Session: DA-01-02 Design & Analysis of Heat Exchangers & Components II

Paper Number: 62020

Start Time: Wednesday, July 14, 2021, 05:00 PM

62020 - Applicability of Design Rules for Openings in Shells, ASME B&PV Code, Section VIII, Division 2 - A Case Study 

The pressure-area method is recently introduced in the ASME B&PV Code, Section VIII, Division 2 to reduce the excessive conservatism of the traditional area-replacement method. The pressure-area method is based on ensuring that the resistive internal force provided by the material is greater than or equal to the reactive load from the applied internal pressure. A comparative study is undertaken to study the applicability of design rules for certain nozzles in shells using finite element analysis (FEA). From the results of linear elastic FEA, it is found that in some cases the local stresses at the nozzle to shell junctions exceed the allowable stress limits even though the Code requirements of pressure-area method are met. It is also found that there is reduction in local stresses when the requirement of nozzle to shell thickness ratio is maintained as per EN 13445 Part 3. The study also suggests that the reinforcement of nozzles satisfy the requirements of elastic-plastic stress analysis procedures even though fails to satisfy the requirements of elastic stress analysis procedures. However, the reinforcement should be chosen judiciously to reduce the local stresses at the nozzle to shell junction and to satisfy other governing failure modes such as fatigue.

Presenting Author: Krishnakant V. Pudipeddi ENGINEERS INDIA LIMITED

Authors:

GURUMURTHY K ENGINEERS INDIA LIMITED
Krishnakant V. Pudipeddi ENGINEERS INDIA LIMITED
Subramanyam V. R. Sripada ENGINEERS INDIA LIMITED