What are the differences in choosing between raised-face flanges and grooved-face flanges?
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For example, for materials of 300BL that have convex and textured surfaces, under what circumstances is it necessary to use flanges with textured surfaces? Are there explicit regulations requiring this? Please
Generally, raised and recessed face flanges are used when the pressure exceeds PN6.4.
Flanges with uneven surfaces are relatively expensive; generally, those suitable for toxic and harmful media at PN40 pressure are sufficient
I’m currently using 50-kilogram gas cylinders; I don’t want to use concave surfaces, I prefer convex surfaces. Is that possible? I mainly want to know which regulations specify this
It’s specified in the national standards; you can take a look at 20615
HG/T20583-P495, the bottommost column in the table – applicable to raised and recessed face flanges
For general pressure vessels, concave-convex face flanges with PN2.5 are used; concave-convex face flanges are applicable for pressures above PN2.5.
Classified by pressure, 300 pounds with a convex surface is sufficient.