HG/T 20628-2009
PTFE envelope gaskets for use with steel pipe flanges(Class designated) (English Version)

Standard No.

HG/T 20628-2009

Language

Chinese, Available in English version

Release Date

2009

Published By

Professional Standard - Chemical Industry

Latest

HG/T 20628-2009

Replace

HG 20628-1997

Scope

This standard specifies the type, size, technical requirements and marking of PTFE-coated gaskets for steel pipe flanges (Class series). This standard applies to raised-face steel pipe flange PTFE-coated gaskets with nominal pressures Class150 (PN20) and Class300 (PN50) specified in HG/T 20615 and operating temperatures less than or equal to 150°C.

HG/T 20628-2009 Referenced Document

• GB/T 13404 Non-metallic PTEF envelope gaskets for pipe flanges
• GB/T 3985 Comoresssed asbentos fibre jointing
• HG/T 20615 Steel pipe flanges(Class designated)
• HG/T 20635 Specification for selection of steel pipe flanges,gaskets and bolting(Class designated)
• QB/T 3625 Polytetrafluoroethylene plate
• QB/T 3626 Polytetrafluoroethylene rod

HG/T 20628-2009 history

• 2009 HG/T 20628-2009 PTFE envelope gaskets for use with steel pipe flanges(Class designated)
• 1997 HG 20628-1997 PTFE coated gaskets for steel pipe flanges (American system)

HG/T 20628-2009 PTFE envelope gaskets for use with steel pipe flanges(Class designated) has been changed from HG 20628-1997 PTFE coated gaskets for steel pipe flanges (American system).

HG/T 20628-2009 PTFE envelope gaskets for use with steel pipe flanges(Class designated) has been changed from HG 20628-1997 PTFE coated gaskets for steel pipe flanges (American system).