When the energy to be absorbed by the rubber fender has been calculated in line with the preceding, the most appropriate rubber fender system can be selected. Each rubber fender manufacturer provides in his brochures the performance data of the various rubber fender types he produces. The actual performance of the rubber fenders not only depends on the type of rubber fender, the size and the elastomer material grade, but also on several external conditions. The performance of rubber fenders is (in most cases) influenced by angular compression, by the temperature, by the compression speed, etc.
The standard marine fender performance as presented in the brochures is the result of fender tests under certain ambient and compression conditions. The deviation from the standard rubber fender performance, as a result of the different conditions to be experienced on site, is to be taken into account when the final selection of marine fender.
Furthermore, the manufacturer’s brochures often indicate that the actual rubber fender performance may deviate (e.g. some 10%) from the figures quoted for both energy absorption capacity and reaction force. Chick this link to view our products brochures for reference: www.finerfender.com/jier-marine–fenders-catalogue-downloads/
It is common practice to adopt the performance figures at rated deflection as the reference; hence those figures should be higher than the calculated figures (taking into account the possible influences as described above).
The rubber fender performance is usually valid only if the marine fender has been preconditioned by compression to the rated values, at least three times before use. If not, the first maximum compressions produced by a vessel, may well give higher than expected reactions.
E.g. possible limitations with respect to the area to which the rubber fender can be mounted, limitations with respect to the maximum reaction force, the required stand-off distance, etc. Furthermore, it may be even the case that the moored vessel conditions are more critical than the conditions during the berthing procedure.
Feel free to contact us if you have any comments or inquires and one of our skilled staff representatives will contact you within the next business day.