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Seawater Pump Caisson Repair for Offshore Platforms

Seawater pump caissons on offshore structures house large pumps that draw seawater onto the platform for use in cooling, production and fire services. These caissons are notorious for suffering severe corrosion damage in the area around the pump caused by galvanic action between the pump and the caisson. The result is localised, severe corrosion of the caisson, which, in a relatively short time from platform commissioning, can cause holes through the wall. This leads to pump inefficiency and in the worse case can cause the caisson to fail.

When built, the caisson is protected against corrosion by anodes and / or chemical dosing systems against corrosion. However, when these defences are depleted and not renewed the corrosion that follows can be aggressive and rapid.

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