GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 60 of 84
17.4
BUMPER AND GUIDE FORCES
17.4.1
For offshore lifts, bumpers and guides should be designed to the following forces (where W = static
hook load) unless dynamic analyses are performed to justify alternative values:
Table 17-1
Default Bumper & Guide Forces (Offshore)
Lifting onto:
Fixed
platform
Floating
unit
Own
deck
Vertical sliding bumpers
Horizontal force in plane of bumper:
0.10 x W
0.20 x W
0.05 x W
Horizontal (friction) force, out of plane of bumper:
0.05 x W
0.10 x W
0.025 x W
Vertical (friction) force:
0.01 x W
0.02 x W
0.005 x W
Forces in all 3 directions shall be combined to establish
the worst design case
Pin/bucket guides
Horizontal force on cone/end of pin:
0.05 x W
0.10 x W
0.025 x W
Vertical force on cone/end of pin:
0.10 x W
0.20 x W
0.05 x W
Horizontal force in any direction shall be combined with the vertical force to
establish the worst
design case.
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