Describe the shutdown procedures for the circulating water plant?

1 Stop operating the sand filter 1) Close the air supply valve of the sand filter； 2) Close the inlet valve of the sand filter ； 3) Open the sand filter vent valve ； 4) Confirm that the sand filter is drained. 2 Shut down the chemical dosing system 1) Verify that the chemical level is at the low limit ； 2) Stop the chemical pump ； 3) Clean the medicine storage tank thoroughly. 3 Shut down the monitoring heat exchanger 1) Turn off the electric heating device ； 2) Close the inlet and outlet valves of the monitoring heat exchanger, as well as the inlet and outlet valves of the condenser. 4 Stop water supply 1) Confirm the shutdown order from the dispatch team ； 2) Close the acid water stripping and purification water makeup valve ； 3) Close the production feedwater make-up valve. 5 Stop operating the circulating chilled water pumps: 1) Reduce the number of chilled water pumps in operation one by one, based on the system pressure and the water consumption of each unit ； 2) Slowly close the manual outlet valve ； 3) Press the motor stop button ； 4) Confirm the scheduling shutdown order ； 5) Shut down all chilled water pumps. 6 Shut down the cooling tower 1) Confirm that the cooling tower fan can be stopped ； 2) Stop the cooling tower fans ； 3) Confirm that the cooling tower can be shut down ； 4) Close the tower water valve ； 5) Open the drain valve of the cooling tower sump ； 6) Control the amount of wastewater discharged to prevent overload of the sewage treatment plant ； 7) Confirm that the riser pipeline is drained ； 8) Confirm that the cooling tower sump and chilled water tank are emptied. 7 Close the valves of the relevant system pipelines 1) Open the vent valves at each vent point of the system pipelines ； 2) Confirm that the water in the system’s piping network has been drained ； 3) Close the vent valve ； 4) Close the main cold water valve of the circulating water outlet device ； 5) Close the main valve for circulating return water.

1. Close the system water supply valve to stop water supply； 2. Stop the side filtration system ； 3. Stop adding chlorine, chemicals, and acid ； 4. Shut down the fan ； 5. Stop the circulation pump ； 6. Shut down the cooling tower ； 7. System drainage.