Clean room workshop air cleaning system and noise detection

Clean room pharmaceutical cleanroom air cleaning system and noise detection

When testing the cleanliness of the clean room, there should not be more than 3 people, and they must wear clean work clothes that are suitable for the cleanliness level of the clean room. The content of the test includes: cleaning and trial operation of the system; air supply volume of the system , return air volume, fresh air volume, exhaust air volume and return air outlet...

Text label: clean room pharmaceutical cleanroom, air cleaning system detection, noise measurement

Clean room pharmaceutical cleanroom air cleaning system and noise detection

When testing the cleanliness of the clean room, there should not be more than 3 people, and they must wear clean work clothes that are suitable for the cleanliness level of the clean room. The content of the test includes: cleaning and trial operation of the system; air supply volume of the system , Determination and adjustment of return air volume, fresh air volume, exhaust air volume and return air volume; leakage inspection and plugging of air filters; air flow pattern and speed measurement; efficiency measurement of filters at all levels; static pressure measurement; concentration Field measurement; temperature and humidity measurement; noise measurement. The leakage of the filter is due to the leakage between the filter itself or the filter and the frame and the frame itself and the maintenance structure. After the installation of the high-efficiency filter, the leakage detection is usually carried out by a particle counter or a turbidity meter. When leakage is found, Use perchloride glue or No. 88 glue, 703, 704 silica gel to plug and seal; scan along the filter surface, frame and frame joints at a distance of 2-3cm from the filter surface on the downwind side of the filter, when the instrument reading is higher than the high efficiency When the penetration rate of the filter is 10 times, it is considered that there is leakage, and the high-efficiency filter can also be detected by light.

In order to check whether the filter can still maintain the factory filtration efficiency after the filter is installed, the filter efficiency should be measured on site. The dust source in the measurement should be atmospheric dust, and the particle size should be measured by particle counters on the upper and lower wind sides of the filter. Dust concentration ≥0.3, 1.0, 5.0μm, and calculate the filtration efficiency; on-site measurement of the filter can also use oil mist to generate dust, use a turbidimeter to measure the photocurrent on the upper and lower wind sides of the filter, and calculate the filtration efficiency . Clean room air cleaning system filter dust concentration measurement, measuring point layout: work area, general clean room area < 10m2, 1 point, 10-20m2, 2 points, 20-40m2, 5 points; according to the spacing of 0.5-2m Arrange measuring points, the total number of measuring points should not be less than 20, and try to make the measuring points close to the operation center; 1 or 2 measuring points are arranged in the middle of the corridor at a height of 1m from the ground; the distance between the new air outlet and the gate of the system One measuring point is arranged at a height of 1m on the ground. The cleanliness of the clean room should reach the level of normal operation, that is, the dust concentration in the air measured when the staff is operating normally and approaching the working position, that is, the dynamic effect; the test after the completion of the construction is in static conditions , should be converted into dynamic according to the regulations of 'air cleaning technical measuresis the dust concentration under dynamic conditions. The cleanliness level is evaluated according to the technical measures of air cleanliness. In addition to the special requirements of the process, generally it should be a working area with a height of 0.8-1.5m above the ground or the first working area of u200bu200ba horizontal parallel flow clean room. The maximum concentration is the indoor cleanliness. . Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.

The noise measurement of the air-conditioning system mainly measures the A-block sound level, and if necessary, measures the octave frequency spectrum for noise evaluation. The measurement objects are fans, water pumps, refrigeration compressors, mufflers and rooms, etc. The influence of other sound sources is generally carried out at night; the selection of the measuring point should pay attention to placing the microphone in the correct place to improve the accuracy of the measurement. At m, the noise before and after the muffler can be measured in the air duct. For the measurement point of the air-conditioned room, it is generally selected at the center of the room about 1.5m away from the ground; state; pay attention to the influence of reflected sound, the microphone should be 2-3m away from the reflective surface as far as possible; avoid the interference of the background noise on the measurement, if the difference between the sound source noise and the background noise is less than 10dB, the correction due to the drying of the background noise should be deducted When the difference between the two is 6-9dB, subtract 1dB from the measured value, when the difference between the two is 4-5dB, subtract 2dB from the measured value, when the difference between the two is 3dB, subtract 2dB from the measured value Subtract 3dB from it; in order to prevent measurement errors, pay attention to the influence of wind, electromagnetic and vibration; pay attention to the influence of reflected sound, and the microphone should be 2-3m away from the reflecting surface as far as possible.

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