Experience With Simplified Inelastic Analysis of Piping Designed for Elevated Temperature Services

Abstract

Screening rules and preliminary design of FFTF piping were developed in 1974 based on expected behavior and engineering judgment, approximate calculations, and a few detailed inelastic analyses of pipelines. This paper provides findings from six additional detailed inelastic analyses with correlations to the simplified analysis screening rules. In addition, simplified analysis methods for treating weldment local stresses and strains as well as fabrication-induced flaws are described. Based on the FFTF experience, recommendations for future Code and Technology work to reduce design analysis costs are identified.