Some standard content:
Industry Standard of the People's Republic of China
JB/T4700~4707—2000
Flanges for pressure vessels
2000-04-24 Issued
State Bureau of Machinery Industry
State Bureau of Petroleum and Chemical Industry
2000-09-30 Implementation
May be announced
JB/T4700~4707—2000
JB/T4700—2000
JB/T47012000
JB/T4702—2000
JB/T4703—2000
JB/T 47042000
JB/T4705—2000
JB/T4706—2000
JB/T 47072000
Classification and technical conditions of pressure vessel flanges
Type A slip-on flange
Type B slip-on flange
Long neck butt welding flange
Non-metallic soft gasket
Spiral wound gasket
Metal clad gasket
Equal length studs
JB/T4700~4707——2000 Revision Notes
JB/T4700~4707-2000
This standard revise JB4700~4707—1992.
This standard has made the following changes based on the feedback and suggestions since the implementation of JB4700~4707-1992: 1 The relationship between this standard and the flange design method in the steel pressure vessel standard CB150 has been clarified. 2 All referenced standards have been updated to the latest version. 3 The long neck butt welding flange standard has been improved: a) The applicable temperature range of the standard has been expanded to -70℃. Supplementary adjustments have been made to Table 2 (flange, gasket, stud, nut material matching table) and Table 7 (maximum allowable working pressure of long neck flange) in the standard;
b) Adapt to the use requirements of 3mm corrosion allowance for flange materials; In order to meet the needs of connecting with thinner round cylinders, Table 3 (long neck butt welding flange total height H correction table) has been added; c
The inspection requirements for the butt welds between long neck flanges and round cylinders have been modified. d)
Make the Type B flange meet the requirements of 3mm corrosion allowance. 4
Modify the impact energy requirements of stud materials.
6 It is allowed to modify the individual dimensions of standard flanges. 7 The structural dimensions of each standard gasket and the connection dimensions of each standard flange are not changed in the new standard. The dimensions of a few flanges are adjusted.
This standard replaces JB4700~4707-1992 from the date of implementation. This standard is proposed by the National Technical Committee for Standardization of Pressure Vessels, and is under the jurisdiction of the Design Subcommittee and the Manufacturing Subcommittee of the National Technical Committee for Standardization of Pressure Vessels.
The drafting units of this standard are: Sinopec Beijing Petrochemical Engineering Company, Hefei General Machinery Research Institute, Sinopec Beijing Design Institute, Sinopec Luoyang Petrochemical Engineering Company.
The main drafters of this standard are: Sang Rubao, Yao Zuoquan, Xu Xien, Feng Qingxiao, Huang Shaochen. The National Technical Committee for Standardization of Pressure Vessels is responsible for the interpretation of this standard. 1
1Scope
Industry Standard of the People's Republic of China
Classification and Technical Conditions of Pressure Vessel Flanges
Type and specification for pressure vessel flangesJB/T4700—2000
Replaces JB4700—1992
This standard specifies the classification and specifications of pressure vessel flanges, the materials of flanges, studs, nuts and the matching with gaskets, the maximum allowable working pressure at various temperatures, technical requirements and markings: This standard is applicable to carbon steel and low alloy steel pressure vessel flanges with nominal pressure of 0.25~6.40MPa and working temperature of -70~450℃. Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB150—1998
Steel Pressure Vessels
GB/T 539—1995
GB/T 6991999
GB/T700—1988
GB/T 18011999
GB/T 1804—1992
GB/T 3077—1999
Oil-resistant asbestos rubber sheet
High-quality carbon structural steel
Carbon structural steel
Limits and fits
Selection of tolerance zones and fits
Unspecified tolerances for linear dimensions
General tolerances
Alloy structural steel
GB/T 3098.2—1982
CB/T 3274—1988
GB/T 3985——1995
Mechanical properties of fasteners
Carbon structural steel and low alloy structural steel
Asbestos rubber sheet
GB/T5779.2—1986
GB 6654—1996
JB/T4701—2000
JB/T4702—2000
JB/T4703—2000
JB/T4704—2000
JB/T4705——2000
JB/T4706—2000
JB/T 4707—2000
JB4726—2000
JB4727—2000
JB 4730—1994
Surface defects of fasteners
Steel plates for pressure vessels
Type A flat welding flange
Type B flat welding flange
Long neck butt welding flange
Non-metallic soft seal
Wrapped gasket
Metal-clad gasket
Equal length studs
Hot-rolled thick steel plates and strips
General requirements
Carbon steel and low alloy steel forgings for pressure vessels Low temperature pressure vessels Nondestructive testing of pressure vessels made of carbon steel and low alloy steel forgings
National Bureau of Machinery Industry
National Bureau of Petroleum and Chemical Industry
Approved on April 24, 2000
Implementation on September 30, 2000
3 Selection principles and corrosion allowances applicable to standards JB/T4700-2000
3.1 Flanges of this standard should be used as the flanges of pressure vessels first. Flanges selected according to this standard can be exempted from the relevant calculations of GB150. 3.2 The applicable corrosion allowance of type B flanges in this standard is not more than 2mm. When the corrosion allowance exceeds 2mm but not more than 3mm, the thickness of the short section should be thickened by 2mm. The applicable corrosion allowance of long neck butt welding flanges is not more than 3mm. 4 Flange classification, material matching, working temperature and maximum allowable working pressure, structural dimensions 4.1 Flange classification and series parameters are specified in Table 1. 4.2 Matching of flange, gasket, stud and nut materials 4.2.1 The matching and operating temperature range of type A flat welding flange, type B flat welding flange and long neck butt welding flange (hereinafter referred to as type A, type B, long neck flange), gasket, stud and nut materials shall comply with the provisions of Table 2. 4.2.2 The hardness of the stud (Brinell hardness, HB) shall be 20~30 higher than that of the nut. The same strength level of materials can be achieved through different heat treatment states.
4.3 Working temperature, maximum allowable working pressure and structural dimensions of flanges 4.3.1 The working temperature of type A flange is higher than -20~300℃, and the working temperature of type B flange is higher than -20~350℃. The maximum allowable working pressure is shown in Table 6. The structural dimensions are in accordance with the provisions of JB/T4701 and JB/T4702 respectively. The operating temperature of type B flange with liner ring shall be determined by the designer according to the situation.
4.3.2 The working temperature of the long neck flange is -70~450℃, and its maximum allowable working pressure is specified in Table 7. The structural dimensions are in accordance with the provisions of JB/T4703. The operating temperature of the bushing flange is determined by the designer according to the actual situation. 4.3.3 When selecting a standard flange, the working temperature of the selected flange should not be lower than the design temperature of the flange under the service conditions; the maximum allowable working pressure of the flange should not be less than the calculated pressure of the flange under the service conditions. When the flange is subjected to axial tension or bending moment, its function should be considered separately.
4.4 Gasket
Gaskets are in accordance with the provisions of JB/T4704, JB/T4705, and JB/T4706.5 Studs and nuts
Studs shall comply with the provisions of JB/T4707.
Nuts shall comply with the provisions of GB/T3098.2, GB/T3077, CB/T5779.2. 5. Codes, markings and marking examples
5.1 Codes
Flange type codes shall comply with the provisions of Table 8. Sealing surface type codes shall comply with the provisions of Table 9. 4
Standard No.
Nominal pressure PN
Diameter DN
JB/T4701
JB/T4700—2000
Table 1 Flange classification and parameter table
Slip-on flange
JB/T4702
Butt-weld flange
JB/T4703
+ type flange
Type B flange and long neck flange
Applicable temperature
Range, ℃
G B/T539
Oil-resistant asbestos rubber
Metal soft gasket
GB/T3985
Asbestos rubber sheet
GB/T539
Oil-resistant asbestos rubber
GB/T3985
Asbestos rubber sheet
Asbestos or graphite
Filling tape
Polytetrafluoroethylene
Filling tape
Copper, aluminum cladding
Low carbon steel, stainless steel cladding
> - 20
> - 20
> - 20
JB/T4700—2000
Flange, gasket,
Plate GB/T3274
Q235-A, B, C
Match right column
Flange material
Plate GB6654
Plate GB/T3274
Match right column flange
Q235-A, B, C
GB6654
Forging JB4726
Plate GB6654
Forging JB4726
15CrMo
Forging JB4727
Select flange materials on the right
09MnNiD
Forging JB4726
12Cr2Mol
Forging JB4726
20MnMo
Stud,
Nut material matching table
Applicable temperature
Range, ℃
40~350
70 ~350
0 ~ 450
Optional right column stud nut material
According to Table 3
Select the right column
stud material
Then select the screw
nut material
According to Table 4
Select the right column
stud material
Then select the screw
nut material
Optional right
stud nut
According to Table 5
Select the right column
stud material
Then select the screw
nut material
stud material
GB/T 700
Q235-A
GB/T 699
GB/T3077
40MnVB
40MnVB
GB/T 3077
35CrMoA
40MnVB
35CrMoA
GB/T3077
25Cr2MoVA
25Cr2MoVA
35CrMoA
Studs and nuts
Nut materials
GB/T 700
Q235-A
GB/T 699
Q235 - A
GB/T3077
30CrMoA
35CrMoA
35, 45
45, 40Mn
30CrMoA
35CrMoA
30CrMoA
25Cr2MoVA
3dCrMoA
25C/2MoVA
30CrMoA
Applicable temperature
range, ℃
> - 20
20~ 400
70 ~ 450
Type B flange materials are selected according to the plates and forgings listed in the table, but Cr-Mo steel should not be used. The matching stud and nut materials shall be as specified in the table: 2 The long neck flange materials shall be selected according to the forgings in the table, and the matching stud and nut materials shall be as specified in the table 6
Nominal pressure PN
Nominal diameter
JB/T4700--2000
Stud material selection table
1) For 16Mn and 16MnR flange materials, when the working temperature is higher than 200℃, 40MnB should be selected instead. 2.50
40MnVB
Nominal pressure PN
Nominal diameter
40MnB)2)
40MnBl)-2
JB/T47002000
Table 4 Stud material selection table
40MnB\).2)
1) For 15CrMo flange material, when the working temperature is higher than 350℃, 40MnVB should be selected. 2.50
40MnVB2
35CrMoA
2) When the flange working temperature is higher than 400℃ or lower than or equal to -20℃, the stud material should be changed to 35CrMo.A. 8
40MnVB2)
35CrMoA
Nominal pressure PN
Nominal diameter
JB/T4700-2000
Table 5 Stud material selection table
40MnVBl
35CrMoA
1) When the flange operating temperature is higher than 400℃, the stud material should be changed to 35CrMoA. 2.50 | |tt | 5-A , B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
DN<14001 Code
Flange type code shall comply with the provisions of Table 8. Sealing surface type code shall comply with the provisions of Table 9. 4
Standard number
Nominal pressure PN
Diameter DN
JB/T4701
JB/T4700—2000
Table 1 Flange classification and parameter table
Slip-on flange
JB/T4702
Butt-weld flange
JB/T4703
+ type flange
Type B flange and long neck flange
Applicable temperature
Range, ℃
G B/T539
Oil-resistant asbestos rubber
Metal soft gasket
GB/T3985
Asbestos rubber sheet
GB/T539
Oil-resistant asbestos rubber
GB/T3985
Asbestos rubber sheet
Asbestos or graphite
Filling tape
Polytetrafluoroethylene
Filling tape
Copper, aluminum cladding
Low carbon steel, stainless steel cladding
> - 20
> - 20
> - 20
JB/T4700—2000
Flange, gasket,
Plate GB/T3274
Q235-A, B, C
Match right column
Flange material
Plate GB6654
Plate GB/T3274
Match right column flange
Q235-A, B, C
GB6654
Forging JB4726
Plate GB6654
Forging JB4726
15CrMo
Forging JB4727
Select flange materials on the right
09MnNiD
Forging JB4726
12Cr2Mol
Forging JB4726
20MnMo
Stud,
Nut material matching table
Applicable temperature
Range, ℃
40~350
70 ~350
0 ~ 450
Optional right column stud nut material
According to Table 3
Select the right column
stud material
Then select the screw
nut material
According to Table 4
Select the right column
stud material
Then select the screw
nut material
Optional right
stud nut
According to Table 5
Select the right column
stud material
Then select the screw
nut material
stud material
GB/T 700
Q235-A
GB/T 699
GB/T3077
40MnVB
40MnVB
GB/T 3077
35CrMoA
40MnVB
35CrMoA
GB/T3077
25Cr2MoVA
25Cr2MoVA
35CrMoA
Studs and nuts
Nut materials
GB/T 700
Q235-A
GB/T 699
Q235 - A
GB/T3077
30CrMoA
35CrMoA
35, 45
45, 40Mn
30CrMoA
35CrMoA
30CrMoA
25Cr2MoVA
3dCrMoA
25C/2MoVA
30CrMoA
Applicable temperature
range, ℃
> - 20
20~ 400
70 ~ 450
Type B flange materials are selected according to the plates and forgings listed in the table, but Cr-Mo steel should not be used. The matching stud and nut materials shall be as specified in the table: 2 The long neck flange materials shall be selected according to the forgings in the table, and the matching stud and nut materials shall be as specified in the table 6
Nominal pressure PN
Nominal diameter
JB/T4700--2000
Stud material selection table
1) For 16Mn and 16MnR flange materials, when the working temperature is higher than 200℃, 40MnB should be selected instead. 2.50
40MnVB
Nominal pressure PN
Nominal diameter
40MnB)2)
40MnBl)-2
JB/T47002000
Table 4 Stud material selection table
40MnB\).2)
1) For 15CrMo flange material, when the working temperature is higher than 350℃, 40MnVB should be selected. 2.50
40MnVB2
35CrMoA
2) When the flange working temperature is higher than 400℃ or lower than or equal to -20℃, the stud material should be changed to 35CrMo.A. 8
40MnVB2)
35CrMoA
Nominal pressure PN
Nominal diameter
JB/T4700-2000
Table 5 Stud material selection table
40MnVBl
35CrMoA
1) When the flange operating temperature is higher than 400℃, the stud material should be changed to 35CrMoA. 2.50 | |tt | 5-A , B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
DN<14001 Code
Flange type code shall comply with the provisions of Table 8. Sealing surface type code shall comply with the provisions of Table 9. 4
Standard number
Nominal pressure PN
Diameter DN
JB/T4701
JB/T4700—2000
Table 1 Flange classification and parameter table
Slip-on flange
JB/T4702
Butt-weld flange
JB/T4703
+ type flange
Type B flange and long neck flange
Applicable temperature
Range, ℃
G B/T539
Oil-resistant asbestos rubber
Metal soft gasket
GB/T3985
Asbestos rubber sheet
GB/T539
Oil-resistant asbestos rubber
GB/T3985
Asbestos rubber sheet
Asbestos or graphite
Filling tape
Polytetrafluoroethylene
Filling tape
Copper, aluminum cladding
Low carbon steel, stainless steel cladding
> - 20
> - 20
> - 20
JB/T4700—2000
Flange, gasket,
Plate GB/T3274
Q235-A, B, C
Match right column
Flange material
Plate GB6654
Plate GB/T3274
Match right column flange
Q235-A, B, C
GB6654
Forging JB4726
Plate GB6654
Forging JB4726
15CrMo
Forging JB4727
Select flange materials on the right
09MnNiD
Forging JB4726
12Cr2Mol
Forging JB4726
20MnMo
Stud,
Nut material matching table
Applicable temperature
Range, ℃
40~350
70 ~350
0 ~ 450
Optional right column stud nut material
According to Table 3
Select the right column
stud material
Then select the screw
nut material
According to Table 4
Select the right column
stud material
Then select the screw
nut material
Optional right
stud nut
According to Table 5
Select the right column
stud material
Then select the screw
nut material
stud material
GB/T 700
Q235-A
GB/T 699
GB/T3077
40MnVB
40MnVB
GB/T 3077
35CrMoA
40MnVB
35CrMoA
GB/T3077
25Cr2MoVA
25Cr2MoVA
35CrMoA
Studs and nuts
Nut materials
GB/T 700
Q235-A
GB/T 699
Q235 - A
GB/T3077
30CrMoA
35CrMoA
35, 45
45, 40Mn
30CrMoA
35CrMoA
30CrMoA
25Cr2MoVA
3dCrMoA
25C/2MoVA
30CrMoA
Applicable temperature
range, ℃
> - 20
20~ 400
70 ~ 450
Type B flange materials are selected according to the plates and forgings listed in the table, but Cr-Mo steel should not be used. The matching stud and nut materials shall be as specified in the table: 2 The long neck flange materials shall be selected according to the forgings in the table, and the matching stud and nut materials shall be as specified in the table 6
Nominal pressure PN
Nominal diameter
JB/T4700--2000
Stud material selection table
1) For 16Mn and 16MnR flange materials, when the working temperature is higher than 200℃, 40MnB should be selected instead. 2.50
40MnVB
Nominal pressure PN
Nominal diameter
40MnB)2)
40MnBl)-2
JB/T47002000
Table 4 Stud material selection table
40MnB\).2)
1) For 15CrMo flange material, when the working temperature is higher than 350℃, 40MnVB should be selected. 2.50
40MnVB2
35CrMoA
2) When the flange working temperature is higher than 400℃ or lower than or equal to -20℃, the stud material should be changed to 35CrMo.A. 8
40MnVB2)
35CrMoA
Nominal pressure PN
Nominal diameter
JB/T4700-2000
Table 5 Stud material selection table
40MnVBl
35CrMoA
1) When the flange operating temperature is higher than 400℃, the stud material should be changed to 35CrMoA. 2.50 | |tt | 5-A , B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
DN<140050
25Cr2MoVA
25Cr2MoVA
Nominal pressure PN
Q235-A, B
Q235-c
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of Type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0 ℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃bzxZ.net
Working temperature lower limit 0℃
Working temperature lower limit 0 ℃
DN<140050
25Cr2MoVA
25Cr2MoVA
Nominal pressure PN
Q235-A, B
Q235-c
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of Type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0 ℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0 ℃
DN<140050
25Cr2MoVA
25Cr2MoVA
Nominal pressure PN
Q235-A, B
Q235-c
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of Type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0 ℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0 ℃
DN<140050
25Cr2MoVA
25Cr2MoVA
Nominal pressure PN
Q235-A, B
Q235-c
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-A, B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of Type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0 ℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0℃
Working temperature lower limit 0 ℃
DN<1400A. 8
40MnVB2)
35CrMoA
Nominal pressure PN
Nominal diameter
JB/T4700-2000
Table 5 Stud material selection table
40MnVBl
35CrMoA
1) When the flange operating temperature is higher than 400℃, the stud material should be changed to 35CrMoA. 2.50 | |tt | 5-A , B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
DN<1400A. 8
40MnVB2)
35CrMoA
Nominal pressure PN
Nominal diameter
JB/T4700-2000
Table 5 Stud material selection table
40MnVBl
35CrMoA
1) When the flange operating temperature is higher than 400℃, the stud material should be changed to 35CrMoA. 2.50 | |tt | 5-A , B
Q235-C
20MnMo
Q235-B
Q235-c
20MnMo
Q235-C
20MnMo
JB/T47002000
Applicable materials and maximum allowable working pressure of type B flange
> 20 ~ 200
degrees, ℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
working temperature lower limit 0℃
DN<1400
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