You can calculate the cost of energy through the following formula:
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Fluid: If the pump will see viscosities above 20 centistokes (cst), entrained gas or pump shear sensitive fluid, a positive displacement pump should be considered for its efficiencies of operation and ability to pass fluid with minimum change or impact. Two and three-screw pumps may be the best choices. | ![]()
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Suction: If the pump has varying supply conditions, a positive displacement pump is recommended due to its versatility in handling a wide range of NPSHA (net positive suction head available), fluid characteristics plus its ability to efficiently vary speed. |
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Discharge: If the system has varying pressure requirements, a positive displacement pump offers versatility and efficiency. | ![]() |
Operation: If the specific application requires occasional or frequent demand changes in flow and pressure, a positive displacement pump will respond immediately and efficiently, and operates well at varying speeds. |