This document discusses different types of pumps and their components, including centrifugal pumps, gear pumps, screw pumps, and mono pumps. It also describes pump bearings, noting that line bearings are used to keep the pump shaft steady and prevent damage. Common materials for line bearings include teflon, elastomers, polyester, carbon and simsite. The document outlines the characteristics of line bearings such as being self-lubricating and withstanding high temperatures and loads, as well as some disadvantages like being prone to cracking and having a high cost.

2. Centrifugal PumpCentrifugal Pump
 Impeller/Wear Rings/CasingImpeller/Wear Rings/Casing
 Wear & tearWear & tear
 ClearancesClearances
 ShaftShaft
 Wear & tearWear & tear
 AlignmentAlignment
 ““ringing” soundringing” sound

4. 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

6. 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

8. Mono PumpMono Pump
 Stator/rotorStator/rotor
 conditioncondition
 Safety valveSafety valve
 conditioncondition
 ShaftShaft
 conditioncondition

9. Pump & Line BearingPump & Line Bearing

12. Two Stage Single Impeller

13. Line BearingsLine Bearings
 TeflonTeflon
 ElastomerElastomer
 PolyesterPolyester
 CarbonCarbon
 SimsiteSimsite

14.  Provided in the volute cover/fitted onto theProvided 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 radialKeep shaft steady by taking up the radial
deflectiondeflection
 Will fail first, prevent further damages esp. toWill fail first, prevent further damages esp. to
the shaftthe shaft
 Have axial grooves for lubrication by pumpHave axial grooves for lubrication by pump
dischargedischarge
 Made of self-lubricating materialMade of self-lubricating material
 May have stainless steel outer shellMay have stainless steel outer shell

15. CharacteristicsCharacteristics
 Self LubricatedSelf Lubricated
 Resist corrosion, erosion and do not supportResist corrosion, erosion and do not support
electrolysiselectrolysis
 Highly polished surface to reduce wear onHighly polished surface to reduce wear on
shaftshaft
 Withstand high temperatureWithstand high temperature
 Have good mechanical strength to withstandHave good mechanical strength to withstand
loading and torqueloading and torque

16.  Should have rigidity to reduce radialShould have rigidity to reduce radial
movement, vibration & noisemovement, vibration & noise
 Accommodate precision machining for tightAccommodate 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

17. DisadvantagesDisadvantages
 Prone to cracks due to unbalance loadProne 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