For ASME VIII-I vessels, Hydraulic test pressure is HYDRAULIC TESTING MAWP For ASME VIII-I vessels, Hydraulic test pressure is minimum of 1.3 x vessel MAWP UG-98

TEMPERATURE CORRECTION TEST PRESSURE TEMPERATURE CORRECTION Allowable stress at test temp Allowable stress at design temperature Test P=1.3 x MAWP x Test pressure correction is needed because the material is stronger at (ambient ) test temperature than it elevated design temperature

HYDROTEST VISUAL EXAMINATION FOR SAFETY REASONS The ASME principle is to reduce the pressure to Test Pressure/1.3 before approaching the vessel under test.

HYDROSTATIC TEST ON STORAGE TANKS Tank is just filled with water under static head Test lasts 24 HRS