Testing 25 bars pressure at 250C?
Testing 25 bars pressure at 250C?
(OP)
Howdy all,
I trying to proof test a prototype pipe flange cap that will be mounted to a 300 series 3" vessel that is designed to a limit of 25 bar and 250c.
The pressure is a no-brainer, but I wonder if there is a way to safely test the temp concurrently. I am in communication with my local (so cal) hydrotest providers but none I have contacted really have this experience.
The vessel is designed to contain oil.
Anybody have experience with this?
Thanks in advance,
Cameron
I trying to proof test a prototype pipe flange cap that will be mounted to a 300 series 3" vessel that is designed to a limit of 25 bar and 250c.
The pressure is a no-brainer, but I wonder if there is a way to safely test the temp concurrently. I am in communication with my local (so cal) hydrotest providers but none I have contacted really have this experience.
The vessel is designed to contain oil.
Anybody have experience with this?
Thanks in advance,
Cameron





RE: Testing 25 bars pressure at 250C?
The good news is you are testing for oil as the contained fluid (not water - with its high expansion as the water tries to become steam at that pressure-temperature - made even more dangerous as it flashes to saturated steam if a leak/fracture were to develop during the test.
the bad news, however, is that oil (any hydrocarbon) will be dangerously flammable/explosive after leaking at that high a pressure-temperature into the atmosphere.
I do not recall the chapter and verse of the requirement, but I believe you test to the pressure required for the 1.3 x MAWP requirement corrected for the room temperature of the test - testing with a non-flamable liquid that is safe for the process. (That the test fluid will not contaminate the tank and piping if the test fluid cannot be cleaned completely after the test.)
Note that a typical metal loses strength as it heats towards 250 deg C, so the 1.3 MAWP test pressure at room temperature is further from the failure point of the metal 25 deg C than it is at 250 C.
RE: Testing 25 bars pressure at 250C?
RE: Testing 25 bars pressure at 250C?
RE: Testing 25 bars pressure at 250C?
Regards
r6155
RE: Testing 25 bars pressure at 250C?
RE: Testing 25 bars pressure at 250C?
they have very high flash points (over 500F) and handle well.
Just by some pure 8cSt PAO (unblended with no additives).
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P.E. Metallurgy, Plymouth Tube