How to Test Foam Filled Fenders ?

A complete testing for foam filled fender should includes following items.

  • Fender compression test.
  • Fender cyclic-compression test.
  • Skin thickness test.
  • Fender material and dimensional testing.

Taking Dia.2000mm×L3000mm foam filled fender as Test Sampling:

Performance testing: 10% of the production lot (minimum of one) for fenders less than 2000mm diameter and 3000mm length. For larger fenders, submit scale model test report from a previous fender test (within 3 years).

Cyclic compression: One of the production lot for fenders less than 2000mm diameter and 3000mm length. For larger fenders, submit scale model test report from a previous fender test (within 3 years).

Skin Thickness (3rd party witness): 10% of the production lot (minimum of one).

Dimensional testing: 100% of the production lot.

Material testing: 100% of the production lot, per factory ITP.

Test Procedures

Testing of fenders from the production lot shall be as follows: I, [Fender Compression Test (For fenders less than 2000mm diameter and 3000mm length): Test 10% of fenders from the production lot. Compress the fender along its diameter between two parallel flat plate surfaces to a compressed dimension of 40 percent of its original diameter.

Record load and the corresponding deflection at one-inch increments and plot as a graph of load versus deflection. The load-deflection curve shall then be integrated to generate an energy-deflection curve for the fender.

The fender shall meet the energy and force performance requirements of the paragraph entitled “Performance Requirements.”

After compression of the fender to 40 percent of its original diameter (60 percent compression) the fender shall rebound to 90 percent of its original diameter within two minutes after the load is removed, and to 95 percent of its original diameter within 30 minutes after the load is removed.

test procedure
1. The test apparatus shall be equipped with a calibrated load cell (or pressure transducer) and linear transducer.
2. The test apparatus shall be capable of recording and storing load cell and transducer data of 0.01H-0.05H, where H is the fender’s nominal height. Sample details/ calibration details shall be recorded.
3. 10% of the production order quantity of fenders shall be selected at random from the production lot to establish quality control testing.
4. Before conducting the performance test, stabilise fender temperature at 23+ 5 deg C for at least 24 hours.
5. Compression speed to be at 1-150 mm/s constant velocity
6. Compression angle is 0 deg (vertical compression)
7. Break in the test fender by deflecting one cycle to its rated deflection.
8. Remove load and allow fender to recover up to one hour.
9. Test fender performance by deflecting a second cycle to its rated deflection.
10. Evaluate the recorded data and produce load vs deflection curves for energy and reaction force.
11. For slow test speeds (1-10 mm/s), adjust performance with velocity correction factors.
12. Adjust performance with temperature correction factors (if required).
13. Adjust performance with angular correction factors (if required).
14. Provide a written test report with performance graphs.
Pass/Fail: The fender shall absorb the specified energy (- 10 ‘)/0) with a corresponding specified force (+ 10 %). This energy absorption performance shall be achieved prior to the point at which the deflection of the fender exceeds 60 % of its initial diameter. If one fender fails the performance test, an additional 10% of the production lot shall be tested.

Failed fenders shall be replaced and retested.

Fender Cyclic-Compression Test (For fenders less than 2000mm diameter and 3000mm length):
Test one fender from the production lot. Compress the fender along its diameter between two parallel flat plate surfaces to a compressed dimension of 40 percent of its original diameter. Release the load and recompress as before.

Repeat the compression and release cyclic loadings for a minimum of 10 full cycles of compression. The fender may be rotated 90 degrees after 5 cycles of compression. A five-minute interval shall be provided between cycles. Permanent deformation, cracking, or tearing of the fender skin, fender core, or end fittings shall constitute failure of this test.

Skin Thickness Test (3rd party): Test 10% of fenders from the production lot. Before delivery of all of the fenders to the construction site, perform a minimum of 2 skin thickness tests per each test fender to be delivered. Test locations shall be mid-body and at one conical end.
Each test shall consist of taking a 6mm diameter (minimum) to 12mm diameter (maximum) core from the fender skin, which can be removed from the skin and examined for thickness of elastomer and placement of reinforcing.

Take skin thickness measurements from the core sample and record measurements noting placement of reinforcing. Where the skin thickness measurement is less than the specified minimum by more than 10 percent, reject the fender. In addition, if the average of skin thickness tests for one fender is not equal to or greater than the specified minimum, reject the fender.

If the tested fender is rejected the manufacturer shall then conduct thickness tests for an additional 10% of the production lot fenders, Replace rejected fenders with fenders meeting the provisions of this specification. Test replacement fenders for skin thickness as specified herein. Tests shall be witnessed by a certified and independent inspection agency, such as ABS, BV, CCS.

The manufacturer shall provide notification at least 10 working days prior to conducting skin thickness tests. After skin thickness testing, patch core (holes with elastomer of the same composition and thickness as the specified elastomer skin. Nylon reinforcing is not required in core patches.

Dimensional Testing: The manufacturer shall test 100% of the fender order to be delivered. Tests shall be conducted at the factory by the quality control department in accordance with ISO and ABS standards.

Dimensional Testing shall include:
1. Skin Thickness: (-10%)
2. Fender Diameter: (+1-4%)
3. Fender Length: (+1-4%)
Material Testing: The manufacturer shall show material certificates for 100% of the fender order to be delivered. Tests shall have been conducted at the factory by the quality control department, by the material supplier, or by a qualified 3rd party laboratory in accordance with ASTM standards.

A test report or certification from the quality control department shall be issued stating conformance to the above test requirements and to the requirements of this specification.
 
Contact Jerryborg Marine for more testing specifications for foam filled fendertest procedure.

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