USK Submersible Water Pump 0.75HP 3SDM220

Understanding the Model (3SDM220):

• 3SDM: This is the key identifier for the pump’s diameter and type:
  • 3: Indicates the pump’s diameter. It’s designed to fit into a 3-inch (approximately 75mm) borehole casing (or slightly larger). This is crucial for boreholes where a more common 4-inch pump won’t fit.
  • SDM: Stands for Submersible Deep well Multistage pump. This means it has multiple impellers stacked to generate high pressure and effectively lift water from considerable depths. The “SDM” often implies stainless steel construction for the motor and pump casing, which is important for durability in submerged conditions.
• 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.
• 20: This is a very significant number, as it refers to the number of impellers (stages) in the pump. Having 20 impellers for a 0.75HP motor is a high number, enabling this pump to achieve an exceptionally high head (pressure) for its horsepower, making it suitable for very deep boreholes.

USK Submersible Water Pump 0.75HP 3SDM220 Key Features and Performance:

• Submersible Design: The entire pump and its motor are engineered to operate fully immersed in the water within the borehole. This design provides:
  • Silent Operation: The water dampens motor noise.
  • Self-Priming: No need for manual priming, as the pump is always surrounded by water.
  • High Efficiency: Pushes water upwards, which is more efficient for deep water extraction than pulling.
• 0.75HP (Horsepower): This is the motor’s power output, equivalent to approximately 0.55 kW. For a 3-inch pump with 20 impellers, this horsepower is effectively used to maximize the lifting capability rather than the volume of water, making it ideal for deep, narrow wells.
• 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 standout feature of the 3SDM220. With 20 impellers, its maximum head is typically in the range of 120 to 130 meters. This makes it one of the most powerful 3-inch pumps in terms of lift, capable of bringing water from very significant depths.
• 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:
  • Body: Usually high-grade stainless steel (e.g., AISI 304) for excellent corrosion resistance in submerged conditions.
  • Impellers/Diffusers: Commonly made 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, either oil-filled or water-filled for efficient cooling and lubrication.