USK Submersible Water Pump 0.5HP 4SDM307

• 4SDM: This is a common nomenclature for submersible borehole pumps.
  • 4: Refers to the pump’s diameter – it’s designed to fit into a 4-inch borehole casing (the most common size for domestic and small-scale boreholes).
  • SDM: Indicates it’s a Submersible Deep well Multistage pump. Multistage means it has multiple impellers (like stages) stacked to generate high pressure and lift water from significant depths.
• 3: Refers to the nominal flow rate in m³/h (cubic meters per hour). So, 3 m³/h is equivalent to 3000 liters per hour, or 50 liters per minute.
• 07: Refers to the number of impellers (stages) in the pump. More impellers generally mean higher head (pressure) but potentially lower flow for a given motor size.

USK Submersible Water Pump 0.5HP 4SDM307 Key Features and Performance:

• Submersible: This is the key characteristic. The entire pump (motor and pump end) is designed to be fully immersed in the water within the borehole or well. This is advantageous because:
  • It’s quiet since it operates underwater.
  • It doesn’t need to be primed (unlike surface pumps).
  • It’s more efficient as it pushes water up rather than pulling it.
• 0.5HP (Horsepower): This is the motor’s power, equivalent to 0.37 KW. For a submersible pump, 0.5HP is an entry-level size, suitable for basic domestic water supply from boreholes of moderate depth.
• Voltage: Single-phase 220V/230V AC (50Hz), compatible with standard household electricity in Kenya.
• Maximum Head (Vertical Lift): For a 0.5HP 4SDM307, the maximum head is typically around 49 to 50 meters. This means it can lift water from depths of up to approximately 49-50 meters.
• Rated Flow Rate: As indicated by the “3” in “4SDM307,” the rated flow rate is around 3 m³/h (3000 liters per hour or 50 liters per minute) at an optimal head.
• Construction:
  • Body: Often stainless steel (AISI 304 grade) for corrosion resistance in water.
  • Impellers/Diffusers: Typically made of high-strength thermoplastic (like Noryl or Lexan) or stainless steel. Thermoplastic impellers are common in this range for good performance and durability against minor sand content.
  • Motor: Hermetically sealed, oil-filled or water-filled for cooling and lubrication.
  • Check Valve: Often built-in to prevent backflow of water.
  • Control Box: Submersible pumps often come with a separate control box that contains the start capacitor, thermal overload protection, and power connections.
• Minimum Well Diameter: As it’s a “4SDM,” it requires a minimum borehole diameter of 4 inches (or greater) to fit.
• Cable Length: Typically comes with a standard cable length (e.g., 30 meters), but extensions can be added.