By Farzad Tabatabaie, Senior Equipment Engineer. A) Categories of Failures in Pressure Vessels Material-Improper selection of material; defects in material. Design-Incorrect design data; inaccurate or incorrect design methods; inadequate shop testing. Fabrication-Poor quality control; improper or insufficient fabrication procedures including welding; heat treatment or forming methods. Service-Change of service condition by the user; inexperienced operations or maintenance personnel; upset conditions. Some types of service which require special attention both for selection of material, design details, and fabrication methods are as follows: · Lethal · Fatigue (cyclic) · Brittle (low temperature) · High temperature · ...
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