This standard specifies the types and dimensions of tongue-and-groove facing 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 facing welded ring plate loose-sleeve steel pipe flanges with nominal pressures PN1.6 to PN4.0 MPa. GB/T 9120.3-2000 Tongue-and-groove facing welded ring plate loose-sleeve steel pipe flanges GB/T9120.3-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Loose plate steel pipe flanges with welding neck collarwith tongue and groove face
GB/T9120.3—2000
Replaces GB/T9120.59120.6--1988
This standard specifies the types and dimensions of grooved face welded ring plate loose sleeve steel pipe flanges with nominal pressure PN of 1.6, 2.5 and 4.0MPa.
This standard is applicable to grooved face welded ring plate loose sleeve steel pipe flanges with nominal pressure PN1.6～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 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
PN1.6, PN2.5 and PN4.0MPa The types of the groove-faced welded ring plate loose-fitting 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 groove size of the flange shall comply with the provisions of Appendix B (Suggestive Appendix) of GB/T9124-2000 5 Marking
5.1 The flange shall be marked according to the nominal diameter, nominal pressure, sealing surface type code, matching steel pipe series code (the matching metric pipe code is "Series I", and the matching British pipe is not marked) and standard number. 5.2 The type code of the flange sealing surface shall comply with the provisions of GB/T9112. 5.3 Marking example
Face-to-face welded 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-PN40T (Series I) GB/T 9120.3~2000Face-to-face welded 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 1) GB/T9120.3--2000Face-to-face welded plate loose-sleeve steel pipe flange with nominal diameter of 80 mm and nominal pressure of 2.5 MPa (25 bar) (equipped with imperial pipe): Flange DN80-PN25 T GB/T 9120.3--2000Approved by the State Administration of Quality and Technical Supervision on September 28, 2000Implementation on July 1, 2001Www.bzxZ.net
GB/T9120.3-2000
Nominal diameter 80mm, nominal pressure 2.5MPa (25bar) groove face welding ring plate loose sleeve steel pipe flange (matching British pipe): flange DN80-PN25GGB/T9120.3--2000N
Figure 1 Groove face (TG) welding ring plate loose sleeve steel pipe flange is suitable for PN1.6, PN2.5 and PN4.0MPa) 218
GB/T9120.3-2000
9120.3--2000
GB/T 9
GB/T9120.3-2000
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