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High-pressure industrial process piping manifold with control valves and steel rack structure
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Piping Engineering & Stress•9 min read•2026-03-15

ASME B31.3 Process Piping vs. ASME B31.1 Power Piping: Practical Engineering & Code Comparison

A detailed engineering comparison of ASME B31.3 and ASME B31.1 governing scopes, allowable stress calculations, joint efficiency factors, and post-weld heat treatment protocols.

ASME B31.1 applies strictly to boiler external piping (BEP) and non-boiler external piping in power stations, adopting higher safety factors.
ASME B31.3 applies across petroleum refineries, chemical plants, and terminal facilities, featuring tighter allowable stress margins based on tensile and yield.
By Principal Piping EngineerRead Technical Article

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