Analysis of reasons for insufficient liquid or pressure of fire pump
Fire pumps are divided into different types according to different classification methods. They are fully sealed, leak-free, and corrosion-resistant. It is widely used in environmental protection, water treatment, fire fighting and other departments to pump all kinds of liquids. It is an ideal pump to create a non-leakage, non-polluting civilized workshop and a civilized factory. The pumps are similar to the pumps of the fire-fighting system, but the lift and flow different. But often in the process of use, there will be insufficient liquid or insufficient pressure.
1. The pump is not filled with water or is not properly vented. Elimination measures: Check whether the pump casing and inlet pipeline are all filled with liquid.
2. The speed is too low. Elimination measures: Check whether the wiring of the motor is correct, whether the voltage is normal or whether the steam pressure of the turbine is normal.
3. The system head is too high. Elimination measures: check the system head (especially friction loss).
4. The suction lift is too high. Elimination measures: check the existing net pressure head (too small or too long inlet pipeline will cause great friction loss).
5. Impeller or pipeline is blocked. Elimination measures: check for obstacles.
6. The direction of rotation is wrong. Elimination measures: Check the direction of rotation.
7. Air is generated or there is a leakage in the inlet pipeline. Elimination measures: Check the inlet pipeline for air pockets and/or air leakage.
8. The packing or seal in the stuffing box is worn, causing air to leak into the pump casing. Elimination measures: check the packing or seal and replace as necessary, and check whether the lubrication is normal.
9. The suction head is insufficient when pumping hot or volatile liquids. Elimination measures: increase the suction head and consult the manufacturer.
10. The bottom valve is too small. Elimination measures: Install a bottom valve of the correct size.
11. The immersion depth of the bottom valve or inlet pipe is insufficient. Elimination measures: Consult the manufacturer for the correct immersion depth. Use baffles to eliminate turbulence.
12. Impeller clearance is too large. Elimination measures: Check whether the clearance is correct.
13. Impeller damage Elimination measures: check the impeller and replace it as required.
14. The impeller diameter is too small. Elimination measures: consult the manufacturer for the correct impeller diameter.
15. The position of the pressure gauge is incorrect. Elimination measures: Check whether the position is correct and check the outlet nozzle.
