Abstract:  The design of expansion joint for fixed tubesheet heat exchanger under severe conditions of large temperature difference and high pressure is discussed. The material selection, stress and specific structure design of expansion joint under such harsh working conditions are analyzed in detail, and the design methods and steps of expansion joints under such harsh working conditions are summarized. Through the analysis of specific cases, the method of adjusting wave height, curvature radius, wave number and the thickness and material of expansion joint is used in the calculation. The results show that using high strength alloys such as nickel-based alloys as the material of expansion joint, the optimized structure is not only reasonable but also economical. It provides references for the design of bellow expansion joints under similar working conditions.

Key words:  , bellow expansion joint, fixed tubesheet heat exchanger, nickel-based alloy