0027/nd guidelines for Marine Lifting and Lowering Operations

CENTRE LINE 
CRANE #1 
CENTRE LINE 
CRANE #2 
B 
C/L CoG Envelope 
CoG Envelope 
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GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 84 of 84 
Hence, the derivation of loads is as follows; 
For Crane #1, total load to lift point 1 = [(14+0.8)*sin3] + [(13+0.9)*cos3] * (9+0.6) * W = 0.2794 * W 
[25*cos3 + (14-10)*sin 3]
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For Crane #1, total load to lift point 4 = [(14+0.8)*sin3] + [(13+0.9)*cos3] * (11+0.6) * W = 0.3376 * W 
[25*cos3 + (14-10)*sin 3]
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For Crane #2, total load to lift point 2 = [(10+0.8)*sin3] + [(12+0.9)*cos3] * (9+0.6) * W = 0.2607 * W 
[25*cos3] - [(14-10)*sin3]
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For Crane #2, total load to lift point 3 = [(10+0.8)*sin3] + [(12+0.9)*cos3] * (11+0.6) * W = 0.3150 * W 
[25*cos3] - [(14-10)*sin3]
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In order to account for the yaw of the structure, the loads to the lift points need to be increased by a 
yaw factor, see Section 5.4.7.  Assuming that the sling angles are small on the hooks and that there is 
no significant wind or tugger line loads, a yaw factor of 1.05 is to be applied.
Hence, to account for yaw, the vertical loads at the lift points are: 
For Crane #1, total load to lift point 1 = 0.2794 * W * 1.05 
= 0.2934 * W 
For Crane #1, total load to lift point 4 = 0.3376 * W * 1.05 
= 0.3545 * W 
For Crane #2, total load to lift point 2 = 0.2607 * W * 1.05 
= 0.2737 * W 
For Crane #2, total load to lift point 3 = 0.3150 * W * 1.05 
= 0.3307 * W 
These loads are to be used in the design of the rigging with the weight used to be in accordance with 
Section 5.2. 
 
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