How Much HP Submersible Pump is Required for a 700 Feet Borewell with a 1 Inch Pipeline?

When selecting a submersible pump for a borewell, the total dynamic head (TDH) and the required flow rate are key factors to consider. This article will guide you through the necessary calculations to determine the appropriate horsepower (HP) for your specific needs.

Factors to Consider

The selection of a submersible pump involves several factors, such as the depth of the borewell, the length and diameter of the pipeline, and the estimated flow rate. Let's break down the process with an in-depth look at each component.

Calculate Total Dynamic Head (TDH)

TDH is the total height the pump needs to lift the water. This includes the depth of the borewell and the friction loss in the pipeline.

1. Depth of the Borewell

Depth: 700 feet

2. Friction Loss Calculation

Friction loss occurs due to the resistance the water faces as it moves through the pipeline. This can be estimated using standard tables or formulas. For a 1-inch diameter pipe, a common household flow rate is considered.

Estimate of Flow Rate

Flow Rate: 5 gallons per minute (GPM)

Friction Loss Estimate

Using a friction loss chart, the approximate head loss for a 1-inch pipe at 5 GPM over 700 feet is estimated to be around 20-30 feet. For a rough estimate, let's assume a head loss of 25 feet.

Total Dynamic Head (TDH) Calculation

Assuming a friction loss of 25 feet, the total dynamic head can be calculated as:

TDH Depth of Borewell - Friction Loss

TDH 700 feet - 25 feet 725 feet

Calculate Horsepower (HP)

The formula to calculate horsepower is:

HP (Flow Rate GPM x TDH ft) / (3960 x Pump Efficiency)

Assuming a pump efficiency of around 70% (0.7), using a flow rate of 5 GPM, the calculation is:

HP (5 x 725) / (3960 x 0.7) ≈ 3625 / 2772 ≈ 1.31 HP

Recommended Pump Size

Submersible pumps are typically available in standard sizes. A 2 HP submersible pump would be a suitable choice to ensure sufficient capacity and account for variations in flow rate or efficiency.

Conclusion

For a 700-foot borewell with a 1-inch pipeline and an estimated flow rate of 5 GPM, a 2 HP submersible pump would be appropriate. However, it's always recommended to consult with a professional to assess specific site conditions and requirements.

Additional Considerations:

Water Well Depth: It is uncommon to find a water well that deep, as most are not. Typically, water well depths range from 10 to 200 feet. Power Source: A 24V DC submersible pump is more energy-efficient for low-power needs. However, deep borewells require more powerful pumps. Solar Power: A 24V DC submersible pump can be powered by a smaller solar panel setup, such as a 200W panel, which is more efficient for remote locations than AC-powered pumps.

Note: The information provided is based on a typical scenario. Always consult with an expert before making purchasing decisions to ensure the pump meets your specific needs.