Large-diameter flange
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May I ask, for a flange with a design pressure of 7 MPa, a temperature of 250 degrees, and DN1800 dimensions, what standards should be followed for its design, manufacturing, and inspection?
I’ll provide a rather crude method; first, it should be noted that this design is definitely a non-standard one. In accordance with standard JB/T4703, a necked butt-welded flange with a pressure rating of 6.4 MPa and a diameter of DN800 is selected; for all the standard dimensions of this flange (except for the thicknesses at the large and small ends), an increase of 1000 is applied, and the sizes and quantity of bolts as well as the H value are adjusted in order to achieve the minimum possible flange thickness. Manufacturing and inspection can still follow JB/T4700. :handshake Last edited by c_m_1979 on 2008-1-9 11:43 ]
I’d like to join in the discussion as well. For a design pressure of 0.8 MPa and a temperature of 50 degrees, how should a DN3600 flange be designed, manufactured, and inspected? I hope to exchange ideas with experienced colleagues! This post was last edited by 2007hcbbs on 2008-1-9 15:20]
Flanges of such a large diameter are only seen in the regenerators and settlers of catalytic units, but not under such high pressures!
It’s also necessary to consider what medium it is used in; if it’s only in the liquid phase and not in the gas phase, then it’s simpler, as the standards are different.