Civil Engineering Reference
In-Depth Information
Lifting calculation
Is the item
weighted?
Gross lift weight
=
weighed weight
×
1.03
Gross lift weight
=
calculated weight
×
1.05
Is lift
floating?
Will crane
move other
than luffing or
slewing?
DF from
Table 5.5
Use inshore
factor
DF
=
1.0
Lift weight
=
Gross lift weight
×
DF
FIGURE 5.28
Procedure for calculating lifting weight.
Spreader bars or frames, if used, should be similarly treated, with load cases
as above. A consequence factor of 1.35 should be applied to lift points, and a
factor of 1.15 should be applied to members directly supporting the lift points,
as presented in
Table 5.7
.
Stress levels should be within those permitted by the latest edition of a recog-
nized and applicable offshore structure code. The loads should be treated as a nor-
mal serviceability level functional load with associated load and resistance safety
factors. In the case of a working stress code, the one-third increase in strength by
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