A new method of strength calculation and lifetime prediction of pipe bends operating in the creep range |
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| Affiliation: | 1. School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Key Laboratory of Modern Measurement & Control Technology, Ministry of Education, Beijing Information Science and Technology University, Beijing 100192, China;1. Centro Sviluppo Materiali S.p.A. (CSM), via di Castel Romano 100, 00128 Rome, Italy;2. Faculty of Science and Technology, Free University of Bozen, piazza Università, 5, 39100 Bolzano, Italy;3. D’Appolonia S.p.A., via Cesare Pavese, 305, 00144 Rome, Italy |
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| Abstract: | An easy to use method for an approximate creep life prediction for pipe bends was developed within a recent R & D-project in Germany. The new algorithm is based on a Finite-Element parameter study comprising approximately 200 pipe bends. The creep behaviour of the materials primarily used for main steam and hot reheat piping is described using the Graham–Walles creep law. Since the new algorithm considers the time dependent out-of-roundness and stress redistribution of the pipe bend, it yields a more precise creep life prediction, compared to standard piping codes. It is possible to integrate this new calculation into existing online lifetime-monitoring-systems. |
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