4. What is the performance testing of pneumatic rubber fender ?
Manufacturer shall provide the certificate which confirms successful results of the tests which are evaluated by a major classification society and the performance confirmation of prototype fender test shall be done every ten years.
4.1 parallel compression test
To determine the performance of the fenders given in Clause 7, a performance test shall be performed. Applying a compressive force perpendicularly to the fender, the fender shall be compressed until its energy absorption reaches the GEA value. The compression speed shall not exceed 80 mm/min.
The reaction force and internal pressure shall be recorded at least every 5 % percentage deflection. The test shall be repeated twice with an interval of 5 min between the two tests. The energy absorption and the reaction force shall be obtained from the mean value of the two test records.
A fender meets the required GEA performance if it achieves 100 % of its GEA energy absorption without exceeding 65 % deflection and 110 % of its GEA reaction.
4.2 Angular compression test
An angular compression test shall be performed to determine the fender deformation property. If the fender is too large to be mounted on the testing machine, the test can be performed on a miniature-size fender. The reduction scale shall be such that it will ensure that the tests will be representative.
It has been shown that 1/30 or larger scale sizes are acceptable if relative performances at parallel and several angular conditions are to be compared at the same fender.
4.3 Durability test
A durability test shall be performed to verify that the products are suitable for use as fenders, and that they have sufficient durability to withstand the berthing energy.
The test shall comprise at least 3000 repetitive cycles of parallel compression from the original diameter to the maximum deflection. After 3 000 repetitive cycles, there shall be no cracks and other harmful defects on any part of the fender. No reduction of the GEA shall be accepted.
If the fender is too large to be mounted on the testing machine, the test can be performed on a miniature-size fender.
4.4 Compression-recovery test
Fenders are compressed and released repeatedly over a very short period of time. Therefore, a compression-recovery test shall be performed to confirm that the fenders have sufficient compression recoverability.
After compression of the fender to the guaranteed energy-absorption deflection, the fender shall be kept in this compressed state for 1 min, then the load shall be released instantaneously. The fender diameter shall recover more than 97 % of its original diameter within 5 min after the load to the fender is released.
The test shall be performed using an actual-size fender or a miniature-size fender larger than one-fifth the size of the actual diameter.
4.5 Puncture-resistance test
puncture-resistance test shall be performed to confirm that the products have sufficient puncture-resistance strength. The test shall be conducted in accordance with the static puncture test (CBR test) in ISO12236:2006.
The specimen shall be made using the same materials, construction, and production method, except for the number of ply of the reinforcement cord layer which shall be the number applied for the smallest size fender, i.e. normally two plies.
The force applied to break through the specimen shall be larger than 15 kN.