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
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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 SupervisionbzxZ.net 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 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. Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.