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

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Scope

This standard specifies the type, dimension, technical requirements and marking of
PTFE envelope gaskets for use with steel pipe flanges (Class designated).
This standard is applicable to the PTFE envelope gaskets for use with raised-face steel
pipe flanges that the nominal pressures are Class150 (PN20) and Class300 (PN50) and the
working temperature is less than or equal to 150℃ (specified in HG/T 20615).
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.

Basic Data

Standard ID	HG/T 20628-2009 (HG/T20628-2009)
Description (Translated English)	PTFE envelope gaskets for use with steel pipe flanges (Class designated)
Sector / Industry	Chemical Industry Standard (Recommended)
Classification of Chinese Standard	J15
Classification of International Standard	23.040.60
Word Count Estimation	18,179
Date of Issue	2009-02-05
Date of Implementation	2009-07-01
Older Standard (superseded by this standard)	HG 20628-1997
Quoted Standard	GB/T 3985; GB/T 13404; HG/T 20615; HG/T 20635; QB/T 3625; QB/T 3626
Regulation (derived from)	Engineering [ 2009 ] No. 27
Issuing agency(ies)	Ministry of Industry and Information Technology
Summary	This standard specifies the steel pipe flanges (Class Series) with a Teflon -coated gasket type, size and technical requirements and marking. This standard applies to HG/T 20615 specified nominal Class150 (PN20) and Class300 (PN50), working temperature �� 150��C projecting surface of steel pipe flanges with PTFE envelope gaskets.