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

 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 41 of 84 
11.6 
SPREADER BARS, FRAMES & OTHER STRUCTURAL ITEMS OF LIFTING EQUIPMENT 
11.6.1 
Spreader bars, frames and other structural items of lifting equipment, if used, should be similarly 
treated, with load cases as above. A consequence factor shall be applied to spreader bars and 
frames, in accordance with Section 11.4.  
11.6.2 
Where a spreader bar, frame or other structural item of lifting equipment is certified, the certified 
capacity may be increased by any DAF that has been taken into account in the certified capacity 
before being compared against the dynamic loading enhanced by the applicable consequence factor 
from Section 11.4.  
11.7 
ALLOWABLE STRESSES 
11.7.1 
The primary structure shall be of high quality structural steelwork with full material certification and 
NDT inspection certificates showing appropriate levels of inspection. It shall be assessed using the 
methodology of a recognised and applicable offshore code including the associated load and 
resistance factors for LRFD codes or safety factors for ASD/WSD codes. Further details appear in 
Section 9.1 of 0001/ND, Ref. [1]. 
11.7.2 
Except for sacrificial bumpers and guides (see Section 17.5.4), the loading shall be treated as an LS1 
limit state. 
11.8 
INDEPENDENT ANALYSIS 
11.8.1 
Alternatively, GL Noble Denton will, if instructed, perform an independent analysis of the structure to 
be lifted, including the lift points, on receipt of the necessary information.
11 



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