Use of fliter pipes during bore well rigging

[palmut]

All,

Recently heard quite a few incidents from my friends where in filter pipes are being used along with MS Casing and the regular PVC pipes during bore well rigging. Bore well guys attribute it to silt in the well or the lack of hard rock. Us not being in this business, it is very difficult to figure out whether it actually a true statement or not. Since, we were told that the silt or loose soil will cover the well, we always will go for the filter pipe for the entire bore well depth, which doubles the total cost. Just wondering whether any one had any such experience and are filter pipes really required in Bangalore.

I'm about to dig a bore well and wanted to hear the opinion of the fellow members here.

Thanks

[Virtual-world]

I also got bore drilled last week and the borewell person told that there are soft portions at 2-3 locations and filter pipes were recommended.They try to scare and insist on them. They tell that it will cost @ 150?ft, so the pipe alone will cost equal to the cost of borewell. So i refused and after 8 days got the borewell inspected using a camera, the water was still muddy so I am also in dilemma, as I do not spend so much for pipes+pump etc.but there was no loose soil in the visible portions. So I may go for a compressor pump to avoid the submersible pump getting jammed.

[m3_07]

The muddy content in the water goes away only after a 15 day minimum usage - on a regular basis. Please do not expect the bore to deliver "evian" grade mineral water on Day 1 !!

[ardesarchitects]

Hi
using filter pipes can only be decided by observing the soil while bore drilling.In general silt will look like almost sand.In a very recent case of my apartment project they drilled till 850 and found silt at 500' till 850' after 5 days they checked with camera for installation of filter pipes and realized that bore collapsed till 500'.Now if they need to re-bore will cost them more than actual.So take decision as soon as possible by camera inspection or observe while drilling.

It is recommended to use filter pipes if the soil is loose as you may loose your pump stuck in the bore if it collapses later .Since the pump vibrates a lot deep in the earth crust you cannot anticipate.

Regards
Ar.Praveen.N
Ardes Architects and Interior Designers
ardearchtiects@gmail.com

[palmut]

Praveen - you are right. I did the drilling and was asked to go for filter pipes. Couldn't make out whether there was silt/loose soil but didn't want to take the risk and went for the filter pipes.

[Virtual-world]

The cost of filter pipes is prohibitively expensive almost equal to bore cost. And most of the bore drillers they scare you about silt.In my case from 20' onwards to 650 ft it was stone only at 150 ft and 440 ft during bore drilling he was telling that loose soil is there.So what is the exact criterians for filter pipe necessity? The filter pipes can be independently purchased from dealers.

[palmut]

Virtual-world - I agree that the cost of the filter pipes are prohibitive but I didn't had much of a choice when I was asked to go for it. There are genuine cases where in the loose sand/silt has closed the well. In my case I was told that there is loose soil in the half way mark and hence I didn't want to take that risk. There are different view points and few folks say that filter pipe wouldn't completely prevent a bore well from disintegrating, so on & so forth.

Filter pipes can absolutely be bought independently. In most of the cases the bore well guys don't give you an option and will tell you only at the last moment that filter pipes are necessary. In such cases you have to go with whomever they suggest us (that's what happened in my case). Anyone who is planning to go for a bore well rigging should check for the rates for filter pipe from whole sale dealers, bargain and let them know that you may need it on so&so date. In my opinion, buying & installing it directly will at least save you 20% of the total cost. You can go for the brands you like too. In my case they installed Monarch even though I was inclined towards Finolex.