[Mobile Equipment Technology Edition] Daily Question 20180301 Common faults in refrigeration systems (9.10)
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This post was last edited by YORK Industrial Refrigeration on 2018-3-5 08:21. From now on, in order to strengthen exchanges among friends, we have launched a [Daily Question] activity in the Animal Equipment Technology Edition. We hope that everyone will actively participate and make progress and improve together! ! ! award: Actively participate in 3 points of wealth, answer intact 10-15 wealth. This question is valid for two days. There will be no pre-scoring for more than two days. As mentioned in the previous article, the sealing test after compressor overhaul. If the unit (large system) needs to conduct a sealing test, how to conduct it? For large systems, maintain pressure in sections, and pressurize to 3 kg, 6 kg, 8 kg in sequence until the system's working pressure is reached. Check whether the system pressure changes in sections. No change in pressure indicates that the system has good sealing. ============================== Premium promotion: Moving equipment---York screw compressor maintenance process https://bbs.hcbbs.com/thread-1806833-1-1.html Moving equipment---York Quantum control center upgrade https://bbs.hcbbs.com/thread-1804837-1-1.html Moving equipment---GEA Grasso screw compressor overhaul https://bbs.hcbbs.com/thread-1800467-1-1.html Moving equipment---Howden screw compressor disassembly and maintenance in the UK https://bbs.hcbbs.com/thread-1832529-1-1.html Moving equipment---Japanese Maekawa MYCOM screw compressor disassembly and maintenance https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
airtight. Use nitrogen-filled airtight.
Fill the compressor with 1MPa nitrogen or dry air, and keep the pressure drop after 24 hours not greater than 1% of the test pressure.
To test the airtightness of a large system, first determine the range involved in the airtightness, then seal the range and fill it with nitrogen or engineering air (if the refrigerant is not completely emptied during maintenance, refrigerant can also be used). The airtightness pressure is determined based on the working pressure of the system, and then leaks are detected and dealt with. After completion, the pressure is pressed to the maintaining pressure and maintained for the specified time.
Fill the compressor with 1MPa nitrogen or dry air, and keep the pressure drop no greater than 1% of the test pressure after 24 hours.
To test the airtightness of a large system, first determine the range involved in the airtightness, then seal the range and fill it with nitrogen or engineering air (if the refrigerant is not completely emptied during maintenance, refrigerant can also be used). The airtightness pressure is determined based on the working pressure of the system, and then leaks are detected and dealt with. After completion, the pressure is pressed to the maintaining pressure and maintained for the specified time.