Expert advice required for pump selection in Ghaziabad, Uttar Pradesh

This is to solicit an opinion from those who have some knowledge of pumps, etc.

There are 2 submersible pumps that send groundwater to the overhead tank. One is 5kvA, the other is 7.5 kvA. One of these, the 7.5kvA one has been crippled over the last 2 months or so. Despite having given it to an authorized servicing agency, we have not been able to commission it so far. The motor winding of the pump is burning out again and again. We have replaced the motor control panel meters, and the wire that supplies power to the pump underground. Still, no use.

 The pump has seen 9 years, and is probably at the end of its life. So some residents opined that we should buy a new one instead of repairing it. We contacted a major distributor of  pumps, which is a leading brand of submersible pumps in the country. Both our existing pumps are KSB make. The person at the other end asked us the depth of the borewell and the height of the water table. We did our own measurement and the borewell came to be 107ft. deep, and the water starts at about 50ft. from the ground, approximately halfway.

 The pump engineer told us that the amount of water is too less for the power of a 7.5kvA pump. If used, it may burn out or may suck the floor dirt from the bed of the borewell. Coincidentally, our motor is indeed burning out repeatedly, and it has sucked considerable dirt, damaging the blades inside. So, what the engineer told us matches our experience.

All this leads us to the conclusion that the water table has gone down over the last 9 years. If so, I have doubts we will last another decade if we do not do anything fast. Anyway, that is a separate thread to discuss. Ideas there are rainwater harvesting, conservation of water, etc.  The engineer is asking us to buy a less powerful pump, but we know that the 5kvA pump struggles the entire day, non-stop, to get water into the overhead tank. If Ganga water was not there, we will not have 24 hrs. supply today.

Kindly advice us regarding how to proceed regarding the issue.

 Warm Regards

Sanjay Chakravarty
Ashiana heritage Residents Welfare Association ( AHRWA)
Ashiana's Heritage, Plot 14, Sector 4, Vaishali, Dist. Ghaziabad, U.P.

7 April 2009