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Old 05-23-2013, 12:46 PM
goodmatt78 goodmatt78 is offline
LawnSite Member
Join Date: Mar 2010
Location: ohio
Posts: 18
Tuning new system - PR questions

I just installed a system using PGP rotors and red nozzles. I have static of 45 psi and 12 GPM (on interior 1/2" line hose bib)...exterior main line is 1" and we are tapped in a within 1 foot of that entering the house with 1" to supply the system.

I balanced the system and plan to do an audit this weekend to better determine the watering duration.

Currently I use the following nozzles:

90deg - #2
180deg - #4
270deg - #5-6
360deg - #7

Irrigation tutorial suggests: #3,#6,#8,#9

I am almost exactly 75% of the GPM recommended on irrigation tutorials.

Currently running 25min/zone w/ 6 zones and 4 heads per zone. My most exhausting zone is at 8.4 GPM now (charted for 40psi).

I plan to renozzle a zone this weekend to see if I can bump up nozzles without ill effects from pressure drop.

Currently I show about 40 psi on a hose bib while running the system. I figure I am probably already below 35psi at the heads. Sound about right? Therefore, I am not sure if I can up my nozzles more.

What PR should I be aiming for. Around .5 in/hr?

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