Procedure for Testing Offshore Pedestal Cranes
The proof load test weight as stipulated by the SOLAS Regulations for pedestal cranes is attached and lifted clear of the deck as the crane jib is boomed out to maximum reach. It is then slewed as far as possible in a clockwise direction, then in an anticlockwise direction and the weight removed.
The jib is then boomed into the shortest reach and the stipulated test weight for this radius attached. It is rotated as before, clockwise and anticlockwise and the weight removed.
During these operations the winch drum brakes are operated and seen to be working satisfactorily.
All this is witnessed by the yard Certification Authority and the engineer, usually from the crane cab (gets a bit crowded at times)
All the attachment welds are subjected to post-test NDT and the pedestal is post-test surveyed for verticality. These reports are given to the engineer in charge.
Once all the reports are scrutinized by all parties a load test certificate is issued. This enables the yard rigging department to utilize the crane for the rest of the construction phase, the client is usually agreeable to this as it gives the crane a good running in period, any adjustments being made much cheaper onshore than offshore in the North Sea.
The crane load test certification is sent offshore at sailaway….