HINTS AND RULES / PUMPS
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Pumps

  1. Power for pumping liquids:
    Power, hp = (gpm)(psi difference) / (1,714)(fractional efficiency)

  2. If pump damage is to be avoided, normal pump suction head (NPSH) must be in excess of a certain number, depending on the kind of pump and conditions, as given by the supplier.
    NPSH = (pressure at the eye of the impeller - vapor pressure) / (density) The common range is 4-20 ft.

  3. Centrifugal pumps: Use single stage for 15-5,000 gpm, 500 ft maximum head; multistage for 20-11,000 gpm, 5,500 ft maximum head. Efficiency is 45% at 100 gpm, 70% at 500 gpm, 80% at 10,000 gpm.

  4. Axial pumps are for 20-100,000 gpm, 40 ft head, 65-85% efficiency.


HINTS AND RULES
Drying and SolidsConveyors for Particular SolidsCooling TowersCompressors and Vacuum PumpsCrushing and Grinding
Extraction, Liquid-LiquidCrystallatisation from SolutionFiltrationHeat ExchangersMixing and Agitation
Particle Size EnlargementpipingPumpsReactorsRefrigeration
Size Seperation of ParticlesUtilities, Common SpecificationsVessels (Storage Tanks)

The information is arranged by commonly recognised categories. In some instances, definitions and general statements have been included for clarity.