Absolute pressure problem
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This post was last edited by prt0683 on 2010-11-2 23:51. Design pressure: 1.63 MPa (a). Design temperature: 362 ℃ I would like to ask, when using calculation software, should the design pressure be set at 1.53 MPa, 1.63 MPa, or some other value? They say that (a) denotes absolute pressure; I don’t understand it, and I hope everyone can help explain it.
The pressure used in calculations is gauge pressure; according to GB150, unless otherwise specified, pressures refer to gauge pressure
Oh, then what counts as a special note? It’s written that way in the technical agreement – does it really qualify as a special note? I’ve only been working with it for a short time. I hope everyone can give me some advice.
Reply to 3# yu05210: From the design process, manufacturing process, inspection of the container, to its use by the user, the design pressure and operating pressure are always gauge pressures. The design pressure on the container drawings should be a gauge pressure value.
Those with a indicate gauge pressure, while those with g indicate absolute pressure.
Under normal circumstances, it refers to gauge pressure; special cases need to be specified. The question already indicates that a represents absolute pressure, but the software is unable to distinguish between the two, so the absolute pressure has to be converted into gauge pressure for calculation.
When calculating the strength of pressure vessels, gauge pressure is used; sometimes gauge pressure is employed when preparing safety valve calculations for processes, but it has nothing to do with us
The calculation is performed using gauge pressure, so it needs to be converted to gauge pressure
What was said on the 5th floor is correct; the formula is gauge pressure = absolute pressure – atmospheric pressure