Free diagnosis for faults in industrial refrigeration and freezing unit equipment on the industrial cooling network!

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In the golden autumn of October 2011, a refrigeration unit used for compressing propane at a chemical plant in Zhanjiang, Guangdong, suddenly stopped operating, causing chaos at the site. Upon receiving the notification, the equipment manager rushed to the site immediately to investigate the fault. It was found that the unit had stopped due to the intake valves not being fully opened. After cutting off the power supply and reopening the intake valves, the unit started operating normally. However, half an hour later, it stopped again without any apparent reason. The manager checked for the cause once more but was unable to find it, so he sought help from the maintenance team. ​ The next day, an engineer sent by the maintenance provider went to the site to investigate the fault. Upon inspection, it was found that a short circuit in the power supply unit of the control cabinet was the cause of the shutdown; therefore, it was decided to replace the power supply unit. Three days later, once the new unit arrived at the plant, it was replaced by the equipment manager of the chemical plant. However, the unit stopped working again after less than an hour of operation. These repeated shutdowns caused significant losses to the chemical plant’s production, and they also led to dissatisfaction on the part of the plant regarding the technical skills of the equipment manager and the maintenance provider. In the end, it was determined that the cause of the shutdowns was an incorrect model of the power supply unit as well as improper installation. From the case of the chemical plant mentioned above, it can be seen that the lack of professionalism on the part of maintenance personnel and equipment managers is the main reason for the repeated shutdowns of the units. The causes of these shutdowns are mainly as follows; engineers who have the necessary skills can conduct self-checks when such shutdowns occur: 1. The compressor will shut down if it reaches too high or too low temperatures. 2. A rapid increase in the compressor’s exhaust pressure or a malfunction of the safety valve can cause the machine to stop operating. 3. Immediate shutdown will occur if the lubricating oil does not circulate. 4. Severe noise from the rotor or jamming can cause the machine to stop. 5. Overload of the compressor can also cause sudden shutdown. 6. Stopping can also occur if there are abnormalities with the motors or electrical equipment in the control cabinet. The above are the main reasons for shutting down a refrigeration unit; of course, there are also common faults such as shaft seizure, bore scoring, liquid slugging, surging, unresponsive alarm devices, abnormal suction and discharge pressure readings, oil pressure fluctuations, insufficient cooling temperature, overload, and motor burnout. Whether it is single or double-stage screw compressors, or single or multi-stage centrifugal compressors, Gonglenghui has the capability to resolve these common faults. Gonglenghui, whose full name is Shandong Gonglenghui Network Information Technology Co., Ltd., is a professional MRO service company that offers comprehensive services related to industrial refrigeration equipment, including installation, repair, maintenance, cleaning, renovation, and supply of accessories. Our company has over 20 years of experience in the commissioning, maintenance, and major repairs of industrial refrigeration equipment, as well as in supplying hundreds of thousands of spare parts for such equipment. For maintenance, our company utilizes advanced processing technologies and manufacturing methods in the industry. We have a team of 35 engineers with an average of 15 years of experience, and over 1,000 cases of experience in repairing industrial refrigeration equipment; our fault resolution rate is 95%. Meanwhile, in 2012 the team overcame the challenges associated with control systems for refrigeration equipment by developing a PLC-based control system. After years of use in the market, this system has received unanimous approval from customers, as it ensures the safe, efficient, stable, and reliable operation of their equipment. The Industrial Refrigeration Service Center has a 1,200-square-meter compressor remanufacturing workshop, an 800-square-meter control system development workshop, a 600-square-meter parts warehouse, and an 500-square-meter office. It has pioneered an MRO service platform for industrial refrigeration and has built up a large network of repair services and suppliers. The following are maintenance cases for Gonglenghui. In the fall of 2016, the York RXF-39 refrigeration unit in a factory in Binzhou, Shandong Province, suddenly stopped working. The factory turned to a local repair shop to resolve the issue. After investigating, the repair shop determined that the unit had stopped due to a seized rotor. The factory decided to have the rotor repaired by them; however, less than 2 hours after the repaired rotor was installed in the compressor, it seized again. Due to their limited technical capabilities, the repair shop sought help from Gonglenghui. The engineers from Gonglenghui inspected the refrigeration unit and found that, in addition to severe wear on the rotor, there was also serious oil leakage from the shaft seals at a rate of 15 drops per minute, with wear on the bearings as well. If the shaft seals were not replaced and the rotor and bearings were not maintained, further failures would occur. After informing the factory about these safety hazards, the factory decided to let Gonglenghui handle the maintenance work. In less than two weeks, Gonglenghui installed a repaired rotor, new bearings, and new shaft seals in the York RXF-39 refrigeration unit. After 72 hours of operation without any problems, this maintenance effort successfully resolved the issue for the customer, saving them millions in losses. Over the past 5 years, the chemical plant has maintained a good partnership with Gonglenghui. We all know that as industrial refrigeration equipment operates for a long time, it is bound to develop various minor issues such as unusual noises, vibrations, and oil leaks, as well as more serious problems like wear and damage to shaft seals, bearings, and rotors. When we turn to the manufacturer to fix these problems, we end up choosing repair services instead due to factors such as repair costs, turnaround time, availability of spare parts, and after-sales support; yet we then fall victim to the limitations in their technical capabilities. We have been extremely troubled by this, as we have been unable to find a repair provider that offers good value for money and high-quality technical service. To this end, Gonglenghui offers free online fault diagnosis for industrial refrigeration equipment. If you are facing issues with your industrial refrigeration equipment, visit Gonglenghui – experienced engineers will provide you with free online diagnosis on business days, helping you save tens of thousands of yuan in costs. Gonglenghui is confident that you will receive a satisfactory response to each of your fault-related inquiries.