Pedrollo 4SR

Summary

Product Identification

The Pedrollo 4SR and 4SR-S are 4" submersible pumps designed for civil, domestic, and agricultural applications, specifically for pumping clean water.

Key features include low energy consumption and durability, even in the presence of sand, thanks to an innovative patented hydraulics system. The 4SR-S series features floating impellers and a patented inductor for improved priming in wells with air/water mix or gassy water.

• Registered Trademarks: 4SR-S®, SABBIA®
• Patents: European Patent No. EP3123031, European Patent No. EP2419642 (for 4SR-S), Patent No. 10202100003057 (for 4SR-S)

Operating Limits

• Liquid temperature: Up to +35 °C
• Maximum sand content:
  • 200 g/m³ for 4SR-S
  • 150 g/m³ for 4SR-N
• Maximum operating depth below water level:
  • 200 m with 4PD motors
  • 300 m with 4PS motors
• Operation:
  • In vertical position
  • Horizontally with the following limits:
    • 4SR-S - 1 / 1.5 / 2 / 4 up to 23 stages
    • 4SR-S 6 / 8 up to 17 stages
    • 4SR-N 10 / 12 / 15 up to 13 stages
• Starts per hour: 20 at regular intervals
• Minimum motor cooling flow: 8 cm/s
• Duty: Continuous running duty S1

Performance Range

• Flow rate: Up to 350 l/min (21 m³/h)
• Head: Up to 576 m
• Performance curves comply with EN ISO 9906 Grade 3B tolerance limits.
• MEI≥ 0.40

Electrical

• Standard Voltage/Frequency:
  • Three-phase 400 V - 50 Hz
  • Single-phase 230 V - 50 Hz
• Capacitor: Included in packaging (for single-phase models)
• Power cable length:
  • 2 m for power ratings from 0.75 to 2.2 kW
  • 3.6 m for power ratings from 3 to 7.5 kW
• Motor Types:
  • 4PD = rewindable oil filled motor
  • 4PS = encapsulated water filled motor
• Available upon request: Different voltage requirements, 60 Hz frequency.

Mechanical / Hydraulic

• Pump Diameter: 4"
• Materials and Components:
  • Delivery port: Micro-cast AISI 304 stainless steel with thread according to ISO 228/1
  • Check valve: Stainless steel AISI 304
  • Motor bracket: Stainless steel AISI 304, sized to NEMA standards
  • Impeller: Delrin® for 4SR-S, Noryl™ for 4SR-N
  • Diffuser: Noryl™
  • Stadium box: Stainless steel AISI 304
  • Pump shaft: Stainless steel AISI 304
  • Pump bearings: Made of AISI 316L stainless steel coated with chromium oxide to resist sand
  • Tow coupling: Stainless steel
  • Filter: Stainless steel AISI 304
  • Cable sheath: Stainless steel AISI 304
• Installation:
  • Suitable for wells with a minimum diameter of 4" (100 mm).
  • Must be lowered to ensure it remains fully submerged, maintaining at least 50 cm or one metre from the bottom of the well.
  • Advisable to secure the pump with a stainless-steel cable connected to attachments on the delivery port.
  • For installation in reservoirs, rivers, or lakes, an external cooling jacket (flow generator) is required to prevent motor overheating. A cooling jacket kit is available upon request, recommended for power ratings from 3 kW to 7.5 kW.

Dimensions and Weights

Extensive tables are provided for single-phase and three-phase models, covering various power ratings and both 4PD (oil-filled) and 4PS (water-filled) motor types. These tables include overall dimensions (h1, h2, h3 in mm) and weights (kg).

See the official PDF for exact tabulated values.

Performance Data

Detailed tables list power (P2 in kW and HP), flow rate (Q in m³/h and l/min), and total manometric head (H in metres) for a wide range of 4SR-S and 4SR-N models at 50 Hz.

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 complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror