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 17 of 84 
Term or Acronym 
Definition 
Weather restricted 
operation 
A marine operation which can be completed within the limits of an 
operational reference period with a weather forecast not exceeding the 
operational criteria. The operational reference period (which includes 
contingencies) is generally less than 72 hours. 
The design environmental condition need not reflect the statistical 
extremes for the area and season. 
An alpha factor shall be accounted for in defining the design environmental 
condition. See Section 7.4.8 of 0001/ND, Ref. [1].
Weather unrestricted 
operation 
An operation with an operational reference period greater than the reliable 
limits of a weather forecast. The operational reference period (which 
includes contingencies) is generally more than 72 hours. The design 
weather conditions must reflect the statistical extremes for the area and 
season.
The design weather is defined in Section 7.3 of 0001/ND, Ref. [1].
WLL / 
Working Load Limit
The maximum force which a product is authorised to sustain in general 
service when the rigging and connection arrangements are in accordance 
with the design. See SWL. 
WSD 
Working Stress Design (effectively the same as ASD) 


GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 

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