Lateral Friction Loss

The Equation

This calculator uses this formula to determine the Total Flow Rate, Total Pipe Length, and Friction Loss.

Total Pipe Length

Where:

= Total Pipe Length (ft)

= Number of sprinklers per line

= Distance between sprinklers, sprinkler spacing (ft)

Total Flow Rate

Where:

= Total Flow Rate (gpm)

= Sprinkler flow rate (gpm)

= Number of sprinklers per line

Lateral Friction Loss

Where:

= Friction Loss (psi)

= Total Flow Rate (gpm)

= An arbitraty number to account for the pipe type (Plastic: 150, Aluminum: 120)

= Pipe Size (in)

= Total Pipe Length (ft)

= Number of sprinklers per line

Reference: Washington State University