HG 20621-1997
Butt welding ring loose sleeve steel pipe flange (American system) (English Version)

Standard No.

HG 20621-1997

Language

Chinese, Available in English version

Release Date

1997

Published By

Professional Standard - Chemical Industry

Status

Be replaced 2009-07

Replace By

HG/T 20615-2009

Latest

HG/T 20615-2009

Scope

This standard specifies the type, size, technical requirements and relevant usage regulations of butt welding ring loose sleeve steel pipe flanges (American system). This standard is applicable to butt welding ring loose sleeve steel pipe flanges with nominal pressure PN2.0MPa (Class 150) ~ 11.0MPa (Class 600).

HG 20621-1997 history

• 2009 HG/T 20615-2009 Steel pipe flanges(Class designated)
• 1997 HG 20621-1997 Butt welding ring loose sleeve steel pipe flange (American system)

HG 20621-1997 Butt welding ring loose sleeve steel pipe flange (American system) was changed to HG/T 20615-2009 Steel pipe flanges(Class designated).