Le = K × I.D.  
K = Configuration Constant  
I.D. = Fitting inside diameter measured in feet  
Le = Equivalent Tubing Length  
    K values (same size ends)  
    90° Elbow K = 30
    45° Elbow and Sweep elbow K = 16
    Tee (flow through run) K = 20
    Tee (flow through branch) K = 60

Specify K and I.D. to calculate tubing length

K = Configuration Constant
I.D. = Fitting inside diameter measured in feet
     
Le = Equivalent Tubing Length