Re: Lime Slurry Ring Main

From: <Geoff>
Date: Thu Jun 20 2002 - 01:34:00 EDT

Steve,

Mlk of lime at 5.5% will behave generally like water as far as the fluid mechanics are concerned. The problem comes from its propensity to deposit. The higher the solids content the quicker and more frequently it happens.

Generally progesssive cavity pumps and pinch valves are used.

Plastic hoses can be used to enable the overcoming of blockages. Dead ends should be avoided because of settlement.

Geoff
--- smckennz <Mechproj@xtra.co.nz> wrote:

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<tt>

Hi there<BR>
<BR>

I have to design a ring main for slurry about 5.5% solution of burnt <BR> lime. Demand around 17m^3/h.<BR>
<BR>

It has been about 4 years since I have done one and cannot remember <BR> the transport velocity (3m/s minimum, I think) and how to calculate <BR> the friction loss. I do remember that standard slurry theory does not <BR> work very well with this difficult but common material. Also a ring <BR> main will bog out if the solids reach around 10%<BR>
<BR>

Can anyone provide any guidance or references?<BR>
<BR>

Thanks <BR>
<BR>

Steve McKenzie <BR>
<BR>
</tt>

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