Abstract
Bellows are specially engineered components. Bellows find wide range of applications in FBR systems such as in bellow-sealed valves and in piping systems for flexibility. Typical operating temperatures in FBR systems are around 550 °C, where failure modes such as creep and creep-fatigue interaction are significant. Conventional design codes for design of bellows such as standards of EJMA do not extensively address the high temperature failure modes. In this present work, methodology adapted for design of bellows for high temperature application, operating at 550 °C has been presented. The preliminary design of the bellows for temperatures below the creep range was completed by standards of EJMA, so that the failure modes such as fatigue, in-plane and column instability of bellows can be addressed. Subsequently, the preliminary design was analyzed using FEA as per the guidelines given by RCC-MR to address the failure modes such as creep and creep-fatigue interaction. Elevated temperature testing of the bellows showed close agreement between the design of the bellows by the above mentioned method and the experimental results.
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