Commonly used international pipe flange standard system

Flange connection or flange joint, refers to the flange, gasket and bolts connected to each other as a group of combined seal structure of the foldable connection, the pipe flange refers to the pipeline device with the flange, used in the equipment Refers to the import and export of equipment flange. 2, the international management of the flange system of several systems
1) European flange system: German DIN (including the Soviet Union)
Shanxi Shuanghuan Heavy Machinery Co., Ltd. is specialized in the production of carbon steel, alloy steel, stainless steel and other materials of large ring pieces, forgings, wind turbine base ring flange and tower connecting flange, and independent research and development of heavy forging machinery and equipment large enterprise.
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, the public diameter: 15 ~ 600mm
C, the structure of the flange type: flat welded plate, flat welding ring loose sets, curling loose sets of type, butt welding edge loose sets, butt welding ring loose sets, butt welding, with neck thread connection, Integral and flanged
D, flange sealing surface: flat, concave, convex surface, tongue and groove surface, rubber ring connection surface, lens surface and diaphragm welding surface
E, the Soviet Union in 1980 released OCT pipe flange with the German standard standard similar to the German standard, no longer recall
2)
3) Japan JIS pipe flange: in the petrochemical plant is generally only used for public works, the international impact of small, in the international community did not form 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
Which PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0 a total of six grades of flange size is based on the German flange as the representative of the European flange system, the rest of the United States law Blue as the representative of the American flange system.
In the GB standard, subordinate to the European flange system nominal pressure level of the largest 4Mpa, subordinate to the American flange system nominal pressure level of up to 42Mpa.
2) Nominal diameter: 10mm ~ 4000mm
3) Flange structure:
Integral flange
Unit flange
A, threaded flange
B, welding flange welding flange
Neck flat welding flange with neck socket welded flange plate flat welding flange
C, loose flange on the welding ring loose sets with neck flange on the ring ring loose plate plate flange ring welding ring loose plate plate flange plate through the loose flange
D, flange cover (blind hole flange)
4) flange sealing surface: plane, concave, convex surface, tongue and groove surface, ring connection surface
Second, the instrument commonly used tube flange standard system
1, DIN standard
1) Common pressure rating: PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250
2) Flange Seal: raised face DIN2526C Flange Flange grouteed acc. DIN2512N
2, ANSI standard
1) Common pressure levels: CL150, CL300, CL600, CL900, CL1500
2) Flange Seal: ANSI B 16.5 RF flanges
3, JIS standard: not commonly used
1) Common pressure rating: 10K, 20K
Third, how to recommend to the user matching stainless Steel Flange standards and pipe standards
1, the user asked to provide matching flange manufacturing map:
Example: a user selected a vortex flowmeter, the model is: 70FS80-E0A00A1B100 E: PN40 DIN2501, raised face DIN2526C
The user is required to provide a pairing flange manufacturing drawing
Solution: This involves three standard maps, DIN2501 for the mother flange, DN2526C for the flange surface type,
Convex, so find DIN2635. DIN2635 DIN2501 is the mother flange standard flange surface to DIN2526C matching flange standard, this picture can be faxed to the user.
2, in the vortex flowmeter selection, the choice of ANSI standard, the need to pay attention to Sch80, Sch40 differences, and with the piping standard match, namely: instrument selection Sch80, the pipeline also selected Sch80, so that the pipe diameter and instrument diameter Between the formation of a prominent.
Piping size series: British tube, metric tube
British tube: the international common pipe series
Metric tube: Outside the size of steel pipe used in domestic chemical industry and other industrial sectors for decades
Piping series
Tube flange standard
Pressure level
PN0.25,0.6,1.0,1.6,2.5,4.0 Mpa for the German pipe flange series
GB9112 ~ 9125-88
PN2.0,5.0,10.0,15.0,25.0,42.0 Mpa for the United States tube flange series
British tube
SHJ406-89 "China Petrochemical Corporation engineering construction standards"
PN2.0,5.0,6.8,10.0,15.0,25.0,42.0 Mpa for the United States tube flange series
Metric tube
HG5003 ~ 5028-58 JB75 ~ 86-59
PN0.25, 0.6,1.0,1.6,2.5,4.0,6.4,10.0,16.0,20.0 Mpa for the German tube flange of the Soviet Union 50 years tube flange series.