Enhancing the Reliability of Chemical Evaporators: A Method for Reinforcing the Fitting Hole

Evaporative heat exchangers often fail near the fitting hole, where heat and pressure concentrate. We evaluate a simple external-ring reinforcement that redistributes local stresses while preserving heat-transfer duty. Positioned among established reinforcement options, the approach is compared conceptually with collars and sleeves in terms of installation time, material use, and inspectability. Laboratory tests and finite-element analysis (FEA) were used together to map stress and deformation fields before and after reinforcement, and checks against ASME PTB-3-2013 design guidance confirm adequate safety margins. By redistributing load and eliminating crevice-forming gaps near the fitting, the ring removes the microconditions that foster fatigue and corrosion. Thermal performance was characterized to ensure the reinforcement does not compromise heat transfer. Overall, the work provides a quantitative, evaporator-specific validation of an external-ring reinforcement and a practical framework for selecting among reinforcement options under demanding operating conditions.