FAQs
Question : Which are the various types of Pumps available for domestic use?
Question : What is Self-Priming (SP) and what is Non-Self Priming (NSP)?
Question : How much time will it take to fill tanks of 200 and 300 litres capacity using an Usha Mono Block Pump?
Trouble Shooting
Question : What are the precautions to be taken while installing a new Pump?
Question : The motor runs when switched on but does not pump. What should I do?
Question : The motor does not start when switched on. What should I do?
Question : Which are the various types of Pumps available for domestic use?
Answer : There are 3 types of Centrifugal Pumps that are suitable for domestic use. They are:
- Electric Mini Mono Block and Electric Mono Block Pumps
These Pumps are commonly used for lifting water from underground sources to the overhead tank. However, the maximum depth from which water can be sucked is limited to 25 feet.
- Jet Pumps
Jet Pumps are also Centrifugal Pumps, but they possess a jet assembly that enables them to suck water from greater depths in comparison to ordinary Centrifugal Pumps. Jet Pumps can suck water from depths between 60 feet and 150 feet.
- Submersible Pumps
Submersible Pumps again are Centrifugal Pumps. The difference here is that these Pumps are immersed in the water source, however deep it is, thereby eliminating the effect of depth. These are mainly used where water is available at sources that are more than 150 feet below ground level.
Question : What is Self-Priming (SP) and what is Non-Self Priming (NSP)?
Answer : As seen above, a Centrifugal Pump can work only if there is water inside the Pump casing. If there is no water, then no suction will be created. The process of filling water in the casing before starting the Pump is called Priming.
In Non-Self Priming Pumps, water has to be filled manually, before starting. In Self-Priming Pumps, there is a non-return valve that prevents water from escaping from the casing into the suction line. Thus manual priming is not required in a Self-Priming Pump.
Question : How much time will it take to fill tanks of 200 and 300 litres capacity using an Usha Mono Block Pump?
Answer : An Usha Mono Block Pump with a power of 0.5 H.P. takes the following time to fill the tanks, for heads of 18m and 24m.
| Mono Block Pump .5 H.P. |
Time taken to fill a tank of 200 Litres. |
Time taken to fill a tank of 300 Litres |
| Head 18m |
6 min |
8.5 min |
| Head 24m |
8.5 min |
13 min |
|
| Mono Block Pump 1.1 H.P. |
Time taken to fill a tank of 200 Litres. |
Time taken to fill a tank of 300 Litres |
| Head 18m |
4 min |
7 min |
| Head 24m |
5 min |
8 min |
|
Trouble Shooting
Question : What are the precautions to be taken while installing a new Pump?
Answer : Precautions to be taken are:
- Upon installing a new Pump, always ensure that manual priming is done.
- Ensure that there is no leak in the suction pipe as this can result in air blocks being created.
- Ensure that the pipe joints are sealed completely by rolling cotton twine on the screw threads.
Question : The motor runs when switched on but does not pump. What should I do?
Answer : You should check for the following causes:
- The suction line and pump body are not filled with water.
- There are air leaks in the suction line or suction pipe as they are not under water.
- There is air trapped in the suction lines (also possible with flooded suction due to uneven rise in piping. Eliminate humps or hollows).
- There is no water at source or else the water level is too low.
- The valve on the suction lines is closed.
- Leaking check valve or foot valve.
Question : The motor does not start when switched on. What should I do?
Answer : You should check for the following causes:
- The power supply is not connected.
- The supply voltage is too low.
- The Thermal Overload Protector has tripped.
- The motor is not free to turn e.g. a jammed impeller.
- There is an internal motor fault.
- Leaking check valve or foot valve.
