Which of the following pumps is suitable for wells regardless of depth?

• A. Jet pump
• B. Monobloc pump
• C. Submersible pump
• D. Turbine pump

Answer: (C)

The ability to be placed inside the well and operate while fully submerged is what makes this pump the best choice for wells of any depth. A submersible pump is sealed and lowered down into the water, pushing water up through the discharge pipe from within the well itself. Because it works underwater, there’s no suction head limitation from the surface, so depth isn’t a factor as long as power and proper piping are available.

Jet pumps lift water by creating a vacuum and rely on atmospheric pressure, which limits how deep they can effectively lift water. Monobloc pumps are typically mounted above ground and rely on suction, so very deep wells are impractical. Turbine pumps can be used in deep wells as well, but the general, straightforward solution for any depth is a submersible pump that is designed to be submerged.