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 MECHANICAL
6.3.8 Piping -
n Pipe oil and lubricants (POL): Making repair/replacement
recommendations for above ground POL lines is very difficult because of
the many factors to consider. POL lines located near the waterfront
deteriorate about 50% faster than those away from the water. This
deterioration is due to the constant exposure to salt, water, and air if
above ground):
Waterfront
Repair
Less than 10 years old
Random or spot corrosion or rust
General good condition
Replacement
Over 10 years old
Wall thickness reduced 50% (NDT check)
Evidence of numerous repairs
Evidence of line stress (possibly due to hangar failure)
Many and major leaks
Large areas of deterioration or rust
Above ground, away from waterfront
Repair
Less than 20 years old
Little or no loss in wall thickness (NDT check)
Little or no rust or deterioration
Replacement
Over 20 years old
Wall thickness reduced 50% (NDT check)
Evidence of numerous repairs
Evidence of line stress (possibly due to hanger failure)
Many and major leaks
Large areas of deterioration or rust
6-48
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