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HG/T 20627-2009Non-metallic flat gaskets for use with steel pipe flanges (Class designated) (English PDF)

钢制管法兰非金属平垫片(Class系列)

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Issued by

Ministry of Industry and Information Technology of the People’s Republic of China

Level / Type

National · Recommended

Issue date

February 5, 2009

Implementation date

July 1, 2009

Scope

HG/T 20627-2009 is the English-translated version of 钢制管法兰非金属平垫片(Class系列).

HG/T 20627-2009 is the Chinese standard "Non-metallic flat gaskets for use with steel pipe flanges (Class designated)". Its scope clause reads: diene copolymer and viton; manufacturer's brand shall be indicated.

The applicable pressure, temperature and maximum (P×T) value of the gaskets shall be determined according to the working condition. Its clauses include natural rubber, neoprene, styrene-butadiene rubber, chemigum, ethylene propylene.

It was issued by the Ministry of Industry and Information Technology of the People’s Republic of China on 2009-02-05 and took effect on 2009-07-01.

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Document preview — HG/T 20627-2009

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People’s Republic of China

1. Scope...3
2. Normative references...3
3. Material and working conditions...3
4. Gasket type and dimension...6
5. Technical requirements...14
6. Marking illustration...15

3.0.1 Material category

The materials of the non-metallic flat gaskets for use with steel pipe flanges contain.

1 Natural rubber, neoprene, styrene-butadiene rubber, chemigum, ethylene propylene

diene copolymer and viton;

manufacturer's brand shall be indicated. The applicable pressure, temperature and maximum (P×T) value of the gaskets shall be determined according to the working condition.

3.0.3 Working Conditions

Working conditions of the nonmetallic flat gaskets shall meet the requirements of Table

3.0.3.

Table 3.0.3 Working Conditions of Non-metallic Flat Gaskets

Classification Name Standard Code name

Application Range

Maximum (p×T) (MPa×°C)

Nominal pressureC1ass

Working temperature (°C)

Rubber

Natural rubber

NR 150 -50-+80 60

Neoprene CR 150 -20-+100 60

Chemigum NBR 150 -20- +110 60

Styrene-butadiene rubber SBR 150 -20-+90 60

Ethylene propylene diene copolymer EPDM 150 -30-+140 90

Viton FKM 150 -20-+200 90

Asbestos rubber

Paronite GB/T 3985

XB350

150 -40-+300 650 XB450

Oil-resisting paronite GB/T 539 NY400

Non asbestos fiber rubber

Non asbestos fiber rubber pressing-a

Inorganic fiber b NAS <=300

-40-+290-d

Organic fiber -40-+200

-d

Teflon

PTFE sheet QB/T 3625 PTFE

-50-+100

Expansion PTFE sheet/strip b.c ePTFE

-200-+200-d

Stuffing modified PTFE sheet RPTFE <=300

Flexible graphite sheets

Reinforced flexible graphite sheet-e

JB/T 6628

JB/T 7758.2 RSB <=600

-240-+650(used in oxidative medium. -240 -

+450)

High-temperature mica

High-temperature mica composite plate <=600 -196-+900

Note. 1 Reinforced flexible graphite sheet is compounded by stainless steel impacting or punch drying plate and expanded graphite particle. And stainless steel impacting or punch drying plate plays a role in enhancement.

Table 4.0.2-1 The Dimension Ff-type Gasket for Use with Flat Face Flange Class150 (PN20) (mm)

Nominal dimension Inside diameter of the gasketa Dl

Outside diameter of the gasket

Number of bolt hole n (piece)

Diameter of bolt hole L

Diameter of bolt-hole center circle

Gasket thicknessb T DN NPS

15 21 22 89 4 16 60.3

1.5c

20 411 27 98 4 16 69.9

25 1 34 108 4 16 79.4

32 411 43 117 4 16 88.9

40 211 49 127 4 16 98.4

50 2 6l 152 4 18 120.7

65 212 77 178 4 18 139.7

80 3 89 191 4 18 152.4

100 4 115 229 8 18 190.5

125 5 141 254 8 22 215.9

150 6 169 279 8 22 241.3

200 8 220 343 8 22 298.5

250 10 273 406 12 26 362.0

300 12 324 483 12 26 431.8

350 14 356 533 12 30 476.3

400 16 407 597 16 30 539.8

450 18 458 635 16 33 577.9

500 20 508 699 20 33 635.0

600 24 610 813 20 36 749.3 a D1 is the maximum inside diameter of the gasket. The other diameters of the internal diameters gasket may be determined by the user, but it shall be indicated at the order time.

b Gasket thickness T listed in the table is recommended gasket thickness.

c Rubber blanket thickness is larger than or equal to 1.5mm.

d Rubber blanket thickness is larger than or equal to 3mm.

(Continued) (mm)

Nominal dimension Inside diameter of the gasketa

Outside diameter of the gasket D2

Nominal pressure C1ass

Gasket thicknessb

Wrapping width b DN NPS

125 5 140 196.0 215.0 240.0

1.5

150 6 169 221.5 250.0 265.0

200 8 220 278.5 306.0 319.0

250 10 273 338.0 360.5 399.0

300 12 324 408.0 421.0 456

350 14 356 449.5 484.5 491

400 16 407 513.0 538.5 564.0

450 18 458 548.0 595.5 612

500 20 508 605.0 653.0 682.0

600 24 610 716.5 774.0 790.0 a D1 is the maximum inside diameter of the gasket. The other diameters of the gasket may be determined by the user, but it shall be indicated at the order time.

b Gasket thickness T listed in the table is recommended gasket thickness.

Table 4.0.2-4 RF- and RF-E-type Gasket Dimension for Use with the Raised Face Flange (HG/T 20623 B

Designated) Whose Nominal Diameter is Larger than DN600 (mm)

Nominal dimension Inside diameter of the gasketa

Outside diameter of the gasket D2 Gasket thicknessb

Wrapping width b DN NPS

Nominal pressure Class

650 26 660 724.5 770.0 764.5

700 28 711 775.5 824.0 818.5

750 30 762 826.0 885.0 879.0

800 32 813 880.0 939.0 932.0

850 34 864 933.5 993.0 998.0

900 36 914 985.5 1047.0 1049.0

950 38 965 1043.0 1098.0

1000 40 1016 1093.5 1148.5

1050 42 1067 1144.5 1199.5

1100 44 1118 1195.5 1250.5

1150 46 1168 1254.0 1317.0

1200 48 1219 1305.0 1368.0

1250 50 1270 1356.0 1419.0

1300 52 1321 1406.5 1469.5

1350 54 1372 1462.0 1530.0

1400 56 1422 1513.0 1595.0

1450 58 1473 1578.5 1657.0

1500 60 1524 1629.0 1708.0 a D1 is the maximum inside diameter of the gasket. The other diameters of the gasket may be determined by the user, but it shall be indicated at the order time.

b Gasket thickness T listed in the table is recommended gasket thickness.

Table 4.0.2-6 TG-type Gasket Dimension for Use with Tongue and Groove Face Flange

Class300 (PN50)-Class600 (PN110) (mm)

Nominal dimension

Inside diameter of the gasket

Outside diameter of the gasket D2

Gasket thicknessa

Nominal dimension Inside diameter of the gasket D1

Outside diameter of the gasket D2

Gasket thicknessa

T DN NPS DN NPS

15 21 25.5 35.0

1.5a

150 6 190.5 216.0

1.5a

20 43 33.5 43.0 200 8 238.0 270.0.

25 1 38.0 51.0 250 10 286.0 324.0

32 411 47.5 64.0 300 12 343.0 381.0

40 211 54.0 73.0 350 14 374.5 413.0

50 2 73.0 92.0 400 16 425.5 470.0

65 212 85.5 105.0 450 18 489.0 533.0

80 3 108.0 127.0 500 20 533.5 584.0

100 4 132.0 157.0 600 24 641.5 692.0

125 5 160.5 186.0 a Gasket thickness T listed in the table is recommended gasket thickness.

5. Technical requirements

5.0.1 Dimension tolerance of FF-type and RF-type gaskets shall meet the requirements of

Table 5.0.1.

5.0.2 Dimension tolerance of MFM-type and TG-type gaskets shall meet the requirements of

Table 5.0.2.

Table 5.0.1 Dimension Tolerance of FF-type and RF-type Gaskets (mm)

Nominal dimension <=DN300 (NPSl2) >=DN350 (NPSl4)

Inside diameterD1 ±1.5 ±3.0

Outside diameter D2

-1.5

-3.0

Diameter K of FF-type bolt-hole center circle ±1.5

Adjacent bolt hole center distance ±0.75

Table 5.0.2 Dimension Tolerance of MFM-type and TG-type Gaskets (mm)

Inside diameter D1 Outside diameter D2

+1.0

-1.0

5.0.3 Thickness tolerance of the 1.5mm-thickness gasket is±0.1mm; and thickness tolerance of the gasket whose thickness is larger than or equal to 3mm is±0.20mm. The thickness difference of the same gasket shall not be larger than 0.20mm.

5.0.4 Gasket shall be flat and without buckling deformation. there shall not be slag inclusion, crack, bubble, extr...

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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