This standard specifies the basic parameters and dimensions of marine cast iron flanges (hereinafter referred to as flanges). This standard applies to flanges with a nominal pressure not exceeding 1.6MPa and an operating temperature not exceeding 220°C. GB 2503-1989 Marine Cast Iron Flanges (four-digit) GB2503-1989 Standard download decompression password: www.bzxz.net

UDC 62T.643.4 : 629,4
National Standard of the People's Republic of China
GB 10745~10751--89
GB2501-2508—89
(four-digit)
Marine pipe flaages
1989-03-31 IssuedbzxZ.net
1989-12-01 Implementation
State Administration of Technical Supervision Issued
National Standard of the People's Republic of China
Marine cast iron flanges
(four-digit)
Marine cast iron plpe flanges1 Subject content and scope of application
This standard specifies the basic parameters and dimensions of marine cast iron flanges (hereinafter referred to as flanges). This standard is applicable to flanges with a nominal pressure of no more than 1.6MPa and a working temperature of no more than 220C. 2 Reference standards
GB2501 Marine flange connection dimensions and sealing surfaces (four-digit) GB2502 Flange soft gaskets (four-digit) GR976 Classification and technical conditions of gray cast iron parts
GB3098.1 Mechanical properties of fasteners: scales, screws and studs GR3098.2 Mechanical properties of fasteners: nuts
3 Classification of flanges
3.1 Basic parameters of flanges are as shown in Table 1.
Temperature, nominal pressure
3.2 Dimensions of flanges are as shown in Figure 1 and Table 2.
China State Shipbuilding Corporation 1989-0327 approved 10
Maximum operating pressure, M
GB2503-89
Replaced GR 2503-81
Nominal diameter LN
10 ～1 000
1989-12-01 implemented
GB 250389
Flange frequency
Outside
Bolt thread leather pass
Countersunk seat
GB2508-89
Continued 2
Dense before
PN = 0.6MP a
F - E..GMPa
End inspection burst and suitable
Countersunk seat
GB 2503-88
Continued 2
P = 1.0MPa
Back: It is allowed to use a countersunk head instead of flattening the back of the flange, and the depth of the head seat shall be until it is flattened.
Bolt thread and through hole
Countersunk seat
4 Technical requirements
4.1 The materials of flange, bolt and screw shall be in accordance with Table 3. Part name
GB250389
4.2 The negative offset of thickness is allowed to be 0.5mm. The soft ring used in flange shall be in accordance with GB 2502.
44 The connection scale and sealing surface of the connection shall be in accordance with GB 2501. Addendum:
This standard is proposed by the 63rd Institute of China Haobo Industry Corporation. This standard is drafted by China Shipbuilding Corporation. This standard is drafted by China Shipbuilding Corporation. The main authors of this standard are Yu Weihai, Sun Jingming and Wu Shaozeng. Brand performance level
HT 20— 40
Grade or 5
GB 976--67
GB 3098.1--82
GB 3098.2 -R2
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