Change the opening degree of sluice valve at pump outlet to adjust the pressure and flow quantity at pump outlet, make sure the pumping unit runs in high efficiency range, i.e., the range between large flow quantity point and small flow quantity point. Note: the actual head of the pump equals to the pressure at outlet minus the pressure at inlet. The pumping unit is proved to have no hydraulic performance problems, as long as the pressure and flow quantity of the submersible pump deep well conform to the designed working conditions, and the motor doesn’t work with overload. As for whether it meets the requirements on site, that depends on model selection.
Points of observation and check during test run
1) Check if pump head, pump flow quantity (through flow meter) and motor electric current conform to the requirements of design.
2) Check if the noise and vibration of the pumping unit conform to standard regulations.
3) Check the temperature and temperature rise of the shaft bearing.
4) Check if the shaft seal leaks.
Notes for the submersible pump deep well when it formally starts running
1) Note if the reading of ampere meter surpasses the rated electric current of the motor. Stop the pump timely for inspection if the reading is too high or too low.
2) Check if the packing chamber becomes hot, if it leaks water normally. Normally, it should leak water drop by drop continuously. You can control leakage by adjusting the nuts on packing gland. When the packing is worn out and too much water is leaking, you should supplement the packing or replace it timely. If there is too little or no water leakage, you should check if something blocks the back flow hole (built-in type) in pump gland or the external water supply pipeline.
3) Check the leakage amount of the mechanical seal. It is normal if the leakage amount is lower than 5ml/h. If you have no measuring cup, you can eyeball the amount of water drops. 8 to 10 drops per min is normal.
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