MPSU

Summary

Product identification

The MPSU series consists of vertical multi-stage close-coupled pumps, designed for submersible or surface installation. These are 5-inch pumps.

Key construction features:

• External jacket in stainless steel AISI 304.
• Stages made of Noryl.
• MPSUM models include a built-in capacitor, accessible via the delivery casing.
• Suction connection is on the lower casing, and delivery connection is on the top casing.
• Motor cooling is achieved by the pumped water flowing between the motor jacket and the external jacket.
• Features a double mechanical shaft seal with an interposed oil chamber.

Applications

These pumps are suitable for:

• Clean water without abrasives or additives aggressive to pump materials.
• Domestic, civil, and industrial applications.
• Installation in confined spaces with minimum ventilation.
• Locations subject to temporary flooding, allowing full immersion.
• Areas exposed to water jetting.
• Situations requiring low-noise operation.

Operating limits

• Water temperature: Up to 35 °C
• Maximum permissible pressure in pump casing: 8 bar
• Duty: Continuous

Feed water

Suitable for clean water without abrasives or additives aggressive to the pump materials.

Electrical

• Motor type: 2-pole induction motor, 50 Hz (n ≈ 2900 1/min)
• MPSU (three-phase) voltages:
  • 230 V ± 10%
  • 400 V ± 10%
• MPSUM (single-phase) voltage:
  • 230 V ± 10%, with thermal protector and incorporated capacitor.
• Cable type: H07RN8-F, length 5 m.
  • MPSU: Without plug.
  • MPSUM (with float switch, on demand): With plug CEI-UNEL 47166.
• Insulation class: F
• Protection: IP X8 (for continuous immersion)
• Winding: Triple impregnation humidity-proof dry winding
• Compliance: Constructed in accordance with EN 60034-1; EN 60335-1, EN 60335-2-41.
• Capacitor values (for MPSUM models):
  • MPSUM 304, MPSUM 305: 20 μF
  • MPSUM 306, MPSUM 307: 25 μF
  • MPSUM 504, MPSUM 505: 25 μF
  • MPSUM 506: 30 μF
  • MPSUM 507: 35 μF
• Special features on request:
  • Other voltages
  • Frequency 60 Hz (as per 60 Hz data sheet)
  • Cable length 15 m
  • Motor suitable for operation with frequency converter

Mechanical / hydraulic

• Construction: Vertical multi-stage close-coupled submersible or surface pumps.
• Connections: G1 1/4 ISO 228 (delivery and suction).
• Materials:
  • Delivery casing, External jacket, Base, Motor jacket, Shaft: Chrome-nickel steel 1.4301 EN 10088 (AISI 304)
  • Stage casing, Impeller: PPO-GF20 (Noryl)
  • Capacitor cover, Oil chamber cover: PPS Polymer (Grivory)
  • Upper mechanical seal: Steatite, carbon, NBR
  • Lower mechanical seal: Carbon, silicon carbide, NBR
  • Seal lubrication oil: Oil for food machinery and pharmaceutic use
• Dimensions and Weights: See the official PDF for exact tabulated values for specific models (MPSU 304-307, MPSU 504-507, and corresponding MPSUM models).
  • Overall heights range from 553 mm to 720 mm.
  • Weights range from 11.4 kg to 17 kg for MPSU models, and 12.4 kg to 18.5 kg for MPSUM models (with 5 m cable).
  • Cable cross-sections vary by model and voltage, including 3G1 mm², 3G1.5 mm², 3G2.5 mm² for single-phase 230V, and 4G1 mm² for three-phase 230V and 400V.
• Performance Data: Coverage charts, performance tables, and characteristic curves (H-Q, NPSH, efficiency) are available in the official PDF for n ≈ 2900 rpm.

Key Features

• Greater Safety: Double shaft sealing with an oil chamber separates the motor from the water, providing protection against accidental dry operation.
• Low-Noise Operation: Achieved through hydraulic design, a water-filled shroud around the motor, and submerged operation.
• Reliable: Ball bearings and shaft are sized to reduce stresses, ensuring high reliability.
• Flexible: Allows capacitor inspection without disassembling the pump, through the delivery casing.
• Innovative: Designed to withstand water hammering and frequent ON-OFF operation of discharge line valves. Impacts are supported by the capacitor cover, relieving stress on the stainless steel jacket and protecting plastic hydraulic parts.

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

Official datasheet (PDF)

Lenntech datasheet mirror