Re: Pumping Bingham Plastics

From: <Jacques>
Date: Thu Oct 07 2004 - 08:39:00 EDT

Steve, that's a whole lot of poo. Based on 700 tons per hour and assuming a consistency of 40% by volume and a specific gravity close to water, this corresponds to a flow rate of 7000 USgpm. You will need a 20" pipe at this flow rate.

You are going to need several positive displacement pumps, maybe some large progressive cavity pumps. As you know with positive displacement pumps the main sizing criteria are flow throughput (gpm) and viscosity, the pressure produced by the pump is normally higher than required and must be relieved. I suspect the pressure level required will be quite high in order to overcome friction for 12 km, the pipe will have to be very robust especially at the beginning of the system. To calculate the friction and therefore the pressure requirement I suggest you do some research in books that deal with fluid handling in the food sector. I wonder if a conveyor might have a comparable cost to a pump system.

Cheers,

Jacques

• Original Message -----
  From: Steve McKenzie
  To: <a href="/group/PipingDesign/post?postID=_-a_mEFRre0ZAYf982EAcVSeKyBHjCn1aWvlkbf4cM4srOhN7s8r4e0k89Uo_0p52AaJhj6Xzg6x0n_URvhkLfwh5hmV6g">PipingDesign@yahoogroups.com</a>
  Sent: Thursday, October 07, 2004 4:19 AM
  Subject: [PipingDesign] Pumping Bingham Plastics
  

Gents + 2

I have been requested to prepare some tails disposal pumping options
using thickened tails from a paste thickener.
The process consultant has told me to expect a process fluid with
Bingham plastic properties, a yield stress of around 100Pa and a
consistency of baby poo. Quantities will be around 700TPH solids and
transport distance around 12km.
All to be sorted by monday - no sweat - who wants a life anyway?
Before I bury my head in books (e.g. Wilson, Addie, Sellgren and
Clift, has anyone seen any good design references for estimating pipe
friction loss with this sort of stuff?
Will probably go to a recip type pump in order to be sure I dont wind
up with a frozen pipe because the thickener had an "episode".

Thanks

Steve

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[Non-text portions of this message have been removed] Received on Thu Oct 07 08:39:00 2004