Calculate ASME B31.1 power piping hydrotest pressure and pneumatic leak test pressure for steel pipe and plastic piping.
The test pressure should be ≥ 1.5 times the design pressure for hydrotest, and ≥ 1.2 times the design pressure for pneumatic tests. The hoop stress during testing should be ≤ 90% of the yield stress. Hoop stress can be calculated for either the minimum wall thickness (nominal wall thickness minus fabrication allowance), or the pressure design wall thickness (minimum wall thickness minus the corrosion allowance).
For piping systems with combined internal and external pressure the test pressure should be calculated from the internal pressure. The hoop stress is calculated from the pressure difference during testing. Use the workbook ASME B31.1 data tables to look up allowable stress data.
Reference : ANSI/ASME B31.1 : Power Piping (2014)
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