HG/T 20615-2009 English PDF (HGT20615-2009)

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HG/T 20615-2009: Steel pipe flanges (Class designated)
HG/T 20615-2009
Chemical Industry Standard
of the People's Republic of China
HG
Replacing HG 20615~20622-1997, HG 20624~20626-1997
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 China
[Including Corrigendum/Modification confirmed in May 2012. Text in RED]
Table of Contents
1. General provisions ... 3 
2. Normative references ... 3 
3. Flange style and flange sealing surface ... 5 
3.1 Flange type ... 5 
3.2 Flange sealing face ... 9 
4. Materials... 17 
5. Gaskets and bolting for flange ... 19 
6. Fitting of flange joint ... 19 
7. Pressure-temperature rating ... 19 
8. Dimensions ... 35 
8.1 Coupling dimension of the pipe flange ... 35 
8.2 Physical dimension of the pipe flange ... 38 
8.3 Pipe flange neck ... 81 
8.4 Pipe thread ... 82 
9. Welding joint and groove dimension ... 82 
10. Dimension tolerance ... 84 
11. Test ... 86 
12. Inspection and acceptance ... 86 
13. Markings and illustrations ... 86 
14. Packaging and steel seal labeling ... 88 
Appendix A (Normative) Steel Orifice Flange ... 90 
Appendix B (Informative) Steel Jacket Flange ... 100 
Appendix C (Informative) Inside Diameter of the Weld Neck Pipe Flange ... 110 
Appendix D (Informative) Assorted Pipe Flanges' Standard ... 111 
Appendix E (Informative) Approximate Mass of the Pipe Flanges ... 112 
Appendix F (Informative) Approximate Distance between the Ring Joint Face Flanges
... 118 
1. General provisions
1.0.1 This national standard specifies the basic technical requirements of steel pipe flanges
(Class designated), including nominal dimension, nominal pressure, material,
pressure-temperature rating, flange type, dimension, sealing face, tolerance and marking.
1.0.2 This Standard is applicable to steel pipe flange and blind flange with nominal pressure
of Classl50 (PN20)~Class2500 (PN420). The nominal pressure grade of the flange is denoted
by Class, including the following six grades. Classl50, Class300, Class600, Class900,
Classl500 and Class2500.
Table 1.0.2 -- Nominal Pressure Grade Synopses of Flange
Class PN Class PN
Classl50 PN20 Class900 PN150
Class300 PN50 Class1500 PN260
Class600 PN110 Class2500 PN420
1.0.3 The applied nominal dimension DN and outside diameter of the steel pipe in this
Standard are in accordance with those specified in Table 1.0.3.
Table 1.0.3 -- Nominal Dimension and Outside Diameter of the Steel Pipe (mm)
Nominal dimension
DN 15 20 25 32 40 50 65 80 100
NPS 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4
Outside diameter of the steel pipe 21.3 26.9 33.7 42.4 48.3 60.3 76.1 88.9 114.3
Nominal dimension
DN 125 150 200 250 300 350 400 450 500 600
NPS 5 6 8 10 12 14 16 18 20 24
Outside diameter of the steel pipe 139.7 168.3 219.1 273.0 323.9 355.6 406.4 457 508 610
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 type of attachment.
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
"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 12228
"General Purpose Industrial Valves-Specification of Carbon Steel Castings" GB/T 12229
"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 (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
"Nondestructive Testing of Pressure Vessels" JB/T 4730
"Specification for Steel Casting for Power Station Valves" JB/T 5263
"Technical Specification for Low Temperature Service Steel Casting for Valves" JB/T
Appendix B of this Standard.
3.1.4 The nominal dimension and nominal pressure applied for flange types are in accordance
with those specified in Table 3.1.4.
Table 3.1.4 -- Pipe Flange Type and Application Scope
Flange
type Slip on neck flange (SO)
Weld neck flange (WN) and long
welding neck flange (LWN) Integral type flange(IF)
Nominal
dimension Nominal pressure Class (PN)
DN NPS
(20
(50
(110
(150
(260
(20
(50
(110
(150
(260
(420
(20
(50
(110
(150
(260
(420
15 21 × × × × × × × × × × × × × × × × ×
20 43 s × × × × × × × × × × × × × × × × ×
25 1 × × × × × × × × × × × × × × × × ×
32 411 × × × × × × × × × × × × × × × × ×
40 211 × × × × × × × × × × × × × × × × ×
50 2 × × × × × × × × × × × × × × × × ×
× × × × × × × × × × × × × × × × ×
80 3 × × × × — × × × × × × × × × × × ×
0 4 × × × × — × × × × × × × × × × × ×
5 5 × × × × — × × × × × × × × × × × ×
0 6 × × × × — × × × × × × × × × × × ×
0 8 × × × × — × × × × × × × × × × × ×
0 10 × × × × — × × × × × × × × × × × ×
0 12 × × × × — × × × × × × × × × × × ×
0 14 × × × × — × × × × × × × × × × —
0 16 × × × × — × × × × × × × × × × —
Table 3.1.4 (Continued)
Flange type Socket welding flange (SW)
Thread
flange
(Th)
Butt weldi...