Air Velocity Calculator
    Change the numbers in the blue boxes to your application (inches only)

    Hole Diameter
    Drill Pipe O.D.
    C.F.M.
    Uphole Velocity (FPM)

    America West Drilling Supply (800) 800-8444
    3000 FPM is the preferred minimum
    If 3000 FPM cannot be acheived, try using foam.