Chiltrix Inc. www.chiltrix.com
Head Calculation Example:
To calculate the head pressure for the correct water flow, the pipe length must be measured and all fittings
counted. It is advisable to use flexible red oxygen barrier PEX piping and route it so as to avoid as many elbows as
possible.
All fittings have an equivalent length of pipe already calculated, available on the next page under PEX Fittings
Pressure Drops. Add up the equivalent length of pipe for the fittings, 13.8’ + 11.7’ =25.5’. Then, add this to the
actual pipe, 25.5’+115” = 140.5’ of 1” pipe. Once you know the total length of pipe, use a (1” PEX 10% Glycol, feet
of head per 100 feet of tubing chart), to get the head for 1’ of pipe, at 40°F and 4.76 GPM. This comes to (.0500)
feet of head per foot. 140.5 x .0500=7.02 ft. of head.
Add up all head calculations, 7.02 + 9.18 + 4.01 = 20.21 ft. of head. Next, we will look at the Wilo Pump curve on
page 13. Maximum head at 4.76 GPM is 23.67 ft.
If using the CX30SE (Free Cooling option) the CX30SE’s pressure drop is 4.5 PSI when active.
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