This standard specifies the types and sizes of concave and convex steel pipe flange covers with nominal pressure PN of 1.6, 2.5, 4.0, 6.3, 10.0, 16.0 MPa and nominal pressure PN of 5.0, 11.0, 15.0, 26.0 MPa. This standard is applicable to concave and convex steel pipe flange covers with nominal pressure PN1.6 to PN26.0 MPa. GB/T 9123.2-2000 Concave and convex steel pipe flange covers GB/T9123.2-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Concave and convex steel pipe flanges
Steel pipe blank flanges
with male and female face
GB/T 9123.2-2000
Replaces GB/T 9123.17~9123.23-1988This standard specifies the types and dimensions of concave and convex steel pipe flanges with nominal pressure PN of 1.6, 2.5, 4.0, 6.3, 10.0, 16.0MPa and nominal pressure PN of 5. (), 11.0, 13.0, 26.0MPa. This standard is applicable to concave and convex steel pipe flanges with nominal pressure PN1.6~PN26.0MPa. 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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T9112-2000 Types and parameters of steel pipe flanges GB/T9124-2000 Technical conditions for steel pipe flanges 3 Types and sizes of flange covers
3.1 The types of PN1.6, PN2.5, PN4.0, PN6.3, PN10.0 and PN16.0MPa convex steel pipe flange covers shall comply with the provisions of Figure 1, and the dimensions shall comply with the provisions of Tables 1 to 6. 3.2 The types of PN5.0, PN11.0, PN15.0 and PN26.0MPa concave and convex steel pipe flange covers shall comply with the provisions of Figure 2, and the dimensions shall comply with the provisions of Tables 7 to 10.
4 Technical requirements for flange covers
4.1 The technical requirements for flange covers shall comply with the provisions of GB/T9124. 4.2 The maximum non-impact working pressure of flange cover at different temperatures shall comply with the provisions of Appendix A (Standard Appendix) of GB/T9124-2000.
5 Marking
5.1 The flange cover shall be marked according to the nominal diameter, nominal pressure, sealing surface type code and standard number. 5.2 The type code of the sealing surface of the flange cover shall comply with the provisions of GB/T9112. 5.3 Marking examples
Convex steel pipe flange cover with nominal diameter 80mm and nominal pressure 5.0MPa (50bar): flange cover DN80-PN50M GB/T 9123.2--2000 Concave steel pipe flange cover with nominal diameter 80mm and nominal pressure 2.5MPa (25bar): flange cover DN80-PN25F GB/T 9123.2--2000 Approved by the State Administration of Quality and Technical Supervision on September 28, 2000 and implemented on July 1, 2001
GB/T 9123. 2—-2000
Figure 1 Concave and convex surface (MF) steel pipe flange coverbzxz.net
(Applicable to PN1.6, PN2.5, PN4.0, PN6.3, PV10.0 and PN16.0MPa)Table 1 PN1.6MPa (16bar) concave and convex surface steel pipe flange cover connection dimensions
Bolt hole
Center circle
Use PN4.0MPa flange ruler
Sealing surface
GB/T 9123. 2—2000
Table 2PN2.5MPa (25bar) concave and convex steel pipe flange cover connection size
bolt hole
center circle
UsePN.I.OMPa flange size
sealing surface
PN4.0MPa (4Obar) back west steel pipe flange cover connection size
bolt hole
center circle
sealing surface
GB/T9123.2—2000
PN6.3MPa (63bar) concave and convex steel pipe flange cover Table 4
Connection size
Bolt hole
Center circle
Before sealing
PN10.0MPa (100bar) concave and convex steel pipe flange cover connection size
Bolt hole
Center circle
Sealing surface
GB/T 9123. 2—2000
PN16.0MPa(160bar)convex and concave steel pipe flange coverTable 6
Connection size
Bolt hole
Center circle
Figure 2 Concave and convex surface (FM) steel pipe flange cover
Sealing surface
(Applicable to PN5.0, PN11.0.PN15.0 and PN26.0MPa)4
GB/ T9123.2—2000
Table 7PN5.OMPa (50bar) Concave and convex steel pipe flange cover connection dimensions
Bolt hole
Center circle
Sealing surface
PN1.OMPa (11obar) Concave and convex steel pipe flange cover connection dimensions
Bolt hole
Center circle
Sealing gallery
GB/T 9123.2—2000
PN15.0MPa（150bar）convex and concave steel pipe flange cover Table 9
Connection size
Bolt hole
Center circle
Use PN26.0MPa flange size
Sealing surface
PN26.0MPa（260bar）convex and concave steel pipe flange cover connection size
Bolt hole
Center circle
Sealing surface
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