The most common pitot tube pump commercially available is an overhung rotor arrangement with a coaxial suction and discharge. This whitepaper by Weir discusses how this arrangement has a large impact on the Net Positive Suction Head required (NPSHr) by the pump. Often the NPSHr must be increased substantially when pumping fluids with steep vapour pressure curves such as light hydrocarbons...
 

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Often the NPSHr must be increased substantially when pumping fluids with steep vapor pressure curves .
Often the NPSHr must be increased substantially when pumping fluids with steep vapor pressure curves .