1. Several Systems of Commonly Used International Pipe Flange Standards and China's Pipe Flange Standards
1. Flange connection or flange' refers to a folding connection that is connected by flanges, gaskets and bolts as a group of combined sealing structure' pipeline flange refers to the flange used for matching pipes in pipeline devices' used on equipment refers to the inlet and outlet flanges of equipment.
2. Several systems of international pipe flange standards
1) European flange system: German DIN (including the Soviet Union)
A nominal pressure: 0.1, 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0, 25.0, 32.0, 40.0, Mpa B, common diameter:
15 ~ 600mm C, flange structure type: flat welding plate type, flat welding ring loose sleeve type, curling loose sleeve type, butt welding curling loose sleeve type, butt welding ring loose sleeve type, butt welding type, neck thread connection type, integral type and flange cover
D flange sealing surfaces include: plane, concave surface, concave-convex surface, rod groove surface, rubber ring connecting surface, lens surface and diaphragm welding surface. the OCT pipe flange co-recording standard issued by the Soviet Union in 1980 is similar to the German DIN standard
2) American flange system: American ANSI B16.5 {steel pipe flange and flange fittings> 〉
A. nominal pressure: 150psi (2.0MPa) '300psi (5.0MPa)' 400psi (6.8MPa) '600psi (10.0MPa)' 900psi(15.0MPa) '1500psi(25.0MPa)' 2500psi(42.0MPa) 'B, common diameter: 6 ~ 4000mm C, flange structure type: strip welding, socket welding, threaded connection, loose sleeve, butt welding and flange cover d, flange sealing surface: concave surface, concave-convex surface, rod groove surface, metal ring connection surface
3) Japan JIS pipe flange: in the petrochemical plant is generally only used for public works 'in the international shadow' in the international community has not formed an independent system.
3, China's steel pipe flange national standard system GB.
1) Nominal pressure: 0.25Mpa ~ 42.0Mpa
a, series 1:PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series) B, series 2:PN0.25, PN0.6, PN2.5, PN4.0
Among them, PN0.25 'PN0.6'PN1.0'PN1.6'PN2.5'PN4.0 flange sizes of 6 grades belong to European flange body represented by German flange
The rest is the American flange system represented by the American flange. In the GB standard, the maximum nominal pressure level belonging to the European flange system is 4Mpa', the maximum nominal pressure level belonging to the American flange system is 42Mpa.
2) Nominal diameter: 10mm ~ 4000mm
3) Flange structure: integral flange
Unit flange a, threaded flange
B. Welding flange
Butt welding flange with neck flat
Welding flange with neck socket welding flange plate type
Flat welding flange
C, loose sleeve flange welded ring loose sleeve with neck flange welded ring loose sleeve plate flange flat welding ring loose sleeve plate flange plate type turned loose sleeve flange
d. Flange cover (blind flange)
) Flange sealing surface: flat surface, concave surface, concave-convex surface, rod groove surface and ring connection surface
1. Flange connection or flange' refers to a folding connection that is connected by flanges, gaskets and bolts as a group of combined sealing structure' pipeline flange refers to the flange used for matching pipes in pipeline devices' used on equipment refers to the inlet and outlet flanges of equipment.
2. Several systems of international pipe flange standards
1) European flange system: German DIN (including the Soviet Union)
A nominal pressure: 0.1, 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0, 25.0, 32.0, 40.0, Mpa B, common diameter:
15 ~ 600mm C, flange structure type: flat welding plate type, flat welding ring loose sleeve type, curling loose sleeve type, butt welding curling loose sleeve type, butt welding ring loose sleeve type, butt welding type, neck thread connection type, integral type and flange cover
D flange sealing surfaces include: plane, concave surface, concave-convex surface, rod groove surface, rubber ring connecting surface, lens surface and diaphragm welding surface. the OCT pipe flange co-recording standard issued by the Soviet Union in 1980 is similar to the German DIN standard
2) American flange system: American ANSI B16.5 {steel pipe flange and flange fittings> 〉
A. nominal pressure: 150psi (2.0MPa) '300psi (5.0MPa)' 400psi (6.8MPa) '600psi (10.0MPa)' 900psi(15.0MPa) '1500psi(25.0MPa)' 2500psi(42.0MPa) 'B, common diameter: 6 ~ 4000mm C, flange structure type: strip welding, socket welding, threaded connection, loose sleeve, butt welding and flange cover d, flange sealing surface: concave surface, concave-convex surface, rod groove surface, metal ring connection surface
3) Japan JIS pipe flange: in the petrochemical plant is generally only used for public works 'in the international shadow' in the international community has not formed an independent system.
3, China's steel pipe flange national standard system GB.
1) Nominal pressure: 0.25Mpa ~ 42.0Mpa
a, series 1:PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series) B, series 2:PN0.25, PN0.6, PN2.5, PN4.0
Among them, PN0.25 'PN0.6'PN1.0'PN1.6'PN2.5'PN4.0 flange sizes of 6 grades belong to European flange body represented by German flange
The rest is the American flange system represented by the American flange. In the GB standard, the maximum nominal pressure level belonging to the European flange system is 4Mpa', the maximum nominal pressure level belonging to the American flange system is 42Mpa.
2) Nominal diameter: 10mm ~ 4000mm
3) Flange structure: integral flange
Unit flange a, threaded flange
B. Welding flange
Butt welding flange with neck flat
Welding flange with neck socket welding flange plate type
Flat welding flange
C, loose sleeve flange welded ring loose sleeve with neck flange welded ring loose sleeve plate flange flat welding ring loose sleeve plate flange plate type turned loose sleeve flange
d. Flange cover (blind flange)
) Flange sealing surface: flat surface, concave surface, concave-convex surface, rod groove surface and ring connection surface