1. Scope
This standard specifies the type, dimension and technical requirements of non-metallic flat gaskets (with insertion or without insertion) for use with steel pipe flanges.
This standard is applicable to the non-metallic flat gaskets for use with steel pipe flanges whose nominal pressures from C1assl50 (PN20)-C1ass600 (PN110) are specified in HG/T 20615 and HG/T 20623.
Note: As for the use of the gaskets in which contain the material of asbestos, it shall meet the requirements of the relevant laws and regulations. If the aforesaid gaskets are used, the protective measures shall be adopted to prevent man from damaging.
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 528 "Rubber, Vulcamized or Thermoplastic--Determination of Tensile Stress-strain Properties"
GB/T 539 "Oil-resisting compressed asbestos fiber jointing"
GB/T 3280 "Cold rolled stainless steel plate sheet and strip"
GB/T 3985 "Compressed asbestos fiber jointing"
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 6613 "The classification code and sign of flexible graphite sheets/strip"
JB/T 6628 "Reinforced flexible graphite (sheets) gaskets"
JB/T 7758.2 "Specifications of flexible graphite sheets"
QB/T 3625-1999 "PTFE sheet"
1. Scope
2. Normative references
3. Material and working conditions
4. Gasket type and dimension
5. Technical requirements
6. Marking illustration
