rating vs. maximum testing pressure
rating vs. maximum testing pressure
(OP)
which relation there's between valves and flanges rating (# 150, 300, 600, 900, 1500.......) and maximum testing pressure?
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rating vs. maximum testing pressure
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rating vs. maximum testing pressurerating vs. maximum testing pressure(OP)
which relation there's between valves and flanges rating (# 150, 300, 600, 900, 1500.......) and maximum testing pressure?
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RE: rating vs. maximum testing pressure
Can't say about valves, but it would not surprise me if the same basis was used.
Regards,
Mike
RE: rating vs. maximum testing pressure
I generally observed the normal practice (No Code reference recalled right now!)
Hydro test pressure=1.5 X operating pressure
However practically it is most usually considered as
Hydro test pressure=1.5 X rated pressure
(i.e. 150#,300#.. and so on)
Whereas Brand new fabrications are seen to be
Hydro tested=2X rated pressure*(i.e 150#, 300#... and so on)
*Conditional to the stress bearing capabilities.
Some Learned forum members will just correct/put the relevance intact soon.
Best Regards
Qalander(Chem)
RE: rating vs. maximum testing pressure
Perhaps temperature matters for some applications.
Many different codes and standards exist and may apply depending upon the type process etc. Is this for wastewater, a refinery, a power boiler, cross-country pipeline, domestic USA or some international application? This involves the selection of ASME B31.1, B31.2, B31.3, B31.4 or B31.8. What is the fluid? If chlorine or other toxic or incompatible fluid then hydrostatic testing may not be permitted. Boiler external piping
is hydrostatically tested in accordance with PG-99 of Section I of the ASME Boiler and Pressure Vessel Code. The test shall be conducted in the presence of the Authorized Inspector. The requirements may differ depending upon the wall thickness.
Let's assume that you are not interested in gray iron flanges. ASME B16.5 covers smaller flanges, B16.47 covers really large flanges. ASME B16.34 applies to valves. API STD 598 applies to valve testing when specified.
ISA 75.19.01 applies to control valve hydrostatic testing.
Subsea valves may require external hydrostatic tests.
B16.5 - Flanged joints and flanged fittings may be subjected
to system hydrostatic tests at a pressure of 1.5 times the
38°C (100°F) rating rounded off to the next higher 1 bar
(25 psi) increment. Testing at any higher pressure is
the responsibility of the user, taking into account the
requirements of the applicable code or regulation.
RE: rating vs. maximum testing pressure
(a) 7.1 Each valve shall be given a shell test at a gage pressure no less than 1.5* the 100 deg F rating rounded off to the nearest next higher 25 psi increment. Test times are also given based on diameter of the valve bore.