GUIDELINES FOR MARINE LIFTING & LOWERING OPERATIONS 0027/ND Rev 11 Page 12 of 84 3 DEFINITIONS & ABBREVIATIONS 3.1
Referenced definitions are underlined.
Term or Acronym Definition 9-Part sling
A sling made from a single laid sling braided nine times with the single laid
sling eyes forming each eye of the 9-part sling.
Added Mass
Added mass or virtual mass is the inertia added to a system because an
accelerating or decelerating body must move some volume of surrounding
water as it moves through it, since the object and fluid cannot occupy the
same physical space simultaneously.
This is normally calculated as Mass of the water displaced by the structure
multiplied by the added mass coefficient.
Added Mass
Coefficient
Non-dimensional coefficient dependant on the overall shape of the
structure
Alpha Factor
The maximum ratio of operational criteria / design environmental condition
to allow for weather forecasting inaccuracies. See Section 7.4.8 of
0001/ND, Ref. [1].
Approval
The act, by the designated GL Noble Denton representative, of issuing a
Certificate of Approval
ASD
Allowable Stress Design (effectively the same as WSD)
Barge
A non-propelled vessel commonly used to carry cargo or equipment. (For
the purposes of this document, the term Barge can be considered to
include Pontoon, Ship or Vessel where appropriate).
Bending Factor
b
A partial safety factor that accounts for the reduction in strength caused by
bending round a shackle, trunnion, diverter or crane hook.
Cable-laid sling
A cable made up of 6 ropes laid up over a core rope, as shown in IMCA
guidance, Ref. [7], with a hand spliced eye at each end.
Certificate of
Approval
A formal document issued by GL Noble Denton stating that, in its
judgement and opinion, all reasonable checks, preparations and
precautions have been taken to keep risks within acceptable limits, and an
operation may proceed.
Competent person
Someone who has sufficient training and experience or knowledge and
other qualities that allow them to assist you properly. The level of
competence required will depend on the complexity of the situation and the
