NS 3315.090

Summary

Product Identification

The Flygt N-pump Series consists of self-cleaning pumps designed for sustained high efficiency.

Models include:

• 3085
• 3102
• 3127
• 3153
• 3171
• 3202
• 3301
• 3315
• 3231
• 3306
• 3312
• 3356
• 3400
• 3531

Operating Limits

• Ratings: 2.2 hp to 870 hp
• Discharges: Up to 20” (500 mm)
• Flows: Up to 16,000 US GPM (1,000 l/s)
• Heads: Up to 400 ft (120 m)
• Solids Handling: Can handle dry solids up to 8%
• Motor Operating Temperature: NEMA Class B maximum operating temperature rise of 80°C (176°F)
• Stator Windings Rating: 180°C (355°F)
• Starts per Hour:
  • Up to 30 starts per hour (for low and medium capacity pumps)
  • Up to 15 starts per hour (for large capacity pumps)
• Bearing Service Life:
  • Minimum 50,000 hours (for low and medium capacity pumps)
  • Minimum 100,000 hours (for large capacity pumps)

Feed Water

Flygt N-pumps are suitable for applications including:

• Wastewater
• Stormwater
• Sludge
• Industrial effluent
• Raw water
• Cooling water
• Abrasive applications and waters that could cause erosion corrosion due to high oxygen content (when equipped with Hard-Iron™ components).
• Applications requiring cutting long fibers or solids (when equipped with a chopper ring).

Electrical

• Motor Type: Class H squirrel-cage induction motor.
• Efficiency: Premium efficiency motors (IE3) are available. Motors are capable of fully utilizing available power when operating on a variable frequency drive.
• Compliance: Tested and approved in accordance with national and international standards, including 60034-1, IEC60034-1, and CSA. Explosion-proof versions are available, approved by Factory Mutual, European Standard, and IEC.
• Sensors:
  • Thermal sensors embedded in stator windings prevent overheating.
  • Optional leakage sensors in the stator and oil housings (for low capacity models).
  • Leakage sensor in the inspection chamber (for medium capacity models).
  • Analog temperature sensor monitors the lower bearing (for large capacity models).
  • Leakage sensors in the stator housing/leakage chamber and junction box (for large capacity models).

Mechanical / Hydraulic

• Design: Patented N-technology with an innovative self-cleaning impeller, modular design.
• Installation: Submersible and dry installations.
• Discharge Sizes:
  • Low Capacity Pumps (Models 3085, 3102, 3127): 3" (80 mm), 4" (100 mm), 6" (150 mm)
  • Medium Capacity Pumps (Models 3153, 3171, 3202, 3301, 3315): Ranges from 3" (80 mm) to 10" (250 mm)
  • Large Capacity Pumps (Models 3231, 3306, 3312, 3356, 3400, 3531): Ranges from 8" (200 mm) to 20" (500 mm)
• Impeller Options:
  • Cast iron impeller with hardened edges and insert ring (for typical pumping applications).
  • Hard-Iron™ (60 HRC) for abrasive and erosion corrosion applications.
  • Chopper ring for cutting long fibers or solids.
• Seal Systems:
  • Spin-out™ Seal Protection: Expels abrasive particles from the seal chamber.
  • Long-life Seals: Durable tungsten carbide seals.
  • Griploc™ Seal (Models 3085 – 3127): Robust design with solid seal rings and patented griplock spring for axial fixation and torque transmission. Consists of two sets of mechanical shaft seals.
  • Adaptive N-impeller (Models 3085 – 3127): Can move axially to enable easy passage of large solids.
  • Flygt Plug-in™ Seal with Active Seal™ System (Models 3153 – 3315): A patented zero-leakage double-seal system that actively prevents liquid from entering the motor cavity. Features an inner seal with laser-cut grooves for a hydrodynamic pumping effect.
  • Active Seal™ System (Models 3231 – 3531): Patented zero-leakage double-seal system with an inner seal featuring laser-cut spiral grooves.
• Shaft: Short shaft overhang to minimize vibration and reduce shaft deflection.
• Cooling:
  • Cooled by the surrounding liquid (submersible installations).
  • Internal closed-loop cooling system (for more demanding applications).
  • Cooled by the pumped liquid (for large capacity pumps).
• Cable Entry: Water-resistant cable entry provides sealing and strain relief.
• Installation Methods:
  • P: Semi-permanent installation within a vertical steel or concrete column.
  • S: Semi-permanent wet well installations with twin guide bars on a discharge connection.
  • T: Vertically-mounted, permanent dry well or in-line installation with flange connections for suction and discharge pipework.
  • Z: Horizontally-mounted, permanent dry well or in-line installation with flange connections for suction and discharge pipework.
  • L: Semi-permanent freestanding installation (transportable version with pipe or hose connection).

Options

Optional equipment available to customize Flygt N-pumps:

• Motor: Premium efficiency (IE3)
• Hydraulic: Guidepin, Hard-Iron™, Chopper, Adaptive N
• Seal System: Griploc™ seal, Plug-in™ seal, Active Seal™, Spin-out™, Seal flush
• Cooling System: w/o cooling jacket, Closed Loop Cooling, Pump media, External
• Installation: P, S, T, Z, L
• Accessories: Flush valve
• Pump Monitor: Prepared for Mini CAS, MAS
• Pump Control: SmartRun™, MultiSmart™, FGC

See the official PDF for exact tabulated values regarding which options are standard or optional for specific models.

---

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror