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Motor Selection - detailed query, Tamilnadu!

Dear Experts,

I am living in a buliding where the total no of flats are 8 (4+4). We have a bore well of 200 feet depth and a overhead water tank located at 30 feet height from the ground. We would like to replace our existing motor with the new one. None of us in the building has the necessary knowledge. I request the experts to throw some light on the following.

1. Type of motor to be fitted


2. We are running the present motor 6 times a day (9 hours) with duration of 90 minutes per run giving rest for 90 minutes between two runs.

3. Capacity of the overhead tank is 6000 Litres. 

4. Total number of users in the building: 22. 

5. Electricity suply: single phase

6. Preferrably a motor that gives less noise - please do mention type

7. Power and other related things to consider while buying

In the existing motor, we are not able to read any data from the label as it is very old and the surface is damaged. The only thing we know is that it is a compressor motor. We are running the present motor 6 times a day ( 9 hours) with duration of 90 minutes per run giving rest for 90 minutes between two runs. Any suggestion to buy a motor that will fill the tank in shorter duration or to reduce the motor running hours.

 

 

Thanking you,

Regards

Thirumal Jayaraman

email: JT_MAL@YAHOO.CO.IN

 

 

 

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Comments

1. Motor Selection - detailed query, Tamilnadu!

Dear Sir,

  • Where is the bore well located. Is it in Tambaram, Chennai?
  • Further at what depth you could get the first water spring gushing out from the bore well when it was drilled?
  • In 90 minutes does your tank get completely filled or how much is the empty volume?  This will help to get some clue. 
  • How old is the bore well?
  • What is the driller reported yield?  

Based on the blind data you have given it becomes trivial to suggest.  Geohydrological and Geospatial data is essential to suggest some practical way forward.

Regards,
A. Raja Mohamed Ambalam
Geophysicist
Chennai 9443619352

A. RAJAMOHAMED AMBALAM GEOPHYSICIST COASTAL ENERGY Pvt Ltd, CHENNAI +919443619352

2. Motor Selection - detailed query, Tamilnadu!

Dear Sir,

Thanks for your quick reply. I am providing the information available with us.

Question: Where is the bore well located. Is it in Tambaram, Chennai.  

Answer: It is in Tambaram Sanatorium near railway station behind corporation bank.

Question: Further at what depth you could get the first water spring gushing out from the bore well when it was drilled.

Answer: This is not known.

Question: In 90 minutes does your tank get completely filled or how much is the empty volume.  This will help to gt some clue. 

Answer: During the initial period when the bore got erected, tank got filled in 3.5 to 4 hrs time. Now, it takes double the time.

Question: How old is the bore well.  

Answer: 14 years old

Question: What is the driller reported yield.   Basaed on the blind data you have given it becomes trivial to suggest.  Geohydrological and Geospatial data is essential to suggest some practical way forward.

Answer: Data not available.

With this information, is it possible to suggest a motor? or what is your advice to get all the required data such as geohydrological and geospatial data?

Thanking you Sir.

Regards,

Thirumal Jayaraman

3. Dear Sir,   If it takes 7 to

Dear Sir,

 

If it takes 7 to 8 hours to fill 6000 liters of tank the average discharge is about 12.5 to 13.5 Liters per hour.  Sir personally I feel the bore well might have got deteriated oaver the period about 15 years and the pump might have got worn out.  The yield is very less and hance they have used the compresser system to maximize the benefit for the investment.  Sice the yield is less it is advisable to go for new bore well drilled at a better site.

Please select the site after conducting groundwater study.  If you do nbot have the provision fir such and for change of pump and from listed data belwo approach any ISI pump dealer to get suitable pump. 

Discharge :  12 LPM or about 70 liters p;er hour.

Pump: Submersible quarter H.P if not available 1/2 h.p single phase submersible pumo that discharge 12- 13 lpm at an instalation depth of  180 feet  with a total head of 200 feet. 

 

Please use threaded type PVC pipe.

With best wishes,

RajaMohamed Ambalam

Geophysicist

Chennai-   9443619352.

A. RAJAMOHAMED AMBALAM GEOPHYSICIST COASTAL ENERGY Pvt Ltd, CHENNAI +919443619352

4. Dear Sir, Thank you very much

Dear Sir,

Thank you very much for your reply. As suggested, we will erect a new bore-well.

Thanks and Regards,

Thirumal Jayaraman.

 

5. Motor Selection - detailed query, Tamilnadu

Dear Sir,

 I have just gone through the suggestions made by RajaMohamed Ambalam where he is suggesting a quarter or half hp submersible pump with a working head of 200 ft. and a new borewell

I would like to make a slight correction here,

A half hp submersible pump would have a maximum delivery head of about 56 mft and would deliver only about 10 lpm ( 600 lph) at that delivery head this would be a 0.5 hp 8 stage pump, beyond this some companies provide a 3/4 hp 10 stage pump, with a maximum delivery head of 70 meters, and again woudl deliver max 600 lph at that working head. Most of the standard submersible companies have pumps having the specifications similar to this give a take 1to 2 meters head difference.

 Coming to the compressor pump- was the compressor pump installed because you had a lot of silt in the water?

If not then it is Ok to replace the pumping system. it could be that the pumping water level in the borewell has been lowered due to development of other wells in the vicinity, and the compressor pumps efficiencey which is based on the submergence of the airline has been drastically reduced- If you have less than 35% submergence of the airline the compressor pump will have an efficiency of only 25%

I would recomend going in for a test pump of 1hp 14stages which would deliver nearly 3000 liters in 1 hour at a working head of 200ft, - see the performance and then either throtel the discharge or go in for a 3/4hp 10 stage pump. if the yeild is not sufficient only then should you go in for a new borewell

Regards

Dr.Anil Lalwani

www.wellwaterworks.com

6. Need help choosing borewell motor

Sir,

Please tell me the best borewell motor for an individual house in Bangalore. Should I go for Texmo or DAB submersible motor?

What is the specification? Do I require a separate motor to fill the water from the sump?

Regards,
Cal

7. Do I need to replace the pump or check for silt deposit

Hello Sir,
We had dug a borewell last year. Water yielded at 520ft. We had dug the bore well till 635 feet. As per the inputs of bore person, we had put 2HP Texmo submersible motor, 25 stage pump. As per the bore person the water source was 3.5 inches. But, we are sure it might not be less than 2 inches if not 3.5 inches. We did not had water problem for 6 months from then.Suddenly we did not get water. Then we opened the motor and pump. As per inputs from mechanic, there was jam with mud/ silt. Later it was cleaned and we are using now. We are getting water continuously. But, the problem is, it is taking 7 hrs to fill 6200 liters sump. Local mechanic is saying we are getting water with 1/2 inch only. Once we replace the 25 Stage pump with 35 stage pump, we would get 1 inch water so that we get water with more speed. Thanks for your clarification, if we need to replace the pump / check if there is any silt deposit in pump so that water is not coming fully.

Regards,
Sarma

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