This standard specifies the types and dimensions of concave and convex 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 concave and convex flat welded ring plate loose sleeve steel pipe flanges with nominal pressures PN1.6 to PN4.0 MPa. GB/T 9121.2-2000 Concave and convex flat welded ring plate loose sleeve steel pipe flanges GB/T9121.2-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Loose plate steel pipe flanges with weld-on collar with male and female face
GB/T 9121.2-: 2000
Replaces GB/T 9121.5-9121,61988
This standard specifies the types and dimensions of concave and convex face flat welded ring plate loose sleeve steel pipe flanges with nominal pressure PV of 1.6, 2.5 and 4.0MPa.
This standard is applicable to concave and convex face flat 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/T91122000 Types and parameters of steel pipe flanges GB/T9124:2000 Technical conditions for steel pipe flanges 3 Types and sizes of flanges
PV1.6, PN2.5 and PN4.0MPa The type of concave and convex flat welded ring plate loose sleeve steel pipe method shall comply with the provisions of Figure 1, and the size shall comply with the provisions of Tables 1 to 3. bzxZ.net
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 (Suggested 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
Convex flat 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/T9121.2--2000Concave flat 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 DN80PN40F (Series I) GB/T9121.2--2000Convex flat 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-PN25M GB/T 9121.2-2000 Approved by the State Administration of Quality and Technical Supervision on September 28, 2000 230
2001-0701 Implementation
GB/T 9121.2-2000
Concave flat-welded 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-PN25FGB/T9121.2--2000K
Figure 1 Concave and convex surface (MF) flat-welded ring-plate loose-sleeve steel pipe flange (applicable to PN1.6, PN2.5 and PN4.0MPa) 231
GB/T9121.2-2000
GB/T9121.2-
GB/T 9121. 2-
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