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Submersible pump: This pump can operate in automatic mode, starting automatically when the liquid level reaches 80% and stopping automatically at 20%. It can also be operated in manual mode, but it is not currently in use. Pre-startup checks (1) Check whether the inlet and outlet pipelines to the wet solvent tank (or solvent tank) are unobstructed. (2) Set the manual/automatic selection switch to the manual position “M”. (3) Spin the pump a few times to check for any abnormalities, whether it rotates smoothly, and if there are any unusual noises. (4) Manually, check whether there is sufficient liquid in the underground solvent. (5) Check whether the piping, instruments, and electrical systems meet the requirements. Starting a submersible pump: (1) When starting manually, close the outlet valve completely. Turn on the power switch 1–2 times to confirm once again that the pump is rotating in the correct direction, and check for any abnormalities in its operation. The pump should not be run without flow for more than one minute. (2) Restart the submersible pump and slowly open the outlet valve until the specified outlet flow rate and pressure are reached. (3) In automatic mode, keep the pump outlet valve fully open, connect the power supply, and wait until the pressure rises to the normal value. After startup, check: (1) Whether there are any abnormalities with the motor and pump, whether the liquid flow in the pump’s outlet line is smooth, and whether the temperature of the mechanical seal is normal. (2) Check the current, outlet pressure, flow rate, and vibration of the pump and motor. Precautions: When operating manually, someone must monitor the liquid level and be attentive to shutting down the pump. During normal operation, set the selector switch to the automatic mode (this has not been used yet). With the liquid flow stopped, pump (1) is used to slowly close the pump outlet valve. (2) Cut off the power and stop the pump. (3) In the event of an emergency shutdown of the pump, the power supply can be cut off first to stop the pump, and then the pump outlet valve should be closed. Pump filtration cleaning (1) Check for clogging of the filter; generally, the filter may be clogged when phenomena such as a drop in the pump’s outlet pressure, instability, and a decrease in flow rate occur. (2) Switch to the backup pump; if there is no backup pump, stop operating that pump. Switching to the backup pump also requires coordination with the control room. (3) Close the pump’s inlet and outlet valves, as well as the heat tracing steam valve, etc.; open the pump head drain valve and the filter drain valve to drain the material from within the pump. (4) Remove the filter, clean the filter mesh, and then reinstall it. Be careful with the orientation of the filter mesh to ensure it is installed correctly. (5) Ensure proper fluid filling and exhaust; the high-temperature pump must be warmed up to put it in a standby state.