HG/T 2353.6-1992 Bubble pressure test method for filter elements for magnetic slurry filtration HG/T2353.6-1992 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Filter Elements for Magnetic Slurry Filtration
Bubbling Pressure Test Methodwww.bzxz.net
Subject Content and Scope of Application
HG/T2353.692
This standard specifies the bubbling pressure test method for filter elements for magnetic slurry filtration. This method is a simple method for indirectly evaluating the filtration performance of filter elements and can be used as a routine inspection of filter element quality. After the filtration accuracy is determined by the particle passing method, this test method can be used to measure its bubbling pressure value and use it to represent the filtration accuracy. This standard is applicable to filter elements for magnetic slurry filtration in the magnetic recording material industry and also to filter elements for other liquid filtration. 2 Reference Standards
GJB420 Classification of Solid Contamination in Aircraft Hydraulic Systems 3 Summary of Methods
This method is based on physical phenomena and achieves the purpose of measuring the pressure required when the wet microporous structure is replaced by the non-wet microporous structure, thereby characterizing the characteristic size of the micropores.
The filter element is made of porous material. The size of the micropores in the filter layer can be calculated using the pressure value of the inner ventilation and the outer bubbling. 4 Test device and test fluid
4.1 Test device
According to the working principle shown in Figure 1, prepare the tester (i.e. the filter element bubbling tester). The pressure gauge used should not be lower than Class 1.5, and all measuring instruments should be qualified for metrological verification.
Figure 1 Principle of filter element bubbling pressure test
1-Test tank and test liquid; 2--Filter element to be tested; 3-Purified air filter; 4-Pressure reducing valve; 5-Barometer; 6-Micropressure gaugeApproved by the Ministry of Chemical Industry of the People's Republic of China on July 20, 199222
Standard implemented on March 1, 1993
4.2 Test relies on
HG/T2353.6-92
Please use isopropyl alcohol below level 7 in the A grading system of GJB420. Water, gasoline and other liquids with unstable surface tension are not allowed to be used as test liquids. 4.3 Environment
The number of dust particles larger than 0.5um in the air shall not exceed 3500 per liter: the number of dust particles larger than 5um shall not exceed 23 per liter, and the room temperature shall be normal sea level. It is permitted to use clean rooms of the same cleanliness level as that of this standard as specified in other standards. 5. Test Procedure
5.1 The filter element to be tested should be cleaned before testing. The cleaning agent is the clean isopropyl alcohol specified in Article 4.2. If gasoline or other cleaning agents are used for cleaning, the cleanliness should comply with the provisions of Article 4.2. After cleaning, it should be fully evaporated. 5.2 The ventilation pipe is connected to the filter element. Ventilation should be conducted from the inside of the filter element to ensure that there is no air leakage at both ends of the filter element. The length of the ventilation probe inserted into the filter element should be appropriate. If the filter element is too long, several small holes can be evenly drilled on the wall of the probe tube to ensure that the gas introduced is evenly distributed in the inner cavity of the filter element. 5.3 The test liquid level is 13mm from the highest point of the filter element. Before the test, the filter element should be immersed in the test liquid for 20~30mi to achieve full infiltration.
5.4 Test start
5.4.1 Turn on the air source and allow the air flow to pass through the air filter to clean it and reduce the water content. 5.4.2 Adjust the air pressure to below 0.1 MPa.
5.4.3 Adjust the pressure reducing valve (4), slowly rotate the filter element to be tested and observe the first bubble overflowing from the filter element surface. When the first bubble overflows the liquid surface, record the pressure value of the micromanometer (MPa). 5.4.4 Repeat the operation of 5.4.3 until the bubble point pressure is confirmed to be stable at a value. 6 Determine the pore size
The first bubble point represents the maximum pore size of the filter layer, and the group bubble point represents the general pore size of the filter layer. The pore size can be calculated from the bubble point pressure and the surface tension of the test liquid.
Where D-pore size m:
S-surface tension at different temperatures, N/m;
P-bubble point pressure, MPa.
Additional remarks:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Ministry of Chemical Industry's magnetic recording material standardization technology unit. This standard was jointly drafted by the Tenth Design Institute of the Ministry of Machinery and Electronics Industry, the 116th Factory of the Ministry of Aviation and Aerospace Industry, and the Shanghai Xinjing Filtration Equipment Factory. The main drafter of this standard is Dai Tianyi.
This standard refers to the aerospace standard ARP901 "Bubble Pressure Test Method" recommended by the American Society of Automotive Engineers. 23
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