Barrel is designed for low pressure circulation pump for liquid ammonia system established, should be set in place near the ammonia pump, usually located in between the devices and were set according to different evaporation temperature of the system. To facilitate observation, operation, maintenance, generally located above the elevation of 2.4m operating platform, setting ammonia pump below the platform. Setting the height of the low pressure circulation bucket barrel should be normal to the ammonia level to maintain a certain distance from the centerline of the pump, in order to ensure the normal operation of the ammonia pump prevent cavitation. When using centrifugal pumps center distance and the low level circulation between the barrel of not less than the normal pump NPSH (net positive suction head) + 0.5m; using a gear pump, when the ammonia pump inlet side pressure is less than 1000kPa when low pressure circulation barrel to pump fluid outlet center distance should be greater than or equal to 600mm. Low compression cycle barrel level controller should be set to automatic warning devices and ultra-high level, the normal level control in the barrels full length from the bottom of the barrel 1/3; alarm level control in the barrels full length of the barrel from the top 1 / 3. Low cycle barrel must set safety valve, pressure gauge and level indicator. To prevent ammonia pump cavitation, in low pressure circulation bucket to ammonia pump piping configuration, the liquid refrigerant to minimize eddy current phenomenon into the pump, a reasonable set of catheters, to minimize pressure loss. Usually side fluid barrel, a barrel two pumps, an outlet pipe connected to an ammonia pump alone. Outlet pipe and the tank wall angle 20. About. Two ammonia pump spacing 0.5mm, in order to facilitate maintenance operations, ammonia pump inlet and outlet pipe, filters should pack insulation to prevent cold damage and ammonia pump cavitation caused. To protect the ammonia pump, should set ammonia pump-controlled loop, set pressure controllers, check valves, bypass valves, valve and pumping lines corresponding to prevent and preclude cavitation. Ammonia pump should be located around the sewer drain to rule after stopping the defrost water pump. The company said that if such product quality problems, we will be 24 hours to reach a timely manner, to ensure normal operation of equipment.