RE: Bore rehabilitation methods

From: <Steve>
Date: Tue Jul 06 2004 - 17:43:00 EDT

Hi Robin

no I don't have a recent analysis, but have plenty of iron and silica in the water.
When the bore is disturbed, the water turns red and occasionally corroded bits of the bore liner pipe (steel) get sucked out. After a disturbance, the water takes on a cloudy appearance for a few days; it looks like colloidal silica. When everything is fine and settled, the water is crystal clear and odour free. At the moment, it is milky rust brown and has that haem odour.

Cheers

Steve

-----Original Message-----
From: Robin Badcock [mailto:rbadcock@vision.net.au] Sent: Wednesday, July 07, 2004 12:52 AM
To: <a href="/group/PipingDesign/post?postID=0IXOuBqIN44Co31l4kC6rdfWOKsnB0vvsr5EZ-FenR25eM_utwUICZM7aYCMrmjhYYMf41UxeE3TF_TO5Ykmeiyubw">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] Bore rehabilitation methods

Steve,

Have had a fair bit to do with domestic bore holes and water supplies over the years. Do you have a current constituent analysis of your water as this will no doubt provide indications as to the nature of the screen blockage and you shall be able to make an informed decision as to how best to treat this. We have a degree of problems with iron fouling and other such build ups that reduce inflows to wells and pump intakes.

Cheers,

Robin

• Original Message ----- From: "Steve McKenzie" <mechproj@xtra.co.nz> To: <PipingDesign@yahoogroups.com> Sent: Tuesday, July 06, 2004 7:04 PM Subject: [PipingDesign] Bore rehabilitation methods

> Gents + 1
>
> my water bore at home has nearly given up the ghost.
> I dont know much about it except that it has a 40mm HPDE pipe
> concreted (at the top) into a 65NB steel liner. And its old. No idea
> of the depth I cannot extract the HDPE pipe because of the concrete,
> and if I did, I may not be able to get it back in.
> The bore is slightly artesian;overflows very slowly at zero load.
> However if I pump it, the pressure drops to around 7m lift which is
> all the pump can do. Pumped, I guess the current yield is around 5
> lpm; used to be about 30 lpm.
> I suspect the screen is blocked and am wondering about trying a
> backflush, with either compressed air or water, ot try and clear it.
> Any ideas/references?
> Cost of a new bore is $10,000 with no guarantee of water.
>
> Cheers
>
> Steve
>
>
>
>
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Yahoo! Groups Links Received on Tue Jul 06 17:43:00 2004