GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 44 of 84
12.7.2
For subsequent lifting operations
using the same lift points, a visual inspection will be adequate
provided that:
a.
The visual inspection shows no damage to the lift point
material and welding
b.
The rigging system is similar to that used for previous lifts and that the lift points have been
designed
for that rigging system
c.
No excessive or uncontrolled loading has, or
suspected to have, occurred during the preceding
lifts
d.
All design utilisations for primary load transfer in the lift points are less than 0.8.
12.7.3
Where the visual inspection
shows that damage has occurred, appropriate repairs are to be taken
which shall be subject to the 100% visual, MPI and UT requirements given in Section 12.7.1.
12.7.4
Where excessive or uncontrolled loading has occurred, and member /weld utilisations are less than
0.8, all primary welds are to be inspected with 100% visual and 50% MPI with butt welds also tested
with 50% UT.
12.7.5
Where excessive or uncontrolled loading has occurred, and member /weld utilisations are greater than
0.8, all primary welds are to be inspected with 100% visual and 100% MPI with butt welds also tested
with 100% UT.
12.7.6
Where the rigging system used is different to the design rigging system, all primary welds are to be
inspected with 100% visual and 100%MPI with butt welds also tested with 100%UT.
12.7.7
For lift points with utilisations of primary load transfer members /welds greater than 0.8, the level of
inspection shall be a minimum of 100% visual, 20%MPI with butt welds also tested with 20%UT.
12.7.8
The extent of NDT shall be submitted for review.