Quantcast Appendix E Anchor Pull Test Requirements

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APPENDIX E
ANCHOR PULL TEST REQUIREMENTS
1.0
GENERAL. This appendix establishes the procedures for setting and pull
testing of anchor legs. Tables of predicted anchor system drag distance are included
to assist in initial anchor positioning.
1.2
SETTING DRAG ANCHORS. Proof setting of each anchor leg should be
accomplished using harbor tugs, Fleet tugs or by pulling diametrically opposite
anchor legs against each other. When setting the anchor, it is desirable to have a 10
to 1 scope (see Figure E-1 for definition) in the mooring line. This may be
accomplished by adding chain or a work wire. The anchor drag distance to achieve
the specified load level must be known to enable proper anchor placement prior to
proof loading. Setting shall be accomplished by pulling to the design load of the
mooring.
Scope is the ratio of length of rode (L) to depth of water (D), plus allowance for heigth of bow above water. At (1)
length of rode equals the depth. At (2) rode length is twice the depth, at (4) four times the depth. Note how the angle be-
tween rode and bottom decreases. At (B) the scope is 8:1 and the short length of chain at the anchor lies flat on the bottom.
Figure E-1. Mooring Leg Scope
1.2.1 DRAG DISTANCE
Single Anchors. The predicted anchor drag distance for single anchors
q
can be obtained from Table E-1.
E-2





 


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