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HG/T 20592-2009 (HGT 20592-2009)

Chinese Standard: 'HG/T 20592-2009'
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Standard ID HG/T 20592-2009 (HG/T20592-2009)
Description (Translated English) 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 115,140
Date of Issue 2009-02-05
Date of Implementation 2009-07-01
Older Standard (superseded by this standard) HG 20592-1997; HG 20593-1997; HG 20594-1997; HG 20595-1997; HG 20596-1997; HG 20597-1997; HG 20598-1997; HG 20599-1997; HG 20600-1997; HG 20601-1997; HG 20602-1997; HG 20603-1997; HG 20604-1997; HG 20605-1997
Quoted Standard GB/T 1047; GB/T 1048; GB 150; GB/T 152.1; GB/T 152.2; GB/T 152.3; GB/T 152.4; GB/T 700; GB/T 711; GB 713; GB/T 3274; GB 3531; GB/T 4237; GB/T 7306.2; GB/T 12228; GB/T 12229; GB/T 12230; GB/T 12716; GB/T 16253; HG/T 20553; HG/T 20606; HG/T 20607; HG/T 20609; HG/T 20610; HG/T 20611; HG/T 20612; HG/T 20613; HG/T 20614; JB/T 4709; JB 4726; JB 4727; JB 4728; JB/T 4730; JB/T 5263; JB/T 7248
Administrative Organization National Chemical Equipment Design Technology Center station
Regulation (derived from) Engineering [ 2009 ] No. 27
Summary This standard specifies the steel pipe flanges (PN series) of the basic technical requirements, including the nominal size, nominal pressure, the material, the pressure temperature rating, flange type and size, sealing surfaces, tolerances and markings. This standard applies to nominal PN2. 5-PN160 steel pipe flanges and flanged lid, flange PN nominal pressure rating used that includes the following nine grades: PN2. 5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, nominal size and pipe diameter this standard applies to the pipe diameter, including a, B two series, A series of international standard series (commonly known as BSP), B series follows the series for the domestic (commonly known as the metric pipe), its nominal size DN and pipe diameter specified in Table 1. 0. 3, using B series steel flanges, should the value of nominal size DN mark after "B" to show the difference, but with the Series A pipe flange, do not have the value of nominal size DN mark after "A", see Chapter 13 of this standard, Chapter 14, this standard also applies to use as a connecting flange types of valves, pumps, chemical machinery, piping accessories and equipment Parts, this standard does not include special fluid conditions from material selection principles.

HG/T 20592-2009
Chemical Industry Standard
of the People's Republic of China
Replacing HG 20592~20605-1997
Stee1 Pipe F1anges
(PN designated)
(PN 系列)
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China
1. General provisions ... 4 
2. Normative references ... 5 
3. Flange type and flange seal contact face ... 6 
3.1 Flange type ... 6 
3.2 Flange seal contact face ... 11 
4. Materials... 18 
5. Gaskets and bolting for flange ... 22 
6. Fitting of flange joint ... 22 
7. Pressure-temperature rating ... 22 
8. Dimensions ... 33 
8.1 Flanged coupling dimension ... 33 
8.2 Physical dimension of the flange ... 36 
8.3 Flange neck ... 102 
8.4 Pipe thread ... 103 
9. Welding joint and groove dimension ... 103 
9.1 Plate-type flat welding flange and flat welding ring loose flange ... 103 
9.2 Slip on neck flange ... 105 
9.3 Welding joint of the socket welding flange connecting to the steel pipe ... 107 
9.4 Weld neck flange ... 108 
9.5 Butt welding ring ... 108 
10. Dimension tolerance ... 109 
11. Test ... 112 
12. Inspection and acceptance ... 113 
13. Marking and marking illustration ... 113 
14. Packaging and steel seal label ... 115 
Appendix A (Normative) Steel Orifice Flange ... 117 
Appendix B (Informative) Steel Jacket Flange ... 131 
Appendix C (Informative) Assorted Pipe Flanges' Standard ... 143 
Illustration 2. nominal dimension DN300×400, nominal pressure PN25, male face slip
on neck steel jacket flange assorted with English system pipe, material is 20 steel, it is
marked as. Appendix D (Informative) Approximate Mass of the Flange ... 143 
Appendix E (Informative) Approximate Distance between Ring Joint Face Flanges
... 152 
1. General provisions
1.0.1 This national standard specifies the basic technical requirements of steel pipe
flanges (PN designated), including nominal dimension, nominal pressure, material,
pressure-temperature rating, flange type, dimension, seal contact face, tolerance and
1.0.2 This Standard is applicable to steel pipe flanges and blind flanges in nominal
pressure of PN2.5~PN160. The nominal flange pressure grades are denoted by PN,
including the following nine grades. PN2.5, PN6, PN10, PN16, PN25, PN40, PN63,
PN100 and PN160.
1.0.3 Nominal dimension and outside diameter of the steel pipe
Outside diameter of the steel pipe applicable to this Standard includes two series. A
and B, where A designs for the international purposes (it is commonly referred to as
"John Guest"), while B designs for the domestic adopting series (it is commonly referred
to as "metric pipe"). Its nominal dimension DN and outside diameter of the steel pipe are
in accordance with those specified in Table 1.0.3.
The flanges adopting B series steel pipe shall be marked with "B" at the back of the
number of nominal dimension DN for differentiation. However, the flange adopting A
series steel pipe must not be marked with "A" at the back of the number of nominal
dimension DN, for more details, see Chapter 13 and Chapter 14 of this Standard.
Table 1.0.3 Nominal Dimension and Outside Diameter of the Steel Pipe (mm)
Nominal dimension DN 10 15 20 25 32 40 50 65 80
Outside diameter of the steel pipe
A 17.2 21.3 26.9 33.7 42.4 48.3 60.3 76.1 88.9
B 14 18 25 32 38 45 57 76 89
Nominal dimension DN 100 125 150 200 250 300 350 400 450 500
Outside diameter of the steel pipe
A 114.3 139.7 168.3 219.1 273 323.9 355.6 406.4 457 508
B 108 133 159 219 273 325 377 426 480 530
Nominal dimension DN 600 700 800 900 1000 1200 1400 1600 1800 2000
Outside diameter of the steel pipe
A 610 711 813 914 1016 1219 1422 1626 1829 2032
B 630 720 820 920 1020 1220 1420 1620 1820 2020
1.0.4 This Standard is also applicable to valve, pump, chemical engineering machinery,
pipeline fittings and equipment spares with flange being used as its coupling mode.
1.0.5 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.
"Pipework Components--Definition and Selection of DN (Nominal Dimension)"
GB/T 1047
"Pipework Components--Definition and Selection of PN (Nominal Pressure)" GB/T
"Steel Pressure Vessels" GB 150
"Fasteners-Clearance Holes and Counterbores" GB/T 152.1~152.4
"Carbon Structural Steels" GB/T 700
"Hot-rolled Quality Carbon Structural Steel Plates and Wide Strips" GB/T 711
"Steel Plates for Boiler and Pressure Vessels" GB 713
"Hot-rolled Plates and Strips of Carbon Structural Steels and High Strength Low
Alloy Structural Steels" GB/T 3274
"Low Alloy Steel Plates for Low Temperature Pressure Vessels" GB 3531
"Hot Rolled Stainless Steel Plate Sheet and Strip" GB/T 4237
"Pipe Threads with 55 Degree Thread Angle where Pressure-tight Joints are Made
on the Threads--Part 2. Taper Internal and External Threads" GB/T 7306.2
"General Purpose Industrial Valves-Specification of Carbon Steel Forgings" GB/T
"General Purpose Industrial Valves-Specification of Carbon Steel Castings" GB/T
"General Purpose Industrial Valve——Specification of Stainless Steel Castings"
GB/T 12230
"Pipe Threads with the Thread Angle of 60 Degrees where Pressure-tight Joints are
made on the Threads" GB/T 12716
"Steel Castings for Pressure Purposes" GB/T 16253
"Dimension Selection Series of Seamless and Welded Steel Pipe for Chemical
Industry Piping" HG/T 20553
"Non-metallic Flat Gaskets for use with Steel Pipe Flanges (PN designated)" HG/T
"PTFE Envelope Gaskets for use with Steel Pipe Flanges (PN designated)" HG/T
"Metal Jacketed Gaskets for use with Steel Pipe Flanges (PN designated)" HG/T
"Spiral Wound Gaskets for use with Steel Pipe Flanges (PN designated)" HG/T
Table 3.1.4 (Continued)
Flange type Butt welding ring loose flange (PJ/SE)
Flat welding
ring loose
flange (PJ/PR)
Blind flange (BL) Lining blind flange (BL)
Applicable outside
diameter series of
the steel pipe
A and B A and B A and B are identical A and B are identical
dimension Nominal pressure PN
pressure PN Nominal pressure PN
Nominal pressure
DN 6 10 16 25 40 6 10 16 2.5 6 10 16 25 40 63......
Related standard: HG/T 20606-2009    HG/T 20607-2009
Related PDF sample: GB/T 12385-2008    GB/T 17241.6-2008