salmson S series - 10 Faults, Causes and Remedies

ENGLISH 
21
10 FAULTS,CAUSESANDREMEDIES

Fault Cause Remedy
Pump does not
prime
‐Pumphadtobestoppedbeforeitwasprimed Checktheoreticalprimingtime
Checkthatgreasecartridgewasactivated
Checkthattemperaturesensortripissetproperly(ATEXversions)
‐Noliquidinprimingchamberorliquidlevelistoolow Fillpumpcasingwithfluid
Checklevelswitchesposition
‐Airintakeinsuctionline Checkshapeofconnectionsandthreads
Checktighteningofhosesfasteningcollars
Proceedwithreplacementofdamagedhoses
Dosealingoperationsagainifnecessary
‐Impellerorcasingwearplateisworn Replacewearplateorimpeller
Checkpumpworkingconditions
‐Liquidtemperatureinpumpistohigh Fillthepumpwithcoldliquid
‐Pressurizeddischargepipe Add a vent valve between the check valve and the discharge flange or
addadedicateddischargepipebacktothepit
‐Motorspeedistoolow Checktighteningofpowersupplycableconnections
Checkmotorcurrentconsumption
Increasefrequencyupto50Hz(ifafrequencyinverterhasbeensupplied)
‐Airintakethroughtheshaftsealing.Leakingmechanicalseal. Replacegreasecartridge
Replacemechanicalseal
In case of emergency : grease copiously mechanical seal faces and back
ofthestationaryseatwithhighviscositygrease
‐Wrongmotordirectionofrotation Changetwophasesinmotorjunctionbox
The pump is not
producing the rated
floworhead
‐Dischargepressureistoohigh Openandcleandischargepipe
Checkpumpdutypoint
‐Pumporpipingisnotcompletelyvented Ventpumpcasingandsuctionline
‐Suctionliftistoohigh/NPSHavailableistoolow Checkfluidlevelinthetankandcheckmaxflowaccordingtopumpcurve
Checkisolatingvalveisopenedonthepumpsuctionside
Cleanthestrainerifany
‐ Clearance between the impeller and the wear plate(s) is
excessive
Checkwearplate(s)thickness
Replacewornwearplate(s)bynewone(s)
‐Wrongdirectionofrotation Changetwophasesinmotorjunctionbox
‐ Leakage on pump casinggaskets, on shaft sealing or on suction
piping
Replacecasingseal(s)
Checkshaftsealing
Checkthestateoftheflangesseals
Pump is not lifting
liquid
‐ Air leaks into pump through mechanical seal, sleeve, clogged
strainerorleakageinsuctionline
Replacecasingseal(s)
Checkshaftsealing
Checkthestateoftheflangesseals
‐Suctionliftistoohighorheadlossesinsuctionlineareexcessive Checkfluidlevel
CheckthattheavailableNPSH of theprocessishigher thantherequired
NPSHofthepump
‐ Too much foreignmatter in pump casing or part blocked inside
theimpeller
Openvisitportandcleantheinsideofthepump
Thepumpleaks
‐Casingseal(s)leaking Tightenboltsandscrewsaccordingtheprovidedtighteningtorquevalues
Checkthestateofthegaskets
‐Mechanicalsealisleaking CheckthestateofthemechanicalsealfacesandO’Ring
Proceedwithreplacementofthemechanicalseal
Replacegreasecartridgebyanewone
The pump runs
noisily
‐Ballbearinginbearingbracketorinmotoriswornordestroyed Replaceballbearings
‐Incorrectinflowofcirculationliquid Cavitations:checkpumpdutypoint
‐Suctionheadistoohighordischargeheadtolow Checkfluidlevelinthetankandopenallvalvessetonsuctionpipe
Checkpumpdischargepressure
Cleanthestrainer
‐ Wrong assembly of the base plate on its foundations or
unauthorizedforcesappliedtopumpflanges
Checkpumpinstallation
Checkliningofcoupling
‐Foreignmatterremainsinsidethepumpcasing Openvisitportandcleanthepump
Motor protection
switchesoff
‐Currentleakage Checkearthingofthemotor
Check for current leakage : damaged cables, fluid leakage on electrical
components…
‐Protectionfusesnotcalibratedproperly Checkmotorabsorbedpowerandselectmotorprotectionsaccordingly.
‐Liquiddensityhigherthanexpected Calculateabsorbedpowerandreplacemotoraccordingly
‐Pumprunsrightofcurveoroutofapplicationlimits Measurepumpdutypointandcheckpumprunsinauthorizedapplication
limits.Ifnecessaryadd aregulatingvalveoracalibrated orificeonpump
dischargeline
‐Foreignmatterremainsinsidethepumpcasing Openvisitportandcleanthepump
