anchor test 1

What are the tests on Anchors ?

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:

  1. For stockless anchors include the weight of the anchor together with its shackle if any.
  2. For stocked anchors the weight of the anchor including its shackle, if any, but excluding the stock.
  1. 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.

  1. THE BENDING TEST ( CAST ANCHORS ).

An additional piece of metal, 8 in. long, is cast with the piece to be tested, & is cut away for the purpose of the bending test. This piece will be turned down to 1 inch  diameter  & bent cold by hammering through an angle of 90 degree  over a radius of 1.5 inch  the casting will be deemed sufficiently ductile if no fracture appears in the metal.

ALL ANCHORS ARE SUBJECT TO PROOF STRAIN, & SUBSEQUENT PROOF LOAD, BUT ONLY CAST STEEL ANCHORS ARE SUBJECT TO PERCUSSION, HAMMERING & BENDING TESTS. WROUGHT IRON, OR FORGED STEEL ANCHORS ARE NOT SUBJECTED TO THESE TESTS AS THEY ARE FORGED FROM RED TO SLAB BY HAMMERING. ALL OTHER ANCHORS WILL ALSO BE ANNEALED.

TO UNDERSTAND BETTER, PLEASE WATCH THIS VIDEO

manish-mayank