Id like to use a diaphragm pump for piece of mind but the polypropylene ones are still expensive, theres a cheap 1/2" ali pump available but according to the chemical resistance chart aluminium gets a "D - Severe effect-Not Recommended" with Potassium Hydroxide (50%)and Sodium Hydroxide (80% Solution)
Oops I should have searched on that one... please disregard
Ive got a couple of local New Zealand quotes for the Wilden Original P1 Plastic diaphragm pump:
Wilden ½” P1/PPPPP (Polypropylene)/TNU (PTFE W Neoprene backup)/TF (PTFE)/KTV (PVDF and PTFE Encapsulated Viton)
I think these plastic/rubber compounds are the best choice for making bio?
this comes to 858.83 USD
The versamatic is a fraction cheaper: http://vm.salesmrc.com/pdfs/e5_brochure.pdf
in regards to non sparking pumps what are you guys using these days? is there a cheaper alternative or pump technology??
im really keen to see how cheap (but safely) I can build this processor in the hope others can give it a go.
theres a $100NZD Wilden with BUNA N (nitrile) internals for sale but I gather this isnt safe..
The best pump for making biodiesel in my experience is an open impeller design coupled to a TEFC motor. It laughs at fryer bits and glycerin blobs and produces top quality esters for many hours with no maintenance issues.
Safe and effective.
I would never consider a diaphragm pump for bio production, not the right tool for the job IMO.
Simple schematic for a pump and heater control with a high limit
Sensor for the biodiesel/glycerin layer
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