Xylem Flygt - Model N 3400 -N-Technology Water & Wastewater Pumps

• Flows up to 3200 m3/h
• Heads up to 43 m
• Power ratings 30 – 310 kW
• Discharge connection 400 mm
• Medium voltage motors up to 6.6kV available

Flygt N-pumps are equipped with the industry-leading N-technology hydraulics to take on the toughest applications and get the job done. Thanks to the N-hydraulics, neither hard solids nor soft, elongated fibers are a match for the N 3400 pump.

Most solid objects entering the pump will pass through the impeller between the impeller vanes. If an object gets caught on the leading edge of one of the vanes, it will slide along the backswept shape towards the perimeter of the inlet, where it is caught in the 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 and corrosive environments, N-hydraulics are available in Flygt’s Hard-Iron. The 60 HRC, high-chromium-content material which has demonstrated five times greater wear resistance than standard grey iron.

Flygt’s internal closed-loop cooling system provides reliable motor operation in dry, partially submerged and fully submerged applications. 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. The freeze-proof glycol cooling liquid allows operation down to -45°C.

From the motor and seals to the shaft and impellers, every component in a Flygt N-pump is designed and manufactured for optimum performance and extended service life.

• Self-cleaning 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 of medium voltage motor up to 6.6 kV to reduce current and motor cable size
• Two sets of mechanical shaft seals 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
• Available with Flygt MAS 801 pump monitoring system for a proactive approach to pump station diagnostics

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

​​Semi-permanent, submersible pump installation. Wet pit arrangement with the pump installed on twin guide bars with automatic 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 optimization
Managing large quantities of water places a high demand on reliable, energy-efficiency operation. When pumps are operating continuously, every percentage point of efficiency can generate energy savings, and every unexpected event adds operational cost and interrupts service. 

A well-designed pump station allows pumps to deliver their best efficiency and service life. A pump sump should provide the best possible inlet conditions for the pumps while minimizing sedimentation and pump station size. 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 must be evaluated. 

Xylem engineers have been researching and designing pump stations for decades. Whether you’re looking for standardized or custom pump station designs, we can help you find the best solution for your project's needs.