supermarket refrigerated showcase » article > walk-in display coolers > Interpretation of refrigerated showcase commercial refrigeration: The safe operation of commercial refrigeration ammonia equipment and pipelines during maintenance
Interpretation of refrigerated showcase commercial refrigeration: The safe operation of commercial refrigeration ammonia equipment and pipelines during maintenance
author: supermarket refrigerated showcase category: walk-in display coolers Views: 558Time: 2016-08-22
in order to prevent the residual refrigerant in the commercial refrigeration (library) equipment from poisoning or suffocating the operator, especially to avoid ammonia After mixing with air to a certain proportion, there will be problems with open flames, and the Freon refrigerant will decompose highly toxic substances when encountered with open flames. Disassembly is strictly prohibited when the refrigerator is not evacuated or replaced completely and not connected to the atmosphere. Machine or equipment accessories for welding operations. At the same time, it also stipulates that there should be no open flames in the refrigeration room and auxiliary equipment rooms, and open flames are prohibited for heating in winter.
The key link in the maintenance of equipment and pipelines with ammonia is how to safely treat the ammonia in the equipment before welding and repair. Otherwise, the ammonia is not handled properly and accidents will occur during the overhaul. Because when the mixing ratio of ammonia in the air reaches about 25%, it will explode in an open flame. Some of the repaired equipment did not treat the ammonia properly, causing personal injury or death. Therefore, when repairing equipment with ammonia, careful and careful work must be carried out according to the steps to safely complete the repair task. The steps and methods of safe operation are described as follows:
1. Gas masks, rubber gloves, ventilators, rubber water pipes, and temporary first aid items should be prepared before equipment and pipeline maintenance.
2. When repairing high-pressure commercial refrigeration (library) equipment, the basic principle of handling ammonia is: first, stop the compressor and collect the ammonia in the low-pressure equipment (such as drain barrels, circulation barrels). Most of them are discharged into the ammonia tank outside the system through the ammonia refueling station. The remaining ammonia gas can be discharged to the external sewer or pool through the relevant pipeline. In the process of processing, pay attention to the pressure of low-pressure equipment not to be too high and accidents of ammonia escape occur, and the goods in the warehouse are contaminated due to defrosting. The specific treatment method can be illustrated by examples: If a pipe leaks in a high-pressure liquid storage barrel: first stop the machine, then close the relevant communication valves of the high-pressure liquid storage barrel, condenser and oil separator, and increase the outlet valve. Drain the liquid from the drain tank or drain the liquid into the circulation tank. If there is too much ammonia in the system, the ammonia can be discharged to the ammonia tank outside the system through the ammonia refueling station. When the liquid level of the high-pressure liquid tank is no longer visible, stop draining. The remaining ammonia can be discharged into the outdoor pool through the drain pipe and the drain pipe of the oil collector. When the pressure drops to OMPa, the leak can be welded or repaired.
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