CALIBRATION - LESSON 3 MATCHING FLOW TO A NOZZLE-TIP

CALIBRATION Lesson 3 - 

From lesson 2 we determined speed in m/min or km/hr.

You should be able to see that the sprayer is creating a rectangle as it travels in a straight line.

From the example the sprayer covered 120 metres every minute and each nozzle was spraying 0.5 metre wide. This created a rectangle with an area of 60 m²     

CALCULATE: 120 m x 0.5 metres = 60 m² (60 square metres) NOT 60 METRES SQUARE!

From lesson 1 the farmer wanted to apply DESTROY herbicide in 100 litres per hectare.

We know one nozzle covers 60 m² every minute so how many 60 m² blocks or unit areas makes up a hectare? 

CALCULATE: 10'000 m² divided by 60 m² or 10'000 / 60 = 166.7 blocks.

The farmer wants 100 litres to cover each hectare so what volume covers each 60m² block. Remember each block of 60 m² took 1 minute. CALCULATE: 100 litres spray mix divided by 166.7 blocks = litres for each block per minute.

OR litres / min = 100 / 166.7 = 0.6 l/min/block

TRICK QUESTION: DOES IT MATTER IF YOU USE 1 NOZZLE OR 20?

We have now determined the flow rate of a nozzle to achieve 100 l/ha travelling at 7.2 km/hr. Notice any fancy formulas? None!

The next step is to get hold of a catalogue and work through the flat fan nozzles to find the one that best matches the situation.  Take a look at the table below.

EXAMPLE: AIXR TeeJet - Air Induction Extended Flat Spray spray-tip.

TIP CODE : AIXR110015VP operating at 3 bar will do the trick. Spaced at 0.5 m or 50 cm and travelling at 7 km/hr achieves 101 litres per hectare. CLOSE ENOUGH.

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