Assessment of Existing Structures and Repairs - Offshore Structures: Design, Construction and Maintenance - page 527

FIGURE 7.32 Vibration monitoring attached to the deck beam.
7.12.3 Jacket Repair
There are many methods for strengthening and repairing an offshore structure
platform. The main element of repair is the clamp.
Figure 7.33 presents the traditional procedure for repairing severe corrosion
of a leg. The repair depends on removing the corroded part of the leg, fixing the
half cylinder around the leg, then placing the other half, which will connect by
bolts, and finally reinstalling the bracing by a clamp to the repaired leg (as
shown in the figure).
The method of repair when a buckling bracing member requires strengthen-
ing is shown in Figure 7.34 . As shown in the figure, the buckling member is con-
nected from the midpoint to the leg by two clamps on the leg and on the bracing.
Corrosion of a horizontal member is shown in Figure 7.35 . The main prin-
ciple of strengthening this member is adding a new horizontal member that will
be connected to the corroded member by clamps.
Clamps can also be used to strengthen all the jacket faces, as shown in
Figure 7.36 .