Sudden stop of water from borewell
Submitted by rujin5475 on November 5, 2009 - 22:04
Hi all
I am new to this blog, very interesting and lots information here.
Our bore well is about 480ft, we have installed 2Hp submersible pump into the bore well. We used to switch on pump in night because of voltage drop in morning in our area. We used to run motor for 2hrs daily continually and we get enough water (water flow out for 2hrs without any interruption) .
Last month we changed MCB switch in control panel, because it was tripping every time we switched ON. Later our electrician said that MCB as to be changed and he put 30amps MCB switch for m16amps (previous one). After that we didn't had any problem, recently from last week water is not pumped out suddenly.
I can here water dropping sound and ossh sound (motor off). When I switch on the motor, Amp meter show 8-10Amps in control panel. Main meter wheel is rotating, but no water is pumped.
I want to know is that motor problem or no water in bore well. Please let me know what I should do.
I f motor problem How to Identify it on myself.
If water is not there in bore well how to find it.
Regards
Rukesh
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1. Sudden stop of water from borewell
Dear Sir,
Both are possible.
Mostly it is to do with pump. Why did you change the MCB to 30 Amp. For 2H.P motors maximum Ampherage is 10 to 12 depending up on the load.
Changing 30 Amp is not going to solve your problem. Either because the pump is lifting water from deep level or some resistance is occurring in the impeller part of the pump. May be you have not serviced the pump for more than 2 to 3 years. The colloidal clay night have pasted up the impeller blades and some time it will clog the flow of water. Mainly this is reason for taking more amperage.
The pump mechanic has given you the easiest solution. Better you lift the pump assembly repair/service it.
You will be able to pump out the water and I hope you may not have this problem.
Other possibility is that if your water level in the bore well has gone below the main yield zone, then this kind of trickling sound is normally heard and after gushing sound no water will come out, when the water up to the pump level is pushed out. But during this season of the year, I doubt this also very much. During acute drought situation and during late summer it normally takes place. But all of a sudden it may not happen. But slowly the yield will decrease.
Your bore well is 480 feet depth. At what level you struck the yielding zone, that is while drilling at what depth level the water came out of the bore hole. If you struck water yielding zone between 0-100 feet, or 80 feet or 60 feet and you did not get more yielding zone below 100 feet this phenomena is quiet possible which again depends on the general static water level of the area where your bore well is located.
Remote possibility is that some one nearby exactly drilled a bore well on the same line of your underground water stream and pumped out water blocking entry beyond his bore well. Even while his pump is off you should be able to get the water because of natures equilibrium action.
Without location data litho-log details history of pumping data and other geohydrological and geoenvironmental data guessing may lead to mis consumption.
However my experience show that there is something wrong with your impeller blades of your pump. May be service of the pump or replacement of the pump assembly will help. Because to over come the resistance flow the mechanic has increased undemanding scale of the MCB.
With best wishes for the speedy recovery of the bore well.
A. Raja Mohamed Ambalam
Geophysicist
Coastal Energy Private Limited
Chennai. bismi1234786@gmail.com
09443619352
2. Sudden stop of water from borewel
Hi ! Rukesh
I expect that you have installed your pump on a HDPE pipe and it is a single phase pump.
It is naturally that a single phase pump will trip if the MCB rating is 16 amps as it draws nearly 17 amperes at standard conditions.
The pump drawing only 8-9 amperes suggests that the pump is working at no-load conditions or it is running dry.
If you want to know if the pump is Ok and there is no water in the bore well then arrange for a tanker of water to be poured in the bore well and at the same time pump out this water.
If the pump delivers the quantity or near about that much of water that was put in it means that the pump & pipeline is OK and the well has gone dry.
If after pouring water in the bore well the problem persists, then I think you will have to get the pump out - probably the pipeline has developed a leak due to the back pressure.
The oosh sound as you describe it is probably the air and water entering into the pump body as the water level drops below the level of the strainer.
Hope this answers your query
Regards
Dr. Anil Lalwani
Dr. Anil Lalwani
3. Dear Rukesh, The problem is
Dear Rukesh,
The problem is with the pump & its assembly. This same may be rectified with the help of pump installer.
With regards,
D. Chakraborty
Scientist
Central Ground Water Authority (CGWA)
New Delhi
4. Dear Rukesh, Probably the
Dear Rukesh,
The MCB also tripped earlier, as the motor was running dry.
The sound of water you hear is because the water stored in the borewell is not even enough to fill the pipe line and hence as soon as the water supply from the groundwater body is not available, the water column in the pipe falls down.
In this case, please take out the motor pump, and send for servicing and repairs.
With regards,
Sudhindra Mohan Sharma
Hydro-geologist
Indore
Madhya Pradesh
5. Hi All Thanks for your time
Hi All
Thanks for your time and reponse.
Work is done
Fault was with the wire, it is not even taking 15amps load, and even motor is not in good condition. So we repalced to new pump and new submersible cable. now it pumps better than previous one.
thanks a lot
regards
Rukesh