NM4, NMS4

Summary

Product identification

The Calpeda NM4 and NMS4 series are Close Coupled Centrifugal Pumps, complying with European Regulation no. 547/2012. The NM4 EI models are available with integrated frequency converters for variable-speed operation.

Construction

• Pump Type: Close-coupled centrifugal pumps with an electric motor.
  • Extended shaft directly connected to the pump up to 15 kW.
  • New bracket construction for standard motors (Stub-shaft construction) from 18.5 to 75 kW with integrated thrust bearing.
• Casing: Axial suction and radial delivery on top.
• Dimensions: Main dimensions and performance according to EN 733 with additional sizes for completion.
• Versions:
  • NM(S)4: Pump casing and lantern bracket in cast iron.
  • B-NM(S)4: Pump casing and lantern bracket/casing cover in bronze (pumps supplied fully painted).

Materials

• Pump casing:
  • NM4, NMS4: Cast iron
  • B-NM4, B-NMS4: Bronze
• Lantern bracket NM4: GJL 200 EN 1561
• Lantern bracket NMS4:
  • Cast iron GJL 200 EN 1561
  • G-Cu Sn 10 EN 1982 (for B-NM4, B-NMS4)
• Impeller:
  • Cast iron GJL 200 EN 1561
  • Bronze G-Cu Sn 10 EN 1982
  • Brass P- Cu Zn 40 Pb 2 UNI 5705 (for NM4 25/125 - 25/160 - 25/200 - NM4 32/16 - 32/20 - 40/20)
• Shaft:
  • Cr-Ni steel AISI 303
  • AISI 430 (from 1.5 kW to 15 kW)
  • Cr Ni Mo steel AISI 316
• Mechanical seal: Carbon - Ceramic - NBR
• Counter-flanges: Steel Fe 430B UNI 7070

Applications

• For clean liquids without abrasives, which are non-aggressive for the pump materials (contents of solids up to 0.2%).
• For water supply.
• For heating, air conditioning, cooling and circulation plants.
• For civil and industrial applications.
• When low noise operating is required.
• For 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
  • 16 bar for NM4 40/16,20; NM4 50/16; NM4 65/16,20,25; NM(S)4 80/16,31,400
• Duty: Continuous duty

Electrical

Motor (Standard NM4, NMS4)

• Type: 4-pole induction motor, 50 Hz (n ≈ 1450 rpm)
• Voltage:
  • Three-phase 230/400 V ± 10% up to 3 kW
  • Three-phase 400/690 V ± 10% from 4 to 75 kW
• Insulation class: F
• Protection: IP 54 (IP 55 for NMS4)
• Frequency converter compatibility: Motor suitable for operation with frequency converter from 0.75 kW.
• Efficiency: Classification scheme IE3 for three-phase motors from 0.75 kW.
• Standards: Constructed in accordance with EN 60034-1; EN 60034-30-1.

NM4 EI Pumps with Frequency Converter

• Rated motor power output: from 0.25 kW to 15 kW
• Control range: from 870 to 1450 rpm (4-pole)
• Integrated features: Equipped with I-MAT installed on board for a compact and efficient variable-speed system.
• Factory programming: Pump is equipped with transducers and factory programmed.
• Protections:
  • Against dry running
  • Against operations with closed valve ports
  • Against system leakages
  • Against overcurrent in the motor
  • Against overvoltage and undervoltage of the power supply
  • Against current unbalances between phases
• Operating modes:
  • Constant pressure mode (with pressure transducer)
  • Proportional pressure mode (with pressure transducer)
  • Constant flow mode (with flow meter)
  • Fixed speed mode (with setting of the speed preferential rotation)
  • Constant temperature mode (with temperature transducer)

Rated Currents

See the official PDF for exact tabulated values of rated currents (IN A) and starting current ratios (IA/IN) for various power outputs (P2 kW/HP) and voltages (230 V Δ / 400 V Y and 400 V Δ / 690 V Y).

Mechanical / hydraulic

Connections

• NM4 25/...: Threaded ports ISO 228
• From NM4 32/.. to NMS4 150/..: Flanges according to PN 10, EN 1092-2

Counter-flanges (on request)

• From NM4 32/.. to NM4 50/..: Screwed flanges EN 1092-1, PN 16
• From NM4 32/.. to NMS4 150/..: Flanges for welding EN 1092-1, PN 10

Performance

Performance charts (Coverage chart n ≈ 1450 rpm) and detailed performance tables (P2 kW/HP, Q m³/h, l/min, H m) are available in the official PDF for NM4, NMS4, B-NM4, and B-NMS4 models. Tolerances are according to UNI EN ISO 9906:2012.

Dimensions and weights

Detailed dimensions (a, fM, h1, h2, H, m1, m2, n1, n2, n3, w1, b, s, s1, l1, l2, w, m4, m5, g1, g2, n5, h4, DN1, DN2 mm) and weights (kg) are provided in extensive tables and diagrams in the official PDF for standard NM4, NM4 EI, NMS4, B-NM4, and B-NMS4 models.

Special features on request

• Other voltages.
• Frequency 60 Hz (as per 60 Hz data sheet).
• Protection IP 55.
• Special mechanical seal.
• Higher or lower liquid or ambient temperatures.
• Motor suitable for operation with frequency converter up to 0.55 kW.

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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 datasheet. Contractual data must always match the specific OEM PDF revision used for your project.

Official datasheet (PDF)

Lenntech datasheet mirror