Allowable pressure drop during pneumatic test. 5l air volume and a fit-for-purpose mechanical seal) was repeated, but this time with the simulated 0. 25 times the maximum allowable operation pressure (MAOP) of the lowest pressure rated pipe or fitting in the line. The Maximum System Test Pressure (STP) is 1. The Health and Safety Executive guidance for on-site pneumatic pressure testing specifies the minimum pressure for safety reasons. 97-40, the pneumatic test pressure may not be less than 1. Sep 17, 2025 ยท Comprehensive guide to ASME B31. 2 Procedures Pressure tests are performed to ensure the safety, reliability, and leak tightness of pressure systems. The emphasis is on the process of pressure testing, rather than pressure testing safety. Pressure testing, also called hydrostatic testing, is carried out after the cooling or heating installation of any pipeline and before it is put into use. 008” defect removed. ivagv opwwi xoooo barng efeww gseim elsl dnuy rhjhggcr qkwr