Seawater is the main cooling medium in our petrochemical plant. Failure of the seawater piping systems could lead to total shutdown of the plant. The main piping system in the plant consists of prestressed concrete cylinder pipe (PCCP), cement mortar - lined carbon steel, fiberglass and nickelcopper alloy N04400/ASTM B165 pipe. After more than fifteen years of experience with these materials, evaluation was made to select the most durable material for replacement projects and new construction.
This paper discusses the problems associated with each material, repair procedure and materials selection decisions for the long- term operation of the plant. Keywords: Seawater Piping, Cathodic protection (CP), Preventive Maintenance (PM), Prestressed Concrete Cylinder pipe (PCCP), Cement Mortar-Lined Pipe, Fiberglass (FRP) pipe, Alloy N0440W ASTM B165 pipe.