Open Well Pumps Frequently Asked Questions
- Open-well submersible pumps function only when fully submerged in water,
- As the pump is switched on, the electromagnetic flux created in the stator induces an electromotive force on the rotor, converting the electrical energy to mechanical energy.
- The pump shaft is coupled to the rotor and the impellers are mounted on the shaft.
- As the impeller rotates, a suction pressure is created at the eye of the impeller. As the water is being sucked, the water gains kinetic energy and pressure (head) is developed.
- The volute, a stationary chamber with a gradually increasing area, converts the velocity head into the desired pressure head, as the water is delivered to the point of use.
- A raised platform on which the pump can rest is absolutely necessary. Sediments or other particles present in the water can get into the pump if it sits directly on the floor. The platform may be usually made of wood, or any similar material.
- Usually, the pump is tied to a rope and the other end of the rope is secured at the ground level. This rope is used for installing and removing the pump during maintenance.
Note: Care must be taken to always ensure that the pump is positioned in such a way that It does not slant because of the weight of the delivery casing on the casting.
Before buying a pump, ensure that you match every aspect of the pump to your requirement.
- Identify the source from which water has to be pumped (well / tank): This is the most important aspect of choosing an open-well submersible pump.
- Tank size: Look for the pump that matches the water delivery requirement.
- Head: The total head is calculated as below
Total Head = Suction Head + Delivery Head + Friction Loss + Fitting Losses
- Suction Head:
- From water surface to pump suction point.
- Can be considered as zero for an open well submersible pump
- Delivery Head: From pump to delivery point.
- Friction Loss: Loss of head due to flow through pipeline.
- Fitting Loss: Loss of head due to the interruption of various fittings. (Gate valve, Check valve & Bends)
While calculating the delivery head and friction losses, consider the length of both the vertical and horizontal pipes until the delivery point.
- Delivery pipe size:
- Delivery pipe size is the diameter of the pipe at pump outlet.
- It is measured in inches or millimetres.
- If there is an existing pipeline, the new pump has to match the delivery size.
- If it is a new pipeline, the delivery size will be decided depending on the distance to which the water must be delivered.
- Material of construction:
- Material of construction should be chosen based on the application.
- Material of construction is important for reliability of the pump.
Open-well submersible pumps are used in various applications such as:
- Irrigation: flood, sprinkler, drip
- Drinking water supply
- Industrial water supply
- Cooling water circulations
- Commercial complexes
- Bungalows and apartments
- Community water supply from a common tank
- Priming is the process of filling the water into the pump to submerge the impeller. This process avoids any air traps that can be detrimental for the pumps.
- Since the pump is submerged in water, priming is not required for open well submersible pumps.
- Always ensure that your open-well submersible pump is fully submerged in water.
Yes. Taro Open-well pumps are safe for all these reasons.
- Open well submersible pumps are safe from electrical shocks as water is prevented from leaking into the unit by a watertight sealed gasket.
- However as with all pumps it is still recommended to keep children and pets away from them.
The pump must be properly earthed before it is used. Do not run the pump without proper earthing.
Open well pumps can run horizontally. This depends on the type of pump selected.
Horizontal open-well submersible pumps must be run horizontally to avoid damage.
Vertical open well pumps cannot be run horizontally.
- Care should be taken to ensure that the open-well pumps never run dry.
- Dry running increases the temperature within the pump and causes severe wear to the pump parts. Prolonged dry running will damage the motor.
- Dry running of the pump can be avoided if floats are used. In such cases, if the water level dips, it will turn the motor off.
- Floats can lengthen the life of the pump and does not cost very much. Floats are a good addition for domestic pumps.
- Taro pumps are designed to run continuously.
- However, it must be remembered that running a pump continuously will cause it to burn out or cause damage to it.
- For best results, use the pump only when required and turn it off at other times.
Pump maintenance is very important for efficient running. Ensure that the pump is checked for maintenance once every six months.