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PGG Wrightson Seeds, one of New Zealand’s leading seed suppliers, operates gravity tables to sort and clean seed. As part of its commitment to providing a safe workplace and reducing environmental impact, PGG Wrightson Seeds engaged Vortex Engineering to design a cleaner, more energy-efficient dust control solution.
Following a site review in April 2025, Vortex outlined a plan to install two large extraction hoods over the gravity tables and connect them to a high-capacity reverse air baghouse. This design uses a gentle cleaning action, so it doesn’t require compressed air, minimises energy use, and extends filter life.
Vortex’s internal process includes producing layout drawings, carrying out a safety- in-design review and working through final design, manufacture and testing to New Zealand/Australian standards.
Solutions
- Baghouse and fan: Provide and install an RAF5+1 reverse air filter (about 54 000 m³/h capacity) together with a 75 kW FA1120 extraction fan fitted with an ABB variable speed drive.
- Hoods and ducting: Fabricate two extraction hoods above the gravity tables and connect them via 1 000 mm ductwork to the fan and from the fan to the baghouse, including all supports and fittings.
- Discharge system: Fit a rotary valve, discharge bin cover and conveyors to move collected dust into PGG Wrightson’s bins.
- Control and instrumentation: Supply a PLC based control panel, differential pressure monitoring and explosion protection features such as panel doors and a reverse flow damper.
The project is underway, and installation is scheduled for December 2025.
26 Nov 2025 Project Update
Painting is now complete, and the unit has passed initial testing. It is being prepared for dispatch to site.
