HG 20625-1997 Pressure-Temperature Ratings for Steel Pipe Flanges (American System) HG20625-1997 Standard download decompression password: www.bzxz.net

Pressure-temperature grades for steel pipe flanges
(American system)
HG20625-—97
Subject content and scope of application
This standard specifies the maximum non-shock working pressure of steel pipe flanges (American system) at working temperature. This standard applies to the steel pipe flanges and flange covers specified in HG20615: 401
IIG20615
HG 20624
Reference standards
《Types and parameters of steel pipe flanges (American system)》《Technical conditions for steel pipe flanges (American system)》3 Maximum non-impact working pressure
3.0.1 The maximum non-impact working pressure of steel pipe flanges and flange covers with a nominal pressure PN of 2.0MPa (Clas150) to 42.0MPa (ass2500) at working temperature shall be in accordance with the specifications of Table 3.0.1-1 to Table 2.0.1-6. The intermediate overflow shall be determined by the internal method. The material categories listed in Table 3.0.1-1 to 6 shall be in accordance with the provisions of HG30624. The use temperature range of the material shall be in accordance with the provisions of HG 20624.
3.0.2 Working temperature refers to the temperature of flange metal under pressure. When the working temperature is lower than 38℃, the non-shock working pressure value of flange is the same as that at 38℃.
3.0.3 If the two flanges of a flange joint have different pressure ratings, the maximum non-shock working pressure value of the joint shall be the lower value, and the screw torque during installation shall be controlled to prevent over-tightening. 3.0.4 When the working temperature is higher than the temperature listed in the table and there is no exact (rated value), it can be determined by the designer based on experience or calculation.
3..5 When using materials other than those listed in the table, the maximum non-impact working pressure of the flange can be determined according to the material's allowable sensitivity and energy rules, referring to the materials listed in the table, but it must not be greater than the values ​​in Table 35. ℃.5. Table 3.1--1 Maximum non-impact working pressure
PN 2.0MPa (Class 750)
Flange material classification
Table 3.0.1-2 Maximum non-impact working pressure PN 50MPa (Class 5 300)
Flange material category
Table 3.0.13 Maximum non-impact working pressure PN 11.UMPa (Ciass 6c0) bzxz.net
Flange material category
i 6s t3. 51 ?
12, 07
3.01-4 Maximum non-impact working pressure
PN15.jMPa(Cla3 90)
Metallurgical material category
12, 53
14.06.15.36
.3. 45
【MPa)
10.3512.45
11, 95
15. 48 : 20.12
Table 3.0.1.3 Maximum non-impact working pressure
PN26. 0MP(Class 1500)
Flange material category
24.39:16.38
11. 58 : 14. 31
Table 3. 0. 1-6 High non-shock working pressure PN42. 0MPa(Clus9 200)
Flange material category
32.34 129.43
11, 29
41.83 30, 28
28. 74 : 34.59
26.02.31.25
23.91:28.65
20.0424.45
18.921 23.73
(Clasr 150)
tClass 300)
Maximum working pressure rating
(Class 600)
(Clag 900)
Note: The maximum rated pressure value of P2.0MPa (Cla150) is the value when it is 540. Additional remarks: This standard proposes the unit, the editor-in-chief and the main drafter. Proposing unit: Chemical Process Piping Design Technology Center Station of the Ministry of Chemical Industry Equipment Design Technology Center Station of the Ministry of Chemical Industry
Working unit: Equipment Design Technology Center Station of the Ministry of Chemical Industry Main drafter: Ying Daoyan Lujun
(Class 1500)
(Class2500)
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