1. Scope
This standard specifies the type, dimension, technical requirements, labeling and marking of the spiral wound gaskets for steel pipe flanges (PN designated).
This standard is applicable to the spiral wound gaskets for steel pipe flanges specified in HG/T 20592 whose nominal pressure is PN16-PN160.
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 agreements 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.
"Hot-rolled Plain Carbon and Low Alloy Structural Steel Sheets and Strips" GB/T 912
"Cold Rolled Stainless Steel Plate Sheets and Strips” GB/T 3280
"Hot Rolled Stainless Steel Plate Sheets and Strips” GB/T 4237
"Cold-rolled Plain Carbon and Low Alloy Structural Steel Sheets and Strips” GB/T 11253
"Steel Pipe Flanges (PN designated)" HG/T 20592
“Specification for selection of Steel Pipe Flanges, Gaskets and Bolting (PN designated)” HG/T 20614
"Specification for Flexible Graphite Plates" TB/T 7758.2
"Compressed Asbestos Sheet" JC/T 69
"PTFE Unsintered Tape for Screw Sealing" QB/T 3628
3. General provisions
