HG/T 20592-2009 PDF English
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[Including Corrigendum/Modification 2012] Steel pipe flanges (PN designated)
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HG/T 20592-2009: [Including Corrigendum/Modification 2012] Steel pipe flanges (PN designated)---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT20592-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20592~20605-1997
Stee1 Pipe F1anges
(PN designated)
(PN ϵ��)
[Including Corrigendum/Modification confirmed in May 2012.Text in RED]
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
Table of Contents
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... 100
8.4 Pipe thread... 101
9.Welding joint and groove dimension... 101
9.1 Plate-type flat welding flange and flat welding ring loose flange... 101
9.2 Slip on neck flange... 103
9.3 Welding joint of the socket welding flange connecting to the steel pipe... 105
9.4 Weld neck flange... 106
9.5 Butt welding ring... 106
10.Dimension tolerance... 107
11.Test... 110
12.Inspection and acceptance... 111
13.Marking and marking illustration... 111
14.Packaging and steel seal label... 113
Appendix A (Normative) Steel Orifice Flange... 115
Appendix B (Informative) Steel Jacket Flange... 130
Appendix C (Informative) Assorted Pipe Flanges' Standard... 142
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... 142
Appendix E (Informative) Approximate Distance between Ring Joint Face Flanges
... 151
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
marking.
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)
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
3.Flange type and flange seal contact face
3.1 Flange type
3.1.1 The flange type and its code are in accordance with those specified in Figure 3.1.1
and Table 3.1.1.The flange type includes. plate-type flat welding flange (PL), slip-on
neck flange (SO), welding neck flange (WN), integral type flange, socket welding flange
(SW), thread flange (TH), butt welding ring loose flange (PJ/SE), flat welding ring loose
flange (PJ/PR), blind flange (BL) and lining blind flange (BL< S>).
3.1.2 The orifice flange for flow measurement complies with the provisions of Appendix
A of this Standard.
3.1.3 The jacket flange for full jacket pipeline may refer to the requirements of Appendix
B of this Standard.
3.1.4 Nominal dimension and nominal pressure applied for flange types are in
accordance with those specified in Table 3.1.4.
3.1.5 Plate-type Flat Welding Flange (PL) Slip-on Neck Flange (SO) Weld Neck Flange (WN)
Socket Welding Flange (SW) Thread Flange (Th) Integral type flange (IF)
Butt Welding Ring Loose Flange (PJ/SE) Flat Welding Ring Loose Flange (PJ/PR)
Lining Blind Flange (BL< S>) Blind Flange (BL)
4.Materials
4.0.1 Materials for steel pipe flange comply with the requirements of Table 4.0.1, its
chemical composition, mechanical property and other technical requirement shall be in
accordance with the standards provisions listed in Table 4.0.1.
4.0.2 The grades and technical requirements of the forging for pipe flange (including forging
rolling piece) (refer to JB 4726, JB 4727 and JB 4728) shall be in accordance with the
following requirements.
4.0.3 Neck flange shall be made of forging (or forging rolling technology) and casting (steel)
piece, but shall not be made by such technologies ad steel plate, tailor-welding or coiled sheet.
The plate-type ring flange like blind flange may be made of steel plate. or steel plate
tailor-welding, and it shall meet the following requirement.
4.0.4 Stainless steel lining blind flange (BL< S>)
1 The backing layer and blind flange shall be compacted tightly and welding
according to the requirements of Figure 4.0.4 and JB/T 4709.The welding material on
the fillet weld and plug welding hole bottom layer is adopted according to transition
layer welding rod, while the facing welding material is adopted according to welding rod
on the capping layer. The plug welding is in accordance with those specified in Table
4.0.5 Unless otherwise specified in this Standard, the materials for pipe flange shall also
comply with the requirements of relevant standards and codes.
5.Gaskets and bolting for flange
5.0.1 The gasket shall comply with the sealing property of flange joint under working
conditions. Acting by pretension load of bolt, gasket stress under pretension and working
conditions shall be ensured, and no deleterious deformation or crush can be generated.
5.0.2 The gasket complies with the requirements of HG/T 20606~HG/T 20612.
5.0.3 The bolting includes hex bolt, double end studs (tamping type), full thread stud and nut,
the applied bolt quantity and specification are in accordance with the requirements of Table
8.1.1 shown in this Standard.
5.0.5 The bolting complies with the requirements of HG/T 20613.
6.Fitting of flange joint
The fitting between the flange and gasket or bolting complies with the requirements
of HG/T 20614.
7.Pressure-temperature rating
7.0.1 For the steel pipe flange and blind flange with nominal pressure grade of PN2.5~PN160,
the maximum allowable working pressure under working temperature complies with the
requirements of Table 7.0.1-1~Table 7.0.1-9.The medium temperature may be determined by
interpolation method.
7.0.2 The sorts of pipe flange materials listed in Table 7.0.1-1~Table 7.0.1-9 comply with the
requirements of Table 4.0.1 of this Standard.
7.0.3 The maximum allowable working pressure under nominal pressure and different
temperatures of lining blind flange is determined according to its material sorts. While the
upper limit for the service temperature of the stainless steel lining blind flange is no greater
than 350��.
7.0.6 When determining the pressure-temperature rating of flange joint, it shall consider the
impact of external force and external force moment in the piping system under high
temperature or low temperature on the sealing property of the flange joint.
7.0.7 The flange joint in the elevated temperature creep scope or that bear larger temperature
gradient shall prevent bolt looseness by measures, such as regular tightening. The materials
shall be ensured with adequate tenacity under low-temperature operating conditions.
7.0.8 When the materials not listed in Table 4.0.1 of this Standard are adopted, the maximum
allowable working pressure of the flange may be determined according to the equivalent
principle of material mechanical strength (room temperature/high temperature) on the basis of
the materials listed in the Table, but it shall not be more than the amount of corresponding
materials listed in the table.
8.Dimensions
8.1 Flanged coupling dimension
8.1.1 The coupling dimension of the flange complies with the requirements of Figure 8.1.1
and Table 8.1.1 (they are flanges have their different pressure grades within mourning border
of table 8.1.1, but they are equipped with same coupling dimension). The domestic and
international flanges standards assorted with this Standard may refer to Appendix C of this
Standard.
8.1.2 The bolt holes shall be evenly distributed.
8.2 Physical dimension of the flange
8.2.1 The dimension of plate-type sub-welding flange complies with the requirements of
Figure 8.2.1 and Table 8.2.1-1~Table 8.2.1-6.
8.3 Flange neck
8.3.1 The outer flank slope for the neck of the slip on neck flange, socket welding flange and
thread flange shall be no greater than 7��.
8.3.2 The taper neck slope of the weld neck flange shall be no greater than 45��, and it shall
also be provided with straight section in slope of no greater than 7��; the sealing end complies
with the requirements of Chapter 9 of this Standard.
8.3.3 The neck thickness S of the weld neck flange is generally no less than the nominal
thickness of the steel pipe, of which shall be indicated by the user when ordering. S values
listed in this Standard are only applicable to the occasions that users are not proposing
specific requirements.
8.3.4 The butt welding ring wall thickness S of the butt welding ring loose flange is generally
no less than the nominal thickness of the steel pipe, which shall be indicated by the user when
ordering. Flanging thickness S1 of the butt welding ring shall be no less than the minimum
wall thickness of the steel pipe (0.875S).
8.4 Pipe thread
8.4.1 The thread flange specified in this Standard is only applicable to outside diameter A
series steel pipe.
8.4.2 The pipe thread adopted for the thread flange is classified into three occasions.
8.4.3 When adopting 55��pipe thread, outside diameter of the steel pipe for DN150 shall be
165.1mm. When adopting 60�� taper thread, outside diameter of the steel pipe for DN65 flange
shall be 73mm and outside diameter of the steel pipe for DN125 flange shall be 141.3mm.
8.4.4 The processing of inner bore pipe thread of the thread flange shall make the ends of the
steel pipe approach each other but not exceed the flange seal contact face after screwing in.
9.Welding joint and groove dimension
9.1 Plate-type flat welding flange and flat welding ring loose flange
9.1.1 The welding joint of plate-type flat welding flange and flat welding ring connecting to
the steel pipe in the scope shown in Table 9.1.1 shall comply with the requirements of Figure
9.1.1.
9.1.2 The welding joint and groove dimension of plate-type flat welding flange and flat
welding ring connecting to the steel pipe shown in Table 9.1.2-1 shall comply with the
requirements of Figure 9.1.2 and Table 9.1.2-2.
9.2 Slip on neck flange
9.2.1 The welding joint of slip on neck flange connecting to the steel pipe in the scope shown
in Table 9.2.1 shall comply with the requirements of Figure 9.2.1.
9.2.2 Table 9.2.2-1 welding joint and groove dimension of the slip on neck flange connecting
to the steel pipe shown in the scope of Table 9.2.2-1 shall comply with the requirements of
Figure 9.2.2 and Table 9.2.2-2.
9.3 Welding joint of the socket welding flange connecting to the steel pipe
Welding joint of the socket welding flange connecting to the steel pipe shall comply with
the requirements of Figure 9.3.
9.4 Weld neck flange
9.4.1 Welding joint and groove dimension of the weld neck flange connecting to the steel pipe
shall comply with the requirements of Figure 9.4 (a).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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