Strength Analysis of a Plate Heat Exchanger with Two Design-By-Analysis Methods

2021 
Plate heat exchangers are widely used equipment in engineering. As the structure of the equipment is complicated, it is hard to perform accurate design with the traditional method or so-called design-by-rules. In this paper, two design-by-analysis methods, namely Elastic Stress Analysis Method and Limit-load Analysis Method were used to perform stress assessment of a plate heat exchanger. Results show that the plate heat exchanger meets the strength requirements according to ASME VIII-2. It is also found that if applying Elastic Stress Analysis Method, a lot of SCLs should be specified on components of the plate heat exchanger and stresses have to be categorized according to their effects on the strength failure of the equipment. If applying Limit-load Analysis Method, the materials are assumed to be ideal elastic-plastic, and no Stress Classification Lines (SCLs) and stress categorization are needed. Strength assessment is simply to find convergent solutions for the maximum loading. So if the equipment is complicate in structure like the plate heat exchanger, it is suggested to apply Limit-load Analysis Method to perform strength assessment.
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