Flygt N-Technology Pumps Flygt N 3171

The Flygt N 3171 medium capacity pump series delivers outstanding, cost-effective performance for a variety of water and wastewater applications. It provides exceptional media handling capabilities, featuring explosion-proof versions and impeller material selection from Hard-Iron, grey iron or stainless steel.

Flygt N 3171 pumps can be delivered for submersible or dry installation (configurations P, S, T, Z).

N-Technology Hydraulics for Trouble-Free Pumping

With a self-cleaning impeller design, Flygt N-pumps deliver clog-free pumping and sustained energy efficiency.

Today’s wastewater often includes heavy loads of non-organic, stringy solids that can clog conventional pumps. Flygt N-technology sweeps objects through the pump to prevent build-up that would otherwise reduce pump efficiency.

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 toward the perimeter of the inlet and be guided out through the relief groove.  

Due to the mechanical self-cleaning design, a sludge concentration up to 8% can easily be pumped and unplanned maintenance is significantly reduced.

Impeller Materials for Tough Applications

Wastewater chloride content, pH value, temperature, oxygen content, abrasives and flow are all factors that should affect the selection of impeller materials.

For typical wastewater applications with low amounts of corrosives, hardened grey iron impellers are suitable. For abrasive and corrosive applications, Flygt’s Hard-Iron (60 HRC) impeller has demonstrated five times greater wear resistance compared to standard grey iron material. A duplex stainless steel impeller is available for applications requiring a high resistance to corrosion.

The replaceable impeller wear ring is available in both grey iron and Hard-Iron.

Efficient Cooling

Flygt mid-range N-pumps come standard with an advanced closed-loop cooling system suitable for dry, partially submerged, and fully submerged applications. Flygt’s closed-loop system uses a precise mixture of pure water and a proprietary polypropylene glycol formulation. It has excellent heat transfer and corrosion resistance properties and is freeze-proof down to -45°C.

Designed To Endure

Flygt N 3171 pumps offer a modular hydraulic design for customization to application needs, along with a robust set of features to ensure long-term operational reliability.

• Self-cleaning N-technology impeller in hardened grey iron, Hard-Iron or duplex stainless steel
• Replaceable wear ring in grey iron or Hard-Iron
• Chopper ring option for applications where cutting is required due to long fibers and solids
• 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
• Cooling via internal closed-loop cooling system, direct cooling or for warm-liquid applications, external cooling
• Flygt Plug-in seal with Active Seal system for greater sealing reliability and zero leakage to the motor. Available in Tungsten carbide (WCCR) or Silicone carbide (SiC) depending on pumped media
• Flygt Spin-out seal protection option to prevent seal wear caused by abrasive particles
• Inspection chamber and built-in sensor for early detection of potential fluid build-up between the bearing and seal
• SUBCAB^® motor cable specially developed for submersible use

Installation Configurations

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. ​​