HG/T 2353.1-1992 Method for determination of filtration accuracy of filter elements for magnetic slurry filtration
Some standard content:
Chemical Industry Standard of the People's Republic of China
Filter element for magnetic slurry filtration
Filtration accuracy test method
HG/T2353.1-92
This standard is formulated with reference to the international standard ISO4572-81 "Hydraulic transmission-filter-porous method for evaluating filtration performance". 1 Subject content and scope of application
This standard specifies the filter element filtration accuracy test method. This method includes initial accuracy test and maximum size particle pass test. At the same time, it specifies the method for determining the cleanliness of the filter element itself. This standard is applicable to filter elements for magnetic slurry filtration in the magnetic recording material industry. It is also applicable to filter elements for other liquid filtration. 2 Reference standards
GJB380.1 Aircraft hydraulic system pollution test sampling container cleaning method identification Aircraft hydraulic system pollution test automatic particle counter calibration GJB380.3
Aircraft hydraulic system pollution test using automatic particle counter to determine the solid particle contamination GJB380.4
GJB380.5 Aircraft hydraulic system pollution test using microscope counting method to determine the solid particle contamination GJB420 Aircraft hydraulic system solid contamination classification Aircraft hydraulic system pollution test using microscope comparison method to determine the solid contamination of working fluid HB5931.8
Tube bubble pressure test method
HG2353.6 Filter element for magnetic slurry filtration
3 Terms and codes
The number of particles larger than a certain size in a unit volume of contaminated liquid before filtration, 3.2B value
The number of particles of the same size as value A in a unit volume of contaminated liquid after filtration. 3.3C value
The number of particles that fall off the filter element, that is, the number of particles of the same size as the A value (B value) contained in the unit volume after the clean test liquid passes through the filter element.
During the test, the B value includes the C value,
3.4 Filtration efficiency
The ratio of the number of particles of a certain size that are filtered out to the number of particles of the same size before filtration, that is: n(%)= 4 -(B - C)
Where: A, B, C - namely A value, B value, C value, 3.5 Maximum size particle passing rate
When the filtration efficiency of a certain size particle reaches 99%, the size is the maximum size particle passing rate, approved by the Ministry of Chemical Industry of the People's Republic of China on July 20, 19926
Standard implemented according to the network mo.barcac.con1993-03-01
3.6 Initial filtration accuracy
HG/T-2353.1-92
When the filter element has a filtration efficiency of 95% for a certain size particle, the size is the initial filtration accuracy, 3.7 Dirt Contamination concentration
The number of particles of the specified size contained in every 100mL of test liquid. Method summary
4.1 After the test powder is prepared into a test liquid of a certain concentration in the clean test liquid, it is passed through the filter element under test at a specified flow rate. At this time, the filtration characteristics of the filter element can be obtained from the measurement and statistics of the number of particles of a certain size before filtration and the number of particles of the same size after filtration, that is, the initial filtration accuracy and the maximum size particle passing rate are determined by the specified filtration efficiency. 4.2 When a clean test liquid that meets the requirements is used and passed through the filter element under test at a specified flow rate, the cleanliness of the filter element itself can be obtained from the measurement and statistics of the particle concentration of the test liquid.
Testing equipment and devices
Test powder
Recommend any one of the following test powders, or other test standard powders equivalent to any of them, a. ACFTD test powder
bF-9 test glass bead powder.
The particle size distribution of the two test powders is shown in Figure 1. Standard exchange network.baiowa.com Various standard industry information is free to download. Particles
(μm)
HG/T2353.1-92
Figure 1 Test powder particle size distribution
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Cumulative weight (%)
5.2 Test liquid
HG/T 2353.1
Use any liquid that is compatible with the test filter element and has good suspension properties when mixed with the test powder, such as oil, water and glycerol mixture, etc. After filtration, the cleanliness is less than 800 particles larger than 5μm per 100mL. 5.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are recommended to be level 1.5. All kinds of instrumentation and measuring instruments should be qualified by metrological verification. 5.3.1 Pressure sampling device
The pressure sampling device is shown in Figure 2.
Figure 2 Schematic diagram of pressure sampling device
1 Test liquid container:
5.32 Filtration sampling device
The filtration sampling device is shown in Figure 3,
Pressure gauge:
Test filter;
7 Sampling valve
Figure 3 Schematic diagram of filtration sampling devicebzxz.net
1—Test liquid before filtration: 2—Test filter element; 3—Filtration probe: 4—Vacuum bottle and test liquid after filtration; 5—Vacuum pump The filtration device should ensure that the test liquid is pumped from the upstream of the filter element to the downstream and reaches the filtration bottle. Standards report network,
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HG/T2353.1-92
5.4 Sampling container
The volume is 250mL, and all technical requirements shall comply with the provisions of GJB380.1. If the sampling process and particle analysis are carried out in the same clean room, a wide-mouth container or an ordinary beaker can be used. The cleanliness of the sampling container should be less than 800 particles larger than 5μm in a volume of 100mL, 5.5 Environment
The number of dust particles larger than 0.5um in the air shall not exceed 350 per liter; the number of dust particles larger than 5um shall not exceed 23 per liter; the cleanliness level of the clean room specified by room temperature or other standards with the same requirements. 5.6 Particle counter
It is recommended to use any of the following instruments that can count and measure the solid particles contained in the liquid: 5.6.1 Automatic particle counter
Light-shielding principle automatic particle counter;
b. Resistance principle automatic particle counter;
c. Electronic scanning microscope.
Automatic particle counters should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. 5.6.2 Manual microscope
150× biological microscope (human incident light or transmitted light), or other equivalent manual microscopes. 5.7 Additional instruments
Various instruments that are compatible with the selected particle analysis method. The cleanliness of containers and instruments in contact with the test liquid in the particle analysis methods recommended in this standard, namely GJB380.4, GJB380.5 and HB5931.8, shall comply with the provisions of Article 5.4. 6 Test Procedure
6.1 Preparation of Contaminated Liquid
6.1.1 Take the clean test tube specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.3, and stir continuously. In this process, the contamination concentration per 100mL should be calculated according to the particle distribution of the test powder and the total volume of the test liquid. The contamination concentration should be higher than the pollution level 12 classified by A in GJB420. The total amount of contaminated liquid to be prepared should be determined according to the size of the test filter element and the total volume of the sampling device. 6.1.2 In order to make the test powder evenly suspended, vibration, shaking and ultrasound methods can be used. This process should avoid secondary contamination. 6.2 Cleaning the Sampling System and Filter Element
When using any sampling method, whether pressure or filtration, the system and test filter element should be cleaned with the cleaning solution specified in Article 4.2. When it is confirmed that the liquid flow does not bypass the filter element, turn on the pump to allow the cleaning liquid to pass through the filter element. Take 200mL of each of samples a and b at the downstream of the filter element of the sampling device. This sample is set as the C value.
6.3 Injecting contaminated liquid
6.3.1 Drain the cleaning liquid of the sampling system (including the containing filter shell or container). 6.3.2 Inject contaminated liquid into the sampling system. The pressure sampling method is to inject the contaminated liquid into the test container (Figure 2); the filtration sampling method is to inject the contaminated liquid into the containing test filter (Figure 3). The inner diameter of the filter cartridge should ensure that the gap between the inner wall and the filter element is between 5 and 8 mm. The height of the filter cartridge should be compatible with the length of the filter element being tested. 6.4 Sampling
6.4.1 The pressure sampling method is: open the sampling device. When the net pressure difference between the inlet and outlet of the filter element (excluding the filter housing) is established at 0.014MPa, use two sampling containers to sample the upstream and downstream of the filter element at the same time. The upstream sampling is the A value, and the downstream sampling is the B value. 6.4.2 The filtration sampling method is: before the vacuum pump is turned on, sample the polluted liquid outside the filter element. This sample is the A value; then turn on the vacuum pump. When the vacuum reaches 0.0866MPa, allow the polluted liquid to pass through the filter element to the suction bottle, and sample from the suction bottle. This sample is the B value.
6.4.3 Downstream sampling should ensure that the contaminated liquid does not bypass the filter element. The upstream and downstream sampling processes should avoid secondary contamination of the liquid sample. The sampling volume should not be less than 200mL.
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HG/T2353.192
Use the selected particle counter method to analyze the A, B, C value α samples for predetermined size particles. Depending on the nominal accuracy of the measured filter element, multiple sizes can be analyzed each time and the cumulative number can be counted. For example, greater than 1, 3, 5, 10, 20, 40um, etc. The particle sizes determined by the A value, B value, and C value should correspond to each other. The particle analysis method adopts either GJB380.4 or GJB380.5. 7 Determine the filtration accuracy
7.1 Maximum size particle passing rate
Use the calculation method and definition specified in Articles 3.4 and 3.5 of this standard to determine the maximum size particle passing rate 7.2 Initial filtration accuracy
Use the calculation method and definition specified in Articles 3.4 and 3.6 of this standard to determine the initial filtration accuracy. 8 Determine the cleanliness of the filter element
Measure the number of particles larger than 5~15μm, 15~25μm, 25~50um, 50~100μm and larger than 100μm in each 100mL liquid sample with C value b sample, and then determine the cleanliness grade according to GJB420. 9 Determine the filtration pore size
Determine the maximum pore size corresponding to the maximum size particle passing rate according to HG/T2353.6. The maximum pore size determination is convenient for routine inspection of filter element quality. 10 Repeat the test
When determining the filtration accuracy calculation according to Chapter 6 of this standard, if the filtration efficiency of the selected several sizes of particles does not reach the expected efficiency value, another larger size can be selected for particle analysis and filtration efficiency calculation until the specified efficiency value is reached. 11 Data processing
In order to accurately obtain the filtration efficiency of a certain size of particles, during the particle analysis process, the distribution of the selected several sizes of particles is plotted on the log-log coordinate paper (Figure 4). The interpolation method can be used to obtain the number of particles of another size from the number of particles of two sizes. Standard proposed exchange netom.bzosou.cm Various standard business materials are charged for teaching 10T
HG/T2353.1-92
Solid particle pollution level chart
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8090100
Diameter (μm)
Additional instructions:
HG/T2353.1-92
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 managed by the magnetic recording material standardization technical management unit of the Ministry of Chemical Industry: This standard was drafted by the Tenth Design Institute of the Ministry of Machinery and Electronics Industry, the 116th Factory of the Ministry of Aerospace Industry, and the Shanghai Xinjing Filtration Equipment Factory. The main drafter of this standard is Dai Tianyi.
In addition to referring to international standards, this standard also refers to the American aerospace standard ARP599A and the American Automobile Association standard SAEJ1858.
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