1. Scope
This standard specifies the type, dimension, technical requirements, marking and sign of combined covered serrated gasket for use with steel pipe flanges (Class designated).
This standard is applicable to the covered serrated metal gaskets for use with steel pipe flanges whose nominal pressures are from C1assl50 (PN20)-C1ass2500 (PN420) which are specified in HG/T 20615 and HG/T 20623.
2. Normative references
The following provisions contained in the following standards are turned into the provisions of this national standard by being referred in this national standard. For date reference, the subsequent amendments to (excluding amending error in the text) or revisions of, any of these publications do not apply. And parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, its latest edition referred to applies.
GB/T 912 "Hot-rolled Sheets and Strips of Carbon Structural Steels and High Strength Low Alloy Structural Steels"
GB/T 4237 "Hot Rolled Stainless Steel Plate Sheet and Strip"
GB/T 3280 "Cold Rolled Stainless Steel Plate Sheet and Strip"
HG/T 20615 "Steel Pipe Flange (Class Designated)"
HG/T 20623 "Major Diameter Steel Pipe Flange (Class Designated)"
HG/T 20635 "Specification for Selection of Steel Pipe Flange, Gaskets and Bolting (Class designated)"
JB/T 7758.2 "Specifications of Flexible Graphite Sheets"
QB/T 3625 "PTFE Sheet"
1. Scope
2. Normative references
3. General provisions
3.1 Type and code
3.2 Nominal pressure and nominal dimension
3.3 Gasket use
3.4 Material
4. Dimension
5. Technical requirements
6. Inspection
7. Marking and labeling
7.1 Marking and illustration
7.2 Labeling
