Efficient, reliable irrigation is essential in modern cotton production. When an expanding cotton farm in rural New South Wales discovered that the centrifugal pump for its new lateral move irrigator had been left off an overseas order, a three-month delay threatened irrigation schedules and crop timing. Working with Flowtech Irrigation, Brown Brothers Engineers Australia supplied a locally stocked replacement to keep the project on track.

Irrigation without a pump

The farm had recently converted dryland country to irrigated fields to support increased cotton production. As part of this expansion, a new lateral move irrigator was purchased from the United States to service the newly developed area. With the original pump missing and a long import lead time, the team needed a local solution capable of delivering high flow and head, with protection against dry running events. The typical pump supplied with the irrigator tolerates intermittent dry-running thanks to oil-bath components, making system safeguarding essential.

A locally available solution

Kiel O’Neil from Flowtech Irrigation Gunnedah oversaw the project. The Goulds GISO Series 250x200-400 bare shaft ISO pump, operating at 1500 rpm and supplied by Brown Brothers Engineers, was selected for its efficiency, durability, performance, and availability.

The Goulds ISO pump is engineered for high efficiency, reducing energy use and operational costs. This efficiency is particularly valuable for irrigation systems running for long hours, where even modest gains can yield significant savings. The pump is also capable of delivering the high flow and pressure required for large-scale irrigation, making it well suited to cotton farming. Sized to deliver 190 L/s at 50 m head, the pump operates efficiently within its safe range, with built‑in margin to handle start‑ups and flow fluctuations. Site suction conditions support reliable operation and the unit’s pressure and temperature ratings make it well suited to farm irrigation duties.

“A flow switch and a pressure switch monitor conditions and shut the pump down if prime is lost,” Kiel said. “That protection minimises the risk of damage from dry‑running and helps extend service life.”

Both the pump and motor are mounted directly on the irrigator. The motor drives both the pump and the irrigator’s travel, while a built-in clutch mechanism allows controlled engagement and disengagement of the pump from the motor as needed. This setup lets the irrigator move between paddocks without running the pump, reducing mechanical wear and saving energy.

The lateral system draws water from a nearby ditch replenished by groundwater bores and overland flows, providing a flexible and sustainable water source for the operation.

Commissioning Confirms Pump Selection

Beyond technical performance, the Goulds ISO pump offered a clear upfront cost advantage. It was around half the price of the typical imported model, while local stock held by Brown Brothers Engineers eliminated shipping delays. Installation and commissioning proceeded without issue.

At commissioning, the pump operated close to its best efficiency point (BEP), achieving 86.4 % efficiency at 196 L/s. This was slightly above the predicted performance for this installation. The result was faster irrigation cycles and more uniform water distribution across the expanded cotton area.

For time-critical agricultural projects, locally supported equipment helps mitigate supply risks without compromising performance. In this case, efficient pumping, dry-run protection, and integrated drive control delivered reliable irrigation while supporting lower costs and sustainable water use.

[Article originally appeared in the Irrigation Australia Journal]