This standard specifies the types and sizes of flat and raised face steel pipe flange covers with nominal pressure PN of 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0 MPa and nominal pressure PN of 2.0, 5.0, 11.0, 15.0, 26.0, 42.0 MPa. This standard is applicable to flat and raised face steel pipe flange covers with nominal pressure PN0.25 to PN42.0 MPa. GB/T 9123.1-2000 Flat and raised face steel pipe flange covers GB/T9123.1-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Steel pipe blank flanges
with flat face or raised faceGB/T 9123.12000
Replaces GB/T 9123.1~9123.16 1985This standard specifies the types and sizes of steel pipe blank flanges with flat face or raised face with nominal pressure PN of 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0MPa and nominal force PN of 2.0, 5.0, 11.0, 15.0, 26.0, 42.0MPa. This standard applies to steel pipe blank flanges with flat face or raised face with nominal pressure PN0.25~PV42.0MPa. 2 Reference 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
3.1PNO.25, PNO.6, PN1.0, PN1.6, PN2.5 and PN4.0MPa The type of flat steel pipe 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 type of PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.3, PN10.0 and PN16.0MPa raised face steel pipe flange cover shall comply with the provisions of Figure 2, and the dimensions shall comply with the provisions of Tables 1 to 9. 3.3 The type of PN2.0MPa flat face steel pipe flange cover shall comply with the provisions of Figure 3, and the dimensions shall comply with the provisions of Table 10. 3.4 The type of PN2.0 and PN5.0MPa raised face steel pipe flange cover shall comply with the provisions of Figure 4, and the dimensions shall comply with the provisions of Tables 10 and 11.
3.5 The type of PN11.0, PN15.0, PN26.0 and PN42.0MPa raised face steel pipe flange cover shall comply with the provisions of Figure 5. The dimensions shall comply with the provisions of Tables 12 to 15.
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-extrusion working pressure of flange covers at different temperatures shall comply with the provisions of Appendix A (Standard Appendix) of GB/T9124-2000.
5 Marking
5.1 Flange covers shall be marked according to nominal diameter, nominal pressure, sealing surface type code and standard number. 5.2 The type code of the flange cover sealing surface shall comply with the provisions of GB/T9112. 5.3 Marking example
Flat steel pipe flange cover with nominal diameter of 80mm and nominal pressure of 2.5MPa (25bar): Approved by the State Administration of Quality and Technical Supervision on September 28, 2000 216
2001-0701 implementation
GB/T 9123.1—2000
Flange cover DN80-PN25FF GB/T9123.1—2000 Raised face steel pipe flange cover with nominal diameter of 80mm and nominal pressure of 5.0MPa (50har): Flange cover DN80-PN50RF GB/T9123.1-2000 Figure 1 Flat (FF) steel pipe flange cover
(Applicable to PN0.25.PN0.6, PN1.0, PN1.6, PN2.5 and PN4. 0MPa) Figure 2 Raised face (RF) steel pipe flange cover
(Applicable to PN0.25, PN0.6, PN1. 0, PN1. 6, PN2.5, PN4.0, PN6.3, PN10. 0 and PN16.0MPa)17
GB/T9123.1-2000
Table 1PNO.25MPa (2.5bar) flat and raised face steel pipe flange cover connection dimensions
Bolt hole
Center circle
UsePNO.6MPa flange dimensions
Sealing surface
GB/T9123.1—2000
Table 2PNO.6MPa (6bar) flat and raised face Steel pipe flange cover connection dimensions
Bolt hole
Center circle
Sealing surface
GB/T9123.1—
Table 3PN1.OMPa (10bar) Flat and raised face steel pipe flange cover connection dimensions
Bolt hole
Center circle
Use PN4.OMPa Flange size
Use PN1.6MPa Flange size
Sealing surface
GB/T 9123. 1—2000
Table 4PN1.6MPa (16har) plane, raised face steel pipe flange cover connection dimensions
bolt hole
center circle
use PN1.0MPa flange ruler small
sealing surface
GB/T9123.1—-2000
Table 5PN2.5MPa (25bar) plane, raised face steel pipe flange cover connection dimensions
bolt hole
center circle
use PN4.0MPa flange ruler hand
sealing surface
Table 6PN4.0 MPa (40bar) Flat and raised face steel pipe flange cover connection size
Bolt hole
Center circle
Sealing surface
GB/T9123.1---2000
Table 7 PN6.3MPa (63bar) Raised face steel pipe flange cover connection size
Bolt hole
Center circle
Sealing surface
Table 8 PN10.OMPa (100bar) Raised face steel pipe flange cover connection size
Bolt hole
Center circle
Sealing surface
GB/T 9123. 1—2000
Table 9 PN16.0MPa (160bar) raised face steel pipe flange cover connection dimensions
Bolt hole
Center circle
Figure 3 Flat face (FF) steel pipe flange cover
(Applicable to PN2.0MPa)
Dense face
GB/T9123.1—2000
Figure 4 Raised face (RF) steel pipe flange cover
(Applicable to PN2.0 and PN5.0MPa)
Figure 5 Raised face (RF) steel pipe flange cover bzxz.net
(Applicable to PN11.0, PN15.0, PN26.0 and PN42.0MPa)265
GB/T9123.1
Table 10PN2.0MPa (20bar) Flat and raised face steel pipe flange cover connection size Small
Bolt hole
Center circle
Bolt hole
Center circle
Sealing surface
PN5.oMPa (50bar) Raised face steel pipe flange cover connection size
Sealing surface
GB/T 9123. 1---2000
Table 12 PN11.0MPa (110bar) raised face steel pipe flange cover connection dimensions
bolt hole
center circle
seal and
PN15.0MPa (150bar) raised face steel pipe flange cover connection dimensions
bolt hole
center circle
PN26.0MPa flange dimensions
seal surface
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