HG/T 20623-2009 (HG/T20623-2009, HGT 20623-2009, HGT20623-2009) & related versions
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Large diameter steel pipe flanges (PN designated)
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HG/T 20623-2009
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HGT 20623-2009
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HG/T 20623-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20623-1997
Large Diameter 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. General provisions ... 3
2. Normative references ... 3
3. Type and seal contact face of the flanges ... 4
3.1 Flange type ... 4
3.2 Seal contact face of the flanges ... 5
4. Materials... 9
5. Maximum allowable working pressure ... 9
6. Thickness of the straight flange ... 10
7. Dimension ... 10
8. Flange joint... 17
9. Welding joint and groove dimension ... 18
10. Dimension tolerance ... 19
11. Test ... 20
12. Inspection and acceptance ... 21
13. Markings and illustrations ... 21
14. Packaging and steel seal labeling ... 22
Appendix A (Informative) Approximate Mass of Larger Diameter Pipe Flanges ... 23
Appendix B (Informative) Assorted Pipe Flanges' Standard ... 25
1. General provisions
1.0.1 This national standard specifies nominal dimension, nominal pressure, material,
pressure-temperature rating, flange type, dimension, seal contact face, tolerance and marking
of larger diameter steel pipe flanges (Class designated).
1.0.2 This Standard is applicable to larger diameter weld neck steel pipe flanges and blind
flanges with nominal pressure of Classl50 (PN20)~Class900 (PN150). The nominal pressure
grade of the flange is denoted by Class, including the following four grades. Classl50,
Class300, Class600 and Class900.
1.0.3 This Standard includes A and B two dimensions series of larger diameter steel pipe
flange, and clear marking must be indicated when being adopted.
1.0.4 The applied nominal dimension DN and outside diameter of the steel pipe in this
Standard are in accordance with those specified in Table 1.0.4.
Table 1.0.4 Inside Nominal Diameter and Outside Diameter of the Steel Pipe
Nominal dimension
DN 650 700 750 800 850 900 950 1000
NPS 26 28 30 32 34 36 38 40
Outside diameter of the steel pipe (mm) 660 711 762 813 864 914 965 1016
Nominal dimension
DN 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500
NPS 42 44 46 484 50 52 54 56 58 60
Outside diameter of the steel pipe (mm) 1067 1118 1168 1219 1270 1321 1372 1422 1473 1524
1.0.5 This Standard is also applicable to valve, pump, chemical engineering machinery,
pipeline fittings and equipment spares with flanges being used as type of attachment.
1.0.6 This Standard excludes selection principle for materials under particular fluid operating
conditions.
2. Normative references
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. For dated reference, subsequent amendments
(excluding content of corrigenda) to, or revisions of, any of these publications do not apply.
However, Parties to agreements based on this Code are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. For undated
references, the latest edition of the normative document referred to applies.
"Fasteners-Counterbores for Hexagon Bolts and Nuts" GB/T 152.4
"Steel Pipe Flanges (Class Designated)" HG/T 20615
"Non-metallic Flat Gaskets for use with Steel Pipe Flanges (Class designated)" HG/T
"PTFE Envelope Gaskets for use with Steel Pipe Flanges (Class designated)" HG/T
"Metal Jacketed Gaskets for use with Steel Pipe Flanges (Class Designated)" HG/T
"Spiral Wound Gaskets for use with Steel Pipe Flanges (Class Designated)" HG/T 20631
"Covered Serrated Metal Gaskets for use with Steel Pipe Flanges (Class Designated)"
HG/T 20632
"Metallic Ring Joint Gaskets for use with Steel Pipe Flanges (Class Designated)" HG/T
"Bolting for use with Steel Pipe Flanges (Class Designated)" HG/T 20634
"Specification for Selection of Steel Pipe Flanges, Gaskets and Bolting (Class
designated)" HG/T 20635
"Carbon and Low-alloy Steel Forgings for Pressure Vessels" JB 4726
"Low-alloy Steel Forgings for Low Temperature Pressure Vessels" JB 4727
"Stainless Steel Forgings for Pressure Vessels" JB 4728
3. Type and seal contact face of the flanges
3.1 Flange type
The flange type or its applied nominal dimension and nominal pressure are in accordance
with those specified in Table 3.1.
Table 3.2.7-3 Dimension of Ring Joint Face (mm)
Nominal
dimension Class300(PN50) Class600(PN110) Class900(PNl50)
DN NPS Ring No. dmin P E F Rmax Ring No. dmin P E F Rmax
650 26 R93 810 749.30 12.70 19.84 1.5 R100 832 749.30 17.48 30.18 2.3
700 28 R94 861 800.10 12.70 19.84 1.5 R101 889 800.10 17.48 33.32 2.3
750 30 R95 917 857.25 12.70 19.84 1.5 R102 946 857.25 17.48 33.32 2.3
800 32 R96 984 914.40 14.27 23.01 1.5 R103 1003 914.40 17.48 33.32 2.3
850 34 R97 1035 965.20 14.27 23.01 1.5 R104 1067 965.20 20.62 36.53 2.3
900 36 R98 1092 1022.35 14.27 23.01 1.5 R105 1124 1022.35 20.62 36.53 2.3
4. Materials
4.0.1 The materials for steel pipe flanges comply with the requirements of Table 4.0.1 of
HG/T 20615, whose chemical composition, mechanical property and other technical
requirements shall be in accordance with the standards provisions listed in Table 4.0.1.
4.0.2 The grades and technical requirements of the forgings for use with pipe flanges
(including forging rolling pieces) (refer to JB 4726, JB 4727 and JB 4728) shall be in
accordance with the following requirements.
1 The one with one of the following qualifications shall comply with the requirements of
III-level or above forgings;
1) Forgings with nominal pressure of more than or equal to Class600;
2) Chrome molybdenum steel forgings with nominal pressure of greater than or
equal to Class300;
3) Ferrite steel forging with nominal pressure of greater than or equal to Class300
and with working temperature of less than or equal to -20℃.
2 Unless otherwise specified in Item 1 above, the forgings with nominal pressure of less
than or equal to Class300 shall comply with the requirements of II-level or above forging,
4.0.3 The flanges (excluding blind flanges) shall be made of forgings (or forging rolling
technology) or castings (steel), but shall not be tailor-welding. The blind flanges may be made
of steel plate.
4.0.4 Unless otherwise specified in this Standard, the materials for pipe flange shall also
comply with the requirements of relevant standards and codes.
5. Maximum allowable working pressure
The maximum allowable working pressure of the flanges under working temperature
complies with the requirements of Chapter 7 of HG/T 20615.
Table 7.0.1-1 Class1500 (PN20) Larger Diameter Steel Pipe Flange and Blind Flange (A series) (mm)
Nominal
dimension Outside
diameter
A of the
flange
welding
end
Coupling dimension Thickness
Inside
diameter
of the
flange
Flange
neck
Flange
height
H DN NPS
Outside
diameter
of the
flange
Diameter
of the
bolt hole
center
circle
Diameter
of bolt
hole
Bolt
Th
Quantity
of the
bolt
hole
Flange
Blind
flange
N R
650 26 660.4 870 806.4 36 M33 24 66.7 66.7
Conform
to the
inside
diameter
of the
steel pipe
700 28 711.2 925 863.6 36 M33 28 69.9 69.9 727 11 124
750 30 762.0 985 914.4 36 M33 28 73.1 73.1 781 11 135
800 32 812.8 1060 977.9 42 M39 28 79.4 79.4 832 11 143
850 34 863.6 1110 1028.7 42 M39 32 81.0 81.0 883 13 148
900 36 914.4 1170 1085.8 42 M39 32 88.9 88.9 933 13 156
950 38 965.2 1240 1149.4 42 M39 32 85.8 85.8 991 13 156
1000 40 1016.0 1290 1200.2 42 M39 36 88.9 88.9 1041 13 162
1050 42 1066.8 1345 1257.3 42 M39 36 95.3 95.3 1092 13 170
1100 44 1117.6 1405 1314.4 42 M39 40 100.1 100.1 1143 13 176
1150 46 1168.4 1455 1365.2 42 M39 40 101.6 101.6 1197 13 184
1200 48 1219.2 1510 1422.4 42 M39 44 106.4 106.4 1248 13 191
1250 50 1270.0 1570 1479.6 48 M45 44 109.6 109.6 1302 13 202
1300 52 1320.8 1625 1536.7 48 M45 44 114.3 114.3 1353 13 208
1350 54 1371.6 1685 1593.8 48 M45 44 119.1 119.1 1403 13 214
1400 56 1422.4 1745 1651.0 48 M45 48 122.3 122.3 1457 13 227
1450 58 1473.2 1805 1708.2 48 M45 48 127.0 127.0 1508 13 233
1500 60 1524.0 1855 1759.0 48 M45 52 130.2 130.2 1559 13 238
Note. The inside diameter B of the flange is determined by the wall thi...
......
| Standard ID | HG/T 20623-2009 (HG/T20623-2009) | | Description (Translated English) | Large diameter steel pipe flanges (PN designated) | | Sector / Industry | Chemical Industry Industry Standard (Recommended) | | Classification of Chinese Standard | J15 | | Classification of International Standard | 23.040.60 | | Word Count Estimation | 54,538 | | Date of Issue | 2009-02-05 | | Date of Implementation | 2009-07-01 | | Older Standard (superseded by this standard) | HG 20623-1997 | | Quoted Standard | JB 4728; JB 4726; GB/T 152.4; HG/T 20615; HG/T 20627; HG/T 20628; HG/T 20630; HG/T 20631; HG/T 20632; HG/T 20633; HG/T 20634; HG/T 20635; JB 4727 | | Administrative Organization | National Chemical Equipment Design Technology Center station | | Regulation (derived from) | Engineering [ 2009 ] No. 27 | | Summary | This standard specifies the large diameter steel pipe flanges (Class Series) nominal size, nominal pressure, the material, the pressure temperature rating, flange type and size, sealing surfaces, tolerances and markings. This standard applies to nominal Class150 (PN20) to ~ Class900 (PN150) large-diameter welded steel pipe flange with neck and flange cover. Nominal grade flange using Clas said, including the following four levels: Class150, Class300, Class600, Class900. This standard covers both A and B size series of large diameter steel pipe flanges, the choice must be clearly marked. This standard applies to the nominal size of the pipe and the pipe diameter DN requirements in Table 1. 0. 4. This standard also applies to the use of flange connection form as valves, pumps, chemical machinery, piping accessories and equipment components. This standard does not include special fluid conditions from material selection principles. | | Standard ID | HG 20623-1997 (HG20623-1997) | | Description (Translated English) | (Large-diameter steel pipe flanges (American System)) | | Sector / Industry | Chemical Industry Industry Standard | | Classification of Chinese Standard | J15 | | Classification of International Standard | 23.040.60 | | Word Count Estimation | 32,390 | | Date of Issue | 1997/11/27 | | Date of Implementation | 1998/2/1 | | Older Standard (superseded by this standard) | HGJ 44��76-1991 | | Adopted Standard | ANSI B16.47B, MOD | | Regulation (derived from) | Chemical Industry National Standard, Industry Standard and the International Standard Catalog 2006; Industry-Science [2009] No. 27 |
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