CLAD PIPING COMPONENTS FOR REFINERY APPLICATIONS

Production methods have been developed to establish clad piping system s as a practical solution to piping corrosion, maintenance, and reliab ility problems. Clad piping components have been utilized in oil produ ction, in nuclear power plants, and increasingly in the refining indus try to fake advantage of high alloy cladding materials that are metall urgically bonded to the inside diameter of carbon and alloy steel pipi ng. Installation practices utilize commercially proven fabrication and welding techniques with the added benefit of eliminating preheat and postweld heat treat (PHHT/PWHT) in most applications. Case histories o f clad piping installations in the refining industry and other applica tions ideally suited for clad piping components are reviewed in this a rticle. The results of a limited survey, reported in this article, rev eal that various forms of clad piping have been used in several differ ent refinery services including hot hydrogen (H-2/H2S) service up to 7 90 degrees F (420 degrees C). The methods used to make pipe, fittings, and prefabricated pipe spools are described.