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Not all applications are created equal.  Elevated temperatures, increased pressures, abrasion, corrosion, increased capacities, and high viscosity liquids are just a few of the problems fluid handling engineers may encounter.  Fortunately, rotary pumps are versatile and can be adapted to overcome such challenges.

Please browse our library of topics below.  Check back periodically as Professor Pump adds more topics and tough applications to the list. If you have an idea for a topic or liquid not adequately covered here, please send your idea to Suggest A Topic.  Professor Pump will evaluate all ideas and respond to the ones which benefit the widest range of audiences. For help with unique challenges, contact the professor directly at Ask Professor Pump.

Handling Abrasive or Corrosive Liquids (.pdf)
  Handling abrasive liquids such as paint, ink, waste oils, and filled polymers are core applications for rotary PD pumps.  As are corrosive liquids such as acids.  This document details construction and handling considerations to employ for these tough applications.
Efficiency and Life Cycle Costing  (.pdf)
  At the date of purchase, all too often the hidden costs of maintenance, repair parts, and energy are overlooked even though they can account for 70-90% of the total life cycle cost of a pump.  This document focuses on the high cost of energy over the life of a pump and examines some solutions to combat it.
Fluid Power and Rotary Gears (.pdf)
  A site devoted to rotary PD technology would be remiss not to mention the significant role gear pumps play in the hydraulic industry.  This document examines the PD gear's role as a hydraulic pump, hydraulic motor, and rotary flow divider.  Of course this only scratches the surface of this much broader topic.
Pumping Fuel and Fuel Oil (.pdf)
  Refining, transferring, and dispensing fuels is one of the most common applications of rotary PD pumps.  This document highlights several different fuels and applications, varying from diesel fuel, to bunker C, to LP gas.
Pumping High Temperature Liquids (.pdf)
  From handling room temperature solids like asphalt, bitumen, sulfur, or wax to handling heat transfer oils which can be upwards of 750F / 400C, this document covers the full spectrum of construction and handling considerations necessary for pumping these difficult liquids.
Net Positive Suction Head (.pdf)
  This document explains in plain language the often misunderstood subject of NPSH and its effect on rotary PD pumps.  This document should answer:  "What is NPSH?",  "How do I calculate it?", and most importantly, "What can I do if I already have an NPSH problem?"
Liquid Containment (.pdf)
  From simple shaft packing to single face mechanical seals, to sealless magnetically coupled pumps, this document outlines the various liquid containment options for rotary pumps.
Shear Sensitive Liquids (.pdf)
  Perhaps no other topic is as misunderstood as shear.  This document clearly and succinctly explains how shear is defined, the various types of shear sensitive liquids


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