The issue of selecting the pressure rating for flanges on container equipment
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There is a pressure vessel with a design pressure of 1.6 MPa, a temperature of 150 degrees, and the medium used is demineralized water. Is it appropriate to use flanges rated for 1.6 MPa when selecting components for this equipment?
It depends on the materials you choose; you need to refer to Tables 6 and 7 of NB/T47020-2012 to make a judgment...
Looking at the NBT 47020 standard, the maximum operating pressure allowed for different materials varies; Q345 is acceptable.
Thank you; it’s clear once I see it. I’m not familiar with these standards, so I need to put in the effort to learn them*
It should be determined based on the flange material, operating pressure, and operating temperature. That is, judgment is made based on Tables 6 and 7 of NB/T47020-2012
It’s not appropriate; even without referring to tables, one usually chooses a value that is one rank higher. If the design pressure is 1.6, then 2.5 or higher is generally chosen
Look at the answer on the first floor; isn’t what he said wrong?
Which standard or specification specifies such a requirement?
This post was last edited by fzujunru on 2015-9-29 at 12:06. The answer given in the first comment is completely correct. What I meant was that when selecting the flange pressure rating, it’s sufficient to choose a value that is higher than the design pressure; this way, there will be enough margin available
This post was last edited by fzujunru on 2015-9-29 at 12:06. There’s no fixed standard for this; what I mean is that when selecting the flange pressure rating, it’s sufficient to choose a value that is higher than the design pressure, so that there is enough margin available
The design equivalent pressure must not exceed the allowable stress of the flange