Revised C2 Stress Index for 90-degree Piping Elbows

The purpose of this technical paper is to present a methodology that has been used to show that, based on the NB-3200 definitions; the Piping Elbow C2 stress index can be smaller than the C2 stress index currently defined in the ASME-Code. The revised C2 stress index is derived through Finite-Element elasto-plastic calculations. A conservative practical approximation is presented for the calculation of the revised C2 stress index, based on the current ASME-Code equations. This revised C2 stress index leads to a revised Piping-Elbow K2 stress index which is greater than 1.0 and which is required because the maximum stress anywhere in the elbow is greater than the newly calculated secondary stress.

Provided by: Framatome ANP Topic: Software Date Added: Jul 2002 Format: PDF

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