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.