Steve,
I asked a water treatment process engineer who is working alongside meand they were his thoughts. I'll have a look at my library over the weekend and see if I can come up with anything else.
I have used clear PVC flexible hose laid in cable ladder.. Whenever there was a blockage the operators would go and give the lines a shake. I have also known operators to hit ABS lines encrusted with gypsum with a sledge hammer every morning to break up the scale. Such is technology.
Geoff
--- Steve McKenzie <Mechproj@xtra.co.nz> wrote:
> 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>
> </tt>
>
>
> <br>
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