Questions regarding the procurement of flanges
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I would like to ask everyone: when purchasing flanges, is it sufficient to specify only the model DN50 150LB RF HG20615? How should they be matched with steel pipes of different wall thicknesses, and should the inner diameter of the flange be specified as well?
If possible, it’s better to include that information; otherwise, how will others know where you use it and what it’s paired with?
The end face type isn’t specified; it’s WN or NPT. . . If it is a butt-welded connection, the wall thickness grade such as SCH40 must also be specified; additionally, the material type is not indicated either
When purchasing I-flanges, it is necessary to specify: the type of flange, such as SO, WN, SW, TH, BL, etc.; the flange sealing surface, such as RF, M, FM, T, J, RJ, etc.; the flange material, such as 304, 316L, A105, 20#, Q345B, etc.; and the standards, such as ASME B16.5, HG/T20615-2009, SH/T3406-2013, etc. For American-standard flanges, in addition to SO, TH, BL, it is also necessary to specify the exact wall thickness of the piping, for example: Flange WN 600LB 24” RF SCH40 316L ASME B16.5
It was explained very clearly upstairs. PS: You can take a perspective shift approach to this – if you were a flange manufacturer, seeing these data would allow you to determine the specifications of the flanges
The people upstairs have explained it in great detail. Regarding the wall thickness for takeover, if it isn’t specified, it is generally assumed to be Sch.40.