This standard specifies the sealing surface of the marine flange connection size. This standard applies to the general purpose various pipeline flange connection sizes and sealing surface shapes and sizes with a nominal pressure of no more than 6.4MPa and a nominal diameter of 10~2000mm for ship pipelines. GB 2501-1989 Marine flange connection size and sealing surface (four-digit) GB2501-1989 standard download decompression password: www.bzxz.net

UDC 621.643.4 : 629.4
National Standard of the People's Republic of China
GB10745~10751-89
GB2501~2508—89
Moon flange
(Four-position)
Marine pipe flanges
1989-03-31 Issued
1989-1201 Implementation
State Administration of Technical Supervision IssuedwwW.bzxz.Net
W.National Standard of the People's Republic of China
Marine pipe flanges-Conpactiondimensions and nating This standard adopts the standards 1S02084-1974 "General pipeline method", IS2441-1975 "Sectional pipeline method for pipe connection and applicable specifications" and GB 2501--89 GR2501-81 Metric system - Fitting dimensions and this standard specifies the flange connection dimensions and sealing dimensions. This standard is suitable for various pipe connections with a nominal diameter of 10 to 2000 mm, pressure not exceeding 6.4 MPa, and a nominal diameter of 10 to 2000 mm. This standard is also suitable for the connection between marine equipment and pipes or accessories. No. 2
D—Nominal diameter, machine diameter, nm;
—diameter of the center of the grid hole, mm
dr—bolt diameter, mn :
Th.—thread diameter, mn,
—nominal force, MPas
—number of holes, pcs.
3 Circular reverse connection size! And Table 1
Zhongquan Shipbuilding Industry Corporation 1988-03-27 approved 1989-12-01 implementation
W. Nominal diameter
13751320
15751520
17901730
19901930
21902130
GB 2501—89
.i Th.
:130100
140110
190158
zF0170
240200
265225
295255
3202B0
345305
540495
595550
645600
7551705
1075102u
175120
3214051340
361638j156
18301760
204519793
48226 52180
Pn ,MPa | 405H5
840770
1323950
1125:1050
12557u42
14851390
16851590
1930820
213012020
CB 2501-89
Pn, MFa
330280
7306G0
2345223062
4201355
660585
345280
375316
800705
Oval flange connection size shall be as per Figure 2 and Table 2, nominal diameter
GB 2501--89
Nominal injection force PN=0.BMPa
5 The shape and size of the convex surface of the flange sealing surface shall be as per Figure 3 and Table 3. Figure 3
W. Nominal diameter
GB 2501—89
Nominal pressure PN,
Diameter of nominal pressure PnF2
Note;) The size is the maximum value.
2) 45” can be used as the example. Radius 7.8
GB 2501—89
The shape and size of the groove surface of the seal surface shall be in accordance with Figure 4 and Table 4D
Nominal diameter
Nominal pressure PN = 4.0, 6.4MP±
Additional remarks:
This standard was proposed by the Sixth Institute of China State Shipbuilding Corporation. This standard is under the jurisdiction of China Shipbuilding Corporation.
This standard was drafted by China Shipbuilding Corporation. The main drafters of this standard are Yu Weihai, Sun Jingming and Wu Shaozeng. D,
W.
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