Consideration of Differential Thermal Expansion Rates during Stress Analysis of Cladded Pipes

Abstract

The application of Corrosion resistance alloy (CRA) cladded pipes has become more customary across the Industry in recent years for high corrosive services (e.g. Sour gas). These pipes serve as a replacement not only to carbon steel pipes (Having high potential to corrosion over a period of time) but also as a replacement to expensive Alloy Steel / Stainless Steel pipes. CRA cladding technology involves application of a metallurgical junction on carbon steel pipes with an inner coating of high corrosion resistance alloy material (e.g. SS316, Alloy 625). This paper’s is intended to study the stress generated in the piping on account of differential thermal expansion Coefficients considering bimetallic approach while satisfying the ASME B 31.3 code requirements per para 301.7.3. Further results obtained are compared using analytical and finite element models.