how to select submersible pump for borewell

How to Select Submersible Pump for Borewell – Ultimate Buying Guide

Water is quite important – for almost everyone our needs. That should make it obvious enough that a submersible pump assumes an important role in improving the scarcity levels of water in your day to day requirements. The unreliable rain pattern throughout the country and regions and presence of water that is scattered in varying degrees across multiple water reservoirs like rivers, lakes and ponds have been one of the reasons for water scarcity across different regions. This is exactly where a submersible pump can be quite useful and assists you fight the water scarcity to a considerable extent.

What is a Submersible Pump?

A submersible pump or a borewell submersible pump, as the name itself should be indicative is a pump submerged inside the water and sealed completely to make it airtight. There are several wider range of areas that the submersible pumps find themselves useful and practical. A few prime examples can be houses, industries, farm and irrigation and fire fighting systems.

The submersible pumps come with a host of elements that make them a complete solution to resolving your water scarcity problems. The major parts that would make a submersible pump would include AC electric motor, impeller, diffuser, cable guard, and a submersible electric cable. The submersible pumps are kept inside a hole that has been dug inside the earth – called a bore- and is connected to an electrical connection to power it. The pump lifts the water from the ground by converting the electrical energy of the impeller into the kinetic energy of water.

How to Select Submersible Pump for Borewell? Buying Guide:

Like with any other product, you need a few points to keep in mind when you are buying a new submersible borewell pump. Knowing what you should exact will help you better in making the right choice.

Size of Borewell

Borewell size refers to the size of the hole that has been dug inside the earth to place the submersible pump. Your choice of the pump should be lesser in diameter than the actual size of the bore. The reasons here should be quite obvious, as you will not be able to place a larger pump inside a smaller bore quite obviously.

The Head

This refers to the height up to which the pump can lift the water. This will be dependent upon the water table at the location and the size of the housing you have chosen. The lowest level from where the pump is expected to lift the water and the highest level at which the tank has been located is what would contribute to the head or discharge head of the pump.

The difference between the lowest and highest position is called the total head. This is measured in terms of metres or feet and should be chosen based on what your lowest and highest positions are.

Discharge Rate

This refers to the amount of water discharged per minute. If you want to cover larger areas with water distribution- either for consumption or farming, a pump with a higher discharge rate is an obvious choice. This is a measure of the power of the pump.

For storage purposes, it may be sufficient to go with a pump with a rating of 250 gallons per hour should be sufficient. For larger areas or other high-end options like pumping out the flooded area, you will need a pump with the discharge rate of around 1000 or 2000 gallons per hour.

Cooling

Water pumps can get heated up when lifting water and discharging it. An efficient cooling system will be a good option to keep it cool and continue providing efficient functionality in the long run. The submersible pumps can come in either in oil cooled or water cooled functionality.

While the oil cooled pumps are available at cheaper pricing, having to replace the oil at frequent intervals may not be economically viable. Water cooled pumps are expensive but can be easier on maintenance costs.

Material

The material of construction of your borewell pump will also be an important factor in the long run, especially in terms of durability.

A CI graded body and Noryl impeller may be one of the best options you should go with for a more sustainable life span.

how to select submersible pump for borewell

How to Calculate Volume of Water in Borewell?

Well, the basic mathematics tells us that the volume is calculated based on the diameter and height of the well. Calculating the diameter of the well should be easier enough with the help of a measuring tape. For calculating the water height, you need to be slightly innovative with your approach.

If it is a larger hand dug or machine dug well, you can follow this method:

  • Tie some kind of weight to the end of a string and drop it till the bottom of the well, while holding the other side of the string.
  • Make sure that the weight is heavy enough to reach the bottom of the well.
  • Once that done, pull back the string and measure the part of the string that is wet.

This will give you the height of the water storage inside the wall. Now that you have the diameter and height available, it should be easy to calculate the volume of water inside the well.

Formula to Calculate Volume of Water in Borewell

The formula you would be used to calculate the volume of water in borewell would be:

(Pi * D)/ 4)* h

where Pi stands for 3.14, D for the diameter of the well and h for the height of water.

How to Measure Water Level in Borewell?

Well, once again, we need to rely upon mathematics to arrive at the water level in a borewell. The trick lies in calculating the time taken for a small stone to reach the water surface. You will only need a smaller stone measuring around say one inch for applying this trick.

Make sure you have a small stopwatch and a stone. Drop the stone into the water and note the time taken for it to hit the surface of the water. You can repeat the exercise so that you can average-off several readings to arrive at a more realistic value.

Formula to Measure Water Level in Borewell

Once you are aware of the time taken, calculate the water level through this formula:

The water level in metres = 9.8 x the time taken in seconds.

Please note that 9.8 refers to the value of g or the gravitational constant.

Types of Submersible Pumps

There are several types of submersible pumps, and most of these classifications are based on the applications to which these pumps are put to. The working principle of almost all of them remains similar to each other with a few slight tweaks.

#1 Bladder Pumps

Bladder Pumps

These are the types of submersible pumps used for the purpose of sampling of water or other elements. They come with a flexible and squeezable bladder and offer you the option of collecting high-quality uniform samples.

#2 Grinder Pumps

Grinder Pumps

These types of submersible pumps are used for wastewater management. These can shred the solids in the sewage water and send it a higher elevation through the pressure sewers. These are normally connected to the septic pipes of the households or industries and help you carry the water to the sewage treatment plants.

#3 Well Pumps

Well Pumps

These submersible pumps, as the name itself indicates, are used for pumping water from the wells to your household or industrial consumptions. These happen to be a widely used option among the submersible pumps. They can be used for a wide range of applications that include irrigation, farming, residential consumption or other types of storage options.

#4 Fountain Pumps

Fountain Pumps

The fountain pumps are the submersible pumps designed to provide an aesthetic appearance to a place of public interest. They are also used for the purpose of aeration in residential and commercial establishments. They may slightly differ based on the area of the pond to be covered and the functional area that the pump is being used.

Apart from the above basic types of submersible pumps, there are a few other types available based on the exact application areas that you would be using it for. Some good examples would include utility pumps, borehole pumps and other similar options.

What Are The Type of Pipes for Submersible Well Pump

There are several types of pipes used for the purpose of submersible well pumps. However, the most commonly used pipes would include UPVC Column pipes and CPVC column pipes.

UPVC Pipes

UPVC Pipe

The UPVC column pipe is one of the most commonly used pipe types for submersible pumps. In fact, the flexibility and functionality provide you with an added advantage over the other pipe types like metal or other plastic pipes. UPVC or Unplasticised PVC pipes should be one of the excellent options and offer you excellent lightweight functionality. The high tensile load that they offer should make it one of the most powerful option. They also offer you long life performance options.

CPVC Pipe

CPVC Pipe

The CPVC or Chlorinated polyvinyl chloride is yet another material that can work in an excellent manner for enhanced performance for a long life functionality. It offers you enhanced performance in terms of flexibility and can withstand a higher temperature range.

CPVC vs UPVC

Difference Between CPVC and UPVC Pipes

What should you choose between UPVC and CPVC?  Well, both UPVC and CPVC come from PVC.

While the UPVC changed by removing the plasticisers, whereas the CPVC has added chlorination to improve the chlorine content. These modifications help you make it withstand higher temperatures. CPVC can withstand water temperatures to up to 200 degrees F, while the UPVC comes with resistance to up to 140 degrees F. It can withstand hot water effects normally available at residential water treatment plants.

UPVC is more rigid and tough. It is quite transparent and hard wearing material. CPVC comes with high-end flexibility. The CPVC also comes with a high-end mechanical strength.

Recommended Reading - Types of Motors based on Phases – When to Choose What?

The motor that drives your submersible pump comes with two power options. One of them is a single phase motor, while the other is three phase. Under which circumstances will you choose a single phase or a three phase motor?

As a rule, a single phase connection is used for powering the houses and applications that do not need heavy power. Appliances below 1000 Watts can be easily operated with the help of a single phases power source. When it comes to the motors, it would be a good idea to opt for a single phase motor for the motor with a rating of 5 HP or below. If you are opting for a motor rating of more than 5 HP, it may be a better idea to opt for a three-phase connection. In fact, we would recommend opting for a three-phase motor even for the ratings of less than 5 HP for a few obvious advantages.

A single phase motor is likely to draw more current than a three-phase motor and may not offer you a smoother operation. They may also require starting capacitors as well. The three-phase motors, on the other hand, will provide you access to a smoother, more efficient and balanced power supply.

Except for the circumstances where your location or home has no access to a three-phase power source, you may opt for a three-phase motor wherever possible. However, if you are using a motor above 5 HP power, the three-phase motor would be your only option.

Top Submersible Pump Brands in India

Well, here are a few well-known brands that have been successful enough in the realm of submersible pumps.

#1 Kirloskar

Kirloskar – Best Submersible Pump Brands in India

The company has been a well-known manufacturer of pumps and power generation devices. Founded in 1888, the company is located in Pune. In fact, the products are supplied to over 70 countries around the world. The pumps manufactured by Kirloskar are made available in several varieties and models.

#2 Crompton

Crompton

Crompton is a company located in Mumbai and was founded in 1878. You can get a wide range of submersible pumps from across the multiple genres that include the pumps for residential use, agricultural use and other specialised applications. One of the advantages offered by Crompton is it offers you access to the low power consumption.

#3 CRI

CRI

CRI has been the best brand that has been a name synonymous with pumps for over 50 years. The sales and service network offered by the manufacturer makes it a really powerful brand in the genre of submersible pumps. The 1500 number of service centres across the nation would make it a formidable option. In fact, the company has also been involved in the export of pumps to over 120 countries. The company has been involved in the manufacturing of a wide range of submersible pumps, including residential, agricultural, industrial or even solar power source.

#4 V-Guard

V- Guard

The company was launched in 1977 and has been involved in a wide range of application areas like stabilisers, pumps, geysers, pedestal fans and motors, to name just a few. You can be assured of the high end and durable submersible pumps. They manufacture pumps for several application areas like agricultural and residential applications. There are over 13 different pumps that they have been manufacturing.

Submersible Pumps pricing in India

Well, the exact pricing of the submersible pumps would vary across multiple manufacturers and configurations. Do note that the oil filled submersible options would be comparatively cheaper when compared to the water-filled options. However, if you are looking for a well-known brand, the price difference may not be much higher for lower power models.

Ideally, the price we would expect for a 1 HP submersible pump would range across Rs. 8000 and Rs. 9000. The expected pricing for the pumps across different formats can be summed up as:

  • 1 HP – Rs. 8,000 to 9,000
  • 1.5 HP – Rs. 10,000 to 11,000
  • 2 HP – Rs. 12,000 to 13,000
  • 3 HP – Rs. 15,000 to 18,000

The pumps with higher ratings than 3 HP will be available only on quotations.

Concluding Thoughts On How to Select Submersible Pump for Borewell

That was a piece of complete information on borewell submersible pumps. In fact, the information contained in this compilation should help you a make a learned choice when it comes to choosing the best submersible pumps for your borewell requirements. Other than the above mentioned, if you have anything to share related to how to select a submersible pump for borewell, that will help our readers, then please share it in the comments below

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