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Implement Alley Discussion Forum

How do you calibrate a spray rig

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Aowner

05-02-2006 18:35:47




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How do you guys calibrate your spray rigs? I need to spray a 25 acre pasture and was plannning on putting about 20 to 30 gallons per acre.




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Jerry/MT

05-03-2006 16:54:32




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 Re: How do you calibrate a spray rig in reply to Aowner, 05-02-2006 18:35:47  
I actually calibrate mine by a weigh method. I use the nozzle chart to give me a pressure so that I can spray 10 gal/acre of mix @5 mph with a given boom width. I then set that pressure and fill the sprayer with water and open the valve. I catch the water that flow from from each nozzle (one nozzle at a time since I have a small rig) for one minute in a jar. I weigh the water jar empty(I use my wife's kitchen scale) and then with the water that flowed into in in one minute. I subtract the tare weight of the empty jar from the weight of the collected water plus the jar to come up with the weight of water collected in one minute. Since water weighs 8.34 lbs per gallon, I divide the weight of the collected water, in pounds, by 8.34 and the result is the gallons per minute from each nozzle. Not surprisingly, the end nozzles flow less than the more inboard nozzles, but they generally all flow within about +/-2% of the boom average. By checking before the season, you can find bad or worn nozzles(yes they wear out) very easy by this method. I generally calibrate my rig at three pressures and draw a curve of total boom flow vs pressue and then I set my my pressure such that I get 10 gallons per acre of mix on the field at 5 mph. This is a very accurate method of calibrating a flow nozzle because it is a system calibration that is done in situ. The gauge, all the plumbing, valves, etc are exactly as you will use them in the field. I believe the the nozzle manufacturer's calibration is done in nozzle rig and does not duplicate your individual sprayer installation.

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RodInNS

05-03-2006 06:48:02




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 Re: How do you calibrate a spray rig in reply to Aowner, 05-02-2006 18:35:47  
I remember doing all that stuff in college that was mentioned below. Now I use the T-Jet chart. Every nozzle has a flow rating at a given pressure and speed. If you want to get real technical you can interpolate a different pressure/speed combination, but most people just use the standards on the chart. Figure out what tank size you have, how many acres it will cover, and add the appropriate amount of chemical for the acres that tank will cover. It's all pretty straight forward.

Rod

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davpal

05-02-2006 21:11:57




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 Re: How do you calibrate a spray rig in reply to Aowner, 05-02-2006 18:35:47  
It is actually pretty easy. Take the rig out on a gravel road somewhere or remote road. Figure out what mph you will be spraying, like 5 mph. Set the rpm of the tractor and pump psi where you have a nice spray pattern on the road, maybe 40 psi. Hang a bucket from one of the spray nozzels and go down the road for 1 minute and see how much water you have. Times that by the number of spray nozzels. If you use one quart per nozzel per mile and have 8 nozzels you will use two gallons per mile. If your sprayer is 20 feet wide you would cover 8800 square feet in one minute of driving. So assuming a acre is approximately 43,000 square feet you would cover an acre in about five minutes with that rig and use about ten gallons per acre. Not enough pressure on the nozzles for your 25 gallons per acre. So you would want each tip to give out about 2 and 1/2 quarts per mile which would end up being five gallons per mile for all the spray tips and five minutes of that would be 25 gallons on your acre of property and would take you about five minutes for each acre or approximately 125 minutes to spray your field with a 20 foot sprayer going 5 mph. I hope I didn't confuse you with this but that is how we start doing it and fine tune it from there. It is really just some math and figuring. Good luck.

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RickL

05-03-2006 05:26:39




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 Re: How do you calibrate a spray rig in reply to davpal, 05-02-2006 21:11:57  
43560 sq ft in acre



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Heat Houser

05-02-2006 20:32:32




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 Re: How do you calibrate a spray rig in reply to Aowner, 05-02-2006 18:35:47  
TeeJet



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