Sprayer set up...I need help

I have a 3 point boom sprayer, 27 foot booms, 17 nozzles spaced about 20 inches. I have always rented a boomless sprayer in the past. I have put a new pump, strainer, and several new fittings and nozzles on the sprayer. I have been reading extension publications about calibrating it, but I am confused. I will be applying grazon. I have always mixed 2.5 gallons to 100 of water for 10 acres, which equals 2 pints grazon per acre. I am using the green teejet nozzles, which should give me .13 GPM at 30 psi. Do I need to set the regulator so I have 30 psi coming up to the valve? Seems lower than sprayers I have used before. Also, in all the GPA calculations I have seen, none of them ask how many nozzles I have, just nozzle spacing. How does that work. Thank you in advance for any help.
 
I tie empty water bottles on the nozzles to collect the fluid coming out of the tips at the pressure I want. I time the tractor's travel over a known distance. By measuring the collected fluid and setting down with pen and paper i can determine how much chemical I am putting down per acre. We try to put out ten gallons of solution (grazon + Water) per acre.

Once you know your solution rate per acre; you can do the math to get the recommended rate of Grazon per acre.

To get the ten gallons of solution per acre you might have to change tip size or shift gears.
 
A tee jet catalog will tell you the rates for different pressures and ground speed. You might want to read the material to determine the specs for your tips.
 
Do what Rusty said. There's no such thing as 10 gallon,or 20 gallon,or any other pre determined rate of nozzle. They have to be calibrated like Rusty says.
 
Calibrating a sprayer is not hard...just takes some math. Assuming the tank is marked in gallons, fill to whatever level with WATER, note that. Drive a given distance, like a quarter mile. Note the lower water level, in gallons. Measure the boom width, in feet. 33 foot boom, driving a quarter mile, is one acre. Different boom length, just do the math to figure your gallons per acre. Then you now how to mix chem accordingly...just maintain same pressure and tractor speed as you did in the test. Since it"s water you"re spraying, heck, you can go right down the road if you don"t have a field of a quarter mile!
 
Here is the simple 1/128 acre formula I have used for 35 years. NO math required. For a 20" tip spacing (doesn't matter number of tips)drive 204 feet in the gear and RPM that you want and time it for that distance.Then sitting still measure output from one tip in a calibrated container for the amount of time it took to drive 204 feet. One second equals one gallon per acre. Check several tips.

So simple a fifth grader could do it. So don't let me down.
1/128 th short cut
 

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