Armstrong 4280 Series Installations- und Betriebsanleitung - Seite 8
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i nstal la ti on &
o p era t i n g i n stru ction s
8
symptoms
Pump fails To deliver
Pump vibrates
Seal leaks or fails
Low delivery rate
Insufficient pressure
Low bearing life
Series 4280
motor mounted pump
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.
• Dirt in bearings.
• Bearings too tight.
• Bearings badly installed.
• Misalignment of pipework.
• Rotating element out of balance.
• Shaft bent.