MNE series 50Hz

Summary

Product identification

The MNE series consists of close-coupled electric pumps, also referred to as monobloc electric pumps, designed in accordance with EN 733 (DIN 24255) standards. These are surface electric pumps.

Key performance ranges for the series include:

• Capacity: up to 390 m³/h
• Head: up to 105 m
• Power: up to 90 kW

An example model identification, MN25E50-250-2P-50-TM-SS, breaks down as:

• M: Monobloc electric pump
• N: Standardized pump (EN 733)
• 25: Nominal power in CV (HP), ranging from 1.5 to 125 CV
• E: High efficiency series
• 50: Nominal outlet diameter, ranging from 32 to 125
• 250: Nominal impeller diameter, ranging from 160 to 315
• 2P: Number of poles (2P or 4P)
• 50: Frequency in Hz
• TM: Seal type (TM = Mechanical seal, TB = Packed gland)
• SS: Impeller type (SS = AISI 304 stainless steel, GG = Carbon steel + Cataphoresis)

Operating limits

• Max. solids contents: 40 g/m³
• Max. water temperature: 90 °C
• Max. running time with Q=0: 2 min
• Max. operating pressure: 10 / 16 bar (including suction pressure)
• Max. suction pressure: Varies by pump model and operating speed (2900 min⁻¹ or 1450 min⁻¹). See the official PDF for exact tabulated values.

Feed water

Pump performances are referenced to cold water (20°C) at atmospheric pressure (1 bar), guaranteed according to ISO 9906 Grade 3B norms.

• Liquid density: 1000 kg/m³
• Kinematic viscosity: Not higher than 1 mm²/s

Electrical

• Motor type: Three-phase closed asynchronous electric motors
• Protection class: IP 55
• Insulation class: F
• Frequency: 50 Hz
• Poles: Available in 2-pole (2900 min⁻¹) and 4-pole (1450 min⁻¹) configurations.

Mechanical / hydraulic

• Construction: Close-coupled electric pumps coupled to IEC standard electric motors by rigid coupling. Pump body in compliance with EN 733 - DIN 24255 standards.
• Main materials:
  • Pump body: Cast iron
  • Impeller: AISI 304 stainless steel (SS) or Carbon steel + Cataphoresis (GG)
  • Wear ring: Cast iron
  • Support: Cast iron
  • Coupling: Cast iron
  • Shaft: Stainless steel
  • Cover: Cast iron
  • Spacer: Stainless steel
  • Twinner System®: Stainless steel
  • Stuffing box packing: Synthetic fibers
  • Shaft protection bushing: Chromed stainless steel
• Seal types:
  • Mechanical seal (TM): According to DIN 24960.
    • Standard -TM: Sliding faces of carbo-graphite resin impregnated and alumina oxide; secondary seals of Nitrile rubber (NBR); spring of AISI 304 stainless steel.
    • Option TG: Sliding faces of tungsten carbide and alumina oxide; secondary seals of Nitrile rubber (NBR); spring of AISI 304 stainless steel.
    • Option TW: Sliding faces of silicon carbide and tungsten carbide; secondary seals of fluoroelastomer; spring of AISI 316 stainless steel.
    • Option TV: Sliding faces of tungsten carbide and tungsten carbide; secondary seals of fluoroelastomer; spring of AISI 316 stainless steel.
  • Packed gland (TB): Features the Twinner System®, which includes a two-half stainless steel flange for easy replacement of synthetic fiber stuffing box packing on a chromium-coated stainless steel bush. Stainless steel screws facilitate control and replacement.
• Forces and torques on flanges: Detailed tables for Fy, Fz, Fx, ΣF, My, Mz, Mx, ΣM values for various nominal outlet and inlet diameters are available. See the official PDF for exact tabulated values.

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

Official datasheet (PDF)

Lenntech datasheet mirror