Leak detection of filter system in dust-free purification workshop

Leak detection of filter system in dust-free purification workshop

The purpose of the integrity test of the high-efficiency filtration system in the clean room is to ensure and confirm that the high-efficiency filtration system is installed correctly, mainly to verify that there is no bypass leakage, the filter itself has no defects, and there is no pinhole leakage; the test method is in the high-efficiency filtration system. The aerosol is introduced on the upstream side of the device, ...

Text label: dust-free purification workshop, filter system leak detection

Leak detection of filter system in dust-free purification pharmaceutical cleanroom

The purpose of the integrity test of the high-efficiency filtration system in the clean room is to ensure and confirm that the high-efficiency filtration system is installed correctly, mainly to verify that there is no bypass leakage, the filter itself has no defects, and there is no pinhole leakage; the test method is in the high-efficiency filtration system. The aerosol is introduced on the upstream side of the filter, and the downwind side of the filter and the support frame are immediately scanned. This program is used to detect whether the filter media and frame seal are damaged by small pinholes, and whether the filter frame and gasket have bypass leakage. , and whether the frame of the filter itself leaks; for the ceiling static pressure box, it may be necessary to scan the ceiling penetrations and ceiling joints; leak detection methods are: photometer method, particle counter method. Logarithmic or linear mass concentration detection by photometric method, no discrete quantitative analysis, the test is to introduce DOP, PAO or other specified aerosol upstream of the filter, scan the downwind side of the filter with a photometer and a suitable probe, verify The integrity of the filtration system.

Introduce aerosol to the upstream side of the filter in a way to make the upstream concentration of each filter exposed to the aerosol uniform at the same time. If several or all filters are to be exposed to the aerosol at the same time, it is recommended to Introduce aerosol at the fan inlet, or at a location where uniform concentration is achieved for all filters; measure the aerosol concentration immediately upstream of the filter under test, taking care to ensure uniform aerosol distribution; if a Raskin tip is used Aerosol producer, the air supply pressure is set to at least 138KPa; use a linear or logarithmic photometer to measure the upstream detection aerosol concentration; design the photometer to full scale, and measure the upstream concentration, the obtained concentration value is one or more Ras Gold nozzle, adjust to the value obtained when the aerosol reaches a concentration of 10-20ug/L; once the correct aerosol concentration is obtained, adjust the gain of the photometer again so that the concentration represents 100% of the upstream concentration; increase the sensitivity of the photometer so that the upstream 0.01% of the concentration can be easily read. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for dust-free workshops and purification workshops.

Filter system leak detection, discrete particle counter method, particle filter method to measure the diameter and count of particles, when this leak detection is performed, artificial aerosol is introduced upstream of the filter, and used on the downwind side of the filter. Particle counter scanning to verify the integrity of the filtration system; introducing aerosol into the supply air direction of the filter in such a way that a uniform aerosol concentration is obtained for each filter simultaneously exposed to the aerosol; measuring when the aerosol is introduced Upstream particle concentration, verify that the upstream aerosol concentration is greater than 3.53*107 particles/m3, this concentration will make the scanning speed reasonable, higher concentration will improve the accuracy, and can improve the scanning speed; with the calculated scanning speed, the scanning probe Sweep the surface of the filter and the periphery of the filter assembly in a slightly overlapping formation, so that the entire area of u200bu200bthe filter system is tested. When scanning, the probe is about 25mm away from the tested area. , and where the filter seals with the mounting bracket are additionally scanned.

Installed filter leak detection, total aerosol leakage method, used to verify the integrity of the filter system when it is not possible to access the filter system downwind, significant leakage when the photometric method or particle counter method is used The range can be between 0.005%-0.03%; this test is carried out by introducing the detection aerosol upstream of the filter installed in the air duct and having a certain distance from the clean room, and then measuring the air entering the room from the air duct and comparing it with Compare the upstream concentration to determine the total leakage rate of the filter system; set a position in the air duct at least 10 times the diameter of the air duct from the filter to be tested, use a photometer, set it to a range of 0.03% concentration, and use a probe Measure the aerosol leakage concentration in the air duct and take multiple readings at the plane closest to the filter to determine if the concentration is uniform. At least 5 evenly spaced readings should be obtained. All readings should be within ± If the deviation of a single reading from the average value is greater than ±5%, the aerosol must be introduced in another position to meet the uniformity requirements.

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