Mainline pressure loss
Hazen-Williams friction on PIP, IPS, or custom wall pipe.
Reid Bros. · American Irrigation · 9/19/2026
Yellow fields are inputs — everything else calculates live, same as the original workbook.
Pipe ID, in
7.658
Friction, ft
7.40
Friction, psi
3.20
Friction, bar
0.221
Velocity, ft/s
5.57
Velocity, m/s
1.696
Warning — velocity exceeds 5.0 ft/s. Increase pipe size or reduce GPM.
Warning — velocity exceeds 1.6 m/s. Increase pipe size or reduce flow.