[Digestion] Use of centrifugal pump for transferring feedstock into digester

[Anand Karve]

Dear Marc,
the feedstock is going into the digester all right. So obstruction in the
feed line is not the problem.
Yours
A.D.Karve


On Sat, Nov 16, 2013 at 8:04 AM, Marc de Piolenc <piolenc at archivale.com>wrote:

> There are at least two other possibilities
>
> - cavitation within the pump leading to loss of "prime"; this is heavily
> dependent on where the pump is installed, bends and constriction in the
> feed line and so on
>
> - formation of gas bubbles in the feed; why wouldn't fermentation start in
> the feed, given the right conditions? Those gas bubbles will act just like
> water vapor (cavitation) or air intrusion, and make the pump lose its
> "prime."
>
> The usual remedy is installing a manual, reciprocating pump in line with
> the centrifugal pump. This is used for initially priming the centrifugal
> pump and for re-priming it if it gets gas-locked or "sucks dry." Whether
> this will work with a relatively thick slurry or not, I don't know.
>
> Marc de Piolenc
> --
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-- 
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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