Pump survey & line bearing
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Transcript of Pump survey & line bearing
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Centrifugal PumpCentrifugal Pump
Impeller/Wear Rings/CasingImpeller/Wear Rings/Casing Wear & tearWear & tear ClearancesClearances
ShaftShaft Wear & tearWear & tear AlignmentAlignment ““ringing” soundringing” sound
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Gear PumpGear Pump Gears/CasingGears/Casing
Wear & tearWear & tear ClearancesClearances
BacklashBacklash Gear/casingGear/casing Gear shaft/bushGear shaft/bush Bush/casingBush/casing
Safety ValveSafety Valve ConditionCondition
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Screw PumpScrew Pump
Screws/casing/timing gearsScrews/casing/timing gears Wear & tearWear & tear ClearancesClearances
ScrewsScrews Timing gearsTiming gears
““ringing” soundringing” sound Safety ValveSafety Valve
conditioncondition
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Mono PumpMono Pump
Stator/rotorStator/rotor conditioncondition
Safety valveSafety valve conditioncondition
ShaftShaft conditioncondition
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Pump & Line BearingPump & Line Bearing
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Two Stage Single Impeller
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Line BearingsLine Bearings
TeflonTeflon ElastomerElastomer PolyesterPolyester CarbonCarbon SimsiteSimsite
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Provided in the volute cover/fitted onto the Provided in the volute cover/fitted onto the shaftshaft
Held by cover or set screwsHeld by cover or set screws Keep shaft steady by taking up the radial Keep shaft steady by taking up the radial
deflectiondeflection Will fail first, prevent further damages esp. to Will fail first, prevent further damages esp. to
the shaftthe shaft Have axial grooves for lubrication by pump Have axial grooves for lubrication by pump
dischargedischarge Made of self-lubricating material Made of self-lubricating material May have stainless steel outer shellMay have stainless steel outer shell
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CharacteristicsCharacteristics
Self LubricatedSelf Lubricated Resist corrosion, erosion and do not support Resist corrosion, erosion and do not support
electrolysiselectrolysis Highly polished surface to reduce wear on Highly polished surface to reduce wear on
shaftshaft Withstand high temperatureWithstand high temperature Have good mechanical strength to withstand Have good mechanical strength to withstand
loading and torqueloading and torque
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Should have rigidity to reduce radial Should have rigidity to reduce radial movement, vibration & noisemovement, vibration & noise
Accommodate precision machining for tight Accommodate precision machining for tight clearance and correct alignmentclearance and correct alignment
Lend itself easily to custom modificationLend itself easily to custom modification Low wear giving longer service lifeLow wear giving longer service life ““Non-seizing” – i.e. will not seize on shaftNon-seizing” – i.e. will not seize on shaft
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DisadvantagesDisadvantages
Prone to cracks due to unbalance load Prone to cracks due to unbalance load Custom designCustom design High costHigh cost Plastic, elastomer, rubber will meltPlastic, elastomer, rubber will melt Cannot be repaired onboardCannot be repaired onboard