USK Submersible Water Pump 1HP 3SDM227

Understanding the Model (3SDM227):

• 3SDM: This part is critical for defining the pump’s suitability:
  • 3: Indicates the pump’s diameter. It’s designed to fit into a 3-inch (approximately 75mm) borehole casing (or slightly larger). This is a crucial feature for boreholes where a more common 4-inch pump simply won’t fit.
  • SDM: Stands for Submersible Deep well Multistage pump. It features multiple impellers stacked in series, which is how it generates the high pressure needed to lift water from significant depths. The “SDM” series typically implies stainless steel construction for durability.
• 2: This number typically represents the nominal flow rate in cubic meters per hour (m3/h) at a specific head, or it might refer to a flow series. So, a nominal flow rate around 2 m3/h (2000 liters per hour or approximately 33 liters per minute) is expected.
• 27: This is a very significant number, indicating the number of impellers (stages) in the pump. With 27 impellers, this 1HP pump is engineered to achieve an exceptionally high maximum head (pressure), making it ideal for the deepest boreholes.

USK Submersible Water Pump 1HP 3SDM227 Key Features and Performance:

• Submersible Design: The entire pump and its motor are designed to operate completely submerged in the water within the borehole. This offers:
  • Quiet Operation: Water dampens motor noise effectively.
  • Self-Priming: The pump is always in water, so no manual priming is required.
  • High Efficiency: Pushes water upward, which is more efficient for deep lifts than suction.
• 1HP (Horsepower): This is the motor’s power output, equivalent to 0.75 kW. For a 3-inch pump, 1HP combined with 27 impellers means it’s heavily optimized for maximum lift rather than high flow volume.
• Voltage: Operates on standard single-phase 220V/230V AC (50Hz), compatible with typical household electrical systems in Kenya.
• Maximum Head (Vertical Lift): This is the most impressive aspect of the 3SDM227. With 27 impellers, its maximum head is typically in the range of 150 to 180 meters. This makes it suitable for extracting water from exceptionally deep boreholes.
• Rated Flow Rate: As indicated by the “2” in the model, the optimal flow rate is around 2 m3/h (2000 liters per hour or 33 liters per minute). The actual flow rate will decrease as the operating depth (head) increases.
• Durable Construction:
  • External Casing: Typically made of high-grade stainless steel (e.g., AISI 304) for excellent corrosion resistance in submerged environments.
  • Impellers/Diffusers: Commonly manufactured from durable, high-strength engineering plastics (like POM or Noryl) or stainless steel, designed for wear resistance even with very low sand content.
  • Motor: Hermetically sealed, usually oil-filled or water-filled for efficient cooling and lubrication.
  • Built-in Check Valve: Often integrated to prevent water backflow in the riser pipe.
  • Control Box: Comes with a separate control box containing the start capacitor and crucial thermal overload protection.
• Minimum Well Diameter: Requires a minimum borehole diameter of 3 inches (75mm) to fit.
• Submersible Cable: Typically supplied with a standard length of waterproof submersible cable (e.g., 30-50 meters), but can be extended by a qualified professional.
• Sand Content: Designed for clean water or water with very low sand content (usually max 0.25% by weight).