The titles and abstracts of several FEA related papers are listed below. Click on the underlined title to go to the full paper.

Investigation and Repair of Heat Exchanger Flange Leak

Dennis Martens - The Pritchard Corporation

Michael A. Porter - Dynamic Analysis

[Originally published in ASME PVP-Vol. 278, Developments in Pressure Vessels and Piping, 1994, pp. 133-143]

Abstract

During original operations a leak developed in the bolted tube sheet joints of a stacked pair of type 321 stainless steel TEMA type BEU exchangers in 8.27x106 N/m2 (1200psi) 371 oC (700 F) Hydrogen and Oil service (see Figure 1). After unsuccessful attempts to repair the leak an evaluation of the flanged joint design was undertaken. Finite Element analysis of the tube sheet joint provided the basis for understanding the complex temperature profile, displacements and stresses in the joint. The exchanger was successfully repaired using a weld ring gasket closure with the addition of disc spring washers to the bolting (see Figure 2). Observation of the flanged joint during startup and operation confirmed the Finite Element Analysis results.


A Comparison of the Stress results from Several Commercial Finite Element Codes with ASME Section VIII, Division 2 Requirements

Michael A. Porter - Dynamic Analysis

Dennis Martens - Black & Veatch Pritchard

[Originally published in ASME PVP-Vol. 336, Structural Integrity, NDE, Risk and Material Performance for Petroleum, Process and Power, 1995, pp. 341-346]

Abstract

The interpretation of 3-D stresses computed using Finite Element (FE) techniques has been the focus of an ongoing PVRC study "3D Stress Criteria: Guidelines for Application" (Hechmer and Hollinger, 1995). This paper proposes an FE stress evaluation procedure for plate element models in the spirit of that recommended in the PVRC guideline. A sample model is analyzed, using five commercially available FE codes. The results are compared to illustrate the variability in the FE codes. Additionally, the practical difficulties in implementing the PVRC recommended procedure in the various FE codes is discussed.