TROUBLE SHOOTING CHART
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
Little or no discharge
and unit will not prime
1.Casing not filled with water
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
enough in water; pulling air.
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.
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.
Loss of suction after
satisfactory operation.
1.Air leak in suction line.
2.When unit was last turned off, water siphoned
out of pump casing.
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).
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.
Pump overloads driver
1.Total head lower than pump rating, unit
delivering too much water.
2.Specific gravity and viscosity of liquid being
pumped different than the pump rating.
3.Speed to high.
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.
Pump vibrates and/or
makes excessive noise
1.Mounting plate or foundation not rigid enough.
2.Foreign material in pump causing unbalance.
3.Impeller bent.
4.Cavitation present.
5.Piping not supported to relieve any strain on
pump assembly.
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.
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
1.Replace
2.Replace
3.Open
4.Clean or replace
5.Clean or replace
6.Lower the height
7.Clean or replace.
8.Replace
Pumps leaks at shaft
1.Worn mechanical seal.
2.Replacement seal not installed properly.
1.Replace
2.Follow Maintenance instructions carefully.
9
Содержание burks pumps WB12
Страница 8: ...FIGURE 3 8 ...
Страница 11: ... Crane Pumps Systems Inc 1994 2001 NOTES 11 ...
