This standard specifies the types and dimensions of ring-joint face-welded ring-neck loose-sleeve 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 ring-neck loose-sleeve steel pipe flanges with nominal pressures PN2.0 to PN42.0 MPa. GB/T 9118.2-2000 Ring-joint face-welded ring-neck loose-sleeve steel pipe flanges GB/T9118.2-2000 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Loose hubbed steel pipe flanges with welding neck coliarwith ring-joint Tace
1 Scope
GB/T 9118.2--2000
Replaces GB/T 9118.3~-9118.8 ---1988This standard specifies the types and dimensions of loose hubbed steel pipe flanges with welding neck coliar with nominal pressure PN of 2.0, 5.0, 11.0, 15.0, 26.0 and 42.0MPa.
This standard is applicable to loose hubbed steel pipe flanges with welding neck coliar with nominal pressure PN2.0~PN42.0MPa. 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 all valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GI3/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, PN1I.0, PN15.0, PN26.0 and PN42.0MPa The type of ring-joined face-to-face welded ring with neck loose sleeve steel pipe flanges shall comply with the provisions of Figure 1. The dimensions shall comply with the provisions of Tables 1 to 6. 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 (Appendix to the standard) of GB/T91242000.
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 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 connection face-to-face welding ring with neck loose sleeve steel pipe flange with nominal diameter 80mm and nominal pressure 5.0MPa (50bar): Flange DN80-PN50 RJ GB/T 9118.2-2000 Approved by the State Administration of Quality Supervision, Inspection and Quarantine on September 28, 2000 188
Implementation on 2001:07:01
GB/T 9118. 2-2000
Note: t is the wall thickness of the short section, which is generally the wall thickness of the steel pipe; t2 should not be less than the minimum wall thickness of the steel pipe. Figure 1 Ring joint (RJ) butt welding ring with neck loose sleeve steel pipe flange (applicable to PN2.0, PN5.0, PN11.0, PN15.0., PN26.0 and PN42.0 MPa) 189
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