SPP id: Version 14 > / 120601 / Replaces 110901 / en /
N31572
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Series
2.15
INSTRUCTIONS
June 2012
Page
ISO
G
COPYRIGHT © SULZER PUMPS FINLAND OY
ORIGINAL INSTRUCTION
USER'S MANUAL – AHLSTAR
Operation
Probable cause:
Remedy:
Suction piping, suction valve or impeller partially clogged
Check the suction piping and the pump for any obstructions
Rotational speed too low
Check the speed requirements/limitations
Flow resistance of the piping higher than the head generated
by the pump
Check resistancies and reduce losses
Pressure containing pump parts worn/damaged/clogged
Check the pump and replace defective parts, if necessary
Table 6, Symptom: High power consumption
Probable cause:
Remedy:
Rotational speed too high
Check the speed requirements/limitations
Wrong direction of rotation
Change the direction of rotation acc.to the arrow sign on the
bearing unit
Flow resistance of the piping much higher/lower than the head
generated by the pump
Check the piping arrangements
Unexpected specific gravity of the pumped liquid
Consult manufacturer for further instructions
Unexpected viscosity of the pumped liquid
Consult manufacturer for further instructions
Pump and motor incorrectly aligned
Realign the pump and motor assembly, make sure there is no
strain on the pump.
Crooked or eccentric shaft
Reassemble the pump and renew the shaft and bearings, if
necessary
Rotating objects or pump parts chafing inside the pump
Reassemble the pump and check the clearances
Pressure containing pump parts worn/damaged/clogged
Check the pump and replace defective parts, if necessary
Mechanical tightness of pump components
Reassemble the pump and check the clearances
Table 7, Symptom: Excessive noise and/or vibration
Probable cause:
Remedy:
Difference between inlet pressure and vapor pressure too
small (cavitation)
Check the suction piping arrangements
Unexpected air/gas content in the pumped liquid
Consult manufacturer for further instructions
Air leakage in suction opening, suction piping or shaft seal
Check the suction piping/readjust the shaft seal
Suction piping, suction valve or impeller clogged
Check the suction piping and the pump for any obstructions
Rotational speed too low
Check the speed requirements/limitations
Flow resistance of the piping higher than the head generated
by the pump
Check resistancies and reduce losses
Pump functioning below the recommended minimum flow
(cavitation)
Check the pumping system requirements
Pump foundation not rigid enough
Strengthen the foundation
Inadequate piping support exerting strain on the pump
Check the piping support requirements
Pump and motor incorrectly aligned
Realign the assembly, make sure there is no strain on the
pump.
Crooked or eccentric shaft
Reassemble the pump and renew the shaft and bearings, if
necessary
Rotating objects or pump parts chafing inside the pump
Reassemble the pump and check the clearances
Pressure containing pump parts worn/damaged/clogged
Check the pump and replace defective parts, if necessary
Mechanical tightness of pump components
Reassemble the pump and check the clearances
Bearings worn or loose
Reassemble the pump and replace the bearings, if necessary
Inadequate or excessive lubrication
Check the pump for proper lubrication
Impeller damaged or out of balance
Reassemble the pump and replace the impeller, if necessary
Table 8, Symptom: Bearings wear rapidly
Probable cause:
Remedy:
Pump and motor incorrectly aligned
Realign the pump assembly, make sure there is no strain on
the pump. Replace the bearings, if necessary.
Crooked or eccentric shaft
Reassemble the pump and straighten or replace the shaft