Hey Tom; My guess on this is it is not so much the pump but the size of the plumbing. I noticed that one particular pump with the same size motor and impeller was offered with 1" or 3/4" inlet and the throughput was almost the same as a smaller pump with standard 3/4" inlet unless you ordered it with the 1" I then took a look at a whoile bunch of pump curves and what you find is that you won't get beyond about 10-15 GPM with any size motor or pump unless you go larger than 3/4" on the pump inlet. The 90 litre wall I think is related to the 3/4" tank connections on the hot water tanks we all like using not the pump per se but it amounts to the same difference in the end.
I believe it is a waste of time and money buying a larger tank than about 100 litres since as most people find out you can't get a good reaction on about more than 90 litres of oil anyways. Joe Thomas Kelly wrote: > 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 >>-- >>-------------------------------------------------------------- >> This email was sent using Telecom SchoolZone. >> www.schoolzone.net.nz >> >>This email has been scanned for viruses by Telecom SchoolZone, >>but is not guaranteed to be virus-free. >>-------------------------------------------------------------- >> >>_______________________________________________ >>Biofuel mailing list >>Biofuel@sustainablelists.org >>http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org >> >>Biofuel at Journey to Forever: >>http://journeytoforever.org/biofuel.html >> >>Search the combined Biofuel and Biofuels-biz list archives (50,000 >>messages): >>http://www.mail-archive.com/biofuel@sustainablelists.org/ >> >> >> > > > > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > > _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
