Civil Engineering Reference
In-Depth Information
FIGURE 7.46
Fiberglass mud-mat system.
A fiberglass mud-mat system is significantly lighter than steel, ranging from
44 to 58 kg/m
2
in air and 49 to 58 kg/m
2
submerged.
Mud mats constructed of fiberglass have the following advantages:
High flexural strength
●
High flexural stiffness
●
Reduced number of support beams
●
Reduction in fabrication costs
●
Reduction in anodes
●
Lighter weight
●
Easy installation
—
no bolting.
●
Several companies have used fiberglass mud mats on approximately 20
jackets in the Gulf of Mexico since the late 1990s.
7.12.17 Case Study: Repair of the Flare Jacket
The flare in this case was constructed in 1970. A survey showed cracks on the bra-
cing due to corrosion (
Figure 7.47
). The flare jacket leg-brace clamps were
designed in 1984 but were not fitted until 1994. They are ungrouted, loose and
heavily corroded. The vertical diagonal braces in all three elevations in vertical
intervals between the upper bay are totally corroded, with extensive holes through
most of perimeter. The horizontal braces in all three elevations are totally corroded,
with extensive holes through most of the perimeter. Visual inspection revealed that
the roller bearings at deck level supporting the flare bridge are highly corroded and
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