USK Submersible Water Pump 0.75HP 3SDM220

The “USK Submersible Water Pump 0.75HP 3SDM220” is a very specific and popular model of deep well submersible pump, particularly well-suited for narrower boreholes. The model code itself provides crucial details about its design and performance.

Understanding the Model Code “3SDM220”:

• 3: Refers to the diameter of the pump in inches. This means the pump is designed to fit into a 3-inch (or larger) borehole casing. This is ideal for narrower wells where a 4-inch pump might not fit.
• SDM: This often stands for “Stainless Steel Deep Well Motor,” implying that both the motor casing and the pump’s hydraulic components (casing) are constructed from durable and corrosion-resistant stainless steel. It also signifies that it’s a multi-stage centrifugal pump, which uses a series of impellers to build high pressure (head) over long vertical distances.
• 2: This number typically represents the approximate flow rate in cubic meters per hour (m³/h) at a specific head, or it might refer to the series number for flow characteristics. In this case, it suggests a nominal flow rate in the 2 m³/h range.
• 20: This is a crucial number for submersible pumps and refers to the number of impellers (stages) in the pump. A higher number of impellers allows the pump to generate significantly more pressure (head) from the same motor size. 20 impellers for a 0.75HP pump is a very high number, enabling it to achieve a substantial head.

Key Features and Specifications (USK 0.75HP 3SDM220 Submersible Water Pump):

• Pump Type: Submersible Borehole Pump. Fully immersed in the water source.
• Horsepower (HP): 0.75 HP.
  • Wattage: Approximately 550 Watts (0.55 kW). This is a robust power rating for residential and small-scale applications.
• Performance:
  • Maximum Head (Vertical Lift): Due to its 20 impellers, this pump is designed for a very high maximum head. Listings for this specific model indicate a maximum head of 120 meters (or sometimes 125 meters). This means it can push water from very deep boreholes.
  • Flow Rate: Flow rates will vary with head, but typically range from 10 to 40 liters per minute (L/min) (or roughly 0.6 to 2.4 m³/h), with flow decreasing as the head increases.
• Construction:
  • Stainless Steel Body: The pump’s external casing, shaft, and potentially internal components are made of stainless steel (often AISI 304) for excellent corrosion resistance and durability in submerged conditions.
  • Impellers: Multi-stage, often made of durable engineering plastic (e.g., Noryl/PPO) or stainless steel, designed to handle some sand content.
  • Motor Windings: Typically 100% copper coil windings for efficiency and longevity.
• Voltage: Single-phase 220V-240V AC (50Hz), suitable for standard household power in Kenya.
• Control Box: Includes an external control box for starting, motor protection, and capacitor.
• Cable: Comes with a pre-attached electrical cable, the length of which determines the maximum submersion depth (e.g., 50m, 80m, or 100m cable).
• Outlet Size: Common 1-inch outlet.
• Protection Class: IP68 (dust and water protection) for safe continuous immersion.

Common Applications:

• Very Deep Well and Borehole Water Supply: Ideal for properties with unusually deep water tables where lower head pumps would not suffice.
• High-Rise Building Supply: Can effectively pump water to high overhead tanks in multi-story residential or commercial buildings.
• Remote Water Sources: Suitable for transferring water over long vertical distances.
• Small-Scale Irrigation from Deep Sources: For specific agricultural needs where high pressure is required over a significant lift.