CALIBRATION LESSON 4 - How much product to put into the tank.

CALIBRATION - Lesson 4 CALCULATING HOW MUCH TO PUT INTO THE TANK.

Well you've found the right nozzle tip and for the moment let's assume you bought them from Chemicon.

The final bit of information relates to the spray-tank and how much product to put into the tank.

In our example we mentioned a boomsprayer with a 600 litre tank. The farmer wanted to spray at 100 l/ha so how many hectares can be sprayed with a tank. CALCULATE: 600 litre tank divided by 100 l/ha = 6 hectares. OR ha's that can be sprayed with 600 litre tank is 600/100=6 ha.

If the label specifies a rate of 6 litres per hectare then you need to add 36 litres to the tank.

CALCULATE : 6 l/ha x 6 ha =36 litres

Provided you maintain the correct pressure and speed the sprayer will deliver 100l/ha.

WATCH OUT: NOTE THE 36 LITRES THAT WAS POURED INTO THE TANK IS PART OF THE 600 LITRE USABLE VOLUME. THERE ARE INDIVIDUALS WHO THINK THAT THE 36 LITRES IS ADDED TO THE 600 LITRES. IT HAPPENS.

IMPORTANT: IS THE SPRAYER EQUIPPED WITH A PROPER WORKING PRESSURE GUAGE? "THE GUAGE DOES NOT GO OVER 2 BAR BUT THE PUMP CAN SPRAY 40 BAR. SOMETHING IS WRONG WITH THE PUMP?" SAYS THE CLIENT. 

WHEN CHECKED, THE CLIENT WAS SOLD A GUAGE DISPLAYING MEGAPASCALS.   IT HAPPENS.   SEE BLOG POST ABOUT PRESSURE IF YOU HAVE NOT READ IT ALREADY.

IMPORTANT: IS THE SPRAYER EQUIPPED WITH PROPER WORKING PRESSURE REGULATOR. " I CAN'T SET THE PRESSURE. IT WON'T GO OVER 5 BAR." SAYS THE CLIENT.

IF THE POSITIVE DISPLACEMENT PUMP'S VALVES ARE NOT SEALING PROPERLY THE PRESSURE IS LOST THROUGH THE INLET VALVES OR THE PUMP CRANK-CASING MAY HAVE CORRODED THROUGH AND PRESSURE IS LOST INTO THE SUCTION SIDE. IT HAPPENS.

And to your left the real world.


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