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:
Rotating objects or pump parts chafing inside the pump
Reassemble the pump and check the clearances
Impeller damaged or out of balance
Reassemble the pump and replace the impeller, if necessary
Inadequate or excessive lubrication
Check the pump for proper lubrication
Badly installed and/or dirty bearings
Renew bearings, if necessary. Check the quality and amount
of lubricant
Table 9, Symptom: Pump overheats/seizes
Probable cause:
Remedy:
Pump not adequately primed
Reprime the pump and suction piping
Flushing liquid is not on (liquid ring pumps (-LM, -S))
Open the flushing liquid valve.
Difference between inlet pressure and vapor pressure too
small
Check the suction piping arrangements. The pump may
operate below the recommended minimum flow (cavitation)
Pump functioning below the recommended minimum flow
(cavitation)
Check the pumping system requirements
Pump and motor incorrectly aligned
Realign the assembly, make sure there is no strain on the
pump
Bearings worn
Reassemble the pump and replace the bearings, if necessary
Crooked or eccentric shaft
Reassemble the pump, straighten or renew the shaft
Impeller damaged or out of balance
Reassemble the pump and replace the impeller, if necessary
Rotating objects or pump parts chafing inside the pump
Reassemble the pump and check the clearances
Discharge valve closed
Open the discharge valve
Discharge valve clogged
Check the pipe and flush it if necessary
Table 10, The liquid pumped flows out through the degassing connection (pumps equipped with gas
separators (-GM, -GS) and air separating pumps (-R))
Probable cause:
Remedy:
Inlet height too high
Check the suction height limits
Pump speed too small
Check the speed requirements and restrictions
Degassing vacuum too high
Adjust the degassing vacuum by means of the vacuum relief
valve