4.8 Selecting Nozzles from the Nozzle Catalogue - Airblast sprayers

We need to select hollow cone discs with a core or whirl plate.

Nozzle output is based upon gallons/acre required above.

WHERE GPM = total sprayer output in gallons/minute mph = travel speed in miles per hour row width = width between rows of trees in feet 495 = a mathematical constant to correct units of measurement

Example Take the example of the dilute application in a well pruned orchard. We need to apply at 136 gallons/acre. We have an airblast sprayer with 7 nozzles each side and a comfortable forward speed for our ground conditions is 3mph. Rows are 18 feet apart.

GPM = 7.42 per side

GPM per nozzle = 7.42 divided by 7 nozzles = 1.06 As an example, using the hollow cone nozzle table in the Spraying Systems catalogues: # 49A, pages 40-41, #49, pages 38-41 or # 201, pages 10-11

Read along the pressure row at the top of the table. Read down the column for 80 psi until you read 1.07 gpm, look across to the left, you will see we need a D10 disc with a DC25 wirl plate or core. Alternatively you may read down the column for 60 psi until you read 1.04 gpm, look across to the left and you will see we need a D8 disc with a DC45 wirl plate or core.

Please note: Where trade names appear, no discrimination is intended and no endorsement by the author or Cornell University is implied.

A better alternative to consider would be to use a one-piece hollow cone nozzle tip. These one-piece tips are easier to fit into the cap and are much easier to remove for cleaning, changing tips etc.

Example To continue with the worked example from above for a nozzle tip with a flowrate of 1.07 gpm. As an example, using the Conejet hollow cone nozzle table in the Spraying Systems TeeJet catalogues: # 49A, page 39, or # 202, page 15 Read along the pressure row at the top of the table. Read down the column for 240 psi until you read 1.05 gpm, look across to the left, you will see we need a blue TXVK-26 one-piece nozzle.