BV Rule of Anchor Chain Calibration

Anchors, Windlasses and Chain Cables are to be ranged and examined, and the required complement and condition are to be checked. When the ship is more than 5 years old, chain cables are to be gauged. Any length of chain cable which is found to be damaged or excessively worn is to be renewed.

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DNVGL Rule of Replacement of Crane Wire Rope

Note that there are no rules which require replacement of  crane wire rope every 5 years. It is up to the Crane Maker to decide whether the replacement of wire rope is mandatory within certain period of time.

During annual and 5 yearly surveys, when the thorough examination is carried out, DNVGL may require replacement of wire rope when the limits of wear down or any damage is recorded. However there are no time periods, where even in case of good wire rope condition, it shall be replaced.

DNVGL Rule of Test Loads for Cranes and Derrick Rigs

The test load to a lifting appliance shall exceed the safe working load (SWL) of the appliance as follows:

Test load for cranes and derrick rigs:

 Safe working load Test load
 Up to 20 tonnes 25% in excess of the SWL
 Exceeding 20, but not exceeding 50 tonnes 5 tonnes in excess of the SWL
 Above 50 tonnes 10% in excess of the SWL

 For hydraulic cranes where, due to limitation of hydraulic oil pressure by the safety valve, it is not possible to lift a test load in accordance with Table, it will suffice to lift the greatest possible load. Generally this should not be less than 10% in excess of the SWL. It is then, however, assumed that the structure is load tested with a load reflecting the overload based on the reference SWL by means of other methods.

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