HG/T 20607-2009 PDF English
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PTFE envelope gaskets for use with steel pipe flanges (PN designated)
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HG/T 20607-2009: PDF in English (HGT 20607-2009) HG/T 20607-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20607-1997
PTFE Enve1ope Gaskets for use with Stee1 Pipe
F1anges
(PN Designated)
(PN系列)
ISSUED ON. FEBRUARY 5, 2009
IMPLEMENTED ON. JULY 1, 2009
Issued by. Ministry of Industry and Information Technology of the People's
Republic China
[Including Corrigendum/Modification confirmed in May 2012. Text in RED]
Contents
1. Scope ... 3
2. Normative references ... 3
3. Gasket pattern and dimension ... 3
4. Technical requirement ... 6
5. Marking and packaging ... 6
1. Scope
This national standard specifies pattern, dimension, and technical requirement and
marking of PTFE envelope gasket for use with steel pipe flanges (PN designated).
This Standard is applicable to PTFE envelope gasket for use with steel pipe flange with
raised face in nominal pressure of PN6~PN40 and in working temperature of less than or
equal to 150 specified in HG/T 20592. ℃
Note. the use of the asbestos-contained material shall comply with requirements of relevant laws and regulations. When the
production and use are containing asbestos material gasket, protective measures shall be adopted, so as to ensure not endanger
the person health.
2. Normative references
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. For dated reference, subsequent amendments
(excluding content of corrigenda) to, or revisions of, any of these publications do not apply.
However, Parties to agreements biased on this Code are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. For undated
references, the latest edition of the normative document referred to applies.
"Compressed Asbestos Fibre Jointing" GB/T 3985
"Non-metallic PTFE Envelope Gaskets for Pipe Flanges" GB/T 13404
"Steel Pipe Flanges (PN designated)" HG/T 20592
"Specification for selection of Steel Pipe Flanges, Gaskets and Bolting (PN designated)"
HG/T 20614
"PTFE Sheets" QB/T 3625
"PTFE Rods" QB/T 3626
3. Gasket pattern and dimension
3.0.1 According to the type of cutting process, the gasket pattern is consisted of sectioning
type, machining type and fold-packaging type, which are respectively denoted by A-type,
B-type and C-type, Figure3.0.1. A-type and B-type are applicable to occasion in nominal
dimension of less than or equal to DN500, B-type is recommended to be adopted; while
C-type is applicable to occasion in nominal dimension of greater than or equal to DN350.
3.0.2 Gasket dimension
1 The dimensions of A-type, B-type and C-type gasket comply with the requirements of
Table 3.0.2-1 and Table 3.0.2-2.
2 The gasket thickness T shown in Table 3.0.2-1 and Table 3.0.2-2 is recommended
Table 3.0.2-2 Dimension of PTFE Envelope Gaskets (C-type) (mm)
Nominal
dimension
DN
Inside diameter of the
coating
1D
Outside diameter of the
coating
3D mm
Outside diameter of the
gasket 4D
Gasket
thickness
T Nominal pressure PN
350 377 412 423 438 444 457 474
400 426 469 473 489 495 514 546
450 480 528 528 539 555 564 571
500 530 578 578 594 617 624 628
600 630 679 679 695 734 731 747
Note. The gasket thickness T listed in the table is the recommended gasket thickness. The users may specify other gasket
thickness, but that shall be indicated when ordering.
4. Technical requirement
4.0.1 PTFE coating material shall comply with the requirements of FSB-2 and QB/T 3626
specified in QB/T 3625.
4.0.2 The embedded layer or core materials are generally asbestos rubber sheet or
non-asbestos fiber sheet. If the user has any special requirement, other appropriate materials
may be adopted, but that shall be indicated when ordering.
4.0.3 The dimension tolerances of the inside diameter D1 and outside diameter D4 of the
gasket are in accordance with those specified in Table 4.0.3. The coating thickness tolerance
is ±0.05mm and the gasket thickness tolerance is ±0.25mm.
4.0.4 The coating surface shall be level up, lubricate, buckling deformation-free, even in
thickness and disallow defects like perforated hole and slag inclusion.
4.0.5 The compression rate, resilience, stress relaxation rate and seal leakage rate of the
gaskets shall comply with the requirements of GB/T 13404.
Table 4.0.3 Dimension Tolerances of Inside Diameter D1 and Outside Diameter D2 of the Gaskets (mm)
Nominal dimension DN ≤300 ≥350
Inside diameter of the coating 1D ±1.5 ±3.0
Outside diameter of the gasket 4D
+1.5
+3.0
5. Marking and packaging
5.0.1 The gaskets shall be packed according to pattern, specification and material respectively;
when being delivered, it shall be attached with production quality test certificate. The gaskets
shall indicate content specified in 5.0.2 by labels.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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