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
Editor's Notes
Simsite® is a patented structural composite material …offered exclusively by the Sims Pump Valve Company. It is a graphite combination-fiber continuously interwoven reinforced composite with phenolic/epoxy thermoset resin. Simsite® is designed using fibers in an interwoven bi-directional or tri-directional weave. Continuous fibers provide the highest strength and flexibility available on the market today. As a heavy-duty structural composite its characteristics can be tailored by our patented process to accommodate the required structural strength of the parts being manufactured.
Simsite® composites stand up better to corrosive environments, erosion, and cavitation then metallics or other non-structural composites and will significantly improve pump performance. Beyond performance, a look at total costs reveals that Simsite® composites are an exceptional added value. An evaluation of maintenance, spare parts, inventory, and energy usage, shows Simsite® composites to be the best cost option for most pump applications.
Simsite®'s key benefits are its corrosion and erosion resistance, its cavitation resistance, its light weight (1/6 the weight of bronze) and it lasts 3-5 times longer than metallics. For more than 35 years SIMS has been manufacturing Simsite® pumps, impellers, bearings and rings of all sizes that exceed the performance of metallics in salt water and corrosive environments. Simsite®'s natural lubricity reduces wear on motors, bearings, and rings while providing quiet vibration free operation at a cost that is competitive with bronze.
