Marine Order 32 (Cargo handling equipment) 2016

The proof load of a crane or derrick may be less than the load mentioned in Table 1 for the crane or derrick only if:

for a hydraulic crane - it is tested in accordance with paragraph 2(1)(b) or 2(2)(a); and

it is not practical for the crane to raise the full test load; and

the reduced test load is at least SWL x 1.1.

A derrick rigged in union purchase must be rigged in accordance with the rigging plan mentioned in clause 1 of Division 1 of Schedule 6, with a proof load based on the SWL mentioned in the plan.

For a crane or derrick, the load imposed on any accessory block, topping lift, shackle, preventer, guy or other accessory part must not exceed the SWL of the part by more than the proportion by which the proof load exceeds the SWL of the crane or derrick.

The proof load for a test of a crane, including a derrick crane, a derrick in union purchase or the initial test of a derrick, must be applied by hoisting movable weights.

The proof load for a test of a derrick or derrick crane, following renewal of a part or repair, must be applied by hoisting movable weights, a spring, hydraulic balance or similar appliance.

The proof load must be applied:

with the derrick boom or crane jib at its minimum working angle or, for a crane or derrick crane, its load radius, measured from the horizontal plane and stated in the certificate of test; or

for a variable length jib crane - with the jib at its maximum and minimum operating lengths, stated in the certificate of test, and at a length approximately midway between maximum and minimum.