Charles,
The impeller in the clearwater pump is metal. Plastic impellers will
eventually fail in pumps used to agitate the reaction.
My experience w. the clearwater pump is that it will handle up to 90L
(~ 24 gal) batches. Above that, even after three hours reaction time, I have
gotten incomplete reactions.
Congratulations on your success scaling up.
Tom
----- Original Message -----
From: "Charles List" <[EMAIL PROTECTED]>
To: <Biofuel@sustainablelists.org>
Sent: Wednesday, July 19, 2006 7:43 PM
Subject: [Biofuel] Pump choice
> Hi All
>
> Thanks to all who have advised me this last few months, I am now a
> biofueller! 105l batches, good product. Unfortunately, after 10 good
> batches, my pump has started spraying out of the back of the impeller
> housing. So I took it apart and the impeller has broken up and the
> housing has been eaten through at the back, around the mechanical
> seal. It was 30 years old or so, free and a plastic spa pump, so I'm
> not too distressed, but I obviously don't want it happening again.
>
> I notice that the clearwater pump used by JtF is made of cast iron,
> so should my next pump be made of metal? Also, is the impeller in the
> clearwater pump plastic? As I know you can get some with stainless
> steel blades, I wonder my impeller break-up was due to age or chemicals.
>
> Thanks
>
> Charles List
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