This standard specifies the shape and size of marine flange gaskets. This standard applies to flange gaskets with nominal pressure of ship pipelines not exceeding 6.4MPa and nominal diameter of 10~2000mm. GB 2502-1989 Marine Flange Gaskets (four-digit) GB2502-1989 Standard download decompression password: www.bzxz.net

UDC 621.648.4 : 629.4
National Standard of the People's Republic of China
GB 1074510751—89
GB2501~250B—89
(Four-digit)
Marine pipe flanges
1989-03-31 Issued
1989-12-01 Implementation
Issued by the State Bureau of Technical Supervision
W.National Standard of the People's Republic of China
Marine flange soft gasket
(Four-digit)
Marine pipe flages - soft gasketSubject content and scope of application
This standard specifies the shape and size of marine flange soft gaskets. GB 2502-89
Replaces GB 2502-8[
This approval applies to flange gaskets with nominal pressure not exceeding 6.4MPa and nominal diameter of 10~2000mm for ship pipelines. 2 Reference standards
GB539 Oil-resistant asbestos rubber sheet
GB4807 Food rubber gasket (ring) Hygienic standard JC125 Rubber asbestos sheet
3 Gasket size
According to Figure 1 and Table 1.
Stone sugar rubber sheet is 2mml cloth rubber is 3mm. Approved by China Shipbuilding Industry Corporation on March 27, 1989, and implemented on December 1, 1989
W. Nominal diameter
20.25.1.6.
1.0-1.6, 2.5
Inner diameter d
GB 250288
Nominal standard Pu, MPa
4.6, 6.4
Inner diameter d
Outer diameter D
W.4 Technical requirements
Material technology of gasket and its applicable scope are shown in Table 2.
Gao Le asbestos rubber sheet
Medium pressure stone sugar spicy board
Fermented oil asbestos rubber sheet
Equal hardness and medium
Elastic cloth rubber
Food-use stable rubber gasket
Standard number
1 C 125—66
JC 125—-66
GB539-65
GB4807—84
GB 2502--88
Applicable materials
Superheated steam, saturated steam, sea water, fresh water (except water test), air, flue gas and inert gasSuperheated steam, saturated steam, plum water and fresh water (except drinking water)
Fuel and lubricating oil
Sea water, fresh water (except drinking water), air, lubricating oil and fuel and drinking water
1,2 The physical and mechanical properties of cloth rubber shall be as per Table 3. Tensile strength
Rubber
Elongation
Not less than
Medium impact strength
Elasticity
Permanent test
Not more than
Shore silica
45 ~ 65
Nominal pressure
Stability coefficient
At working temperature bzxZ.net
Or KOH
Note: For lubricating oil or fuel oil, it is required to be immersed in 15~20 lubricating oil or gasoline for 24 hours, and then check its weight increase percentage (to the original weight). The lubricating oil shall not be greater than 3%, and the gasoline shall not be greater than 30%. W. Additional remarks:
GB2502-89
This standard was proposed by the 603rd Institute of China Shipbuilding Industry Corporation. This standard was issued by China Shipbuilding Corporation.
This standard was drafted by Tuhua Shipyard. The main drafters of this standard are Yu Weihai, Sun Jingming and Wu Niu Zeng.
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