Water supply is a basic human right even though in a country such as India there are many areas that still do not have the a reliable water supply. Other regions are still using archaic methods such as the a well system with a bucket on a rope. However the water supply industry has however advanced considerably in technology to create many different water supply product such as deep well pumps.

What are deep well pumps?

To understand what deep well pumps are it is imperative to look at what a submersible pump is and how the pump operates. A submersible pump is a pump that is designed and manufactured specifically for being submerged within a tank, well or other container that contains fluid. A system of mechanical seals are used in a submersible pump to prevent water from entering the motor and causing a short circuit. When using submersible borehole pumps the pump provides significant lifting forces without having to rely on external air pressure to lift the fluid.

Now that a submersible pump has been defined a definition can know be given for deep well pumps. The definition for deep well pumps can be defined as specialized submersible borehole pumps that are used to force water upward from a pumping element below the water level. These pumps are not restricted by suction lift limitations.

Borehole submersible pumps for wells from 3 to 10- inch wells, with 2-pole electric motors. The most complete range of submersible borehole electric pumps to meet all your borehole pumping applications suitable to replace standard surface pumps, carrying the advantages of lesser space needed, less maintenance and complete absence of noise. In all domestic, industrial and agricultural applications, where it is required to life water out from below the ground and to push it above with pressure.

Bladder Pumps consist of a flexible, squeezable bladder encased in a rigid outer casing. They are low-flow pneumatic devices used for sampling applications. Bladder pumps are available in a range of sizes, materials, and capabilities. This includes including models for deep wells, narrow or obstructed casings, and small-volume pumps for low-yield wells. When low-flow pumping rates are used, these pumps consistently collect high quality, uniform samples. Bladder pumps are EPA-accepted for low-flow sampling. To function, bladder pumps are lowered into a wells water column. Water is drawn into the bladder via hydrostatic pressure and is passed through a check valve at the bottom of the pump. When the bladder fills up, the check valve closes so that there is no backflow.

The water is then pumped up to the surface via injected gas pressure that squeezes the bladder. A pneumatic control box on the surface usually regulates the gas pressure. The bladder pumps lift capabilities are directly related to the pressure rating of the bladder, the size of the tubing, the power rating of the pressure source (e.g., air compressor or compressed gas), and controller box ability to apply sufficient force of gas at depth. Once the bladder is empty, the gas pressure relaxed and the check valve opens again, restarting the process. This sampling process is not very intrusive within the well system, and is thereby capable of collecting very low turbidity samples (< 5 NTUs).

Bladder pumps are designed to minimize the potential for sample contamination. Bladders are generally constructed of relatively inert materials, and are nonporous. The bladders design ensures that the injected gas does not come into contact with the sample. It also keeps the sample from contacting any of the pumps moving parts; thereby alleviating the danger of contamination from lubricants and fluids, such as oil or grease. Additionally, the downwell equipment is often permanently dedicated to a given well, so both samples and the well are protected from disturbance and the danger of cross-well contamination. Bladder pumps consist of a flexible, squeezable bladder encased in a rigid outer casing. They are low-flow pneumatic devices used for sampling applications. Bladder pumps are available in a range of sizes, materials, and capabilities. They include including models for deep wells, narrow or obstructed casings, small-volume pumps, and pumps for low-yield wells. Sampling pumps, groundwater sampling pumps, low volume pumps, and submersible pumps are also available. When low-flow pumping rates are used, a mechanical bladder pump consistently collects high quality, uniform samples.

A bladder pump may be EPA-accepted for low-flow sampling.To function, bladder pumps are lowered into a wells water column. Water is drawn into the bladder via hydrostatic pressure and is passed through a check valve at the bottom of the pump. When the bladder is full, the check valve closes to prevent backflow. The water is then pumped up to the surface via injected gas pressure that squeezes the bladder. A pneumatic control box on the surface regulates the gas pressure. The lift capabilities of a bladder pump are directly related to the pressure rating of the bladder, the size of the tubing, the power rating of the pressure source (e.g., air compressor or compressed gas), and controller box ability to apply sufficient force of gas at depth. Once the bladder is empty, the gas pressure is relaxed and the check valve opens again, restarting the process. This sampling pump is not very intrusive within the well system, and is thereby capable of collecting very low turbidity samples (< 5 NTUs).

Bladder pumps are designed to minimize the potential for sample contamination. Many low volume pump, submersible pump, and groundwater sampling pump models are available. Bladders are generally constructed of relatively inert materials, and are nonporous. The bladder design ensures that the injected gas does not come into contact with the sample. It also keeps the sample from contacting any of the pumps moving parts. This alleviates the danger of contamination from lubricants and fluids such as oil or grease. Additionally, the downwell equipment is often permanently dedicated to a given well, so both samples and the well are protected from disturbance and the danger of cross-well contamination.The use of bladder pumps may involve a substantial upfront investment, but by dedicating a pump to a single well, this investment can quickly be recouped. Additionally, bladder pumps are easily repaired in the field, and have few moving parts that may wear out. Although the bladder system will not be damaged if forced to run in a dry well, the bladder is susceptible to rapid pressure changes and freezing.

Axial Flow Pumps or Propeller Pumps allow fluid to enter the impeller axially. They discharge fluid nearly axially, pumping the liquid in a direction that is parallel to the pump shaft. An axial flow pump is also called a propeller pump because the impeller works much like the propeller of a boat. The propeller is driven by a motor that is either sealed directly in the pump body or by a drive shaft that enters the pump tube from the side.Axial flow pumps use the propelling action of the impeller’s vanes on the liquid to develop pressure. Axial flow pumps can be adjusted by changing the pitch of the blades on the propeller. This makes them useful for either high-flow/low-pressure applications or low-flow/high-pressure applications. Axial flow pumps are frequently used in industrial settings as circulation pumps that work in conjunction with sewage digesters or evaporators. Axial flow pumps are also used in heat recovery systems, nuclear reactor water circulation, and high volume mixing applications. Axial flow pumps can also be used as a liquid pump for ballast control in marine applications.Axial flow pumps use the propeller action to draw water into the pump by suction. An axial flow pump can be designed as a suction pump that draws water in through one end and discharges it out the top of the pump. However, axial flow pumps are not typically used for suction lift applications. Axial flow pumps used for pumping clear water or storm water may also be submersible. A submersible pump that uses an axial flow design is common in irrigation and drainage applications. Axial flow pumps may also be used as a sump pump in some industrial applications to circulate slurries or wastewater or to drain storm water from sump pits or waste storage lagoons. Axial flow pumps are typically used in high flow rate, low lift applications. A mixed flow pump similar to a turbine pump may be used as a well pump provided the well is not too deep.

Centrifugal: "Moving or directed away from the center (or axis)"

Centrifugal pumps are the most common type of pump used in plumbing systems. This article explores the basic design concepts and functional principals of these pumps.

One of the claimed advantages of the centrifugal pumps over positive displacement pumps is their ability to operate over a wide range of flow. Since a centrifugal pump operates at the intersection of a pump curve and a system curve, by varying the system curve the operating point of the pump is easily changed: