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Old 06-20-2013, 06:49 PM
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Ric Ric is offline
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Join Date: Sep 2001
Location: S W Florida
Posts: 11,996
Originally Posted by LawnsharkMB View Post
I want to be able to spray up to 2 gallons per 1000sq ft. The z sprays have 4.1 gpm pumps. I just thought I would need a better pump if I wanted to spray higher volumes.
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Until you do the math you don't know what you need. If you go slow enough you can put down a 6 inch wide strip with a Trigger sprayer and get 2 gallons per thousand calibration.

How fast or slow does your Mower travel??

How wide is the desired length of the Boom??

Then that will tell you the size pump you need.

My Walker travels 4 MPH or 88 ft X 4 = 352 ft per minute

My Boom is 42 inches or 3.5 ft wide.

352 ft X 3.5 ft = 1232 sq ft per minute. By using the correct size nozzles and adjusting the PSI, I spray approx one gallon per thousand sq ft with a 2.1 GPM Open flow 12 V pump. When I increase my PSI to 40 to get atomization of my spray, My GPM decrease to 1.25 GPM.

Hopefully my example will get you thinking correctly. Building and Calibrating a boom sprayer takes a little Knowledge and a lot of Common Sense. If you don't have either, don't jump in the water.


it is one thing to do a off label applications. It is total stupidity to post it on the world wide web and expect people to approve.

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