Geoff,
thanks for that. At around 5%, I will be a long way from milk of lime,
however, solubility being only around 1g/l or 0.1%, and decreasing with
temperature. The slurry looks far more viscous than water, though, hence my
question. The only reference I have (National Lime Association Manual) hints
at a 10% friction loss margin over water, but is rather vague.
We use rubber lined centrifugal pumps, weir type diaphragm valves, and HDPE
pipe with no dead legs (ring main). I have been tempted to use rubber hose
instead on HDPE, but would prefer to trial first.
Cheers
Steve McKenzie
-----Original Message-----
From: Geoff Stone DD&D Australia [mailto:blenrayaust@yahoo.co.uk]
Sent: Thursday, June 20, 2002 5:34 PM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Lime Slurry Ring Main
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:
<HR>
<html><body>
<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>
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