Prediction of Residual Life of High Temperature Piping by Creep Internal Stresses

Creep internal stress of high temperature piping measured by constant strain rate (CSR) method has been applied to predicting the residual life of high temperature piping.The results show that the approach to the prediction of residual life can reasonably meet the needs with both the creep limit failure criterion and the rupture life criterion.It is also shown that under the creep limit failure criterion, the creep internal stress method has the advantage of less test time in comparison with the isothermal extrapolation method based on conventional creep tests.