All anchors over 168 lb ( 76 kg ) in weight must be tested & issued with a test certificate. The weight of any anchor for the purpose of the rules & regulations governing anchors & cables shall:
- For stockless anchors include the weight of the anchor together with its shackle if any.
- For stocked anchors the weight of the anchor including its shackle, if any, but excluding the stock.
- DROP TEST ( CAST ANCHORS )
Any part of an anchor over 15 cwt is subjected to a percussion test by being dropped both end on & side on from a height of 12 feet on to an iron or steel slab.
After that, the piece must be slung & hammered all over by a 7 lb sledgehammer. A clear ring must be produced to show that no flaw has developed during the percussion test.