Page 10-11 - banneredGoodyear Marine Fenders

GUIDELINES
FOR DOCK FENDER SELECTION
There are many service factors which must be taken into consideration when making a decision on which type and size of fender is best
suited for a given application: type of pier structure, type and size of vessel, berthing velocity of vessel, method of berthing, sea currents and
wave action.
Some of the most common applications of the various types of fenders o ered by Goodyear Engineered Products are as follows:
Cylindrical Fenders
are normally used where tidal conditions and flexible mounting is desired. Cylindrical fenders are usually suspended on a chain for easy installation.
Rectangular Fenders
are normally used where rigid mounting is desired. For example on tugs, or where tidal conditions do not exist and berthing is at a low angle.
Rectangular fenders are also used in combination with wood facing on light concrete structures where the load imparted to the dock structure must be
kept low. The wood facing spreads the berthing impact over the surface to avoid concentrated loads on any one point.
Trapezoidal Fenders
are used with or without timber facing where the dock structure and/or the vessel are unable to withstand large reaction loads. Because Goodyear
Engineered Products trapezoidal design is engineered to efficiently utilize more of the elasticity naturally inherent in rubber, a smaller section of trapezoidal
fendering will absorb a greater amount of impact when compared to other cross sections.
D Shape and M Series Fenders
are normally used on tugs or barges. Their cross sections are designed for solid mounting and complete coverage as well as high energy absorption.
Wingtype
Wingtype dock fenders are used with or whithout timber facing. Wingtype fenders are engineered to efficiently utilize more of the elasticity
naturally inherent in rubber. They may be used for solid mounting and for complete coverage on tugs and barges.
Note : A physical property of rubber is that it has to be "broken in". On the initial compression of a rubber fender, the load required for a given deflection
is relatively high. During this first compression the rubber molecules re-align themselves. For subsequent compression cycles, the load to deflect the
fender a given amount will be less than the first compression and will remain consistent throuthout the life of the fender. The data used for the load
and energy curves on the following pages was developed from fender samples that were broken in.
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