This standard specifies the structural type and series size of Type A flat welding flanges for steel pressure vessels. This standard is applicable to Type A flat welding flanges for steel pressure vessels with nominal pressures of 0.25MPa to 6.40MPa and operating temperatures above -20℃ to 450℃. JB/T 4701-2000 Type A flat welding flange JB/T4701-2000 Standard download decompression password: www.bzxz.net

1 Scope
Industry Standard of the People's Republic of China
A-type socket-weld flange
This standard specifies the structural type and series size of A-type socket-weld flange for steel pressure vessels. JB/T4701-2000
Replaces JB4701-1992
This standard applies to A-type socket-weld flanges for steel pressure vessels with a nominal pressure of 0.25~1.6MPa and a working temperature higher than -20~300℃. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. JB/T4700—2000 Classification and technical conditions of pressure vessel flanges JB/T4704-2000 Non-metallic soft gaskets
JB/T4707—2000 Equal length studs
3 Structural types and dimensions
The structural types and series dimensions of type A flat welding flanges with various sealing surfaces shall comply with the requirements of Figures 1 to 4 and Table 1. The quality of flanges and village rings is listed in Table 2.
State Bureau of Machinery Industry
State Bureau of Petroleum and Chemical Industrybzxz.net
Figure 1 Flat sealing surface
Approved on 2000-04-24
Other changes
Implemented on 2000-09-30
JB/T4701—2000
Figure 2 Concave and convex sealing surface
JB/T4701—2000
Figure 3 Flat sealing surface of liner ring
JB/T4701—2000
Figure 4 Concave and convex sealing surface of liner ring
Nominal diameter
JB/T4701—2000
Flange, mm
PN= 0.25 MPa
PN= 0.60 MPa
PN= 1.0 MPa
Nominal diameter
Nominal diameter
DN, mm
JB/T4701—2000
Table 1 (end)
Flange, mm
PN = 1.6 MPa
Flange mass, kg
PN=0.25MPa
PN = 0.6 MPa
Bushing ring mass, kg
Nominal diameter
JB/T4701—2000
Table 2 (end)
Flange mass, kg
PN=1.0 MPa
PN=1.6MPa
Note: The mass of the flange body in the bushing ring flange can be approximately the mass of the flat flange. Flat
Mass of bushing, kg
Selection regulations
JB/T4701—2000
4.1 The materials, maximum allowable working pressure, technical conditions and markings of flanges and matching gaskets, studs and nuts shall comply with the provisions of JB/T4700.
4.2 Non-metallic soft gaskets for flanges shall comply with the provisions of JB/T4704. Equal-length studs for flanges shall comply with the provisions of JB/T4707. 4.3
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