Dear Sir,
As per ASME 31.3 Para 345.4.2 (b)
for design temperature above the test temperature,the minimum test pressure shall be calculated by Eq.(24), except that the value of ST/S shall not exceed 6.5:
PT p =1.5 PST/S ..................(24)
where.......P = internal design gage pressure
PT = minimum test gage pressure
S = stress value at design temperature (see Table A-1)
ST = stress value at test temperature
What is this meaning. I have one system the design temp is 170 F. but the hydro test temp is less than this as normal. So how we calculate the test pressure.
Temp . 170 F Material - API 5L GrB, Design pressure 622 psig. Flange rating is 300# Please help me to get right testing pressure.
As per normal calculation I got 622* 1.5 = 933 psig.
Thanks and Regards
Vani
Hydrotest Pressure
