This standard specifies the types and dimensions of ring-joint face-welded steel pipe flanges with nominal pressures PN 2.0, 5.0, 11.0, 15.0, 26.0 and 42.0 MPa. This standard applies to ring-joint face-welded steel pipe flanges with nominal pressures PN2.0 to PN42.0 MPa. GB/T 9115.4-2000 Ring-joint face-welded steel pipe flanges GB/T9115.4-2000 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Ring-joint face-welded steel pipe flanges
Steel pipe welding neck flanges with ring-joint faceGB/T9115.4---2000
Replaces GB/T9115.319115.361988
This standard specifies the types and dimensions of ring-joint face-welded steel pipes with nominal pressures PN of 2.0, 5.0, 11.0, 15.0, 26.0 and 42.0MPa.
This standard applies to ring-joint face-welded steel pipe flanges with nominal pressures PN2.0 to PN42.0MPa. 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
PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0MPa The types of ring-joined face-welded steel pipe flanges shall comply with the provisions of Figure 1, and the sizes shall comply with the provisions of Tables 1 to 6. 4 Technical requirements for flanges
4.1 The technical requirements for the legal benefits shall comply with the provisions of GB/T9124, 4.2 The maximum non-impact working pressure of the flange 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 Flanges shall be marked according to nominal diameter, nominal pressure, sealing surface type code 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
Ring-joint face-welded steel pipe flange with nominal diameter of 80mm and nominal pressure of 5.0MPa (50bar): Flange DN80-PN50RJGB/T9115.4—2000Approved by the State Administration of Quality and Technical Supervision on September 28, 2000Implementation on July 1, 2001
GB/T 9115. 4 -2000
1) The height number of the western part is the same as the depth dimension E of the trapezoidal groove. However, it is not limited by the tolerance of dimension E. It is allowed to adopt the full plane type with the outline shown by the dotted line. Figure 1 Ring joint (RJ) butt welding steel pipe flange (applicable to PN2.0, PN5.0, PN11.0, PN15.0, PN26.0 and PN42.0 MPa) 112
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