Armstrong 4039 Series Installations- und Betriebsanleitung - Seite 7

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Symptoms
Pump fails to deliver
Pump vibrates
Seal leaks or fails
Low delivery rate
Insufficient pressure
Low bearing life
Bearings overheat
Pump delivery fails after start
Pump seized
Pump does not prime
Reasons
 Pump not primed.
 Suction line not filled.
 Air or vapour pocket in suction line.
 Inlet of Suction pipe insufficiently submerged.
 N.P.S.H. available too low.
 Suction lift too high.
 Air leaks in suction line, gland or pump joints.
 Blocked suction.
 Incorrect rotation.
 Speed too low.
 Total head of system higher than that of pump.
 Misalignment
 Air or vapour pocket in suction line.
 Inlet of suction pipe insufficiently submerged.
 N.P.S.H. available too low. Suction lift too high.
 Blocked suction.
 Impeller damaged.
 Packing too tight.
 Misalignment of pipework.
 Operation at low capacity.
 Rotating element out of balance.
 Shaft bent.
 Poor foundations.
 Misalignment
 Impurities in water.
 Entrained air.
 Cavitation.
 Bearing failure.
 Water treatment not allowed for.
 Air or vapour pocket in suction line.
 Inlet of suction pipe insufficiently submerged.
 N.P.S.H. available too low.
 Suction lift too high.
 Air leaks in suction line, gland or pump joints.
 Blocked suction.
 Incorrect rotation.
 Speed too low.
 Excessive system friction.
 Impeller damaged
 Incorrect rotation.
 Speed too low.
 Excessive system friction.
 Impeller damaged.
 Misalignment
 Dirt in bearings.
 Bearings too tight.
 Bearings badly installed.
 Misalignment of pipework.
 Rotating element out of balance.
 Shaft bent.
 Misalignment
 Insufficient cooling to stuffing box.
 Misalignment of pipework.
 Dirt in bearings.
 Bearings too tight.
 Bearings badly installed.
 Suction line not filled.
 Air or vapour pocket in suction line.
 Inlet of suction pipe insufficiently submerged.
 N.P.S.H. available too low.
 Suction lift too high.
 Air leaks in suction line, gland or pump joints.
 Blocked suction.
 Impeller damaged.
 Pump not primed.
 Misalignment of pipework.
 Operation at low capacity
 Pump not primed.
 Inlet of suction pipe insufficiently submerged.
 Suction lift too high.
 Blocked suction.
 Incorrect rotation.
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