Barnes 30MU Installatie- en bedieningshandleiding - Pagina 8

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SYMPTOM

Little or no discharge

1. Casing not filled with water

and unit will not prime

2. Total head too high

3. Suction head higher than pump designed for.

4. Impeller partially or completely plugged

5. Hole or leak in suction line

6. Foot-valve too small.

7. Impeller damaged.

8. Foot-valve or suction line not submerged deep

9. Insufficient inlet pressure or suction head.

10. Suction piping too small.

11. Casing gasket leaking.

12. Suction or discharge line valves closed.

13. Piping is fouled or damaged.

14. Clogged strainer or foot-valve.

15. Incorrect engine speed.

Loss of suction after

1. Air leak in suction line.

satisfactory operation.

2. When unit was last turned off, water siphoned

3. Suction head higher than pump designed for.

4. Insufficient inlet pressure or suction head.

5. Clogged foot-valve, strainer, or pump.

6. Defective wearplate(s).

Pump overloads driver

1. Total head lower than pump rating, unit

2. Specific gravity and viscosity of liquid being

3. Speed to high.

Pump vibrates and/or

1. Mounting plate or foundation not rigid enough.

makes excessive noise

2. Foreign material in pump causing unbalance.

3. Impeller bent.

4. Cavitation present.

5. Piping not supported to relieve any strain on

Pumps runs but no fluid.

1. Faulty suction piping (air leak).

2. Pump located too far from fluid source.

3. Gate valve closed.

4. Clogged strainer.

5. Fouled foot-valve.

6. Discharge height too great.

7. Fouled impeller.

8. Faulty mechanical seal

Pumps leaks at shaft

1. Worn mechanical seal.

2. Replacement seal not installed properly.

HOME

TROUBLE SHOOTING CHART

POSSIBLE CAUSE(S)

enough in water; pulling air.

out of pump casing.

delivering too much water.

pumped different than the pump rating.

pump assembly.

Manual Index

1.Fill pump casing. Using a foot-valve will extend

pump life and facilitate immediate priming.

2. Shorten suction head.

3. Lower suction head, install foot-valve and prime.

4. Disassemble pump and clean out impeller.

5. Repair or replace suction line.

6. Match foot-valve to piping or install one size

larger foot-valve

7. Disassemble pump and replace impeller.

8. Submerge lower in water.

9. Increase inlet pressure by adding more water to

tank or increasing back pressure by turning

gate valve on discharge line partially closed

position.

10. Increase pipe size to pump inlet size or larger.

11. Replace.

12. Open.

13. Clean or replace.

14. Clean or replace.

15. Increase speed.

1. Repair or replace suction line.

2. Refill (reprime) pump casing before restarting.

3. Lower suction head, install foot-valve and

primer.

4. Increase inlet pressure by adding more water to

tank or increasing back pressure by turning

gate valve on discharge line to partially closed

position.

5. Unclog, clear or replace as necessary.

6. Replace.

1. Increase back pressure on pump by turning

gate valve on discharge line to partially closed

position that will not overload engine.

2. Consult factory.

3. Check and correct, lower speed.

1. Reinforce.

2. Disassemble pump and remove.

3. Replace impeller.

4. Check suction line for proper size and check

valve in suction line if completely open,

remove any sharp bends before pump and

shorten suction line.

5. Make necessary adjustments.

1. Replace

2. Replace

3. Open

4. Clean or replace

5. Clean or replace

6. Lower the height

7. Clean or replace.

8. Replace

1. Replace

2. Follow Maintenance instructions carefully.

CORRECTIVE ACTION