GB steel pipe flange national standard system in our country


The flange of the steel pipe in our country system of national standard GB GB steel pipe flange national standard system in our country

1) nominal pressure: 0.25 Mpa to 42.0 Mpa

A, series 1: PN1.0 PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 series (master)

B, series 2: PN0.25 PN0.6, PN2.5, PN4.0

PN0.25, PN0.6, PN1.0 PN1.6, PN2.5, PN4.0 altogether six grades of flange size is belong to the European flange system represented by Germany flange, flange for the rest of the United States on behalf of the American flange system.

In GB standard, from belongs to the flange system nominal pressure level of the largest in Europe for 4 mpa, subordinate to American flange system nominal pressure level up to 42 mpa.

2) nominal size: 10 mm to 4000 mm

3) the structure of flange:

Integral flange

Unit of the flange

A, threaded flange

B, welding flange butt welding flange

With flat welding neck flange with socket welding neck flange plate flat welding flange

C, loose flange butt welding ring will loose tube flange flat welding neck flange loose tube plate butt welding ring ring loose tube flange plate turned loose flange plate

D, flange cover (blind flange)

4) the flange sealing surface: plane, convex and concave and convex surface, grooved surface, RTJ

Second, the instrument flange standard system in common use

1, DIN standards,

1) commonly used pressure rating: PN6 PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250

2) of the flange sealing surface: raised face DIN2526C tu face flange grooued acc. DIN2512N grooved surface

2, the ANSI standard

1) commonly used pressure rating: CL150 CL300, CL600, CL900, CL1500

2) the flange sealing surface: ANSI B 16.5 RF flanges surface of flange

3, JIS standards: not commonly used

1) commonly used pressure levels: 10 k, 20 k

Third, how to recommend to customers companion flange and pipe standard

1, user requirements to provide matching flange manufacture figure:

Example: a user to choose a vortex street flowmeter, its model is: 70 fs80 - E0A00A1B100 E: PN40 DIN2501, raised face DIN2526C

User requirements to provide matching flange manufacture figure

Solution: this involves three standard drawing, DIN2501 for flange, DN2526C as on the surface of the flange type,

Find DIN2635 convex, reason. DIN2635 is DIN2501 as mother flange standard standard of flange surface adopt DIN2526C companion flange, fax this map to the user.

2, the vortex street flowmeter selection, choose the ANSI standard, Sch80, should pay attention to the difference of Sch40, and match with the pipe standard, namely: the instrument selected Sch80, pipe also choose Sch80, lest the pipe diameter and form a prominent between meter diameter.

Piping size series: inch pipe, the metric system

Inch pipe: general international pipe series

Metric pipe: for decades, the domestic chemical industry and other industrial departments series widely used steel pipe outside diameter size

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 pipe flange series

Inch pipe

SHJ406-89 "standard of China petrochemical corporation project construction"

PN2.0, 5.0, 6.8, 10.0, 15.0, 10.0, 15.0 Mpa for the pipe flange series

Metric pipe

HG5003 58 JB75 ~ ~ 5028-86-59

PN0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0, 20.0 Mpa is approximate to Germany tube flange escrow flange series of 50 years of the Soviet union.