【Mechanical Equipment Technology Edition】Daily Question 20171221: Common Faults in Refrigeration Systems (2.1)
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This post was last edited by YORK Industrial Refrigeration on 2017-12-25 at 08:19. Starting from now, in order to enhance communication among users, a 【Daily Question】 activity has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth points for active participation, 10-15 wealth points for correct answers. This question is valid for two days; no scoring will be given if more than two days pass. If there are flaws in a relatively large system, how should one proceed? Adopt a segmented pressure retention approach, record the data from the pressure gauge, and lock the container on the side where pressure changes occur (to rule out valve leaks). Check the positions of valves, welds, and seals. =============================== High-quality promotions: Mechanical equipment——Summary of work in 2017: Summary of work by equipment managers https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1881872 Mechanical equipment——Maintenance process for York screw compressors https://bbs.hcbbs.com/thread-1806833-1-1.html Mechanical equipment——Upgrade of York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——Major maintenance of GEA Grasox screw compressors https://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment——Disassembly and maintenance of British HOWDEN screw compressors https://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment——Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
Identify gaps in sections through methods such as viewing, listening, and checking； Handle it according to the leakage situation and location
1. Shutdown for emergency repair. 2. Perform plugging under pressure when conditions permit.
The best approach is to turn on the system, apply pressure in stages, identify the leak points, and resolve the issue completely. If the conditions are not sufficient, the refrigerant can be released, and the area with oil present can be rewelded for repair.
In any chemical processing system, any leaks should be addressed promptly. The same should apply in refrigeration systems as well. 1. Correctly identify the location of the leak, then carry out system replacement and isolation to remove any toxic, harmful, flammable, or explosive substances from the system ； 2. Take necessary measures and implement proper safety precautions to prevent personal injury accidents during maintenance work. 3. When performing hot work, obtain a special work permit first ； When entering a tower or working inside a container, it is necessary to obtain a permit for work in a confined space, among other things.
Larger systems have leakage points; it is best to conduct leak detection in segments. After identifying each leakage point separately, appropriate actions can be taken based on the situation.
There’s not much to say about this; it simply involves checking the contacts. In addition to the connections on the pipelines, the equipment itself also needs to be checked for leaks, as well as the instrumentation area, which is often overlooked. Another thing to note is that the welding points must also be checked carefully; some welding defects may not be detected during inspections, and we have encountered cases where there were gaps in the welds. In short, leak detection requires careful attention; every connection must be checked – there is no such thing as priority!
Any leak must be addressed and sealed; the key is to locate the leak first. I believe that if it cannot be detected through visual inspection, the system has to be shut down, and one must use sight, touch, and hearing to identify the issue. If possible, pressure should be applied in sections, and soapy water can be used to find the leaks.