Hydrostatic Test Pressure is the holding pressure for a specific amount of time to visually inspect the stationary equipment or piping system for leaks. ASME Code B 31.3 provides the basis for test pressure. The minimum Hydrostatic Test Pressure for metallic piping shall be as per the following equation: Pt=1.5 * Pd * (St/Sd) where, Pt=minimum test gauge pressure, Pd=internal design gauge pressure, St=allowable stress value at test temperature, Sd=allowable stress value at design temperature. The Hydrostatic Testing Pressure is normally 30% higher than the design pressure whereas a pneumatic testing pressure is normally 10% higher than the design pressure.
Related Definitions in the Project: The Piping and Pipeline Engineering; Construction; Quality Management
