Flygt N 3356

Featuring industry-leading self-cleaning N-technology hydraulics, the Flygt N 3356 pump series is designed for long life and sustained high efficiency in clean water, surface water and wastewater.  

The series is available with Hard-Iron, grey iron, or duplex stainless steel impellers; with premium-efficiency motors; in explosion-proof versions; and for submersible or dry installation (configurations P, T and Z). 

N-technology for clog-free operation

The Flygt N-impeller is a semi-open impeller with self-cleaning capability. Backswept leading edges on the impeller vanes ensure that no material sticks to the impeller. These leading edges and the vane tips also work together with a stationary relief groove in the insert ring to mechanically push the most difficult and stubborn solids out of the pump. The result is clog-free pumping that reduces call-out costs by approximately a third and reduces energy consumption by a quarter, compared to pumps with conventional impellers. 

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

For greater wear resistance in abrasive and corrosive environments, N-hydraulics are available in Hard-Iron. 

Efficient cooling for submersible or dry installation

Flygt N 3356 pumps are available with several cooling options, including internal closed-loop cooling, direct cooling by the pumped media, and for high-temperature environments, external cooling.

Flygt’s advanced closed-loop cooling system is suitable for dry, partially submerged and fully submerged applications and allows 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 uses freeze-proof glycol cooling liquid and is completely sealed off, it is insensitive to both cold (down to -45°C) and impurities in the pumped media. 

Robust construction for reliable pumping

Each component of Flygt N-technology pumps is designed for ultimate reliability and performance. A modular design allows for pump configuration to meet specific application needs.

• Non-clog N-impeller in Hard-Iron, hardened grey iron or duplex stainless steel
• 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)
• Double mechanical seal system for 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

Flexible installation configurations

Flygt N-technology pumps are suitable for either wet or dry pit pumping stations. Installation packages include key accessories and components to fit 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.​​

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.

Contact us for expert pump station design support

A well-designed pump station allows pumps to deliver their maximum 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. 

Whether you’re looking for standardized or custom pump station designs, we can help you find the best solution for your project’s needs.