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HG/T 20631-2009

Chinese Standard: 'HG/T 20631-2009'
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HG/T 20631-2009English95 Add to Cart 0--15 minutes. Auto immediate delivery. Spiral wound gaskets for use with steel pipe flanges (Class designated) Valid HG/T 20631-2009
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Detail Information of HG/T 20631-2009; HG/T20631-2009
Description (Translated English): Spiral wound gaskets for use with steel pipe flanges (Class designated)
Sector / Industry: Chemical Industry Industry Standard (Recommended)
Classification of Chinese Standard: J15
Classification of International Standard: 23.040.60
Word Count Estimation: 16,190
Date of Issue: 2009-02-05
Date of Implementation: 2009-07-01
Older Standard (superseded by this standard): HG 20631-1997
Quoted Standard: GB/T 912; GB/T 3280; GB/T 4237; GB/T 11253; HG/T 20615; HG/T 20623; HG/T 20635; JB/T 7758.2; JC/T 69; QB/T 3628
Administrative Organization: ?PRC MIIT
Regulation (derived from): Engineering [ 2009 ] No. 27
Summary: This standard specifies the steel pipe flanges (Class Series) with spiral wound gasket of the type, size, technical requirements, marking and signs. This standard applies to HG/T 20615, HG/T 20623 specified nominal pressure Class150 (PN20) ~ Class2500 (PN420) steel pipe flanges with spiral wound gasket.

HG/T 20631-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20631-1997
Spiral Wound Gaskets for Use with Steel Pipe Flanges
(Class Designated)
钢制管法兰用缠绕式垫片
(Class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 of China
Contents
1. Scope ... 3 
2. Normative references ... 3 
3. General provisions ... 3 
4. Dimension ... 6 
5. Technical requirements ... 14 
6. Inspection ... 15 
7. Marking and labeling ... 15 
7.1 Marking and illustration ... 15 
7.2 Labeling ... 16 
Appendix A (Informative) the Applied Minimum Pipe Wall Thickness of the Inside
Diameter of Internal Ring for this Standard ... 18 
1. Scope
This standard specifies the type, dimension, technical requirements and marking of
spiral-wound gasket for use with steel pipe flanges (Class designated).
This standard is applicable to the spiral wound gaskets for use with steel pipe flanges
whose nominal pressures are from C1assl50 (PN20)-C1ass600 (PN110) which are specified
in HG/T 20615 and HG/T 20623.
2. Normative references
The following provisions contained in the following standards are turned into the
provisions of this national standard by being referred in this national standard. For date
reference, the subsequent amendments to (excluding amending error in the text) or revisions
of, any of these publications do not apply. And parties to agreements based on this standard
are encouraged to investigate the possibility of applying the most recent editions of the
standards indicated below. For undated references, its latest edition referred to applies.
GB/T 912 "Hot-rolled Quality Carbon Structural Steel Sheets and Strips"
GB/T 3280 "Cold Rolled Stainless Steel Plate Sheet and Strip"
GB/T 4237 "Hot Rolled Stainless Steel Plate Sheet and Strip"
GB/T11253 "Cold-rolled Quality Carbon Structural Steel Sheets and Strips"
HG/T 20615 "Steel Pipe Flange (Class Designated)"
HG/T 20623 "Major Diameter Steel Pipe Flange (Class Designated)"
HG/T 20635 "Specification for Selection of Steel Pipe Flange, Gaskets and Bolting
(Class designated)"
JB/T 7758.2 "Specifications of Flexible Graphite Sheets"
JC/T 69 "Compressed Asbestos Sheet"
QB/T 3628 "PTFE Raw Material Strip for use with Screw Thread Sealing"
3. General provisions
3.0.1 The type, code name, sectional form and proper type of flange sealing surface of the
gasket shall meet the requirements of Table 3.0.1.
Melting point (℃) - - 327±10
3 Inner ring material shall be of the same or better than corrosion-resisting property as
the metal strip material. Stainless steel material shall meet the requirements of GB/T 3280 or
GB/T 4237. Unless otherwise stated, carbon steel may be adopted for the centering ring.
Carbon steel shall meet the requirements of GB/T 11253 or GB/T 912 and shall be painted,
electroplated or other surface treatment.
4 If other metal strip and filling material are adopted, this shall be indicated at the order
time.
3.0.5 Except for fundamental form, the inner ring shall be adopted for the gasket that the
Class600, Class900, C1ass1500, Class2500 as well as PTFE are taken as filling material.
4. Dimension
4.0.1 Gasket dimension shall meet the requirements of Figure 4.0.1 and Table 4.0.1-1 - Table
4.0.1-4.
4.0.2 Thickness of spirally wound gasket in Table 4.0.1-1 - Table 4.0.1-4 is the height
between the metal strips of the spirally wound part, but it does not contain the thickness of the
filling material that part is tower than the metal strip.
Type A
Type B
Type C
Type D
Figure 4.0.1 Dimension of the Metal Spiral Wound Gasket
(Continued) (mm)
Nominal
dimension
Nominal pressure Class (PN)
Thickness
of
spirally
wound
gasket T
Thickness
of inner
ring type
and
centering
ring type t
Class150 (PN20) Class300 (PN50) Class600 (PN110)
DN NPS
Inside
diameter of
inner ring
D1
Inside
diameter of
the spirally
wound part
D2
Outside
diameter of
the spirally
wound part
D3
Outside
diameter of
the
centering
ring D4
Inside
diameter of
inner ring
D1
Inside
diameter of
the spirally
wound part
D2
Outside
diameter of
the spirally
wound part
D3
Outside
diameter of
the
centering
ring D4
Inside
diameter of
inner ring
D1
Inside
diameter of
the spirally
wound part
D2
Outside
diameter of
the spirally
wound part
D3
Outside
diameter of
the
centering
ring D4
300 12 317.5 339.9 374.7 408.0 317.5 339.9 374.7 421.0 317.5 327.2 374.7 456.0
4.5 3.0
350 14 349.3 371.6 406.4 449.5 349.3 371.6 406.4 484.5 349.3 362.0 406.4 491.0
400 16 400.0 422.4 463.6 513.0 400.0 422.4 463.6 538.5 400.0 412.8 463.6 564.0
450 18 449.3 474.7 527.1 548.0 449.3 474.7 527.1 595.5 449.3 469.9 527.1 612.0
500 20 500.0 525.5 577.9 605.0 500.0 525.5 577.9 653.0 500.0 520.7 577.9 682.0
600 24 603.3 628.7 685.8 716.5 603.3 628.7 685.8 774.0 603.3 628.7 685.8 790.0
15 3/4 14.3 19.1 31.8 62.5 14.3 19.1 31.8 62.5 14.3 19.1 31.8 69.0
20 3/4 20.7 25.4 39.6 69.0 20.7 25.4 39.6 69.0 20.7 25.4 39.6 75.0
25 1 27.0 31.8 47.8 77.5 27.0 31.8 47.8 77.5 27.0 31.8 47.8 84.0
32 411 33.4 39.6 60.5 87.0 33.4 39.6 60.5 87.0 33.4 39.6 60.5 103.0
40 211 41.3 47.8 69.9 97.0 41.3 47.8 69.9 97.0 41.3 47.8 69.9 116.0
50 2 52.4 58.7 85.9 141.0 52.4 58.7 85.9 141.0 52.4 58.7 85.9 144.5
65 212 63.5 69.9 98.6 163.5 63.5 69.9 98.6 163.5 63.5 69.9 98.6 167.0
80 3 81.0 95.3 120.7 166.5 81.0 92.2 120.7 173.0 81.0 92.2 120.7 195.5
Table 4.0.1-2 Dimension of Fundamental Form (A-type) or Inner Ring (B-type) Gaskets for Use with Tongue
and Groove Face and Male-female Face Flange (mm)
Nominal
dimension
Inside
diameter
of inner
ring Dl
Spirally wound part
Thickness
of
spirally
wound
gasket
Thickness
of the
inner ring
A B
DN NPS
Class300-Class2500
(PN50-PN420)
C1ass300-C1assl500
(PN50-PN260)
C1ass2500
(PN420)
Inside
diameter
D2
Outside
diameter
D3
Inside
diameter
D2
Outside
diameter
D3
Inside
diameter
D2
Outside
diameter
D3
15 21 14.3 25.4 34.9 25.4 34.9 20.6 34.9
3.2 2.0
20 43 20.6 33.3 42.9 33.3 42.9 27.0 42.9
25 1 27.0 38.1 50.8 38.1 50.8 31.8 50.8
32 411 34.9 47.6 63.5 47.6 63.5 41.3 63.5
40 211 41.3 54.0 73.0 54.0 73.0 47.6 73.0
50 2 52.4 73.0 92.1 73.0 92.1 60.3 92.1
65 212 63.5 85.7 104.8 85.7 104.8 76.2 104.8
80 3 77.8 108.0 127.0 108.0 127.0 95.3 127.0
100 4 103.2 131.8 157.2 131.8 157.2 120.7 157.2
125 5 128.6 160.3 185.7 160.3 185.7 146.1 185.7
150 6 154.0 190.5 215.9 190.5 215.9 171.5 215.9
200 8 203.2 238.1 269.9 238.1 269.9 222.3 269.9
250 10 254.0 285.8 323.9 285.8 323.9 273.1 323.9
300 12 303.2 342.9 381.0 342.9 381.0 330.2 381.0
350 14 342.9 374.7 412.8 374.7 412.8 — —
400 16 393.7 425.5 469.9 425.5 469.9 — —
450 18 444.5 489.0 533.4 489.0 533.4 — —
500 20 495.3 533.4 584.2 533.4 584.2 — —
600 24 596.9 641.4 692.2 641.4 692.2 — —
(Continued) (mm)
Nominal
dimension Classl50 (PN20) Class300 (PN50)
Thickness
of
spirally
wound
gasket T
Thickness
of inner
ring and
locating
ring t
DN NPS
Inside
diameter
of inner
ring Dl
Inside
diameter
of the
spirally
wound
part D2
Outside
diameter
of the
spirally
wound
part D3
Outside
diameter
of the
locating
ring D4
Inside
diameter
of inner
ring Dl
Inside
diameter
of the
spirally
wound
part D2
Outside
diameter
of the
spirally
wound
part D3
Outside
diameter
of the
locating
ring D4
950 38 958.8 977.9 1019.2 1110 952.5 977.9 1016.0 1053
4.5 3.0
1000 40 1009.6 1028.7 1070.0 1161 1003.3 1022.4 1070.0 1113
1050 42 1060.4 1079.5 1124.0 1218 1054.1 1073.2 1120.8 1165
1100 44 1111.2 1130.3 1177.9 1275 1104.9 1130.3 1181.1 1219
1150 46 1162.0 1181.1 1228.7 1326 1152.7 1177.9 1228.7 1273
1200 48 1212.......
Related standard:   HG/T 20623-2009  HG/T 20627-2009
   
 
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