HG/T 20606-2009 PDF English
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Non-metallic flat gaskets for use with steel pipe flanges (PN designated)
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HG/T 20606-2009: PDF in English (HGT 20606-2009) HG/T 20606-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20606-1997, HG 20608-1997
Non-metallic F1at Gaskets for use with Steel 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
Contents
1. Scope ... 3
2. Normative references ... 3
3. Materials and service conditions ... 3
3.1 Material category ... 3
3.2 Materials ... 4
3.3 Service conditions ... 5
3.4 Applicable nominal pressure scope of the gaskets ... 7
3.5 Adoption of gasket material and thickness ... 7
3.6 The fitting between the gaskets and flanges or bolting ... 7
4. Gasket pattern and dimension ... 7
5. Technical requirement ... 12
6. Marking illustration ... 13
1. Scope
This national standard specifies the pattern, dimension, technical requirements and marking
of non-metallic flat gaskets (with or without insertion) for use with steel pipe flanges (PN
designed).
This Standard is applicable to non-metallic flat gaskets for use with steel pipe flange in
nominal pressure of PN2.5~PN63 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.
“Rubber, Vulcanized or Thermoplastic-Determination of Tensile Stress-Strain Properties”
GB/T 528
"Oil-resisting Compressed Asbestos Fibre Jointing" GB/T 539
"Cold Rolled Stainless Steel Plate Sheet and Strip" GB/T 3280
"Compressed Asbestos Fibre Jointing" GB/T 3985
"Steel Pipe Flanges (PN designated)" HG/T 20592
"Specification for selection of Steel Pipe Flanges, Gaskets and Bolting (PN designated)"
HG/T 20614
"The Classification, Code and Sign of Flexible Graphite Sheets/Strip" JB/T 6613
"Reinforced Flexible Graphite (Sheets) Gaskets" JB/T 6628
"Specifications of Flexible Graphite Sheets" JB/T 7758.2
"PTFE Sheets" QB/T 3625
3. Materials and service conditions
3.1 Material category
Materials of non-metallic flat gaskets for use with steel pipe flanges usually include.
confirmed by the service operating condition.
3.2.7 The expanded PTFE strip is generally used for maintenance and service of pipe flange,
particularly, in emergency occasions; it may also be used for special pipe flanges. When it is
being used, the authorized manufacturer's brand shall be indicated.
3.2.8 When adopting non-asbestos fiber sheet gasket, authorized manufacturer's brand shall
be indicated. The applicable pressure, applicable temperature and maximum (p×T) value of
the gasket shall be confirmed by the service operating condition.
3.3 Service conditions
Service conditions of non-metallic flat gaskets shall be in accordance with those
specified in Table 3.3.
range and maximum (P×T) value of the products.
c The expanded PTFE strip is generally used for maintenance and service of pipe flange, particularly, in emergency
occasions; it may also be used for special pipe flanges.
d When it is used higher than this temperature range or the saturated vapor pressure is greater than 1.0MPa (gage
pressure), applicable conditions of specific products shall be confirmed.
3.4 Applicable nominal pressure scope of the gaskets
Nominal pressure scope of gaskets for flanges on different seal contact face see the
requirement of Table 3.4.
Table 3.4 Nominal Pressure Scope of Gasket for Flanges on Different Seal Contact Face
Sealing surface type (code) Nominal pressure PN
Flat face (FF) 2.5~16
Raised face (RF) 2.5~63
Male/female Face (MF/M) 10~63
Tongue/groove Face (T/G) 10~63
3.5 Adoption of gasket material and thickness
When adopting the material and thickness of the gasket, operating media, service
operating condition, flange sealing surface pattern, roughness of surface and bolt load impacts
shall be considered. The supplier should be advisory and confirmed for gaskets used for
critical occasions.
3.6 The fitting between the gaskets and flanges or bolting
The fitting between the gaskets and flanges or bolting complies with the requirements of
HG/T 20614.
4. Gasket pattern and dimension
4.0.1 According to sealing surface type, the gaskets are consisted of FF type, RF type, MFM
type and TG types, which are applicable to flat face, raised face, male/female face and
tongue/groove face flanges respectively, see Figure 4.0.1. The reinforced flexible graphite
sheets gaskets and high-temperature mica composite sheet gaskets are only applicable to
flanges with raised face, male/female face and tongue/groove face.
Table 4.0.2-1 (Continued) (mm)
Nominal
dimension
DN
Inside
diameter
of the
gasket
1D a
PN10 PN16 Gasket
thickness
Outside
diameter
of the
gasket
2D
Quantity
of the
bolt
hole n
Diameter
of bolt
hole l
Diameter
of the
bolt hole
center
circle
Outside
diameter
of the
gasket
2D
Quantity
of the
bolt
hole n
Diameter
of bolt
hole
Diameter
of the
bolt hole
center
circle K
10 18 90 4 14 60 90 4 14 60 1.5d
15 22 95 4 14 65 95 4 14 65
20 27 105 4 14 75 105 4 14 75
25 34 115 4 14 85 115 4 14 85
32 43 140 4 18 100 140 4 18 100
40 49 150 4 18 110 150 4 18 110
50 61 165 4 18 125 165 4 18 125
65 77 185 8b 18 145 185 8b 18 145
80 89 200 8 18 160 200 8 18 160
100 115 220 8 18 180 220 8 18 180
125 141 250 8 18 210 250 8 18 210
150 169 285 8 22 240 285 8 22 240
200 220 340 8 22 295 340 12 22 295
250 273 395 12 22 350 405 12 26 355
300 324 445 12 22 400 460 12 26 410
350 377 505 16 22 460 520 16 26 470 3a
400 426 565 16 26 515 580 16 30 525
450 480 615 20 26 565 640 20 30 585
500 530 670 20 26 620 715 20 33 650
600 630 780 20 30 725 840 20 36 770
700 720 895 24 30 840 910 24 36 840
800 820 1015 24 33 950 1025 24 39 950
900 920 1115 28 33 1050 1125 28 39 1050
1000 1020 1230 28 36 1160 1255 28 42 1170
1200 1220 1455 32 39 1380 1485 32 48 1390
1400 1422 1675 36 42 1590 1685 36 48 1590
1600 1626 1915 40 48 1820 1930 40 56 1820
1800 1829 2115 44 48 2020 2130 44 56 2020
2000 2032 2325 48 48 2230 2345 48 62 2230
a D1 is the maximum inside diameter of the gasket. The users may specify inside diameter dimension of other gaskets, but
it shall be indicated when ordering.
b It may also be connected to pipe flange with four bolt holes.
c Gasket thickness T listed in the table is the recommended gasket thickness.
d The thickness of the rubber gasket is greater than or equal to 1.5mm.
e The thickness of the rubber gasket is greater than or equal to 3mm.
Table 4.0.2-2 Dimensions of RF and RF-E type Gasket for Flange with Raised Face (mm)
Nominal
dimension
DN
Inside diameter of the
gasket
D1
Outside diameter of the gasketD2 Gasket
thickness
Wrapping
width
Nominal pressure PN
2.5 6 10 16 25 40 63
10 18 39 39 46 46 46 46 56
15 22 44 44 51 51 51 51 61
20 27 54 54 61 61 61 61 72
25 34 64 64 71 71 71 71 82
32 43 76 76 82 82 82 82 88
40 49 86 86 92 92 92 92 103
50 61 96 96 107 107 107 107 113
65 77 116 116 127 127 127 127 138
1.5 3
80 89 132 132 142 142 142 142 148
100 115 152 152 162 162 168 168 174
125 141 182 182 192 192 194 194 210
150 169 207 207 218 218 224 224 247
200 220 262 262 273 273 284 290 309
250 273 317 317 328 329 340 352 364
300 324 373 373 378 384 400 417 424
350 377 423 423 438 444 457 474 486
400 426 473 473 489 495 514 546 543
450 480 528 528 539 555 564 571 -
500 530 578 578 594 617 624 628 -
600 630 679 679 695 734 731 747 -
700 720 784 784 810 804 833 - -
800 820 890 890 917 911 942 - -
900 920 990 990 1017 1011 1042 - -
1000 1020 1090 1090 1124 1128 1154 - -
1200 1220 1290 1307 1341 1342 1364 - -
1400 1422 1490 1524 1548 1542 - - -
1600 1626 1700 1724 1772 1764 - - -
5 1800 1829 1900 1931 1972 1964 - - -
2000 2032 2100 2138 2182 2168 - - -
Note. 1 D1 is the maximum inside diameter of the gasket. The users may specify inside diameter dimension of other
gaskets, but it shall be indicated when ordering.
2 The gasket thickness T listed in the table is the recommended gasket thickness.
Table 5.0.1 Dimension Tolerances of FF Ty...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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