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 4.0 IN-SERVICE MAINTENANCE AND REPAIR
4.1 GENERAL
4.1.1 SCOPE. In-service maintenance and repair will be limited to the following:
Minor underwater repairs.
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Minor buoy and riser assembly repairs.
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Replacement of damaged buoys and/or riser assemblies.
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Minor repairs to cathodic protection systems.
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It should be noted that sufficient lift capability will be needed for replacement of
buoys and/or riser assemblies and, in many instances, for repairs. All of the
maintenance functions listed above are covered in this chapter except for cathodic
protection, which is discussed in Section 8.0.
4.1.2 EQUIPMENT. The following equipment must be readily available for use as
needed:
Crane barge or floating crane.
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Tugboat, mule, or other vessel (for maneuvering and positioning the
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crane platform).
High-pressure water pump and hose (for cleaning).
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4.2 PROCEDURES
4.2.1 BUOY REPLACEMENT (RISER-TYPE). A buoy in a riser-type system can be
replaced without removing the mooring. Proceed with the replacement as follows:
Lift the buoy out of the water and wash it down with seawater from a
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high pressure hose.
Secure the riser chain to a bitt or cleat with a wire rope sling.
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Detach the buoy from the chain by removing the anchor joining link or
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buoy shackle located directly under the buoy.
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