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Environmental, Health & Safety :: Plant & Personnel Safety :: Overpressure & Runaways

July 1, 2012

Overpressure Protection: Consider Low Temperature Effects in Design

Understanding the inherent limitations of current overpressure-protection analyses is key to developing a more robust heuristic

Aubry Shackelford, Inglenook Engineering; Brian Pack, BP North America

In designing and sizing relief-device and effluent-handling systems, one commonly overlooked aspect of the performance is examining the potential for low temperatures that can cause the components of the system to reach temperatures below their respective, minimum-design metal temperatures (MDMT), which may result in brittle fracture with subsequent loss of containment. This article points out limitations of the typical overpressure-protection-analysis philosophy, discusses common sources of low temperatures for further investigation, and addresses possible design remedies for MDMT concerns....

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