ENR

Summary

Product identification

• Product Line: CENTRIFUGAL PUMPS ENR
• Frequency: 50Hz
• Number of Poles: 2

Operating limits

• Type of liquid handled: Clean water
• Liquid Temperature:
  • min. -20°C
  • max +120°C
• Maximum working pressure: 1.47 MPa

Electrical

• Motor Type: Electric - TEFC, Three Phase
• Efficiency level (Reg. 640/2009): IE2
• Rotation speed: ≈2900 min⁻¹
• Insulation Class: F
• Protection degree (CEI EN 60034-5): IP 55
• Power rating: 0.75 ÷ 110 kW (1 ÷ 150 HP)
• Frequency: 50 Hz
• Voltage: 400/690 ±10% V
• Over load protection: Provided by the user
• Casing material: Cast Iron

Mechanical / hydraulic

• Flange: UNI 2236
• Counterflange (On request): UNI 2247
• Impeller: Closed centrifugal type
• Shaft seal type: Mechanical seal
• Construction:
  • Bearing: Sealed ball bearing
  • Suction Pipe Connection: Flange to DIN 2532
  • Discharge Pipe Connection: Flange to DIN 2532
• Material:
  • Casing: CAST IRON
  • Impeller: CAST IRON / BRONZE
  • Shaft seal: SiC/Carbon/EPDM
  • Shaft: AISI 420
  • Bracket: CAST IRON
• Applicable standard of test: ISO 9906 – Annex A

Performance Curve Specifications

• Tolerances according to ISO 9906 Annex A.
• Curves refer to effective speed of asynchronous motors at 50 Hz.
• Measurements carried out with clean water at 20°C and with a kinematic viscosity of ν = 1 mm²/s (1 cSt).
• The NPSH curve is an average curve obtained in the same conditions of performance curves.
• Continuous curves indicate the recommended working range; dotted curves are a guide.
• Pumps should not be used at a flow rate below 10% of best efficiency point to avoid overheating.
• Symbols explanation:
  • Q = volume flow rate
  • H = total head
  • P2 = pump power input (shaft power)
  • η = pump efficiency
  • NPSH = net positive suction head required by the pump
  • MEI = minimum efficiency index
• The minimum efficiency index (MEI) is a measure of pump quality based on hydraulic efficiency and head at the best efficiency point, based on the full impeller diameter.
• Operation with variable duty points may be more efficient and economic when controlled by a variable speed drive.

Dimensions and Weight

Dimension tables are provided for various ENR pump models (e.g., ENR 32-125, ENR 40-160, ENR 50-200, ENR 65-125, ENR 80-160, ENR 100-160, ENR 125-200) paired with motors of different kW ratings. These tables include dimensions (DN1, DN2, a, h1, h2, A, B, F, Y, V, E, H, S, T in mm) and weights (in kgf).

See the official PDF for exact tabulated values.

Mechanical Components (Sectional View)

Key components identified in the sectional view include:

• Volute casing (10.20)
• Casing cover (16.10)
• Support foot (18.30)
• Shaft (21.00)
• Impeller (23.00)
• Ball bearing (32.10)
• Bearing bracket (33.00)
• Mechanical seal (43.30)
• Stuffing box (46.10)
• Shaft sleeve (stuffing box) (52.40)

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Disclaimer: This summary is based on extracted text and may miss figures, footnotes, or revisions present in the complete OEM PDF. Contractual data must always match the official OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror