HG/T 20631-2009 English PDF (HGT20631-2009)

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HG/T 20631-2009: Spiral wound gaskets for use with steel pipe flanges (Class designated)
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)
(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