1. Scope
This standard specifies the type, dimension, technical requirements, marking and sign of metallic ring joint gaskets for use with steel pipe flanges (Class designated).
This standard is applicable to the metallic ring joint gaskets for use with steel pipe flanges whose nominal pressures are from C1assl50 (PN20)- Class2500 ( 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 222 "Permissible Tolerances for Chemical Composition of Steel Produts"
GB/T 699 "Quality Carbon Structural Steels"
GB/T 1220 "Stainless Steel Bars"
Contents
1. Scope
2. Normative references
3. General provisions
3.1 Type
3.2 Nominal pressure and nominal dimension
3.3 Material and operating requirement
4. Dimension
5. Technical requirements
5.1 Appearance
5.2 Dimension tolerance
5.3 Manufacture
5.4 Inspection
5.5 Performance test and method
6. Inspection
7. Marking and labeling
7.1 Marking and illustration
7.2 Labeling
