JB/T 1308.13-1999 This standard is a revision of JB 1320-73 "Pg (2500kgf/cm2) flange type, size and technical requirements". This standard specifies the flange type, size and technical requirements for ultra-high pressure valves. This standard is applicable to flanges for neutral media such as ethylene and polyethylene with a nominal pressure of 250MPa. This standard was first published on the date of year. JB/T 1308.13-1999 PN250a flange type, size and technical requirements JB/T1308.13-1999 standard download decompression password: www.bzxz.net

ICS23.060
Machinery Industry Standard of the People's Republic of China
JB/T1308.1~1308.21-1999
PN250MPa ultrahigh pressure valves and fittings
Technical conditions
Specifications for PN250MPa ultrahigh pressure valves and fittings
Published on July 12, 1999
National Machinery Industry Bureau
Implementation on January 1, 2000
Machinery Industry Standard of the People's Republic of China
PN250MPa flange
Type, dimensions and technical conditions
specifications of PN250MPa flanges
This standard specifies the flange types, dimensions and technical requirements for ultra-high pressure valves. This standard applies to flanges for neutral media such as ethylene and polyethylene with a nominal pressure of PN250MPa. 2 Reference standards
JB/T1308.13-1999
Replaces JB1320-73
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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 196—1981
GB/T 197—1981
GB/T1804—1992
GB/T3077—1988
JB/T1308.2—1999
3 Structural types and dimensions
Basic dimensions of common threads (diameter 1~600mm)Tolerances and fits of common threads (diameter 1-355mm)General tolerancesUnspecified tolerances of linear dimensions
Technical conditions for alloy structural steel
PN250MPaTechnical conditions for valves, fittings and fasteners3.1 The types of flanges are divided into three types: A, B and C, as specified in Figure 1. D
Approved by the State Machinery Industry Bureau on July 12, 1999, R0.5/
Implementation on January 1, 2000
The dimensions of the flange shall be as specified in Table 1.
Nominal diameter
4Technical requirements
Thread code
M33×2 left
M48×2 left
M60×3 left
M60×3
M72×3
M90×3
M48x2 left
M60×3 left
M72×3 left
JB/T1308.131999
4.1Material of A, B and C flanges: 40MnVB or 35CrMoA, technical requirements are in accordance with GB/T3077. Mechanical properties after heat treatment are in accordance with Table 2. 4.2
Material grade
40MnVB
35CrMoAbzxZ.net
Tensile strength. ,
≥735
Yield point. ,
≥637
≥490
Elongation 5,
Shrinkage $
Impact value A,
The basic dimensions of the thread shall comply with the provisions of GB/T196, and the tolerances shall comply with the 6H grade precision specified in GB/T197. The thread surface shall not have defects such as cracks and depressions that affect the strength, and the incomplete threads of the first circle shall be removed. The tolerances of the machining dimensions not specified shall comply with the provisions of GB/T1804. 4.5
Measures shall be taken on the threaded part to prevent biting. The flange shall be chemically treated to prevent atmospheric corrosion. 4.6
241~302
217-269
Each flange should be stamped with a steel stamp on the outer surface (marked in the figure), and the stamp content is: JB/T1308.13 specification/batch number. 4.7
Ultrasonic flaw detection, magnetic particle flaw detection and other technical requirements of flanges shall comply with the provisions of JB/T1308.2. 4.8
Marking example
Type A flange with a nominal diameter of 15mm:
Flange A-DN15JB/T1308.13—1999
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