GB/T 2506-1989 Marine lap-welded steel flange (quadruple) GB/T2506-1989 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 lap-welded steel flanges
(Four-digit)
Marine steel pipe flangesifiltet weld-on Subject content and scope of application
This standard specifies the product classification of marine lap-welded steel flanges (hereinafter referred to as flanges). This standard applies to flanges with nominal pressure not more than 1.6MPa and working temperature not more than 300℃. 2 Reference standards
GB2501 Marine flange connection dimensions and sealing surface (four-position) GB2502 Marine flange soft ring (four-position) GB 700 Carbon steel
Mechanical properties of fasteners Bolts, screws and studs GB3098.2 Mechanical properties of fasteners Screws
GH5312 Carbon steel seamless steel pipe for shipbuilding
YB242 Diameter: 152mm Electric welded steel
GB3091 Galvanized steel pipe for low-pressure fluid transportation GB3092 Welded steel pipe for low-pressure fluid transportation 8 Product classification
3.1 Basic parameters of flanges are in accordance with Table 1.
Nominal pressure P
3.2 Dimensions of flanges are in accordance with Figure 1 and Table 2.
China State Shipbuilding Corporation approved Table 1 on September 27, 1989
1 Operating temperature,
Maximum operating pressure, MPa
GB 2506-89
Replaced GB 2506-6
Nominal diameter*D
10-2000
10~1800
Implemented on December 1, 1989
Outer diameter D
GB 2506--89
Constant edge height
Degree and chamfer
Angle width
PN = 0.25, 0.R MPa
Screw inspection screw and screw thread
Outer diameter of screw thread
600610
120012211
1800620
1Rania2n
2 0902020
上.9901930
21942130
162485
1513539
话15635
牙用户
J615j635
由用户
G260年—安
续表·2
密讨论面
焊继高距
度与像
角边方案
-Py = 0.25. 0.6MPa
P = 0. 25 MPa
Pe.=DB MPa
Screw conveyor and re-
HUE
160360381
462|485
GB 2506-B8
Continuation 2
Dense surface
PN-U.6MPa
Ps - 1.0,1.6MPa
Height and thoroughness
Weak thermal conductivity
Bolt thread mark
9,73
Pipe outer diameter
5139535
615j633
360381
F410j436
[4621485
5:353 Jin
GB 2506—69
Continued cutting 2
Sealing surface
Pe-t.uMPa
P -t.tmpa
Light height
Height and inverted
Thread pattern and through hole
Extension. The connection dimensions in the first column are international common dimensions, and the connection dimensions in the second column are domestic common dimensions. 3.3 Marking examples
3.3.1 Flange 6050GB 2506-89 with nominal force of 0.6 MPa and nominal diameter of 50 mm
Marine steel flange 16400GR2506--89 with nominal pressure of 1.6 MPa and nominal diameter of 400 mm
Technical requirements
4. The materials of flanges, bolts and screws shall be in accordance with Specification 3. Part name
Monument number or performance
Q 235 A
4, multi-line
4 or 5
Standard conductor
G 70:1 —88
GR 3[9x.1-8?
G5 3698.2 :82
GB 2506-89
.2 The welded steel pipe shall be in accordance with GB5312: the welded steel shall be in accordance with YB242* water, coal (steel pipe shall be in accordance with GB3091, GB3092. 1.3 The mechanical properties of the welding rod shall not be lower than the lower limit of the mechanical properties of the welded parts with lower strength: (flange or pipe F). 4.4 The surface of the flange shall be smooth and shall not have defects that reduce the strength and affect the sealing. 4.5 The end face of the flange shall be perpendicular to its axis, and the deviation shall not exceed 30°. 4.6 The allowable negative difference in the thickness of the flange is 0.5mm. 4.7 The cushion used for the flange shall be in accordance with GB2502. 4.8 The connection dimensions and sealing of the flange shall be in accordance with GH2501. 5 Inspection rules
The flange shall be inspected and accepted by the manufacturing and technical inspection departments, and Issue a certificate of conformity. 5.1
5.2 The inspection contents during acceptance include material certificate, size and appearance. 6 Marking, Packaging
6.1 The following marks shall be printed on the outer surface of the flange: manufacturer's trademark:
b, specification and standard number specified in this standard; c
production batch number:
. d. Inspection seal.
6.2 The flange surface shall be free of industrial dust before packaging. Additional remarks:wwW.bzxz.Net
This standard is proposed by the Sixth Institute of China State Shipbuilding Corporation. This standard was drafted by China Shipbuilding Corporation. The main drafters of this standard are Yu Hai, Sun Jingming and Wu Shaozeng. This standard is proposed by the unified construction drawings.
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