This standard specifies the basic parameters and dimensions of marine cast copper flanges (hereinafter referred to as flanges). This standard applies to flanges with a nominal pressure not exceeding 4.0 MPa and an operating temperature not exceeding 250°C. GB 2505-1989 Marine cast copper flanges (four-digit) GB2505-1989 standard download decompression password: www.bzxz.net

UDC 621.648.4 : 629.4
National Standard of the People's Republic of China
GB 10745~10751—89
GB2501~250B—89
Marine pipe flanges
Published on March 31, 1989
Implemented on December 1, 1989
Published by the State Bureau of Technical Supervision
National Standard of the People's Republic of China
Marine cast copper flanges
(Four-digit)
Marine cast brass flanges Subject content and applicable scope
This standard specifies the basic parameters and dimensions of marine copper flanges (hereinafter referred to as flanges). This standard is applicable to flanges with nominal pressure not exceeding 4.0MPa and working temperature not exceeding 250℃. 2 Reference standards
Applicable flange connection size and sealing rain (four-position) GB2501
GB2502 bzxZ.net
Applicable flange soft gasket (four-position)
CB1176 Technical conditions for cast copper alloys
GB 3098.1
Mechanical properties of fasteners, bolts, screws and studs GB 3098.2 Mechanical properties of fasteners nuts
3 Classification of flanges
3.1 The basic parameters of flanges are in accordance with Table 1.
Nominal pressure PN
Maximum operating pressure: 1, MP#
3.2 The dimensions of flanges with nominal pressure R: 0.6, 1.0, 1.6, 2.5MPa are in accordance with Figure 1 and Table 2. Approved by China State Shipbuilding Corporation on March 27, 198924
GB 250589
Replaced GB 2505-81
European diameter Dr
10-500
10~100
Implemented on December 1, 1989
GB250689
Py - 0.6MPa
Bolt thread and through hole
GB 2505--89
Continued Table 2
Flange neck
Py =0.g MPa
R - 1., 1. 6, 2.5MPa
P -1.0.1.6MPa
Light screw and hole
Anti-head seat
GB 2505-89
Continued Table 2
Dense surface
P=1.0 MPa
P = 1.6 MPa
PK=2.SMPA
Flange screw and screw
Countersunk head seat
GB 2505—89
Continued Table 2
FN -2.5MPa
Note: Countersunk head seat can be used to replace flange, and the head seat is flat. 3.3 The dimensions of the standard pressure P of 4.0MPa are in accordance with Figure 2 and Table 9. Door
Screw wheel end line and suitable hole
Anti-solid seat
Anti-Lanton
Cable cover
GB2505-89
Sealing surface
94 110
105 121
Note: It is allowed to use a solid seat instead of a solution method without brackets, and the sinking depth is based on the bracket. Technical requirements for the screw thread, screw thread and screw thread shall be in accordance with the table. Table 4 Part name Nominal TPN G: 4.0 PN.159) Casting stainless steel Cast bronze Iron manganese yellow steel Flat screw thread and through hole Seat No. Performance grade ZQ5n8-4 ZQSm10-2-2QA19-2 ZEEMu58-2 Grade 1 or 5 Standard No. GE 117687 GB 98.1-82 CR 3098.2 --82
4.2 The negative deviation of flange thickness is allowed to be 0.5mm. The flange used in France shall be in accordance with GB2502.
GB 2505-B9
The connection dimensions and sealing surfaces of the flange shall be in accordance with (iB 2501. 4.4
Additional remarks:
This standard was proposed by the 603rd Institute of China State Shipbuilding Corporation. This standard was submitted by Zhonghua Shipyard.
This standard was drafted by Zhonghua Shipyard.
The main drafters of this standard are Yu Weihai, Sun Jingming and Wu Shaozeng. 3
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