Armstrong 4280 Series Manual de instrucciones de instalación y funcionamiento - Página 9
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symptoms
Bearings overheat
Pump delivery fails after start
Pump seized
Pump does not prime
Pump noisy
Motor overloading
Motor overheating
Series 4280
motor mounted pump
reasons
• 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.
• Misalignment
• Air or vapour in suction line.
• Inlet or suction pipe insufficiently submerged.
• N.P.S.H. available too low.
• Air leaks in suction line, gland or pump joints.
• Blocked suction.
• Impeller damaged.
• Operation at low capacity.
• Rotating element out of balance.
• Shaft bent.
• Poor foundations.
• Operation at high capacity.
• Misalignment
• Speed too high.
• Low system friction.
• S.G. too high.
• Misalignment
• Speed too high.
• Low system friction.
• Pump liquid density is greater than anticipated.
in sta l l a t io n &
o pera t ing instr uct io n s
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