Common faults and solutions of fire pumps in fire trucks

Name

Model

Work Condition

Flow rate

(L/S)

Outlet pressure

(Mpa)

Rated speed

(r/min)

Power

(KW)

Suction depth

(m)

Low pressure fire pump

CB10/20-XZ

1

20

1

3070±50

34.29

3

2

14

1.3

3380±50

35.36

3

3

10

1

3115±50

27.42

7

Low pressure fire pump

CB10/30-XZ

1

30

1

3010±50

50

3

2

21

1.3

3340±50

55.2

3

3

15

1

3000±50

38.6

7

Low pressure fire pump

CB10/40-XZ

1

40

1

3080±50

62.92

3

2

28

1.3

3360±50

63.92

3

3

20

1

2990±50

41.95

7

Low pressure fire pump

CB10/60-XZ（1:1.346）

1

60

1

3200±50

97.72

3

2

42

1.3

3475±50

105.76

3

3

30

1

3130±50

72.75

7

Low pressure fire pump

CB10/80-XZ (1:1.44)

1

80

1

3400±50

137.6

3

2

56

1.3

3500±50

127.11

3

3

40

1

3130±50

83.75

7

Low pressure fire pump

CB10/100-XZ

1

100

1

2270±50

149

3

2

70

1.3

2320±50

138

3

3

50

1

2050±50

115

7

Pump does not deliver water, pressure gauge pointer jumps violently

1. Water level is below the rear cover plate of the first-stage impeller

2. Pipeline or instrument leaks

1. Raise the water level or increase the pump's submersion depth to ensure normal water intake

2. Check and tighten or block the leak to eliminate its impact on pump operation

Pump does not deliver water, pressure gauge shows pressure

1. Outlet pipeline pressure is too high

2. Rotation direction is incorrect

3. Rotational speed is insufficient

1. Check and appropriately shorten the outlet pipeline to reduce outlet pressure

2. Adjust the motor rotation direction to ensure consistency with the pump's design requirements

3. Check the power supply voltage to ensure the pump's rotational speed meets the design requirements, or increase the power supply voltage

Insufficient flow or low head

1. Impeller or inlet pipeline is blocked

2. Seal ring is excessively worn or impeller is damaged

3. Rotational speed is below the specified value

1. Clean the impeller and pipeline to eliminate blockages

2. Replace the severely worn seal ring or damaged impeller in a timely manner

3. Adjust the pump's rotational speed to ensure it reaches the rated value

Pump consumes excessive power

1. Packing is too tight

2. Guide bearing lubrication is insufficient

3. Seal ring friction

4. Flow rate is too high

5. Medium contains too many impurities

1. Appropriately loosen the packing gland to reduce the pump's load

2. Increase the lubricating water pressure and flow rate to ensure sufficient lubrication of the guide bearing

3. Check and eliminate the causes of mechanical friction, such as replacing the worn seal ring

4. Check the gate valve opening to control the flow rate within the pump's design range

5. Control the impurity content in the medium or increase the matching power to cope with high energy consumption

Abnormal noise in the pump, pump does not deliver water

1. Guide bearing is severely worn

2. The temperature of the pumped liquid is too high

3. Pump flow rate is too high

1. Check and replace the worn guide bearing to restore normal pump operation

2. Lower the temperature of the pumped liquid to ensure the pump operates within a suitable temperature range

3. Reduce the pump's flow rate setting to a reasonable range

Abnormal vibration of the pump

1. Guide bearing is damaged

2. Pump shaft and motor are not concentric

3. Anchor bolts are loose

4. Pump shaft is deformed or the coupling is loose or damaged

1. Check and replace the damaged guide bearing

2. Align the pump shaft and motor to ensure they are concentric

3. Tighten or re-pour the anchor bolts to ensure the pump's stability

4. Replace the deformed or damaged pump shaft or coupling

Rolling bearing overheats

1. Rolling bearing lubrication is insufficient

2. Pump shaft and motor are not concentric

3. Flow rate and head are too high, causing the pump to operate overloaded

1. Check the oil cup to ensure the rolling bearing receives sufficient lubricant

2. Align the pump shaft and motor to reduce the load on the rolling bearing

3. Adjust the flow rate and head to ensure operation within the pump's load-bearing range

Pump cannot start

1. Power supply issues (such as loose connections, poorly contacting switches, phase loss, etc.)

2. Mechanical faults in the water pump (such as packing being too tight, impeller and pump body being jammed by debris, severe bending of the pump shaft, etc.)

1. Check the power lines for good contact, and ensure the switches are working properly. Repair any circuit breaks, poor contacts, blown fuses, or phase loss issues promptly.

2. Check the mechanical components of the water pump, such as the packing, impeller, and pump shaft, and repair or replace any damaged or clogged parts promptly.

Pump cannot draw water

1. Air in the pump body or air accumulated in the inlet pipeline

2. Foot valve is not tightly closed or damaged

3. Vacuum pump packing leaks severely

4. Gate valve or check valve is not tightly closed

5. Pipeline leaks or is airtight

1. Prime the pump with water first, then fill the pump body with water before starting

2. Check if the foot valve is tightly closed or replace the damaged foot valve

3. Check the vacuum pump packing for leaks and replace it if necessary

4. Ensure the gate valve or check valve is tightly closed

5. Check the pipeline for leaks or airtightness and repair any issues promptly

Pump body leaks

1. Seals are aged or worn 2. Pump body connections are loose

1. Check and replace aged or worn seals 2. Tighten the bolts at the pump body connections to ensure good sealing

Motor overheats

1. Voltage is too high or too low

2. Transmission is not smooth (such as bearing lack of oil, damage, etc.)

3. Ventilation system malfunctions (such as fan damage, ventilation duct blockage, etc.)

1. Check the power supply system to ensure the voltage is stable within the specified range

2. Check the transmission system to ensure the bearings are adequately lubricated and replace any damaged parts promptly

3. Check the ventilation system to ensure the fan is operating normally and the ventilation ducts are unobstructed

Inlet/outlet valve malfunctions

1. Valve is damaged

2. Valve is clogged

1. Replace the damaged valve

2. Clean the valve to remove any debris or foreign objects and ensure it is unobstructed

Suction pipeline is clogged

Debris, sediment, or foreign objects are present in the pipeline

Clean the suction pipeline to remove any debris, sediment, or foreign objects

Pressure stabilizing pump starts frequently

1. Pipeline leaks

2. Safety relief valve seal is poor

3. Test valve is not tightly closed

4. Check valve seal pad is contaminated with impurities

5. Pressure switch start-up pressure setting is too high

6. System pipeline leaks severely

7. Pressure tank capacity is too small

1. Repair any leaks in the pipeline

2. Inspect and repair the safety relief valve to ensure good sealing

3. Fully close the test valve

4. Clean the check valve and the water tank and pipeline

5. Adjust the pressure switch start-up pressure setting to a reasonable range

6. Inspect the system pipeline and repair any leaks

7. Increase the pressure tank capacity or replace it with a suit