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 TB 55-1900-201-45/1
b. After being tested, all of the gear shall be examined to ascertain whether any part has been damaged, per-
manently deformed by the test or has other visible defects. The pins and sheaves of all tested blocks shall be removed
for this purpose. If damaged during these tests, such gear will be satisfactorily repaired or replaced and retested.
c. The required examinations, as set forth in paragraph c of this section, may be accomplished by mechanical,
electrical or other means provided the method employed is equal in efficiency to the visual examination of disassembled
gear.
2-37. Test of Wire Rope. All wire rope used as shipboard cargo gear shall be able to withstand a breaking test load of
at least five times the safe working load. In the case of gear with a lifting capacity of over ten tons, the breaking test load
of wire rope shall be at least four times the safe working load.
2-38.
Proof Test Cargo Gear as a Unit.
a. Winches with their accessory gear, including the derricks and attachments, should be tested as a unit at least
once in every four years, with proof loads exceeding the safe working load (SWL) as set forth in Table 2-4.
b. The proof load applied to winches and their gear shall be lifted with the ship's normal tackle, including the
winches and with the boom at an angle which shall not be greater than 15 to the horizontal or to the lowest angle ap-
proved, in association with the design. When the load has been lifted, it shall be swung as far as possible in both direc-
tions.
c. When electrical winches are fitted with electromagnetic or hydraulic brakes at the winch, and also equipped
with mechanical brakes for manual operation, the brakes shall be inspected and tested for satisfactory operation.
d. Current for electric winch operation during the test shall be taken from the vessel's circuits. Shore current
may be used if it passes through the vessel's switch board.
Table 2-4. Safe Working and Proof Load of Assembled Gear
WORKING LOAD OF ASSEMBLED GEAR
PROOF LOAD
Not exceeding 20 tons
25% in excess
Over 20 tons but not exceeding 50 tons
5 tons in excess
Over 50 tons
10% in excess
2-23
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