0027/nd guidelines for Marine Lifting and Lowering Operations



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0027-nd rev 11.2 8-jul-16 guidelines for marine lifting and lowering operations

GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 12 of 84 

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 
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