Flygt N 3306

The Flygt N 3306 pump series delivers reliable, energy-efficient performance for continuous pumping in municipal pump stations, stormwater, treatment influent and effluent, raw water intake, irrigation, dry docks and more. Options include premium-efficiency motors, explosion-proof pump versions, and N-hydraulics in Hard-Iron or grey iron. 

Flygt N 3306 pumps can also be delivered for submersible, vertical dry, or horizontal dry installation (configurations P, S, T, and Z).

Industry-leading N-technology hydraulics 

Thanks to the sustained high efficiency of self-cleaning N-hydraulics, Flygt N-pumps consume up to 25% less energy than pumps with traditional hydraulic designs. That adds up to significant energy cost savings over the lifetime of the pump.

Most solid objects entering the N-pump will pass through the impeller between the impeller vanes. For soft, stringy fibers that may enter the pump, backswept leading edges on the impeller vanes sweep solids away from the center of the impeller to the perimeter, where they are caught inside a relief groove and pushed out of the pump.

Due to the mechanical self-cleaning design, a sludge concentration up to 8% can easily be pumped.

For abrasive or corrosive pumpage, Flygt offers N-hydraulics in a 60 HRC Hard-Iron that has demonstrated five times greater wear resistance compared to standard grey iron material.

Energy-saving closed-loop cooling 

Flygt’s internal closed-loop cooling system provides reliable motor operation while reducing energy consumption and also allows for the use of premium efficiency motors. Heat from the stator is transferred to the coolant, which then circulates through the inner and outer cooling jacket and transfers the heat to the pumped media. Because the cooling system is completely sealed off, it is insensitive to impurities in the pumped media. 

Proven construction and components

Flygt N 3306 pumps integrate the motor and hydraulics into one compact unit that can be customized to pump station requirements. Key features include:

• Non-clog N-impeller in Hard-Iron or hardened grey iron 
• Replaceable wear ring in Hard-Iron or grey iron 
• Short shaft overhang, reducing shaft deflection and increasing seal and bearing life
• Motor designed for submersible use, with Class H insulation and heat losses concentrated around the stator core for improved cooling properties (Option to upgrade to IE3-comparable premium efficiency motor.)
• Two sets of mechanical shaft seals that work independently to provide double the security, available in tungsten carbide (WCCR) or silicon carbide (SiC)
• Active Seal micro-pumping grooves on the inner seal for zero leakage into the motor 
• Thermal sensors in the stator windings; analog temperature sensor for the lower bearing; leakage sensors in the stator housing and junction box; and 3-axis vibration sensor – all as standard. Temperature sensor for the upper bearing as an option
• Flexible cooling options, including internal closed-loop cooling, direct cooling or for warm-liquid applications, external cooling
• SUBCAB^® motor cable specially developed for submersible use
• Flygt MAS 801 pump monitoring system option for a proactive approach to pump station diagnostics

Flexible installation options

Flygt N-technology pumps are suitable for submerged or dry installation. Installation packages include key accessories and components to facilitate site-specific requirements and reduce installation costs. 

Wet Pit (P)

​​Semi-permanent, submersible pump installation. Wet pit arrangement with the pump installed on twin guide bars with automatic connection to the discharge pipe.​​

Portable (S)

​​​Portable, submersible pump installation. Portable pump with hose coupling or flange for connection to the discharge pipe.​​

Dry Installation vertical (T)

​​​Vertical, permanent, dry pump installation. The submersible pump is installed in a dry pit, with flange connection to suction and discharge piping.​​

Dry installation horizontal (Z)

​​​Horizontal, permanent, dry pump installation. The submersible pump is installed in a dry pit, with flange connection to suction and discharge piping. Optional sled mounting system provides safe, easy access for servicing the drive unit and impeller.

Pump station design expertise

​​One of the biggest challenges in pump station design is achieving a balance between efficiency and performance. A key focus is getting the best possible inlet conditions while minimizing sedimentation and pump station size. Other critical factors include the number, type and arrangement of pumps; variable flow conditions in the approach area; the geometry of the structure itself; and other site-specific factors. It’s also vital to consider and plan for pump control and access for equipment service.

Xylem engineers have decades of experience in wastewater handling. Whether you’re looking for a standardized or custom pump station design, we can help you find the best solution for your project’s needs.

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