Common standards for flanges in the chemical industry application standard system
HG20592~20605 Steel pipe flange (European system)
HG20615~20626 Steel Pipe Flange (American System)
HG20606~20612 Gas Pipe Flange Gasket (European System)
HG20627~20633 Gas Pipe Flange Gasket (American System)
HG20613 Steel Pipe Flange Fasteners (European System)
HG20634 Steel Tube Stainless Steel Flange Fastener (American System)
HG/T21631 steel seamed butt welded pipe fittings
HG/T21632 forged steel socket weld, threaded and butt welded pipe
HG/T21637 chemical pipeline filter
HG20537.1 Austenitic stainless steel welded steel pipe selection regulations
HG20553 Seamless and welded steel pipe size selection for chemical piping
HG/T21634 forged steel pipe fittings
HG/T21635 carbon steel, low alloy steel seam welded butt welded pipe fittings
HG/T21577 Quick Special Connector
Flange standard includes both European and American flanges
American flange standard HG20615-HG20626
Nominal pressure: PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0 6 pressure levels
Nominal diameter: DN15~1500
Flange type: 6 types with neck flat welding, neck butt welding, integral flange, socket welding, thread, loose sleeve, etc.
Sealing surface type: 5 types of protruding surface, concave surface, groove surface, ring connection surface, and full surface.
The chemical industry pressure pipe application standard system is also a relatively complete standard system, and has undergone several years of production practice testing, with mature experience. Because it has two series of "large outer diameter series" and "small outer diameter series", "European flange" and "American flange", it is widely used, it can be used with foreign ANSI, DIN, ISO and other standards can be used together with domestic GB, SH, JB and other standards.
European flange: (HG20592 ~ HG20605)
Pressure rating: PN 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 25.0, etc. 10 levels
Nominal diameter: DN10~DN2000mm
Flange type: plate type flat welding, neck flat welding, neck butt welding, integral type, socket welding, thread, butt welding ring loose sleeve, flat welding ring loose sleeve, flange cover, lining flange, etc.
Sealing surface type: five types: protruding surface, concave surface, groove surface, ring connection surface, and full surface