This standard specifies the basic parameters and dimensions of marine cast steel flanges (hereinafter referred to as flanges). This standard applies to flanges with a nominal pressure not exceeding 6AMPa and an operating temperature not exceeding 400°C. GB 2504-1989 Marine Cast Steel Flanges (four-digit) GB2504-1989 Standard download decompression password: www.bzxz.net

UDC 621. 648.4 : 629.4
National Standard of the People's Republic of China
GB10745~10751—89
GB25012508—89
Marine method
(four-digit)
Marine pipe flanges
1989-03-31 Issued
1989-12-01 Implementation
State Bureau of Technical Supervision Issued
W. National Standard of the People's Republic of China
Marine cast steel flanges
(four-digit)
Marine cast steel pipe flanges Subject content and scope of application
This standard specifies the basic parameters and dimensions of marine cast steel flanges (hereinafter referred to as flanges). This standard is applicable to flanges with nominal pressure less than 6.4 MPa and working temperature not exceeding 1400°C. 2 Reference standards
GB2501 Marine flange connection dimensions and sealing surface (four-digit) GB2502 Marine flange soft drawing (four-digit) GB979 Carbon steel casting classification and technical specifications
GB3098.1 Mechanical properties of fasteners Bolts, screws and nuts G3098.2 Mechanical properties of fasteners Screws
GB 897 Studs (L, = 1d)
Studs (L, -1.25d)
GB 898
9 Studs (1.5d, = 1.5d)
GH 899
GB 900
Studs (1.5d, = 2d)
3 Classification of flanges
3.1 The basic parameters of flanges are as shown in Table 1.
Nominal temperature is
Operating temperature, C
Maximum operating pressure, MPa
Approved by China State Shipbuilding Corporation on March 27, 1989
GB 2504--89
Replaced GB 2504-81
Nominal diameter D%
~2 (on
10~1000
10 ~ 5UU
1989-12-01 implementation
GB 2504-89
3.2 Nominal pressure P%0.25, 0.6, 1.0, 1.6, 2.5MPaThe dimensions of the flange are based on the remainder of Figure 1 and Table 2
Ph- 0.25, 0.6MPa
According to the inspection thread and through hole
Countersunk seat
W.Public
10 dynamic 0
GB250489
Continued Table 2
Dense village surface
Ph - 0. 25, 0. 6 M Fa
Pn-0.25MPa
F - 0.6MPa
Py - tot6 wPa
Bolt thread and through hole
Countersunk head
Nominal
GB 2504-89
Continued Table 2
P% -1. 0, 1.6MPa
Butterfly bolt thread and through hole
Countersunk
W.Nominal
GB 250489
Continued Table 2
Flanton
Sealing surface
P = 1.oMPa
Py =1.6MPa
Bolt thread and through hole
Countersunk
W.Nominal
1 000)
GB 2504.89
Continued Table 2
Blue: Use the certificate head seat instead of the method "back and bracket, the solid seat detection is to bracket the card 20
earn light thread section through hole
TI srI
And the head seat
W.GB 250489
3.3 The dimensions of the flange with nominal P of 0.6.4MPa shall be as shown in Figure 2 and Table 3. Figure 2
Infant control screw thread
W. Nominal
Method "Rating
180#135
150345
From opposite side
GB 250488
Continued Table 3
P.=4.0MPa
Ps=6.1MPa
Dense surface
It is allowed to use the head degree instead of the flange and level it. Jiang:
The depth of the seat is until it is leveled.
Anti-head seat
Bolt thread and through hole
4 Technical requirements
GB 2504--89
4.1Material of flange, screw, stud and screw
4. Standard number or performance grade
4 or equivalent
Standard number
GE979-·67Www.bzxZ.net
GB 3098.1-R
GB 30943 -- 62
4.2When the working temperature exceeds 300'C, the double-headed screw of GB 897, GB 88R, GB89, GB500 shall be turned according to the inner diameter of the screw.
The allowable negative code for the thickness of .3 flange is 0, and the flange used with the type pad drawing is in accordance with C2502
4.5·The flange connection size and sealing surface are in accordance with 32501. Note:
This standard is proposed by the China Shipbuilding Industry Corporation. The standard is drafted by China Shipbuilding Corporation. The main contributors of this standard are Yu Weihai, Sun Kuaiyin and Wu Shaozeng. 9F
W.
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