The procedure proposed applies to evaporator section of bottom-supported heat-recovery steam generators (HSRG): It includes classical methods for the static analysis of the lower header based on ASME Power Piping code B31.1  and a computer-modeled flexibility analysis with a preliminary stress evaluation using both Italian and ASME pressure formulae. The stability of the harp high-temperature components may be critical because of their longitudinal dimensions, thermal expansions and loading. So, further elements of engineering choices may help obtaining good design of the header-tube assembly (harp).
ASME Piping Code-Based Stress Analysis Procedure and a Comparison With the Italian Code
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Grisolia, O. "ASME Piping Code-Based Stress Analysis Procedure and a Comparison With the Italian Code." Proceedings of the ASME 2012 Pressure Vessels and Piping Conference. Volume 1: Codes and Standards. Toronto, Ontario, Canada. July 15–19, 2012. pp. 791-798. ASME. https://doi.org/10.1115/PVP2012-78692
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