This standard specifies the structural type and series dimensions of long-neck butt welding flanges for steel pressure vessels. JB/T 4703-2000 Long neck butt welding flange JB/T4703-2000 standard download and decompression password: www.bzxz.net

JB | |tt||National Machinery Industry Bureau
National Petroleum and Chemical Industry Bureau
Implemented on 2000-09-30
Released
JB/T4703—2000||tt| |Long neck butt welding flange
1 range
Industry standard of the People's Republic of China
Long neck butt welding flange
Welding neck flange
This standard Specifies the structural type and series dimensions of long-neck butt welding flanges for steel pressure vessels. JB/T 4703—2000
replaces JB4703—1992
This standard is applicable to the long-neck butt welding method of steel pressure vessels with nominal pressures of 0.6~6.4MPa and operating temperatures of -70~450°C. orchid.
This standard is applicable to the corrosion area ≤3mm
2 cited standards
The provisions contained in the following standards constitute the provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. JB/T4700—2000 Pressure vessel flange classification and technical conditions JB/T4704—2000 Non-metallic soft gasket
JB/T4705—2000 spiral wound gasket
JB/T4706—2000 metal package tab| | tt | The series dimensions should comply with the regulations in Figures 1 to 6 and Table 1. The quality of the flange and ring is listed in Table 2.
4 Selection regulations
4.1 The materials, maximum allowable working pressure, technical conditions and markings of flanges and matching gaskets, studs and nuts are in accordance with the provisions of JB/T4700.
4.2 Non-metallic soft gaskets, non-metallic gaskets, and metal-clad gaskets used for flanges shall comply with the regulations of JB/T4704, JB/T4705, and JB/T4706 respectively.
4.3 Equal-length double-headed studs for flanges shall comply with the requirements of JB/T4707. 4.4 When the thickness of the butt cylinder connected to the flange is less than the minimum butt cylinder thickness 8 in Table 1. When required, the total flange height H should be adjusted according to the requirements in Table 3, and the flange thickness should be noted in the flange mark. State Machinery Industry Bureau
Approved on 2000-04-24
National Petroleum and Chemical Industry Bureau
Implemented on 2000-0930
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Picture 1 flat sealing surface
Others
White surface
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Figure 2 Stomach protrusion Sealing surface
Base must be
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Figure 3 rod groove sealing surface
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Figure 4 Lining ring flat sealing surface
This dyeing total
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face|| tt||Four sides
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Figure 5 Lining ring concave and convex sealing surface
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Figure 6 Lining ring sample groove sealing surface|| tt||its miscellaneous modifications
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