0027/nd guidelines for Marine Lifting and Lowering Operations

5.9 
LIFT STABILITY 
For lifting operations carried out where the Centre of Gravity of the lifted object is above the lift points, 
care should be taken to ensure that the stability of the lifting arrangement is considered in the design.
This is of particular concern where spreader bars or spreader frames are used as part of the lift 
system. Stability should be demonstrated for these conditions allowing for both vertical and horizontal 
offsets in the position of the Centre of Gravity. 
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GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 28 of 84 
6 
DERIVATION OF HOOK, LIFT POINT, AND RIGGING LOADS 
6.1 
INTRODUCTION 
6.1.1 
The following sections determine the loads to be used for confirming the suitability of the cranes and 
for the design of rigging components using the parameters laid down in Section 5.
6.2 
HOOK LOADS 
6.2.1 
The total loading on the crane hook(s) should be based on the lifted item Design Weight, where the 
Design Weight is as follows: 
Design Weight = Net Weight x Weight Contingency Factor (see Sections 8.3.1 to 8.3.3 of 
0001/ND, Ref. [1]) or 
Design Weight = Weighed Weight x Weight Contingency Factor (see Sections 8.3.8 and 
8.3.9 of 0001/ND, Ref. [1]), or 
Design Weight = NTE Weight x Weight Contingency Factor (see Section 8.1.1, 8.1.2, 8.3.5 
and 8.3.6 of 0001/ND, Ref. [1]). 
Note: for piles, the Design Weight shall be calculated based on Section 8.3.4 of 0001/ND, Ref. [1]. 
6.2.2 
For single crane lifts, the hook loads are as follows: