This standard specifies the types and dimensions of convex and concave face welded ring plate loose sleeve steel pipe flanges with nominal pressure PN of 1.6, 2.5 and 4.0 MPa. This standard applies to convex and concave face welded ring plate loose sleeve steel pipe flanges with nominal pressure PN1.6~PN4.0 MPa. GB/T 9120.2-2000 Concave and convex face welded ring plate loose sleeve steel pipe flanges GB/T9120.2-2000 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 maleand female facebzxz.net
GB/T 9120.2---2000
Replaces GB/T9120.3~9120.4--1988
This standard specifies the types and dimensions of loose plate steel pipe flanges with welding neck collarwith maleand female face with nominal pressure PN of 1.6, 2.5 and 4.0MPa.
This standard is applicable to loose plate steel pipe flanges with welding neck collarwith maleand female face with nominal pressure PN1.6~PN4.0MPa. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by 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 type of the loose-fitting steel pipe flange with concave and convex faces welded ring plate shall comply with the provisions of Figure 1, and the size 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 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 I", and the matching British pipe code is not marked) and standard number. 5.2 The type code of the flange sealing surface should comply with the provisions of GB/T9112. 5.3 Marking example
Convex face welded ring plate loose sleeve steel pipe flange with nominal diameter of 80mm and nominal pressure of 4.0MPa (40bar) (equipped with metric pipe): Flange DN80-PN40M (Series I) GB/T9120.2-2000Concave face welded ring plate loose sleeve steel pipe flange with nominal diameter of 80mm and nominal pressure of 2.5MPa (25bar) (equipped with metric pipe): Flange DN80-PN25F (Series I) GB/T 9120.22000Convex face welded ring plate loose sleeve steel pipe flange with nominal diameter of 80mm and nominal pressure of 2.5MPa (25bar) (equipped with imperial pipe): Flange DN80-PN25 MGB/T 9120.2--2000Approved by the State Administration of Quality and Technical Supervision on September 28, 2000212
Implementation on July 1, 2001
GB/T9120.2-2000
Concave face welding ring plate loose sleeve steel pipe flange with nominal diameter of 80mm and nominal pressure of 2.5MPa (25bar) (equipped with British pipe): Flange DN80-PN25FG B/T9120.2—2000N
Figure 1 Concave and convex surface (MF) butt welding ring plate loose sleeve steel pipe flange (applicable to PN1.6, PN2.5 and PN4.0MPa) 213
GB/T9120.2-2000
GB/T9120.2—2000
089805
GB/T9120.2-2000
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