What Should I Do If The Submersible Pump And Deep Well Pump Cannot Pump Water? Precautions During Acceptance Inspection

Oct 12, 2024

What should I do if the deep well submersible pump is not filled with water or the water volume is small?
When the deep well submersible pump is not filled with water or the water volume is small, first check the difference between the current of the pump running at this time and the current during normal operation, which is different from the fire pump manufacturer.
If it is smaller than usual during operation, there may be issues such as impeller wear and blockage of the check valve on the pump head.
If the current is as high as usual, it may be due to issues such as pipe gasket leakage, pipe leakage, or pump body leakage.
If the current is higher than usual during operation, it can be basically determined that it is a problem of wear and tear of vulnerable parts.
Additionally, if the cable is damaged, the amount of water will be the same as usual, but the current will increase. The current of a three-phase 380V motor is generally 2.2A.
The above reasons can be identified by maintenance personnel who frequently repair deep well pumps.
(1) The specifications, models, and quantities of working fire pumps, backup fire pumps, suction pipes, outlet pipes, pressure relief valves on outlet pipes, water hammer elimination facilities, check valves, signal valves, etc. should meet the design requirements; The control valves on the suction and discharge pipes should be locked in the normally open position and clearly marked.
Number of inspections: All inspections.
Inspection method: Observe and inspect according to the drawings.
(2) The fire water pump should adopt self filling water intake or other reliable water intake measures.
Number of inspections: All inspections.
Inspection method: Observe and measure with a ruler.
(3) Open each end water testing device and valve in the system separately, and ensure that the functions of signal devices such as water flow indicators and pressure switches meet the design requirements.
(4) Open the water test valve on the outlet pipe of the fire pump. When starting the fire pump with the main power supply, the fire pump should start normally; Turn off the main power supply, and the main and backup power supplies should be able to switch normally.
Number of inspections: All inspections.
Inspection method: Observe and inspect.
(5) When the fire pump stops, the pressure after the water hammer elimination facility should not exceed 1.3-1.5 times the rated pressure at the pump outlet.
Number of inspections: All inspections.
Inspection method: Check with a pressure gauge at the valve outlet.
(6) For fire pressure water supply equipment, when the system pressure drops to the design low pressure, the stabilizing pump should be started through the pressure change signal.
Number of inspections: All inspections.
Inspection method: Use a pressure gauge and observe for inspection.
(7) The start control of the fire pump should be set to automatic start mode.
Number of inspections: All inspections.
Inspection method: Observe and inspect.