JB/T 7219-1994 Cartridge pressure filter element performance test method
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T 7219-1994
Cartridge Pressure Filter
Filter Element Performance Test Method
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Subject Content and Scope of Application
Cited Standards
Bubble Pressure
Filter Element Flow
Apparent Dirt Holding Capacity
Compressive Strength
Rated Axial Load
Flow Fatigue Strength
Comparison Capacitance
One-pass method
Multiple-pass methodwww.bzxz.net
Appendix A
Appendix B
One-pass method for evaluating filter element performance of cartridge pressure filter (supplement)Multiple-pass method for evaluating filter element performance of cartridge pressure filter (supplement)5
Mechanical Industry Standard of the People's Republic of China
Cartridge pressure filter
Filter element performance test method
Subject content and scope of application
This standard specifies the performance test method for cartridge pressure filter element. JB/T7219-1994
This standard applies to cartridge pressure filter elements and also to other types of liquid filter elements. Reference standards
GJB420
JB/T7218
HB 5931.8
3 Terms
3.1 Pollution concentration
Aircraft hydraulic system pollution test-sampling container cleaning method identification Aircraft hydraulic system pollution test-automatic particle counter calibration Aircraft hydraulic system pollution test-determination of solid particle contamination by automatic particle counter Aircraft hydraulic system pollution test-determination of solid particle contamination by microscope counting method Aircraft hydraulic system pollution test-contamination analysis report form Aircraft hydraulic system oil solid contamination classification cartridge pressure filter element
Aircraft hydraulic system pollution test-determination of working fluid solid contamination by microscope comparison method The number of particles of the specified size contained in each 100mL test liquid. 3.2
Weight contamination
The contamination of solid particles in the test liquid expressed in mg/L. Rated pressure drop
Pressure drop specified in the filter element technical conditions.
3.4 Filtration ratio
The ratio of the number of particles before filtration to the number of particles after filtration. 3.5
One-pass method
A test method in which the test liquid does not circulate after passing through the filter element. 3.6 Multiple-pass method
A test method in which the test liquid keeps the flow and contamination level unchanged while passing through the filter element. 4
Bubble pressure
1 Method overview
Immerse the filter element in the test liquid, ventilate from the inside of the filter element, and measure the instantaneous bubble pressure when bubbling occurs on the outside. Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
4.2 Test device and test liquid
4.2.1 Test device
JB/T72191994
The bubbling pressure test device is shown in Figure 1. The accuracy of the pressure gauge used should not be less than 0.4 level, and the minimum scale value of the micromanometer is 1Pa. Apparatus
Figure 1 Schematic diagram of filter element bubbling pressure test device 1-test tank and test liquid; 2-filter element to be tested; 3-air filter; 4-pressure reducing gauge; 5-barometer; 6-micromanometer: 7-vent pipe 4.2.2 Test liquid
Isopropyl alcohol below level 7 in the A classification system of GJB420. Water, gasoline and other liquids with unstable surface tension are not allowed to be used as test liquid. 4.2.3 Environment
The dust particles larger than 0.5um in the air should not exceed 3500/L; the dust particles larger than 5um should not exceed 23/L. The room temperature is normal temperature. The isopropyl alcohol gas content in the ambient air should be controlled. 4.3 Test procedure
4.3.1 Clean the filter element before the test. The cleaning agent is the test liquid. If gasoline or other cleaning agents are used, they should comply with the provisions of the A classification system 7 in GJB420. After cleaning, they should be fully evaporated. 4.3.2 The vent pipe is connected to the filter element to ensure that there is no air leakage at both ends of the filter element. The length of the vent pipe inserted into the filter element should be appropriate. 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 20~30min to achieve full infiltration. 4.3.3
Open the gas source and adjust the air pressure to 0.1MPa. Adjust the pressure reducing valve 4, slowly rotate the filter element to be tested, and observe and record the micro-pressure value when the filter element emits the first bubble. Repeat the operation in 4.3.5 until it is confirmed that the pressure at the bubbling point is stable at a value. 5 Filter element flow
5.1 Method overview
Measure and record the volume of liquid passing through the filter element per unit time under the conditions of a pressure drop of 0.014MPa and a temperature of 20±2℃. 5.2 Test device and test fluid
5.2.1 Test device
The filter element flow test device is shown in Figure 2.
JB/T7219—1994
Figure 2 Schematic diagram of filter element flow test device
1—tank; 2—pump; 3—throttle valve; 4—filter; 5—pressure gauge; 6—thermometer; 7—radiator; 8—flow meter The bottom of the storage tank is 60°～90°conical. The pump should be installed on the pipeline near the bottom of the storage tank, with a pressure range of 0～0.4MPa and a flow rate of 0～100L/min. The pressure gauge range is 0～0.4MPa and the accuracy is 0.4 level. The installation position of the inlet pressure gauge should be at least four times the inner diameter of the pipe from the filter inlet; the installation position of the outlet pressure gauge should be at least 10 times the inner diameter of the pipe from the filter outlet. The thermometer range is 0～100℃ and the accuracy is 1℃. The flow meter range is 0-100L/min, and the accuracy is 1.5 level. The inlet installation position of the flow meter should be at least 25 times the inner diameter of the pipe from the filter inlet.
5.2.2 Test liquid
Use drinking water or YH-10 aviation hydraulic oil. The volume of the test liquid should meet the test requirements. 5.3 Test procedure
5.3.1 Cleaning test system
Fill the storage tank with test liquid, purify the test system with a non-tested filter element with a nominal filtration accuracy of 5μm, and remove the filter element after 30 minutes. 5.3.2 Determine the filter cartridge pressure drop △Po
Start pump 2 and adjust valve 3 to allow the test liquid to pass through the filter cartridge without a filter element at a flow rate of 5L/min. Record the temperature, flow rate and pressure drop at this time, and use this as the first test value of the filter cartridge pressure drop. Then increase the flow rate through the filter cartridge by 5L/min, and measure the pressure difference under the corresponding flow rate. Measure eight points in total, measure twice according to the above method, and take the arithmetic mean of the two measured values. 5.3.3 Determine the filter pressure drop △p
Install the filter element to be tested into the filter cartridge.
Measure the pressure drops of the filter according to the measurement steps in Article 5.3.2, and take the arithmetic mean. 5.4 Determination of filter flow
5.4.1 Calculate the filter element pressure drop △p
The filter element pressure drop is calculated according to the following formula:
Where: △p,—filter pressure drop, MPa; △po—filter cartridge pressure drop, MPa.
JB/T7219-1994
Ap = Api - Apo
5.4.2 Draw a flow rate and pressure drop curve. Determine the flow rate of the filter element at a pressure drop of 0.01 MPa from the flow rate and pressure drop curve. Apparent dirt holding capacity
6.1 Method overview
When the test liquid passes through the filter element at the rated filter element flow rate, add the test powder to the test liquid until the filter element pressure drop reaches the rated value and stop the test. Count the cumulative amount of test powder added. 6.2 Test device and materials
6.2.1 Test device
The filter element apparent dirt holding capacity test device is shown in Figure 3. Figure 3 Schematic diagram of the filter element apparent dirt holding capacity test device 1-storage tank; 2-pump; 3-throttle valve; 4 filter; 5-pressure gauge; 6-flow meter; 7-powder adder; 8-agitation device The bottom of the storage tank is 60°
90°conical, the end of the return pipe is equipped with a nozzle, and the storage tank is equipped with an agitator 8. The pressure gauge has an accuracy of 0.4. 6.2.2 Test materials
6.2.2.1 Test fluid: drinking water or YH-10 aviation hydraulic oil. 6.2.2.2 Test powder: ACFTD test powder or other equivalent test powder. 6.3 Test procedure
6.3.1 Cleaning test system
Inject the test fluid into the storage tank and purify the system with a non-tested filter element with a nominal filtration accuracy of 5μm. Remove the filter element after 30 minutes. 6.3.2 Install the tested filter element into the filter cartridge.
Start the pump and adjust the regulating valve so that the test fluid circulates through the filter element at the specified flow rate. 4
JB/T7219-1994
6.3.4 Add 5g of the test powder into a paste and add it to the test tank. When the pressure drop at the inlet and outlet of the filter is close to 80% of the rated value, reduce the amount of each addition to 1g. Stop the test when the pressure drop at the inlet and outlet of the filter reaches the rated value. 6.4 Calculation of apparent dirt holding capacity
Calculate the cumulative amount of test powder added from the test record sheet. This amount is the apparent dirt holding capacity of the filter element. 7 Pressure resistance
7.1 Method overview
The test liquid flows from the outside of the filter element to the inside. When the pressure difference of the filter element reaches the specified test value, check the degree of damage to the filter element. 7.2 Test device and test liquid
7.2.1 Test device
The filter element pressure resistance test device is shown in Figure 4. Figure 4 Schematic diagram of filter element pressure resistance test device 1-tank; 2-pump; 3-throttle valve; 4-filter; 5-pressure gauge The pump pressure difference range is 0~1MPa, and the flow rate is 0~40L/min. The pressure gauge range is 0～1MPa, and the accuracy is 0.4 grade. The installation position of the inlet pressure gauge should be at least four times the inner diameter of the pipe from the filter inlet; the installation position of the outlet pressure gauge should be at least 10 times the inner diameter of the pipe. 7.2.2 Test fluid
Use drinking water or YH-10 aviation hydraulic oil. 7.3 Test procedure
7.3.1 Install the filter element to be tested into the filter cartridge.
7.3.2 High viscosity test fluid or test powder can be used, or the surface of the filter element can be pre-blocked to establish pressure drop. No matter which method is used, it should not affect the strength of the filter element. 7.3.3 Start the pump and adjust valve 3 to increase the inlet pressure of the filter slowly. When the pressure drop of the filter element reaches 1.25 times the rated value, maintain the pressure for 5 minutes and stop the test. After removing the filter element for cleaning, perform the bubbling pressure test. 7.4 Determination of compressive strength
If the filter element is qualified in the test, the compressive strength of the filter element is 0.8 times the test pressure. 8
Rated axial load
8.1 Test device
JB/T72191994
A suitable weight or loading device used to apply axial force. 8.2 Test procedure
8.2.1 Carry out a bubble pressure test on the filter element and perform a hot soak in accordance with the requirements of the relevant provisions of Chapter 10. 8.2.2 After 72 hours of hot soaking, cool the filter element to room temperature and apply the rated axial force for 5 minutes. 8.3 Determination of rated axial load
After the rated axial load test, determine the filter element structure, seal, and medium damage in accordance with the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test apparatus
The flow fatigue test apparatus is shown in Figure 5. Injection of pollutants
Alternative options for injecting pollutants
Figure 5 Schematic diagram of the flow fatigue test apparatus 1-Busy tank; 2-Nozzle; 3-Pump; 4-Relief valve; 5-Solenoid valve; 6-Thermometer; 7-Pressure gauge; 8-Filter; 9-Flowmeter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue test apparatus (see Figure 5). When the test temperature range is 15-50℃, measure and record the empty filter housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. + At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add pollutants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow through the filter element is from 0 (L/s) to the rated value of the flow, and then drops to 0 (L/s). By changing the flow, the maximum pressure drop in each cycle is limited to within 10% of the rated pressure drop. Limit the cycle frequency to below 1Hz. 9.2.7 Draw a pressure drop versus time curve for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal, and medium damage of the filter element shall be accepted according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, after the filter element is immersed in the filtered liquid, the filter element performance changes are tested. 2 Test liquid and test equipment
10.2.1 Test liquid
The test liquid is the liquid to be filtered.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the filter element to be tested in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element and dry it. 10.4
Compatibility determination
After the filter element to be tested is immersed in the specified time and temperature, test and determine the structure, seal and medium damage of the filter element according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method for evaluating the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method for evaluating the performance of cartridge filter elements, see Appendix B (Supplement). 7
A1 Materials and apparatus
A1.1 Test powders
JB/T7219—1994
Appendix A
Cartridge filter
One-pass method for evaluating the performance of filter elements
(Supplement)
Choose one of the following test powders, or other powders that meet the test requirements. a. ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
Use any liquid that is compatible with the test filter element and that has good suspension properties when mixed with the test powder, such as oil, water and glycerin mixture, etc. After filtration, the cleanliness level should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be Class 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-Test liquid container; 2-Pump; 3, 4-Pressure gauge; 5-Test filter; 6, 7-Sampling valve Filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 Sampling container
The volume is 250mL, and all technical requirements should 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 is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any of the following measuring instruments. A1.6.1 Automatic particle counter
a. Automatic particle counter based on light shielding principle;
b. Automatic particle counter based on resistance principle;
c. Scanning electron microscope.
Automatic particle counters should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. When there are differences in test data due to different instruments, the particle counter based on light shielding principle shall prevail. A1.6.2 Manual particle counter
Apparatus or other instruments that meet the requirements of GJB380.5. A2 Test procedure
A2.1 Preparation of test solution
A2.1.1 Take the cleaning solution specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.1, and stir continuously. The total amount and concentration of the prepared test solution should be compatible with the counting method, test filter element specifications and sampling device. A2.1.2 To make the test powder evenly suspended, vibration, dynamic and ultrasonic methods can be used. This process should avoid secondary contamination. A2.2 Cleaning the sampling system and filter element4 Apparent dirt holding capacity calculation
Calculate the cumulative amount of test powder added from the test record sheet. This amount is the apparent dirt holding capacity of the filter element. 7 Pressure resistance
7.1 Method overview
The test liquid flows from the outside of the filter element to the inside. When the pressure difference of the filter element reaches the specified test value, check the damage of the filter element. 7.2 Test device and test liquid
7.2.1 Test device
The filter element pressure resistance test device is shown in Figure 4. Figure 4 Schematic diagram of filter element pressure resistance test device 1-storage tank; 2-pump; 3-throttle valve; 4-filter; 5-pressure gauge The pump pressure difference range is 0~1MPa, and the flow rate is 0~40L/min. The pressure gauge range is 0~1MPa, and the accuracy is 0.4 level. The installation position of the inlet pressure gauge should be at least four times the inner diameter of the pipe from the filter inlet; the installation position of the outlet pressure gauge should be at least 10 times the inner diameter of the pipe. 7.2.2 Test fluid
Use drinking water or YH-10 aviation hydraulic oil. 7.3 Test procedure
7.3.1 Install the filter element to be tested into the filter cartridge.
7.3.2 Use high viscosity test fluid or add test powder, or pre-block the surface of the filter element to establish a pressure drop. No matter which method is used, it should not affect the strength of the filter element. 7.3.3 Start the pump and adjust valve 3 to increase the inlet pressure of the filter slowly. When the pressure drop of the filter element reaches 1.25 times the rated value, maintain the pressure for 5 minutes and stop the test. After removing the filter element for cleaning, perform a bubbling pressure test. 7.4 Determination of pressure resistance
If the filter element test is qualified, the pressure resistance of the filter element is 0.8 times the test pressure. 8
Rated axial load
8.1 Test device
JB/T72191994
A suitable weight or loading device used to apply axial force. 8.2 Test procedure
8.2.1 Carry out a bubble pressure test on the filter element and perform a hot soak in accordance with the requirements of the relevant provisions of Chapter 10. 8.2.2 After 72 hours of hot soaking, cool the filter element to room temperature and apply the rated axial force for 5 minutes. 8.3 Determination of rated axial load
After the rated axial load test, determine the damage to the filter element structure, seal, and medium in accordance with the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test device
The flow fatigue characteristics test device is shown in Figure 5. Injection of contaminants
Alternative points for injection of contaminants
Figure 5 Schematic diagram of the flow fatigue characteristics test device 1-busy tank; 2-nozzle; 3-pump; 4-relief valve; 5-solenoid valve; 6-thermometer; 7-pressure gauge; 8-filter; 9-flow meter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue characteristics test device (see Figure 5). At the test temperature range of 15 to 50°C, measure and record the empty filter housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. +At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add contaminants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow rate through the filter element is from 0 (L/s) to the rated value of the flow rate, and then drops to 0 (L/s). By changing the flow rate, the maximum pressure drop in each cycle is limited to within 10% of the rated pressure drop. The cycle frequency is limited to less than 1Hz. 9.2.7 Draw a curve of the relationship between pressure drop and time for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal, and medium damage of the filter element are accepted according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, the filter element is immersed in the filtered liquid and the change in the filter element performance is detected. 2 Test liquid and test equipment
10.2.1 Test liquid
The test liquid adopts the filtered liquid.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the filter element to be tested in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element and dry it. 10.4
Compatibility determination
After the filter element to be tested is immersed for the specified time and temperature, test and determine the structure, seal and medium damage of the filter element according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method for evaluating the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method for evaluating the performance of the filter element of a cartridge pressure filter, see Appendix B (Supplement). 7
A1 Materials and equipment
A1.1 Test powder
JB/T7219—1994
Appendix A
Cartridge pressure filter
One-pass method for evaluating filter element performance
(Supplement)
Choose one of the following test powders, or select other powders that meet the test requirements. a. ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
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 should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be Class 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-test liquid container; 2-pump; 3, 4-pressure gauge; 5-test filter; 6, 7-sampling valve filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 Sampling container
The volume is 250mL, and all technical requirements should 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 level of the sampling container is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any of the following measuring instruments. A1.6.1 Automatic particle counter
a. Automatic particle counter based on light shielding principle;
b. Automatic particle counter based on resistance principle;
c. Electronic scanning microscope.
The automatic particle counter should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. When there is a difference in the test data due to different instruments, the particle counter based on light shielding principle shall prevail. A1.6.2 Manual particle counter
Instruments or other instruments that comply with the provisions of GJB380.5. A2 Test procedure
A2.1 Preparation of test solution
A2.1.1 Take the cleaning solution specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.1, and stir continuously. The total amount and concentration of the prepared test solution should be compatible with the counting method, test filter element specifications and sampling device. A2.1.2 In order to make the test powder evenly suspended, vibration, dynamic and ultrasonic methods can be used. This process should avoid secondary contamination. A2.2 Cleaning the sampling system and filter element4 Apparent dirt holding capacity calculation
Calculate the cumulative amount of test powder added from the test record sheet. This amount is the apparent dirt holding capacity of the filter element. 7 Pressure resistance
7.1 Method overview
The test liquid flows from the outside of the filter element to the inside. When the pressure difference of the filter element reaches the specified test value, check the damage of the filter element. 7.2 Test device and test liquid
7.2.1 Test device
The filter element pressure resistance test device is shown in Figure 4. Figure 4 Schematic diagram of filter element pressure resistance test device 1-storage tank; 2-pump; 3-throttle valve; 4-filter; 5-pressure gauge The pump pressure difference range is 0~1MPa, and the flow rate is 0~40L/min. The pressure gauge range is 0~1MPa, and the accuracy is 0.4 level. The installation position of the inlet pressure gauge should be at least four times the inner diameter of the pipe from the filter inlet; the installation position of the outlet pressure gauge should be at least 10 times the inner diameter of the pipe. 7.2.2 Test fluid
Use drinking water or YH-10 aviation hydraulic oil. 7.3 Test procedure
7.3.1 Install the filter element to be tested into the filter cartridge.
7.3.2 Use high viscosity test fluid or add test powder, or pre-block the surface of the filter element to establish a pressure drop. No matter which method is used, it should not affect the strength of the filter element. 7.3.3 Start the pump and adjust valve 3 to increase the inlet pressure of the filter slowly. When the pressure drop of the filter element reaches 1.25 times the rated value, maintain the pressure for 5 minutes and stop the test. After removing the filter element for cleaning, perform a bubbling pressure test. 7.4 Determination of pressure resistance
If the filter element test is qualified, the pressure resistance of the filter element is 0.8 times the test pressure. 8
Rated axial load
8.1 Test device
JB/T72191994
A suitable weight or loading device used to apply axial force. 8.2 Test procedure
8.2.1 Carry out a bubble pressure test on the filter element and perform a hot soak in accordance with the requirements of the relevant provisions of Chapter 10. 8.2.2 After 72 hours of hot soaking, cool the filter element to room temperature and apply the rated axial force for 5 minutes. 8.3 Determination of rated axial load
After the rated axial load test, determine the damage to the filter element structure, seal, and medium in accordance with the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test device
The flow fatigue characteristics test device is shown in Figure 5. Injection of contaminants
Alternative points for injection of contaminants
Figure 5 Schematic diagram of the flow fatigue characteristics test device 1-busy tank; 2-nozzle; 3-pump; 4-relief valve; 5-solenoid valve; 6-thermometer; 7-pressure gauge; 8-filter; 9-flow meter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue characteristics test device (see Figure 5). At the test temperature range of 15 to 50°C, measure and record the empty filter housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. +At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add contaminants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow rate through the filter element is from 0 (L/s) to the rated value of the flow rate, and then drops to 0 (L/s). By changing the flow rate, the maximum pressure drop in each cycle is limited to within 10% of the rated pressure drop. The cycle frequency is limited to less than 1Hz. 9.2.7 Draw a curve of the relationship between pressure drop and time for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal, and medium damage of the filter element are accepted according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, the filter element is immersed in the filtered liquid and the change in the filter element performance is detected. 2 Test liquid and test equipment
10.2.1 Test liquid
The test liquid adopts the filtered liquid.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the filter element to be tested in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element and dry it. 10.4
Compatibility determination
After the filter element to be tested is immersed for the specified time and temperature, test and determine the structure, seal and medium damage of the filter element according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method for evaluating the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method for evaluating the performance of the filter element of a cartridge pressure filter, see Appendix B (Supplement). 7
A1 Materials and equipment
A1.1 Test powder
JB/T7219—1994
Appendix A
Cartridge pressure filter
One-pass method for evaluating filter element performance
(Supplement)
Choose one of the following test powders, or other powders that meet the test requirements. a.ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
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 should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be Class 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-test liquid container; 2-pump; 3, 4-pressure gauge; 5-test filter; 6, 7-sampling valve filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 The sampling container
The volume is 250mL, and all technical requirements should 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 level of the sampling container is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any of the following measuring instruments. A1.6.1 Automatic particle counter
a. Automatic particle counter based on light shielding principle;
b. Automatic particle counter based on resistance principle;
c. Scanning electron microscope.
The automatic particle counter should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. When there is a difference in the test data due to different instruments, the particle counter based on light shielding principle shall prevail. A1.6.2 Manual particle counter
Instruments or other instruments that comply with the provisions of GJB380.5. A2 Test procedure
A2.1 Preparation of test solution
A2.1.1 Take the cleaning solution specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.1, and stir continuously. The total amount and concentration of the prepared test solution should be compatible with the counting method, test filter element specifications and sampling device. A2.1.2 In order to make the test powder evenly suspended, vibration, dynamic and ultrasonic methods can be used. This process should avoid secondary contamination. A2.2 Cleaning the sampling system and filter elementLevel 4. The installation position of the inlet pressure gauge should be at least four times the inner diameter of the pipe from the filter inlet; the installation position of the outlet pressure gauge should be at least 10 times the inner diameter of the pipe. 7.2.2 Test fluid
Use drinking water or YH-10 aviation hydraulic oil. 7.3 Test procedure
7.3.1 Install the filter element to be tested into the filter cartridge.
7.3.2 High-viscosity test fluid or test powder can be used, or the surface of the filter element can be pre-blocked to establish a pressure drop. Regardless of the method used, the strength of the filter element should not be affected. 7.3.3 Start the pump and adjust valve 3 to increase the inlet pressure of the filter slowly. When the filter element pressure drop reaches 1.25 times the rated value, maintain the pressure for 5 minutes and stop the test. After removing the filter element for cleaning, perform a bubbling pressure test. 7.4 Determination of pressure resistance
If the filter element test is qualified, the pressure resistance of the filter element is 0.8 times the test pressure. 8
Rated axial load
8.1 Test device
JB/T72191994
A suitable weight or loading device used to apply axial force. 8.2 Test procedure
8.2.1 Carry out a bubble pressure test on the filter element and perform a hot soak in accordance with the requirements of the relevant provisions of Chapter 10. 8.2.2 After 72 hours of hot soaking, cool the filter element to room temperature and apply the rated axial force for 5 minutes. 8.3 Determination of rated axial load
After the rated axial load test, determine the damage to the filter element structure, seal, and medium in accordance with the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test device
The flow fatigue characteristics test device is shown in Figure 5. Injection of contaminants
Alternative points for injection of contaminants
Figure 5 Schematic diagram of the flow fatigue characteristics test device 1-busy tank; 2-nozzle; 3-pump; 4-relief valve; 5-solenoid valve; 6-thermometer; 7-pressure gauge; 8-filter; 9-flow meter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue characteristics test device (see Figure 5). At the test temperature range of 15 to 50°C, measure and record the empty filter housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. +At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add contaminants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow through the filter element from 0 (L/s) to the rated value of the flow, and then down to 0 (L/s). By changing the flow, the maximum pressure drop in each cycle is limited to within 10% of the rated pressure drop. Limit the cycle frequency to below 1Hz. 9.2.7 Draw a pressure drop versus time curve for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal, and medium damage of the filter element shall be accepted in accordance with the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, the filter element is immersed in the filtered liquid and the change in the filter element performance is detected. 2 Test fluid and test equipment
10.2.1 Test fluid
The test fluid is the filtered liquid.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the filter element to be tested in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element and dry it. 10.4
Compatibility determination
After the filter element to be tested is immersed for the specified time and temperature, test and determine the structure, seal and medium damage of the filter element according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method for evaluating the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method for evaluating the performance of the filter element of a cartridge pressure filter, see Appendix B (Supplement). 7
A1 Materials and equipment
A1.1 Test powder
JB/T7219—1994
Appendix A
Cartridge pressure filter
One-pass method for evaluating filter element performance
(Supplement)
Choose one of the following test powders, or select other powders that meet the test requirements. a. ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
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 should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be Class 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-test liquid container; 2-pump; 3, 4-pressure gauge; 5-test filter; 6, 7-sampling valve filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 Sampling container
The volume is 250mL, and all technical requirements should 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 level of the sampling container is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any of the following measuring instruments. A1.6.1 Automatic particle counter
a. Automatic particle counter based on light shielding principle;
b. Automatic particle counter based on resistance principle;
c. Electronic scanning microscope.
The automatic particle counter should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. When there is a difference in the test data due to different instruments, the particle counter based on light shielding principle shall prevail. A1.6.2 Manual particle counter
Instruments or other instruments that comply with the provisions of GJB380.5. A2 Test procedure
A2.1 Preparation of test solution
A2.1.1 Take the cleaning solution specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.1, and stir continuously. The total amount and concentration of the prepared test solution should be compatible with the counting method, test filter element specifications and sampling device. A2.1.2 In order to make the test powder evenly suspended, vibration, dynamic and ultrasonic methods can be used. This process should avoid secondary contamination. A2.2 Cleaning the sampling system and filter elementLevel 4. The installation position of the inlet pressure gauge should be at least four times the inner diameter of the pipe from the filter inlet; the installation position of the outlet pressure gauge should be at least 10 times the inner diameter of the pipe. 7.2.2 Test fluid
Use drinking water or YH-10 aviation hydraulic oil. 7.3 Test procedure
7.3.1 Install the filter element to be tested into the filter cartridge.
7.3.2 High-viscosity test fluid or test powder can be used, or the surface of the filter element can be pre-blocked to establish a pressure drop. Regardless of the method used, the strength of the filter element should not be affected. 7.3.3 Start the pump and adjust valve 3 to increase the inlet pressure of the filter slowly. When the filter element pressure drop reaches 1.25 times the rated value, maintain the pressure for 5 minutes and stop the test. After removing the filter element for cleaning, perform a bubbling pressure test. 7.4 Determination of pressure resistance
If the filter element test is qualified, the pressure resistance of the filter element is 0.8 times the test pressure. 8
Rated axial load
8.1 Test device
JB/T72191994
A suitable weight or loading device used to apply axial force. 8.2 Test procedure
8.2.1 Carry out a bubble pressure test on the filter element and perform a hot soak in accordance with the requirements of the relevant provisions of Chapter 10. 8.2.2 After 72 hours of hot soaking, cool the filter element to room temperature and apply the rated axial force for 5 minutes. 8.3 Determination of rated axial load
After the rated axial load test, determine the damage to the filter element structure, seal, and medium in accordance with the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test device
The flow fatigue characteristics test device is shown in Figure 5. Injection of contaminants
Alternative points for injection of contaminants
Figure 5 Schematic diagram of the flow fatigue characteristics test device 1-busy tank; 2-nozzle; 3-pump; 4-relief valve; 5-solenoid valve; 6-thermometer; 7-pressure gauge; 8-filter; 9-flow meter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue characteristics test device (see Figure 5). At the test temperature range of 15 to 50°C, measure and record the empty filter housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. +At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add contaminants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow rate through the filter element is from 0 (L/s) to the rated value of the flow rate, and then drops to 0 (L/s). By changing the flow rate, the maximum pressure drop in each cycle is limited to within 10% of the rated pressure drop. The cycle frequency is limited to less than 1Hz. 9.2.7 Draw a curve of the relationship between pressure drop and time for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal, and medium damage of the filter element are accepted according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, the filter element is immersed in the filtered liquid and the change in the filter element performance is detected. 2 Test liquid and test equipment
10.2.1 Test liquid
The test liquid adopts the filtered liquid.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the filter element to be tested in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element and dry it. 10.4
Compatibility determination
After the filter element to be tested is immersed for the specified time and temperature, test and determine the structure, seal and medium damage of the filter element according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method for evaluating the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method for evaluating the performance of the filter element of a cartridge pressure filter, see Appendix B (Supplement). 7
A1 Materials and equipment
A1.1 Test powder
JB/T7219—1994
Appendix A
Cartridge pressure filter
One-pass method for evaluating filter element performance
(Supplement)
Choose one of the following test powders, or other powders that meet the test requirements. a.ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
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 should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be Class 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-test liquid container; 2-pump; 3, 4-pressure gauge; 5-test filter; 6, 7-sampling valve filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 The sampling container
The volume is 250mL, and all technical requirements should 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 level of the sampling container is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any of the following measuring instruments. A1.6.1 Automatic particle counter
a. Automatic particle counter based on light shielding principle;
b. Automatic particle counter based on resistance principle;
c. Scanning electron microscope.
The automatic particle counter should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. When there is a difference in the test data due to different instruments, the particle counter based on light shielding principle shall prevail. A1.6.2 Manual particle counter
Instruments or other instruments that comply with the provisions of GJB380.5. A2 Test procedure
A2.1 Preparation of test solution
A2.1.1 Take the cleaning solution specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.1, and stir continuously. The total amount and concentration of the prepared test solution should be compatible with the counting method, test filter element specifications and sampling device. A2.1.2 In order to make the test powder evenly suspended, vibration, dynamic and ultrasonic methods can be used. This process should avoid secondary contamination. A2.2 Cleaning the sampling system and filter element3 Determination of rated axial load
After the rated axial load test, the filter element structure, seal, and medium damage shall be determined according to the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test device
The flow fatigue characteristics test device is shown in Figure 5. Injection of pollutants
Alternative options for injecting pollutants
Figure 5 Schematic diagram of flow fatigue characteristics test device 1-busy tank; 2-nozzle; 3-pump; 4-overflow valve; 5-solenoid valve; 6-thermometer; 7-pressure gauge; 8-filter; 9-flow meter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue characteristics test device (see Figure 5). When the test temperature range is 15-50℃, measure and record the filter empty housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. +At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add contaminants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow through the filter element is from 0 (L/s) to the rated value of the flow, and then drops to 0 (L/s). By changing the flow rate, limit the maximum pressure drop in each cycle to within 10% of the rated pressure drop. Limit the cycle frequency to less than 1Hz. 9.2.7 Draw a curve of the relationship between pressure drop and time for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal and medium damage of the filter element shall be accepted according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, the filter element is immersed in the filtered liquid, and the change in the filter element performance is detected. 2 Test liquid and test equipment
10.2.1 Test liquid
The test liquid is the filtered liquid.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the tested filter element in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element, and dry it. 10.4
Compatibility determination
After the tested filter element is immersed in the specified time and temperature, the structure, seal, and medium damage of the filter element are tested and determined according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method to evaluate the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method to evaluate the performance of the filter element of a cartridge pressure filter, see Appendix B (Supplement). 7
A1 Materials and apparatus
A1.1 Test powders
JB/T7219—1994
Appendix A
Cartridge pressure filter
One-pass method to evaluate the performance of the filter element
(Supplement)
Choose one of the following test powders, or select other powders that meet the test requirements. a. ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
Use any liquid that is compatible with the test filter element and can make the particles have good suspension when mixed with the test powder, such as oil, water and glycerin mixture, etc. After filtration, the cleanliness should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be level 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-test liquid container; 2-pump; 3, 4-pressure gauge; 5-test filter; 6, 7-sampling valve Filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 Sampling container
The volume is 250mL, and all technical requirements should 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 is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any of the following measuring instruments. A1.6.1 Automatic particle counter
a. Automatic particle counter based on light shielding principle;
b. Automatic particle counter based on resistance principle;
c. Scanning electron microscope.
Automatic particle counters should be calibrated regularly according to the method specified in GJB380.3 or the instrument manual. When there are differences in test data due to different instruments, the particle counter based on light shielding principle shall prevail. A1.6.2 Manual particle counter
Apparatus or other instruments that meet the requirements of GJB380.5. A2 Test procedure
A2.1 Preparation of test solution
A2.1.1 Take the cleaning solution specified in Article 4.2, add the appropriate amount of test powder specified in Article 4.1, and stir continuously. The total amount and concentration of the prepared test solution should be compatible with the counting method, test filter element specifications and sampling device. A2.1.2 To make the test powder evenly suspended, vibration, dynamic and ultrasonic methods can be used. This process should avoid secondary contamination. A2.2 Cleaning the sampling system and filter element3 Determination of rated axial load
After the rated axial load test, the filter element structure, seal, and medium damage shall be determined according to the technical requirements specified in Chapter 4 and JB/T7218.
9 Flow fatigue strength
9.1 Test device
The flow fatigue characteristics test device is shown in Figure 5. Injection of pollutants
Alternative options for injecting pollutants
Figure 5 Schematic diagram of flow fatigue characteristics test device 1-busy tank; 2-nozzle; 3-pump; 4-overflow valve; 5-solenoid valve; 6-thermometer; 7-pressure gauge; 8-filter; 9-flow meter 9.2 Test procedure
9.2.1 Install the filter housing on the flow fatigue characteristics test device (see Figure 5). When the test temperature range is 15-50℃, measure and record the filter empty housing pressure drop according to the filter element technical conditions. 9.2.2
Install the filter element into the test filter housing. +At the test temperature specified in 9.2.2, adjust the flow rate to the rated value. 9.2.4
Add contaminants to the liquid so that the pressure drop of the filter element reaches the specified rated value. 9.2.5
Perform fatigue test on the filter element according to the specified number of flow fatigue cycles. Each flow fatigue cycle is: the flow through the filter element is from 0 (L/s) to the rated value of the flow, and then drops to 0 (L/s). By changing the flow rate, limit the maximum pressure drop in each cycle to within 10% of the rated pressure drop. Limit the cycle frequency to less than 1Hz. 9.2.7 Draw a curve of the relationship between pressure drop and time for at least one cycle. 6
9.3 Acceptance
JB/T7219-1994
After the flow fatigue strength test, the structure, seal and medium damage of the filter element shall be accepted according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218.
Compatibility
1 Method Overview
Under given conditions, the filter element is immersed in the filtered liquid, and the change in the filter element performance is detected. 2 Test liquid and test equipment
10.2.1 Test liquid
The test liquid is the filtered liquid.
10.2.2 Test equipment
Container for test liquid and constant temperature device.
Test procedure
Immerse the tested filter element in the test liquid, heat it to the specified maximum use temperature, keep the temperature constant for 72 hours, take out the filter element, and dry it. 10.4
Compatibility determination
After the tested filter element is immersed in the specified time and temperature, the structure, seal, and medium damage of the filter element are tested and determined according to the technical requirements specified in Chapter 4, Chapter 7 and JB/T7218. 11
One-pass method
For the one-pass method to evaluate the performance of the filter element of a simple pressure filter, see Appendix A (Supplement). 12
Multiple-pass method
For the multiple-pass method to evaluate the performance of the filter element of a cartridge pressure filter, see Appendix B (Supplement). 7
A1 Materials and apparatus
A1.1 Test powders
JB/T7219—1994
Appendix A
Cartridge pressure filter
One-pass method to evaluate the performance of the filter element
(Supplement)
Choose one of the following test powders, or select other powders that meet the test requirements. a. ACFTD test powder;
bF-9 glass bead powder.
A1.2 Cleaning liquid
Use any liquid that is compatible with the test filter element and can make the particles have good suspension when mixed with the test powder, such as oil, water and glycerin mixture, etc. After filtration, the cleanliness should be less than 800 particles larger than 5um per 100mL. A1.3 Sampling device
The pressure gauge and vacuum gauge used in the sampling device are specified to be level 0.4. A1.3.1 Pressure sampling device
The pressure sampling device is shown in Figure A1.
Figure A1 Schematic diagram of pressure sampling device
1-test liquid container; 2-pump; 3, 4-pressure gauge; 5-test filter; 6, 7-sampling valve Filtration sampling device
The filtration sampling device is shown in Figure A2.
JB/T7219—1994
Figure A2 Schematic diagram of filtration sampling device
1-pre-filtration liquid; 2-test filter element; 3-sampling probe; 4-vacuum bottle; 5-vacuum gauge; 6-vacuum pump; 7-test liquid container The filtration device should ensure that the test liquid is drawn from the upstream of the filter element to the downstream and reaches the filtration bottle. A1.4 Sampling container
The volume is 250mL, and all technical requirements should 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 is that the number of particles larger than 5um in a volume of 100mL should be less than 800. A1.5 Environment
The number of dust particles larger than 0.5um in the air should not exceed 350/L; the number of dust particles larger than 5μm should not exceed 23/L; the room temperature is 18~30℃.
A1.6 Particle counter
It is recommended to use any o
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