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Kianco Group Resources Conversions Measurement Units and Conversion Factors of the Pump Industry Quantity (1) Typical Applications U.S. Customary Unit Unit Symbol Metric Unit Unit Symbol U.S. to Metric Metric to U.S. Space & Time volume per unit time flow rate of fluids gallon per minute gpm cubic meter per hour m3/h 0.2271 4.403 velocity, linear fluid velocity foot per minute fpm meter per second m/s 0.00508 (9) 196.9 foot per second fps meter per second m/s 0.3048 (9) 3.281 volume fluid volume capacity cubic inch in3 milliliter [cm]3 (2) mL (3) 16.39 0.06102 cubic foot ft3 cubic meter m3 0.02832 35.31 gallon gal cubic meter m3 0.003785 264.2 quart qt liter L 0.9464 1.057 length dimensions of sumps & pits foot(and inch) ft. or ' meter m 0.3048 (9) 3.281 in or " meter m 0.0254 (9) 1/0.0254 (9) mechanical engineering drawings inch in or " millimeter mm 25.4 (9) 1/25.4 (9) coating thickness, surface finish, filter particle size mil   micrometer µm 25.4 (9) 1/25.4 (9) microinch µin micrometer µm 0.0254 (9) 1/0.0254 (9) micron   micrometer µm 1 (9) 1 (9) area surface area, flow area square foot ft2 square meter m2 0.09290 10.76 square inch in2 square millimeter mm2 645.2 0.001550 acceleration   foot per second-squared ft/S2 meter per second squared m/S2 0.3048 (9) 3.281 Mechanics fluid energy head of fluid foot ft or ' meter m 0.3048 (9) 3.281 pressure fluid pressure or vacuum(NPSH) pound-force per sq. in. (psi) Ibf/in2 kilopascal [kN/m2] kPa 6.895 0.1450 inch of mercury [60°F] inHg kilopascal kPa 3.377 0.2961 inch of water [60°F] inH20 kilopascal kPa 0.2488 4.019 sound pressure level reference (4) microbar [0.0002µbar] µbar micropascal [20µPa] µPa 100,000 0.00001 specific speed centrifugal pump impeller     1.162 0.8608 specific speed centrifugal pump impeller UNITLESS (radians) 0.0003656 2735 viscosity, dynamic   centipoise cP millipascal-second mPa•s 1 (9) 1 (9) viscosity, kinematic   centistokes (5) cSt square-millimeter per second mm2S 1 (9) 1 (9) power(see also heat) mechanical power horsepower [550ft•Ibf/s] hp kilowatt [kJ/s] (6) kW 0.7457 1.341 mass equipment mass (weight) pound (decimalized; do not use ounces with pounds) lb or # kilogram kg 0.4536 2.205 ounce oz gram g 28.35 0.03527 density (mass density) density of solids & fluids pound per cubic foot lb/ft3 kilogram per cubic meter kg/m3 16.02 0.06243 moment of inertia (dynamic) rotor inertia pound foot-squared lb•ft2 kilogram meter-squared kg•m2 0.04214 23.73 energy, work(see also heat) force times distance foot pound-force ft•Ibf joule [N•m] (6) J 1.356 0.7376 force   pound-force (decimalized; do not use ounces) Ibf newton N 4.448 0.2248 moment of force, torque and bending moment bolt tightening, shaft torque, beam stress and deflection calculations pound-force foot Ibf•ft newton-meter N•m 1.356 0.7376 pound-force inch Ibf•in newton-meter N•m 0.1130 8.851 unbalance impeller, rotor ounce-inch oz•in gram-millimeter g•mm 720.1 0.001389 Heat temperature temperture degree Fahrenheit °F degree Celsius (7) °C (tF-32) x 5/9 (9) (tCx1.8)+32 (9) interval between two temperatures degree Farenheit [tF] °F kelvin [tK = tC] K 5/9 (9) 1.8 (9) heat(energy)   British thermal unit Btu (8) kilojoule kJ 1.055 0.9478 heat flow rate (power) heat rejection rate, air conditioning power British thermal unit per minute Btu/min watt [J/s] (6) W 17.58 0.05687   As used in ISO-31 and ISO-1000, "quantity" means "measurable property" Symbols in brackets, [ ], are explanatory only. The U.S. Department of Commerce, National Bureau of Standards, has established the capital letter "L" as the preferred unit symbol for liter for the U.S. The unit for sound level will continue to be the decibel (db), and will continue to have the same value because 20 µPa = 0.0002 µbar. Conversion from Saybolt Universal Seconds to centistokes can be done from a table. By using J instead of N•m, the distinction from N•m for moment of force is made apparent. Conversion requires a formula, wherin the Fahrenheit temperature is indicated by tF , and the Celsius temperature by tC. All factors in this table are based on Btu-International Table. Exact.

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