Designed, Engineered & Manufactured in the U.S.A.

Friction Loss in Fittings

Friction Loss in Fittings

SIZE FITTING 1⁄2" 3⁄4" 1" 1 1⁄4" 1 1⁄2" 2" 2 1⁄2" 3" 4"
Gate Valve (Full Open) 0.6 0.7 0.9 1.2 1.3 1.6 1.7 2.0 2.7
Elbow - 90° 3.6 4.5 5.3 6.7 7.5 8.6 9.3 11.1 13.1
Elbow - 45° 0.7 0.9 1.4 1.8 2.2 2.8 3.2 4.1 5.6
Tee (Straight Thru) 1.8 2.5 3.3 4.7 5.7 7.8 9.3 12.1 17.1
Tee (Thru Side) 4.3 5.4 6.7 8.8 10.0 12.1 13.0 17.1 21.2
Swing Check Valve 8.1 8.9 11.2 13.1 15.2 19.1 22.0 27.1 38.2

Head Loss Charts

Component GPM Head Loss (ft.)
Main Drain 1 1⁄2" Outlet 20 0.5
Main Drain 1 1⁄2" Outlet 30 1.0
Main Drain 1 1⁄2" Outlet 40 1.5
Main Drain 1 1⁄2" Outlet 50 2.0
Main Drain 1 1⁄2" Outlet 60 2.5
Main Drain 2" Outlet 40 1.0
Main Drain 2" Outlet 50 1.5
Main Drain 2" Outlet 60 2.0
Main Drain 2" Outlet 70 3.0
Main Drain 2" Outlet 80 4.0
Heater 7.0 avg.
Skimmer 1 1⁄2" Outlet 20 1.0
Skimmer 1 1⁄2" Outlet 30 2.0
Skimmer 1 1⁄2" Outlet 40 3.0
Skimmer 1 1⁄2" Outlet 50 4.0
Skimmer 1 1⁄2" Outlet 60 5.5
Skimmer 2" Outlet 20 0.5
Skimmer 2" Outlet 30 1.0
Skimmer 2" Outlet 40 2.0
Skimmer 2" Outlet 50 3.0
Skimmer 2" Outlet 60 4.0
Skimmer 2" Outlet 70 5.0
Skimmer 2" Outlet 80 6.0

Head Loss Charts - Cartridge Filters

Cartridge Filters GPM (.75) Head Loss (ft.)
25 sq. ft. 18.75 1.1
35 sq. ft. 26.25 2.0
50 sq. ft. 37.50 4.3
70 sq. ft. 52.50 7.5
75 sq. ft. 56.25 8.0
100 sq. ft. 75.00 17.5

Jet Flow Data

Jet orifices sized from ¾" to 1 ½" work better at a lower PSI. Use legend to size properly.