This standard specifies the types and dimensions of tongue and groove 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 applies to tongue and groove steel pipe flange covers with nominal pressure PN1.6 to PN26.0 MPa. GB/T 9123.3-2000 Tongue and groove steel pipe flange covers GB/T9123.3-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Steel pipe blank flanges
with tongue and groove face
GB/T9123.3-2000
Replaces GB/T 9123. 21~-9123.30--1988This standard specifies the types and dimensions of steel pipe blank flanges with nominal pressure PN of 1.6, 2.5, 4.0, 6.3, 10.0, 16.0MPa and nominal pressure PN of 5.0, 11.0, 15.0, 26.0MPa. This standard is applicable to steel pipe blank flanges with nominal pressure PNl.6～PV26.0MPa. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown in this standard are valid at the time of publication. All standards will be revised. All parties using this standard should discuss the use of the latest versions of the following standards. GB/T9112-2000 Types and parameters of steel pipe flanges GB/T9124-2000 Technical conditions for steel pipes 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 grooved steel pipe flange covers shall comply with the provisions of Figure ! , 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 grooved 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 push 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
Face steel pipe flange cover with nominal diameter 80mm and nominal pressure 5.0MPa (50bar): flange cover DN80-PN50T GB/T 9123.3-2000Flange steel pipe flange cover with nominal diameter 80mm and nominal pressure 2.5MPa (25bar): flange cover DN80-PN25G GB/T9123.32000Approved by the State Administration of Quality Supervision, Inspection and Quarantine on September 28, 2000266
20010701Implementation
GB/T 9123.3-2000
Figure 1Flange cover for grooved surface (TG) steel pipe
(Applicable to PN1.6, PN2.5, PN4.0, PN6.3, PN10.0 and PN16. 0MPa) Table 1 PN1.6MPa (16bar) grooved steel pipe flange cover connection size
bolt hole
center circle
number of holes
sealing surface
use PN4.0MPa flange size
GB/T9123.3--2000
PN2.5MPa (25bar) grooved steel pipe flange cover connection size
bolt hole
center circle
connection size
bolt hole
center circle
sealing surface
use PNA.0MPa flange size
PN4.0MPa (40bar) grooved steel pipe flange cover sealing inquiry
GB/T 9123. 3-2000
PN6.3MPa（63bar）grooved steel pipe flange cover connection dimensions
bolt hole
center circle
connection dimensions
bolt hole
center circle
sealing surface
PN10.0MPa(100bar)grooved steel pipe flange cover sealing surface
GB/T9123.3—2000
Table 6PN16.0MPa(160bar）sample grooved steel pipe flange cover connection dimensions
bolt hole
center circle
sealing surface
Figure 2 Grooved (TG) steel Pipe flange cover
(Applicable to PN5.0, PN11.0, PN15.0 and PN26.0MPa)W
Connection size
Bolt hole
Center circle
GB/T9123.3--2000
PN5.OMPa(50bar)Grooved steel pipe flange cover sealing surface
Connection size
Bolt hole
Center circle
PN11.0MPa(110bar)Grooved steel pipe flange cover sealing surfacewwW.bzxz.Net
Connection size
Bolt hole
Center circle
GB/T 9123. 3—2000
PN15.0MPa (150bar) grooved steel pipe flange cover sealing surface
Use PN26.0MPa flange size
PN26.0MPa (260bar) grooved steel pipe flange cover connection size
Bolt hole
Center circle
Sealing surface
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