Alternative Nozzle Reinforcement Rules for Gasketed Plate Heat Exchangers

Abstract

Abstract This paper aims to provide an alternative design approach to the current nozzle reinforcement rules for gasketed plate heat exchangers (GPHE) designed in accordance with Appendix 45 of ASME BPVC Section VIII, Div. 1. The current ASME BPVC Section VIII, Div. 1 nozzle reinforcement rules require the use of bending stress calculated at the center of the GPHE end plate where the bending stress has the highest value. Typical GPHE’s have inlet and outlet nozzles located near the top or bottom of the GPHE end plates where the bending stresses are lower as compared to the bending stresses at the center of the plates. For nozzle reinforcement analysis in GPHE end plates, this alternative design approach suggests utilizing the bending stress values calculated in vicinity of nozzles in lieu of bending stress value at center of the end plate. It also suggests utilizing the modified UG-39 rules for GPHE end plate nozzle reinforcement. In order to optimize the design thickness of the GPHE end plates, this paper will analyze the impact of nozzle size and location on bending stresses in the end plates, propose modification of UG-39 rules for GPHE end plates, and to define the limits of the design approach.