energy is the guiding principle for general fender design procedures. Firstly, it’s important to calculate the energy that will be delivered by the impact of the heaviest vessel berthed and then select the fender design capable of absorbing the energy, without exceeding the maximum allowable force on the pier. • nergy absorption exceeds effective impacting E energy of ships • eaction force is less than the structures R allowable reaction force • urface pressure, or hull pressure, is less than S the allowable hull surface pressure •...

Advanced fenders require advanced manufacturing Not just a ‘block of black rubber’ The increased demands placed on contemporary fender systems requires a highly-considered design with the highest quality materials and bespoke rubber compounds, using the most innovative manufacturing processes. The load/ deflection characteristics commonly known as the performance of the fender is very much dependent on the manufacturing process. The fender manufacturing process involves: • • • Vertical Compression Carried out at various speeds and temperatures Compound formulation and mixing of rubber compounds...

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