5.2.2 Anchors are to be of an approved type.
5.2.3 Material selection for drag embedment anchors are, generally, to be in
accordance with Pt 4, Ch 2, 4 Steel grades, taking the structural category as
‘Primary’.
5.2.4 Supporting calculations to verify the structural strength of the anchor
for design service loads and for proof test loads are to be submitted.
5.2.6 Anchors are to be subject to proof test loading in the manner laid down
in the Rules. The level of proof test loading for positional mooring anchors is 50
per cent of the minimum rated breaking strength of the attached anchor line.
5.2.7 Proof load testing of large fabricated anchors (in excess of 15 tonnes
mass) may be waived for classification, subject to the following:
- Structural strength of anchor type being verified by finite
element analysis procedure.
- All main structural welds being subject to non- destructive
examination as follows at manufacture:
- 100 per cent visual.
- 100 per cent MPI.
- 100 per cent UT/radiographic, for full penetration
welds.
5.2.8 Not withstanding the above, attention is drawn to the separate
requirement of some National Authorities for proof load testing of anchors.