This standard specifies the types and dimensions of raised face flat welded ring plate loose sleeve steel pipe flanges with nominal pressures PN 0.6, 1.0, 1.6, 2.5 and 4.0 MPa. This standard applies to raised face flat welded ring plate loose sleeve steel pipe flanges with nominal pressures PN0.6 to PN4.0 MPa. GB/T 9121.1-2000 Raised face flat welded ring plate loose sleeve steel pipe flanges GB/T9121.1-2000 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 raised face
GB/T 9121.1--2000
Replaces GB/T 9121.1~9121.4--1988This standard specifies the types and dimensions of raised face flat welded collared steel pipe flanges with nominal pressures PN of 0.6, 1.0, 1.6, 2.5 and 4.0MPa.
This standard is applicable to raised face flat welded collared steel pipe flanges with nominal pressures PN0.6~PN4.0MPa. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. The versions shown are all valid when this standard is issued. 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 flanges
PNO.6, PN1.0, PN1.6, PN2.5 and PN4.0MPa The type of raised face flat welding ring plate loose sleeve steel pipe flanges shall comply with the provisions of Figure 1, and the size shall comply with the provisions of Tables 1 to 5. 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 flanges shall comply with the provisions of Appendix B (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 (matching metric pipe code is Series II. 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
Raised face flat welded ring plate loose sleeve steel pipe flange with nominal diameter of 80mm and nominal pressure of 4.0MPa (40bar) (matching metric pipe): Flange DN80-PN40RF (Series 1) GB/F9121.1---2000 Raised face flat welded ring plate loose sleeve steel pipe flange with nominal diameter of 80mm and nominal pressure of 2.5MPa (25bar) (matching British pipe): Flange DN80-PN25RF GB/T 9121.1—2000Approved by the State Administration of Quality and Technical Supervision on September 28, 2000, and implemented on July 1, 2001www.bzxz.net
GB/T9121.1-2000
Figure 1 Raised face (RF) flat welded ring plate loose sleeve steel pipe cover (applicable to PN0.6, PN1.0, PN1.6, PN2.5 and PN4.0 MPa) GB/T9121.1--2000
GB/T9121.1--2000
In the figure
GB/T9121.1—2000
GB/T 9121.1-2000
GB/T9121.1—2000
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