Flygt Adjustable, Submersible Mixer For Adapting To Changing Loads, Seasonal Demands

Flygt Adjustable, Submersible Mixer For Adapting To Changing Loads, Seasonal Demands
Flygt 4320 from Xylem

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The Flygt 4320 low-speed, submersible wastewater mixer from Xylem features built-in speed regulation to optimize control over the mixer’s thrust for continuous process results and lower energy consumption. Adjusting thrust to meet changing loads or season variations can reduce energy cost by 50 percent. It also reduces stress and wear on the mixer during low power periods. Coupling an integrated drive with a synchronous motor, the mixer eliminates the need for an external variable-frequency drive.

“Our research and development team has succeeded in developing a mixer that offers optimum efficiency and simplicity of operation,” says Andreas Lindberg, product manager for mixers at Xylem. “A key reason for this is the mixer’s adjustability. Once installed, the mixer thrust or speed can be altered to that facility’s specific conditions; this can dramatically reduce energy consumption. Because motor speed can be altered when mixing demand increases or decreases, it future-proofs a facility’s mixing efficiency.”

Wastewater applications include activated sludge treatment, sludge holding tanks and digesters, as well as biogas applications. Mixers have a variable speed of up to 70 rpm and are available in two- or three-blade models with a range of propellers from 4.6 to 8.2 feet in diameter. The backswept design ensures clog-free operation.

“The propeller’s backswept blade design improves its ability to deal with material such as fibers or rags, which could cause the mixer to stop or result in reduced performance,” Lindberg says.

Speed controls can be adjusted using a small operator panel mounted tankside or in the control room for easy accessibility. Remote communication enables the mixer to be accessed from a central control system.

“Speed regulation is an integrated feature of the product,” he says. “The speed can be changed either via a simple keypad connected to the power cable’s control leads via Modbus remote communications protocol or via the power cable’s control leads.”

The mixer includes soft start and soft stop features that regulate motor revolutions, increasing the stability of the mixing system and reducing wear on mechanical and electrical components for longer life and reduced maintenance.

“Traditional mixers stop and start abruptly, which can place mechanical stress on installation equipment, as well as on the mixer itself,” Lindberg says. “Traditional mixers start ‘direct online’ with strong electric inrush current, which places higher requirements on cables and fuses. The Flygt 4320 has no inrush current and slowly increases speed to the required level, reducing wear on the mechanical and electrical equipment.” 855/995-4261; www.xylem.com/treatment.



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