Tech Data

Equations

Symbols

Tech Data GPM = gallons per minute
Tech Data CFS = cubic feet per second
Tech Data Lb. = pounds
Tech Data Hr. = hours
Tech Data BBL = barrel (42 gallons)
Tech Data Sp.Gr. = specific gravity
Tech Data H = head in feet
Tech Data psi = pounds per square inch
Tech Data In. Hg. = inches of mercury
Tech Data hv = velocity head in feet
Tech Data V = velocity in feet per second
Tech Data g = 32.16 ft/sec2 (acceleration of gravity)
Tech Data A = area in square inches
Tech Data I.D. = inside diameter in inches
Tech Data BHP = brake horsepower
Tech Data Eff. = pump efficiency expressed as a decimal
Tech Data Ns = specific speed
Tech Data N = speed in revolutions per minute
  v = peripheral velocity of an impeller in feet per second
  D = Impeller in inches
  Nc = critical speed
  f = shaft deflection in inches
  v = peripheral velocity of an impeller in feet per second
  P = total force in pounds
  L = bearing span in inches
  m = constant usually between 48 and 75 for pump shafts
  E = modules of elasticity, psi – 27 to 30 million for steel