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What is the pressure leak test of the display cooler
author: supermarket refrigerated showcase category: walk-in display coolers Views: 548Time: 2016-08-22
What is the pressure leak test of the display cooler
The pressure leak test is to fill the entire display cooler refrigeration system with a certain pressure of nitrogen or air to pressurize the inner wall of the pipe wall equipment to check the installation Whether there is leakage in joints, flanges, pipes, equipment, etc. In the Freon system, because fluorine has strict requirements on the water content of the system, industrial nitrogen is often used when testing the pressure. Nitrogen has the advantages of non-corrosion, non-moisture, non-flammable and non-explosive, low price, and convenient operation. Try not to use compressed air, because it contains moisture and impurities. It is strictly forbidden to pressurize with oxygen because it is dangerous. In the absence of nitrogen, dry compressed air can also be used to test leaks, that is, a large dryer is installed at the compressed air outlet to minimize the moisture in the compressed air. The air pressure test is carried out by using an air compressor. If the air compressor really cannot be solved, the safety of the compressor should be paid attention to when using the refrigeration compressor to pump air. Leak detection work must be serious and careful. The soapy water used for leak detection must have a certain concentration, and it should not be too thin, otherwise the time of applying it to the inspection site is too short and it is difficult to find the leak. In addition, the method of listening to the sound can also be used to detect leaks, because there will be some faint noises at the leaking place, and the leak can be found when it is quiet. If conditions permit, the inspection site can be placed in the water. This leak detection method is effective. For systems with relatively large display coolers, the method of segmented leak detection can also be used. If the pressure drops during the leak detection process, but the leak cannot be found for a while in the system, the following possibilities should be noted.
(1) The refrigerant side of the condenser is leaking to the water ' there is a leak on one side, and the two ends of the water side cover should be opened for inspection.
(2) If you are overhauling the old system, you should pay attention to whether there is any leakage at the junction of the low-pressure pipeline wrapped in the insulation material.
(3) There may also be leakage on various automatic adjustment equipment and components, such as the bellows of pressure relays.
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