PDF HG/T 20633-2009 English (HG 20633-1997: Older version)
Search result: HG/T 20633-2009 (HG 20633-1997 Older version)
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Metallic ring joint gaskets for use with steel pipe flanges (Class designated)
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| HG 20633-1997 | English | RFQ |
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(Steel pipe flanges with metal ring gasket (American System))
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PDF Preview: HG/T 20633-2009
HG/T 20633-2009: PDF in English (HGT 20633-2009) HG/T 20633-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20633-1997
Metallic Ring Joint 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
[Including Corrigendum/Modification confirmed in May 2012. Text in RED]
Contents
1. Scope ... 3
2. Normative references ... 3
3. General provisions ... 3
3.1 Type ... 3
3.2 Nominal pressure and nominal dimension ... 4
3.3 Material and operating requirement ... 4
4. Dimension ... 5
5. Technical requirements ... 9
5.1 Appearance ... 9
5.2 Dimension tolerance ... 9
5.3 Manufacture ... 10
5.4 Inspection ... 10
5.5 Performance test and method ... 10
6. Inspection ... 10
7. Marking and labeling ... 11
7.1 Marking and illustration ... 11
7.2 Labeling ... 11
1. Scope
This standard specifies the type, dimension, technical requirements, marking and sign of
metallic ring joint gaskets for use with steel pipe flanges (Class designated).
This standard is applicable to the metallic ring joint gaskets for use with steel pipe
flanges whose nominal pressures are from C1assl50 (PN20)- Class2500 (PN420) 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 222 "Permissible Tolerances for Chemical Composition of Steel Produts"
GB/T 699 "Quality Carbon Structural Steels"
GB/T 1220 "Stainless Steel Bars"
GB/T 6060.2 "Roughness Comparison Specimens-Ground, Turned, Bored, Milled,
Shaped and Planed"
GB/T 6983 "Technical Requirements for Magnetic Iron Bars"
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 4726 "Carbon and Low-alloy Steel Forgings for Pressure Vessels"
JB 4728 "Stainless Steel Forgings for Pressure Vessels"
3. General provisions
3.1 Type
As for metallic ring joint gaskets for use with the flange with ring-groove sealing surface,
it shall be classified into elliptic type and octagonal type according to the sectional form (see
Figure 3.1).
Table 3.3.1 Material, Code Name and Maximum Service Temperature of Metal Ring Joint Gaskets
The material of the metal ring joint gaskets Maximum hardness Code name Maximum service temperature (℃)
Steel grade Standard HBS HRB
Pure irona GB/T 9971 90 56 D 540
10 GB/T 699 120 68 S 540
1Cr5M0 JB 4726 130 72 F5 650
0Cr13
JB 4728
GB/T 1220
170 86 410S 650
0Cr18Ni9 160 83 304 700b
00Cr19Ni10 150 80 304L 450
0Cr17Ni12M02 160 83 316 700b
00Cr17Ni14M02 150 80 316L 450
0Cr18Ni10Ti 160 83 321 700b
0Cr18Ni11Nb 160 83 347 700b
a The chemical composition of the pure iron is as follows.
C Si Mn P S
≤0.05 ≤0.40 ≤0.60 ≤0.035 ≤0.040
b If the temperature of the wording condition exceeds 540℃, it shall be agreed with the manufacturing plant.
4. Dimension
The dimension of the metal ring joint gaskets shall meet the requirements of Figure 3.1,
Table 4-1 and Table 4-2.
Table 4-2 Dimension Table of the Metal Ring Joint Gaskets (mm)
Ring Number R Pitch diameter P Ring width A
Ring height The width of the ring
plane for the octagonal
gasket C
Radius of
rounded angle rElliptic type B Octagonal gasket H
R11 34.14 6.35 11.11 9.53 4.32 1.6
R12 39.67 7.94 14.29 12.70 5.23 1.6
R13 42.88 7.94 14.29 12.70 5.23 1.6
R14 44.45 7.94 14.29 12.70 5.23 1.6
R15 47.63 7.94 14.29 12.70 5.23 1.6
R16 50.80 7.94 14.29 12.70 5.23 1.6
R17 57.15 7.94 14.29 12.70 5.23 1.6
R18 60.33 7.94 14.29 12.70 5.23 1.6
R19 65.07 7.94 14.29 12.70 5.23 1.6
R20 68.27 7.94 14.29 12.70 5.23 1.6
R21 72.23 11.11 17.46 15.88 7.75 1.6
R22 82.55 7.94 14.29 12.70 5.23 1.6
R23 82.55 11.11 17.46 15.88 7.75 1.6
R24 95.25 11.11 17.46 15.88 7.75 1.6
R25 101.60 7.94 14.29 12.70 5.23 1.6
R26 101.60 11.11 17.46 15.88 7.75 1.6
R27 107.95 11.11 17.46 15.88 7.75 1.6
R28 111.13 12.70 19.05 17.46 8.66 1.6
R29 114.30 7.94 14.29 12.70 5.23 1.6
R30 117.48 11.11 17.46 15.88 7.75 1.6
R31 123.83 11.11 17.46 15.88 7.75 1.6
R32 127.00 12.70 19.05 17.46 8.66 1.6
R35 136.53 11.11 17.46 15.88 7.75 1.6
R36 149.23 7.94 14.29 12.70 5.23 1.6
R37 149.23 11.11 17.46 15.88 7.75 1.6
R38 157.18 15.88 22.23 20.64 10.49 1.6
R39 161.93 11.11 17.46 15.88 7.75 1.6
R40 171.45 7.94 14.29 12.70 5.23 1.6
R41 180.98 11.11 17.46 15.88 7.75 1.6
R42 190.50 19.05 25.40 23.81 12.32 1.6
R43 193.68 7.94 14.29 12.70 5.23 1.6
R44 193.68 11.11 17.46 15.88 7.75 1.6
R45 211.12 11.11 17.46 15.88 7.75 1.6
(Continued) (mm)
Ring No. R Pitch diameter P Ring width A Ring height of the octagonal gasket H Ring plane width C
Radius of rounded
angle r
R93 749.30 19.50 23.90 12.32 1.6
R94 800.10 19.50 23.90 12.32 1.6
R95 857.25 19.50 23.90 12.32 1.6
R96 914.40 22.22 26.90 14.81 1.6
R97 965.20 22.22 26.90 14.81 1.6
R98 1022.35 28.58 26.90 14.81 2.4
R100 749.30 31.75 35.10 19.81 2.4
R101 800.10 31.75 38.10 22.33 2.4
R102 857.25 31.75 38.10 22.33 2.4
R103 914.40 31.75 38.10 22.33 2.4
R104 965.20 34.92 41.10 24.82 2.4
R105 1022.35 34.92 41.10 24.82 2.4
Note. R93 - R105 are only applicable to HG/T 20623A designated flange.
5. Technical requirements
5.1 Appearance
There shall not be such defects as scratch, pit and cracks which impact the sealing
property of the metal ring joint gaskets. Surface roughness of the sealing surface. Ra≤1.6μm.
5.2 Dimension tolerance
Dimension tolerance of metal ring joint gaskets shall meet the requirements of Table 5.2.
Table 5.2 Dimension Tolerance of the Metal Ring Joint Gaskets (mm)
Item Dimension tolerance
P ±0.18
A ±0.20
B or H ±0.50
C ±0.20
r ±0.5
23° ±0.5°
5.3 Manufacture
5.3.1 Metal ring joint gaskets usually are made integrally of steel bar, seamless tube and
forging. If other materials are adopted, it shall be agreed with the users.
5.3.2 Pony-size ring gasket may be made directly by the steel bar and seamless tube though
mechanical processing; while the lager size ring gasket usually is made into integral circle
which is formed by the forging through heat treatment and mechanical processing.
5.3.3 As for the metal ring joint gaskets that the materials (pure iron, 10 steel and 1Cr5M0)
which are easy to rusty are adopted, the surface shall be coated with antirust after inspection.
Anti-corrosive treatment shall be carried out for stainless steel ring joint gasket according to
the users' requirements.
5.4 Inspection
5.4.1 Appearance and Dimensional Gauging
Before ex-works, the appearance of the ring joint gasket shall be inspected visually.
Visual method shall be adopted for the surface roughness; and it shall be compared with
standard specimen (GB/T 6060.2). The special measuring device shall be adopted for the
inspection of the pitch diameter, ring width and ring height and angle and plane width of the
octagonal gasket; and it shall meet the requirements of Table 5.2.
5.4.2 Material Inspection
Chemical composition of the metal ring joint gaskets shall meet the relevant
requirements of Table 3.3.1. Allowable deviation of the product analysis and specified value
shall meet the requirements of GB/T 222.
5.4.3 Hardness Inspection
1 Brinell hardness method shall be adopted for the random inspection of the blank
hardness; and it shall meet the requirements of Table 3.3.1.
2 Rockwell hardness method shall be adopted for the random inspection of the product
hardness. Two parts shall be inspected symmetrically below R23. four parts shall be inspected
symmetrically over R24. Th...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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