Nozzle Output: Turn Rate, Speed and Spacing Into Flow

Application volume, travel speed and nozzle spacing determine how much liquid each nozzle must deliver. The nozzle chart then shows which size and pressure can supply that flow.

For an evenly spaced broadcast boom using US units: US GPM per nozzle = US gallons/acre × mph × spacing in inches ÷ 5,940.

The example calculates equipment output; it is not a recommended chemical rate. The product label establishes the application requirements.

Pressure changes flow and droplets together

With the required 0.673 US GPM established, the next step is the selected nozzle’s actual chart. Its size and pressure row supplies the flow, and the droplet chart describes that same operating condition.

Raising pressure can increase output while changing droplet behaviour. A different orifice size provides another output range without relying on a pressure outside the model’s operating window.

The gallon and speed units belong to the equation

The 5,940 constant uses US gallons, miles per hour and inches. Imperial gallons and kilometres per hour require different conversions. A metric flow chart can be compared with the converted 2.55 L/min result above.

The installed nozzle provides the final measurement

A clean-water collection test at the working pressure establishes the output actually being delivered. A measured collection interval converts the collected volume back into flow per minute.

Differences between nozzles can reveal wear, obstruction, pressure variation or mismatched components. Those observations connect the manufacturer’s chart to the condition of the installed boom.

Sources and product information

• Pentair Hypro GuardianAIR model information
• Pentair Hypro 3D model information
• Lechler manufacturer calibration explanation

Technical review: November 4, 2026.