Irrigation Professionals with questions about ... - Hunter Industries

SummaryCalculating the friction losses for each zone may not be necessary, butcalculating the losses for each critical zone is. This step may be thedifference between a system that works efficiently after installation, andone that doesn’t work at all.Catching a mistake while in the design process means simply redesigningthe system. Finding a mistake during installation which causes theaddition of zones not included in the estimate can mean lost profits. Andworse yet, being called back onto a project with a sprinkler system thatfails shortly after completion can be very costly.Calculating the actual dynamic pressure as designed is an important partof the design process. The more accurate the design and the friction losscalculations, the more likely the system will operate efficiently.What You Need to Know Check to be sure that the PSI losses on your designs do not exceed theavailable PSI for the system (see line #20, Dynamic Pressure at DesignCapacity, at the POC, in the Design Capacity section). If the pressure losses do exceed the available dynamic pressure, resizethe pipe, valves, and other components as necessary. After resizing, be sure to recalculate the system’s friction losses. If resizing does not bring the system into the correct operating pressure,you may need to eliminate heads from the zones, and add more zones. Friction Loss Calculations worksheets are included (next few pages) tomake these calculations easier for you.