UFC 4-159-03
3 October 2005
Table 3-17. (Continued) Inspection Guidelines
NOTES
MAXIMUM
MOORING
INSPECTION
SYSTEM OR
INTERVAL
COMPONENT
0-3 years of service
Ship's chain
36 months
4-10 years of service
24 months
>10 years of service
18 months
(American Petroleum Institute (API) RP
2T, Recommended Practice for Planning,
Designing, and Constructing Tension Leg
Platforms)
0-2 years of service
Wire rope
18 months
3-5 years of service
12 months
>5 years of service
9 months
(API RP 2T)
3-11
MAINTENANCE. If excessive wear or damage occurs to a mooring
system, then it must be maintained. Fleet mooring chain, for example, is allowed to
wear to a diameter of 90 percent of the original steel bar diameter. As measured
diameters approach 90 percent, then maintenance is scheduled. Moorings with 80 to
90 percent of the original chain diameter are restricted to limited use. If a chain
diameter reaches a bar diameter of 80 percent of the original diameter, then the
mooring is condemned. Figure 3-11 illustrates some idealized models of chain wear
3-12
GENERAL MOORING GUIDELINES. Experience and practical
considerations show that the recommendations given in Table 3-18 will help ensure
safe mooring. These ideas apply to both ship mooring hardware and mooring facilities.
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