Kirkwood Formula Converter
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Mixing Fundamentals – Terminology and Formulas
Download Mixing Fundamentals – Terminology and Formulas
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Motor Terms
| AMPERE: A unit of intensity of electric current being produced in a conductor by the applied voltage.
FREQUENCY: The number of complete cycles per second of alternating current; e.g., 60 Hertz. HORSEPOWER: The rate at which work is done. It is the result of work done (stated in foot-pounds) divided by the time involved. INERTIA: The property of physical matter to remain at rest unless acted upon by some external force. Inertia usually concerns the driven load. MOTOR EFFICIENCY: A measure of how effectively the motor turns electrical energy into mechanical energy. Motor efficiency is never 100% and is normally in the neighborhood of 85%. POWER FACTOR: The ratio of the true power to the volt-amperes in an alternating current or circuit or apparatus. |
SERVICE FACTOR: A safety factor in some motors which allows the motor, when necessary, to deliver greater than rated horsepower.
SYNCHRONOUS SPEED & SLIP: The speed of an a-e motor at which the motor would operate if the rotor turned at the exact speed of the rotating magnetic field. However in a-e induction motors, the rotor actually turns slightly slower. This difference is defined as slip and is expressed in percent of synchronous speed. Most induction motors have a slip of 1-3%. TORQUE: That force which tends to produce torsion or rotation. In motors, it is considered to be the amount of force produced to turn the load. It is measured in lb.-ft. VOLTAGE: A unit of electro-motive force. It is a force which, when applied to a conductor, will produce a current in the conductor. |
Basic Formulae and Symbols
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PUMP SYMBOLS GPM = gallons per minute Lb = pounds Hr. = hour Sp. Gr. = specific gravity H = head in feet psi = pounds per square inch In. Hg. = inches in mercury hv = velocity head in feet V = velocity in feet per second g = 32.16 ft./sec.2 (acceleration of gravity) A = area in square inches I.D. = inside diameter in inches BHP = break horsepower Eff. = pump efficiency expressed as a decimal N = speed, RPM Ns = specific speed Nss = suction specific speed D = impeller in inches NPSH = net positive suction head NPSH^ = net positive suction available Pa = atmospheric pressure in psia Pvp = vapor pressure in psia w = specific weight of liquid in pounds/cu. ft. hs = total suction head ft. Q = capacity in GPM |
