This standard specifies the product classification of marine welded copper flanges (hereinafter referred to as flanges). This standard applies to flanges with a nominal pressure not exceeding 2.5MPa and an operating temperature not exceeding 250°C. GB 2507-1989 Marine welded copper flanges (four-digit) GB2507-1989 standard download decompression password: www.bzxz.net

UDC 621.643.4 : 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 welded copper flanges
(Four-digit)
Marine blass pipe flanges, braze-on Subject Content and Scope of Application
This standard specifies the product classification of marine welded copper flanges (hereinafter referred to as flanges). This standard applies to flanges with nominal pressure not exceeding 2.5 MPa and working temperature not exceeding 250°C. 2 Reference standards
Flange connection dimensions and sealing surfaces (four-part) GB 2501
GB2502 Marine method = soft gasket (four-part price) Mechanical properties of fasteners Bolts, screws and studs GB 3098.1
Mechanical properties of fasteners Screws
GE 3098.2
GB5232 Additive chemical composition and product shape 3 Product classification
Basic technical parameters of flanges are as follows 1.
Working temperature, nominal pressure P
3.2 The dimensions of flanges are as shown in Figure 1 and Table 2.
China State Shipbuilding Corporation approved on March 27, 198946
Maximum operating pressure P, MPa
GB 2507--89
Generation #GB2507-86
Nominal diameter
10~500
10-250
Implementation on December 1, 1989
Nominal:
GB 250789
Extension rating
P -0.6MPa
Weight
South circle
Light thread and thread
GB 250r-89
Continued Table 2
Sealing element
Py = 0.6 MPa
PN=1. 0, 1.8, 2. 5 MPa
Welding seam
Bolts, screws and through holes
250267
GB2507—89
Continued Table 2
Neck
Narrow surface
P =1. 0 MPa
PN =1.6 MPa
Pn=z.5MPawwW.bzxz.Net
Welding seam
Bolts, screws and through holes
.3 Marking example
GB 2507—89
s.1 Marine welding copper flange with nominal pressure of 0.6MPa and nominal diameter of 50mm 6050GB2507—89
Marine welding copper flange with nominal pressure of 1.6MPa and nominal diameter of 250mm 3.2
Flange 16250GB 2507—89
Technical requirements
4.1 The materials of flange, bolts and nuts shall be in accordance with Table 3. Table 3
Parts name
Silicon brass
Brand performance level
HSi 80-3
Star or 5 level
Standard number
GB 5232—85
GB 3098.1—82
GB3098.2—82
4.2 The mechanical properties of the welding rod shall not be lower than the lower limit of the mechanical properties of the welded parts (flanges or pipes) with lower strength. Table.8 The surface of the flange shall be smooth and shall not have defects that reduce strength and affect sealing. The end face of the flange shall be perpendicular to its axis and the deviation shall not be greater than 30.4.4
The negative deviation allowed for flange thickness is 0.5mm. 4.57
The soft gasket used for the flange shall be in accordance with GB2502.
The connection dimensions and sealing surface of the flange shall be in accordance with GB2501.4.7
5 Inspection rules
5.1 The flange shall be inspected and accepted by the technical inspection department of the manufacturer and a certificate of conformity shall be issued. 5.2 The inspection contents during acceptance include material certificate, dimensions and appearance. Marking
The following markings shall be made on the surface of the outer cylindrical bar of the flange. Manufacturer's trademark,
Specifications and standard numbers specified in this standard;
Production batch number 1
Inspection pass stamp.
GB2507-
Additional instructions:
This standard was proposed by the 603 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 Qian Weihai, Sun Jingming and Wu Shaozeng. This standard is provided by the unified construction sample.
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