1. Scope
This standard specifies the general rules for the selection of steel pipe flanges, gaskets and bolting (C1ass designated).
This standard is applicable to the steel pipe flanges, gaskets and bolting specified in HG/T 20615- HG/T 20634.
2. Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not apply. However, parties to agreement based on this standard are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this national standard.
"Steel Pipe Flanges (Class Designated)" HG/T 20615
"Steel Pipe Flanges in Large Diameter (C1ass designated)" HG/T 20623
"Non-metallic Flat Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20627
"PTFE Envelope Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20628
"Metal Jacketed Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20630
"Spiral Wound Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20631
"Covered Serrated Metal Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20632
"Metallic Ring Joint Gaskets for use with Steel Pipe Flanges (C1ass designated)" HG/T 20633
"Bolting for use with Steel Pipe Flanges (C1ass designated)" HG/T 20634
3. Selection rules
Contents
1. Scope
2. Normative references
3. Selection Rules
3.1 Pipe Flanges
3.2 Gaskets
3.3 Bolting
3.4 Flange joints
Appendix A (Informative Appendix) Use Direction of the Gaskets for Pipe Flange
