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Aluminium diaphram pump a no no?

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January 04, 2015, 06:48 PM
Aluminium diaphram pump a no no?
Hey Guys,

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)


January 04, 2015, 06:52 PM
Oops I should have searched on that one... please disregard
March 24, 2015, 07:26 PM
Hey Guys,

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:

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..


September 13, 2016, 04:05 PM
Jon Heron
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