The block and tackle was used to winch the refrigerant to the location of the chiller, then the anhydrous ammonia was charged into the system. Therefore, the customer let us know when the system pressure had reached the achievable vacuum pump pressure. The vacuum pressure was being monitored, at intervals, by the customer. A Torr gauge was fitted to the appropriate part of the system using a ¼” hose and 2 fittings to get from one thread type to another. Then, the dehydration process was started. Our engineers used their fittings to connect the vacuum pump, via a hose to the chiller. This unit can cope with a higher amount of moisture removal, therefore removing the need for monitoring during the process. We at Maximus Chillers have an industrial vacuum pump which speeds up the dehydration process. Smaller vacuum pumps need to be repaired, usually each morning, due to the moisture being removed from the system. Therefore, only a small amount of water had entered the refrigerant pipework during the evaporator leak. The standing and running refrigerant pressures are both higher than the water pressure of the Inlet and Outlet pipes. Contact Form Dehydration Process during Ammonia Chiller Repair These readings were witnessed by the customer and recorded on the Pressure Test Certificate which was then filed by the Facilities Manager. Having closed all of the service ports, the entire system was pressure tested, noting the start and the finish readings. Spares are kept on site in the stores- so the oil filter was swapped out. Our Engineer used his socket set to remove the filter housing, then he slid out the oil filter. The oil filter which is fitted to the oil pipe on the compressor was blocked due to the moisture reacting with the ammonia refrigerant and turning into ammonium hydroxide. Then, the bolts were ‘torqued up’ to the correct value according to standard industry guidelines. The end plate was lifted into place and the bolts were fitted. The rebuild was the reverse of the strip down: the plates were collected from the plant room and replaced on the evaporator using the new gaskets. Then, we sent them to site for the rebuild. We made the gasket set in our workshop from raw materials suitable for ammonia. Evaporator Rebuild during Ammonia Chiller Repair The gaskets were found to have deteriorated over time- causing the leak. Then, they were taken to the plant room for storage until the rebuild. The plates were found to be in good condition, so they were cleaned using our plate cleaning agent. Having done this, the plates and gaskets were removed and then inspected. The end plate was unbolted from the rest of the evaporator according to standard industry guidelines. This had not made any difference to how fast the leak was occurring.Įvaporator Strip Down during Ammonia Chiller Repair An attempt had been made to ‘nip’ the evaporator up by tightening the end plate bolts. The leak had been identified as coming from in between the plates along the side of the evaporator. The evaporator on this chiller is a plate heat exchanger. They then opened all of the service valves around the chiller. First, the refrigerant hoses were removed from the pump out unit. They both donned their breathing apparatus and full ammonia resistant PPE. Our engineers then decided to break into the refrigerant system. Therefore, it was drained from the various service ports into drums and then taken away for recycling. The oil used to lubricate the compressor is located in the: By this time, the refrigerant temperature had risen to near ambient temperature. Then, the vapour was removed until the pressure was zero barg. The refrigerant recovery operation was started by removing the ammonia liquid. Having done this, the recovery unit was plugged in and tested. These in place, the extension lead was run out from the adjacent plant room. The plant is located on a roof, so the pump out unit and recovery cylinders were lifted into place with a block and tackle. This was to stop any further leaking of water into the refrigerant system. The water Inlet and Outlet to the plate evaporator had been valved off and then it had been drained down. Used in the plastic machinery industry in batches In 2011, the products were highly recognized by the Plastic Machinery Industry Association and obtained the Strategic Cooperation Supplier certificate issued by the Machinery Equipment Manufacturing Chamber of Commerce in Shunde District, Foshan City, Guangdong Province In 2012, the company’s products were used in large aluminum profiles.An ammonia chiller had been found to need an evaporator repair on a previous call out. In 2010, the company became a qualified supplier of Yizhimi Group and Lijin Group. was established and launched the first domestic high-precision bypass oil filter, which changed the long-term dependence on imports of high-precision bypass oil filters. In 2009, SHENZHEN WONPRO TECHNOLOGY CO.,LTD.
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