This standard specifies the types and dimensions of tongue-and-groove flat-welded ring-plate loose-sleeve steel pipe flanges with nominal pressures PN 1.6, 2.5 and 4.0 MPa. This standard applies to tongue-and-groove flat-welded ring-plate loose-sleeve steel pipe flanges with nominal pressures PN1.6 to PN4.0 MPa. GB/T 9121.3-2000 Tongue-and-groove flat-welded ring-plate loose-sleeve steel pipe flanges GB/T9121.3-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Loose plate steel pipe flanges with weld-on collarwith tongue and groove face
GB/T 9121.3—2000
This standard specifies the types and dimensions of flat-on collar-welded steel pipe flanges with nominal pressures PN1.6, 2.5 and 4.0MPa. www.bzxz.net
This standard is applicable to flat-on collar-welded steel pipe flanges with nominal pressures PN1.6 to PN4.0MPa. 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 the 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 flanges
PV1.6, PV2.5 and PN4.0MPa groove flat welded ring plate loose sleeve steel pipe flanges shall comply with the provisions of Figure 1, and the dimensions shall comply with the provisions of Tables 1 to 3.
4 Technical requirements for flanges
4.1 The technical requirements for flanges shall comply with the provisions of GB/T9124. 4.2 The maximum non-impact working pressure of flanges at different temperatures shall comply with the provisions of Appendix A (Standard Appendix) of GB/T9124--2000.
4.3 The welding joint type and slope II size of flanges shall comply with the provisions of Appendix B (Suggestive Appendix) of GB/T9124-2000. 5 Marking
5.1 Flanges should be marked according to nominal diameter, nominal pressure, sealing surface type code, matching steel pipe series code (the matching metric pipe code is "series [", and the matching imperial pipe is not marked) and standard push number. 5.2 The type code of the flange sealing surface should comply with the provisions of GB/T9112. 5.3 Marking example
Sample flat-surface welded ring plate loose sleeve steel pipe flange with nominal diameter of 80 mm and nominal pressure of 4.0 MPa (40 bar) (equipped with pipe making): Flange DN80-PN40T (Series I) GB/T 9121.3-2000 Sample flat-surface welded ring plate loose sleeve steel pipe flange with nominal diameter of 80 mm and nominal pressure of 4.0 MPa (40 bar) (equipped with metric pipe): Flange DN80-PN40G (Series I) GB/T 9121.3--2000 Sample flat-surface welded ring plate loose sleeve steel pipe flange with nominal diameter of 80 mm and nominal pressure of 2.5 MPa (25 bar) (equipped with imperial arm): Flange DN80-PN25 TGB/T 9121.3—2000Approved by the State Administration of Quality and Technical Supervision on September 28, 2000, and implemented from July 1, 2001
GB/T9121.3—2000
Nominal diameter 80mm, nominal pressure 2.5MPa (25bar) grooved flat-welded ring plate loose-sleeve steel pipe flange (matched with British pipe): Flange DN80-PN25GGB/T9121.3—2000X
Figure 1 grooved (TG) flat-welded ring plate loose-sleeve steel pipe flange (applicable to PN1.6, PN2.5 and PN4.0MPa)236
GB/T9121.3-—2000
GB/T9121.3—2000
GB/T9121.3—2000
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