NM, NMD

Summary

Product identification

Calpeda NM and NMD series are close-coupled centrifugal pumps with threaded ports, designed for fluid transfer applications.

• NM: Single-impeller models.
• NMD: Models with two back-to-back impellers for axial thrust balancing.
• Connections: Threaded ports ISO 228/1 (BS 2779).
• Construction Versions:
  • NM, NMD: Pump casing and lantern bracket in cast iron.
  • B-NM, B-NMD: Pump casing and lantern bracket in bronze.
  • Pumps are supplied fully painted.

Applications

These pumps are suitable for clean, non-abrasive, and non-aggressive liquids (solids content up to 0.2%). Typical applications include:

• Water supply
• Heating, air-conditioning, cooling, and circulation plants
• Civil and industrial applications
• Fire fighting applications
• Irrigation

Operating limits

• Liquid temperature: From -10 °C to +90 °C
• Ambient temperature: Up to 40 °C
• Total suction lift: Up to 7 m
• Maximum permissible working pressure:
  • Up to 10 bar (standard models)
  • Up to 16 bar for NMD 25/190, NMD 32/210, and NMD 40/180
• Duty: Continuous duty

Electrical

• Motor type: 2-pole induction motor, 50 Hz (n ≈ 2900 rpm).
• Three-phase motors (NM, NMD):
  • 230/400 V ± 10% (up to 3 kW)
  • 400/690 V ± 10% (from 4 to 9,2 kW)
• Single-phase motors (NMM, NMDM):
  • 230 V ± 10%, with thermal protector.
• Insulation class: F
• Protection: IP 54
• Frequency converter: Motors from 1,1 kW are suitable for operation with a frequency converter.
• Classification: IE3 for three-phase motors from 0,75 kW.
• Compliance:
  • Constructed in accordance with EN 60034-1; EN 60034-30-1, EN 60335-1, EN 60335-2-41.
  • NM, B-NM series comply with European Regulation no. 547/2012.
• Special features on request: Other voltages, 60 Hz frequency, IP 55 protection, special mechanical seal, higher or lower liquid/ambient temperatures, motor suitable for frequency converter up to 0,75 kW.

Mechanical / hydraulic

• Construction: Close-coupled, centrifugal design with an electric motor featuring an extended shaft directly connected to the pump.
• Materials:
  • Pump casing: Cast iron (NM, NMD), Bronze (B-NM, B-NMD)
  • Lantern bracket: GJL 200 EN 1561 (NM, NMD), G-Cu Sn 10 EN 1982 (B-NM, B-NMD)
  • Impeller: Brass P-Cu Zn 40 Pb 2 UNI 5705 (standard), Cast iron GJL 200 EN 1561 (NM 17), Bronze G-Cu Sn 10 EN 1982 (B-NM 17)
  • Shaft: Cr steel AISI 430 (NM 6, 1,1 - 1,5 - 2,2 kW models), Cr Ni steel AISI 303, Cr Ni Mo steel AISI 316
  • Mechanical seal: Carbon - Ceramic - NBR

Performance

The datasheet includes detailed performance tables listing rated motor power output (P2 in kW and HP), flow rate (Q in m³/h and l/min), and total head (H in m) for various NM and NMD models. It also provides rated currents (IN A, IA/IN) for single-phase and three-phase motors. Extensive characteristic curves and coverage charts are presented graphically.

See the official PDF for exact tabulated values and graphical performance data.

Dimensions and weights

Detailed tables provide dimensions (e.g., a, fM, h1, h2, H, m1, m2, n1, n2, n3, b, s, l1, l2, w, g1, DN1, DN2 in mm) and weights (kg) for each specific NM and NMD model.

See the official PDF for exact tabulated values.

Features

• Compact Design: Allows for easy installation in confined spaces.
• Robust: Hydraulic parts in contact with the pumped liquid are dimensioned for maximum resistance to mechanical stress.
• Unique Design (Lantern Bracket): Prevents contact with rotating parts, providing user protection while allowing mechanical seal inspection.
• Reliable: Bearing and shaft design ensures stress reduction and high reliability under all operating conditions.
• Flexible (NMD series): Option for cast iron or bronze hydraulic parts allows selection for different liquid types.

---

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

Official datasheet (PDF)

Lenntech datasheet mirror