What is the minimum pressure for a sensitivity “bubble test” (Piping Leak Test)?

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For a formal liquid bubble leak test using a detector like Swagelok Snoop, the industry-standard minimum pressure governed by ASME Section V, Article 10 and ASME B31.3 is 15 psig or 25% of the system design pressure, whichever is less. While SNOOP itself will bubble at virtually any positive pressure where gas escapes, engineering codes specify pressure thresholds to ensure sufficient velocity and volume for micro-leaks to form visible indications within a practical inspection window.

ASME B31.3 (Process Piping — Sensitive Leak Test, Para. 345.8):

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