This standard specifies the types and dimensions of steel pipe flange covers with annular joints with nominal pressures PN 02.0, 5.0, 11.0, 15.0, 26.0, and 42.0 MPa. This standard applies to steel pipe flange covers with annular joints with nominal pressures PN2.0 to PN42.0 MPa. GB/T 9123.4-2000 Steel pipe flange covers with annular joints GB/T9123.4-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Steel pipe blank flanges
with ring-joint face
GB/T 9123.4 -2000
Replaces GB/T9123.31～9123.36-1988This standard specifies the types and dimensions of steel pipe blank flanges with ring-joint face with nominal pressure PN of 2.0, 5.0.11.0.15.0, 26.0 and 42.0MPa.
This standard is applicable to steel pipe blank flanges with ring-joint face with nominal pressure PN2.0~PN42.0MPa. 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. All 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
PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0MPa The types of ring-joined steel pipe flange covers shall comply with the provisions of Figure 1, and the sizes shall comply with the provisions of Tables 1 to 6. 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 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
Ring-joint steel pipe flange cover with nominal diameter of 80mm and nominal pressure of 5.0MPa (50bar): Flange cover DN80-PN50RJGB/T9123.4—2000Approved by the State Administration of Quality and Technical Supervision on September 28, 2000, implemented on July 1, 2001Www.bzxZ.net
GB/T9123.4-2000
1) The height of the protruding part is the same as the depth dimension E of the trapezoidal groove, but is not subject to the tolerance of dimension E. The full half-face type with the outline shown by the dotted line is allowed. Figure 1 Ring joint (RJ) steel pipe flange cover
(Applicable to PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0MPa) 274
GB/T9123.4
PN2.0MPa (20bar) Ring joint steel pipe flange cover size Table 1
Connection size
Bolt hole
Center circle
Sealing
PN5.0MPa (50bar) Ring joint steel pipe flange cover size Connection size
Bolt hole
Center circle
Sealing surface
11.1316.66
Two methods Distance between flanges Approximate value Distance between flanges Approximate value GB/T9123.4—2000 PV 11.0MPa (110bar) ring joint steel pipe flange cover size table 3 Connection size Bolt hole Center circle Sealing surface PN 15.0MPa (15Obar) ring joint steel pipe flange cover size Connection size Bolt hole Center circle Sealing surface Use PN 26.0M Pa flange size Ranias 7. 9211. 91
7. 92 11. 91
7.9211.91
11.1316.66
[15.88|26.97
Distance between two flanges
Approximate value
Distance between two flanges
Approximate value
GB/T 9123. 4—2000
PN26.0MPa（260bar）Bad connection surface steel pipe flange cover size table 5
Connection size
Bolt hole
Center circle
Sealing surface
11.1316.66
14.2723.01
15.8826.97
17.4833.32
692. 1520. 6236. 53
PN42.0MPa（420bar）Ring connection surface steel pipe flange cover size Connection size
Bolt hole
Center circle
Sealing surface
7.9211.91
9.5213. 49
127.009.52
12.7019.84
228.6012.7019.84
17.4830.18
17.4833.32
Distance between two flanges
Approximate value
Distance between two flanges
Approximate value
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