Marine pipelines are used for liquid transfer, such as at a petroleum-oil-lubrication (POL) facility, sewer outfalls from treatment facilities, and general utilities, such as gas and water. Pipelines are constructed of such materials as steel, cast iron, concrete, plastic, and aluminum. Undersea pipelines typically are subject to most of the same hazards as undersea cables, including anchors, scouring, ice, marine organisms, and earth-mass movement.

The main disadvantage with steel pipe is its susceptibility to corrosion, which can be counteracted by cathodic protection. Deterioration of the pipe will usually occur if the cathodic protection system is faulty. A sacrificial anode system will fail when the anodes either erode completely or become ineffectively small. A faulty impressed current system is usually caused by broken wires or missing electrical connections.

Estimated Time Requirements for Cable Repair Operations

Task Description

Estimated Time Required (days)

Stern of splice barge plumbs capped end. Diver attaches retrieving line. Haul splice barge stern as first capped end is hauled up to barge, into chute, and brought into position for splicing.

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