HG/T 20606-2009Non-metallic flat gaskets for use with steel pipe flanges (PN designated) (English PDF)

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.

4.0.1 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

Inside

diameter

of the

gasket

1D a

PN10 PN16 Gasket

thickness

Outside

diameter

of the

gasket

Quantity

of the

bolt

hole n

Diameter

of bolt

hole l

Diameter

of the

bolt hole

center

circle

Outside

diameter

of the

gasket

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

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...