2 External Gear PumpInternal Gear PumpObjective: Compare the two pumps
3 External Gear Pump Been around since the beginning oil pump industry Used for high pressure applications (pulse free fluid flow)Smaller - operate at rpm or rpmLarger operate 640 rpmCan handle viscous and water type liquids wellThick liquids speed must be properly set (small meshing time)True involute gear form (contour gear curved)
4 Internal Gear Pump Crescent pump Less than 100 years old Generally run at rpmSmaller ones run at rpm (same as external)Fairly long meshing time (allowing higher speeds with thicker fluids than external)Not true involute gear form$$$
5 Pump Handling Comparison Difference in Pressure MaterialsMetals of various types and hardness through to plastics of various types and hardnessMetal allow for high temperatures and aggressive productsPump Handling ComparisonAbrasivesThin liquidsViscousSolids DryDifference in PressureInternalGoodExcellentPoorAverageExternal
6 Stack Up References Internal pump, more modern pump Both have a pulse free fluid flowExternal pump, cheaperExternal pump has to run slower with thicker fluidsExternal involute form allows for less wear and tearInternal pump handles abrasive and viscous fluids a lot betterReferences
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