Test Pressures
The selected test method and fluid test medium, together with the applicable code, will also establish the rules to be followed in calculating the required test pressure. In most cases a pressure greater than the design pressure rating is applied for a short duration, say at least 10 minutes. The magnitude of this initial test pressure is often at least 1.5 times the design pressure rating for a hydrostatic test. However, it may be different, depending upon which code is applicable and whether the test is hydrostatic or pneumatic.
Furthermore, the test pressure must never exceed a pressure that would cause yielding, or the maximum allowable test pressure of some component exposed to the test. In the case of ASME B31, section 137.1.4, and the Boiler and Pressure Vessel Codes, the maximum test pressure must not exceed 90 percent of yield for any component exposed to the test. The test pressure is needed to demonstrate that the system can safely withstand the rated pressure. Following this period of greater than design pressure, it is often permissible to reduce the pressure to a lower value for examination of leaks. The examination pressure is maintained for the length of time necessary to conduct a thorough
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