GB 5908-1986 Fire resistance and test methods of flame arresters for petroleum storage tanks

GB 5908-1986 Fire resistance and test methods of flame arresters for petroleum storage tanks GB5908-1986 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
The quenching ability of flame arresters andits test method for petroleum tanksUDC 621-75: 622·69
：389·64
GB 5908—86
This standard applies to the evaluation and test of the fire arresting performance of flame arresters (hereinafter referred to as flame arresters) installed on storage tanks for crude oil, gasoline, kerosene and other light oil products.
1 Technical requirements
1.1 Materials of flame arresters
1.1.1 Cast iron is suitable for the flame arrester shell, and its performance should comply with GB976-67 "Classification and Technical Conditions of Gray Iron Castings"; cast aluminum can also be used, and its performance should comply with JB2120-78 "Technical Conditions of Aluminum Alloy Castings", and other equivalent materials can also be used. 1.1.2 The fire barrier layer must be made of metal materials that are corrosion-resistant under the conditions of use. 1.1.3 Animal or plant fibers shall not be used as gaskets inside the flame arrester and at the joints. 1.2 Performance of flame arrester
1.2.1 The flame arrester shell should be able to withstand a water pressure of not less than 0.9MPa, without leakage, cracks or permanent deformation. 1.2.2 The flame arrester should be able to continuously perform explosion-proof tests for thirteen times and be able to prevent fire each time. 1.2.3 The flame arrester should be able to withstand a burn-resistant test for 1h without tempering during this period. 1.3 Connection type
1.3.1 The connection type of the flame arrester is flange connection or threaded connection. 1.3.2 The connection flange of the flame arrester shall comply with the provisions of JB78-59 "Cast Iron Flange". 1.3.3 The connection thread of the flame arrester shall comply with the provisions of YB822-57 "Conical Pipe Thread". 2 Test method
2.1 Water pressure test
2.1.1 During the water pressure test, the pressure should be gradually increased to the specified value, and the pressure should not be increased sharply. The pressure should remain unchanged within the time specified in 2.1.2.
2.1.2 The flame arrester shell is subjected to a pressure of not less than 0.9MPa for not less than 1min, and the result should meet the requirements of 1.2.1. 2. 2 Explosion resistance test
2.2.1 The explosion resistance test device is shown in Figure 1. The length of the explosion pipe section and the observation pipe section should not be less than 1.5m, and its diameter should be the same as the nominal diameter of the flame arrester to be tested. An air outlet pipe and a test medium inlet pipe are respectively set at the ends of the explosion pipe section and the observation pipe section. 2.2.2 The ignition electrode should be installed at the end of the explosion pipe section, 80mm away from the end face. 2.2.3 Install a flame detection probe on the explosion pipe section and the observation pipe section respectively, with a distance of 100mm from the flange surface of the flame arrester to be tested, to detect whether the flame arrester is flame-proof. 2.2.4 The test medium is a mixture of naphtha vapor and air. The selected naphtha is specified as the fraction with a 10% point below 175°C and a 95% point not higher than 240°C in Engelhard distillation. The volume concentration of naphtha vapor in the mixed gas should be 1.9%±0.1%. 2.2.5 Seal the end of the observation pipe section with a plastic film. 2.2.6 The test medium is introduced from the inlet pipe, and the air in the pipe section is discharged from the outlet pipe. The sample to determine the gas concentration in the pipe section is extracted from the outlet pipe. The gas concentration in the pipe section must meet the requirements of Section 2.2.4. Issued by the National Bureau of Standards on March 3, 1986
Implemented on December 1, 1986
GB5908-86
Figure 1 Schematic diagram of explosion-proof device
1-Outlet pipe; 2-Ignition electrode: 3-Explosion tube; 4-Detection flame probe, 5-Tested flame arrester, 6-Observation tube; 7-Inlet pipe; 8-Plastic film2.2.7 The test is carried out under normal pressure, and the mixed gas in the test device is ignited with the ignition electrode. Observe whether there is a flame at the plastic film in 2.2.5 to determine whether the flame arrester is flame-proof. 2.2.8 The test results must meet the requirements of 1.2.2. After each test, the residual gas in the test device should be purged with air before the next test. 2.3 Burning test
2.3.1 The test medium is a mixture of naphtha vapor and air, and the volume concentration of naphtha vapor should be 3%±0.2%. 2.3.2 The test device shall include a dynamic gas distribution system that can continuously supply the test medium. 2.3.3 The flame arrester to be tested shall be placed upright, as shown in Figure 2. The test medium shall be supplied by the dynamic gas distribution system and ignited at the flame arrester outlet. Figure 2 Schematic diagram of the burn-resistant device
1- flame arrester to be tested, 2- flow stabilizing tube; 3- dynamic gas distribution system; 4- gas source 325
GB 5908--86
The mixed gas shall be allowed to burn on the surface of the fire barrier layer. 2.3.4 The gas supply flow rate shall be as shown in the following table,
Nominal flame arrester
Diameter mm
Gas supply flow
2.3.5 During the test, samples of the test medium shall be drawn from the gas supply inlet of the flame arrester to be tested every 10 minutes for analysis, and the concentration of the mixed gas must meet the requirements of Section 2.3.1. 2.3.6 During the test, the upper, middle and lower temperatures of the flame arrester shell shall be measured once every 10 minutes. 2.3.7 Start timing after ignition and visually check whether the flame arrester has backfired. The entire test lasts for 1 hour, and the result shall meet the requirements of 1.2.3.
3 Marking and product certificate
3.1 Marking
A nameplate shall be set at a position that is easy to see on the flame arrester, indicating the following: a. Name;
b. Model and specification;
c. Manufacturer's name or factory mark;
d. Manufacturing date and number.
3.2 Product certificate
Each flame arrester shall be accompanied by a product certificate, indicating the following: a. Name;
b. Model and specification;
c. Gas flow and pressure drop;
d. Product fire resistance;
e. Manufacturer name;
f. Date of manufacture and serial number. wwW.bzxz.Net
Additional remarks:
This standard was proposed by the Ministry of Public Security of the People's Republic of China and drafted by the Tianjin Fire Science Research Institute of the Ministry of Public Security, the Beijing Design Institute of China Petrochemical Corporation and the Fushun Petroleum Machinery Factory of the Ministry of Petroleum. The main drafters of this standard are Song Xudong, Guo Yitian, Zhao Dalin, Zheng Xuezhi and Chang Guanjie. 326
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