Author Topic: Centrifuge photos for Knighty  (Read 17871 times)

Offline nathanrobo

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Re: Centrifuge photos for Knighty
« Reply #60 on: June 05, 2015, 09:26:15 AM »
Quote from: Julian

It's certainly got me thinking that centrifuging finished bio might be a good thing.
[/quote

Yes, me too.
Just been looking at Beyond Biodiesel, someone on there feeds a pressure driven fuge from a pressureised tank, so no need for the pump.

that sounds doable in a stainless water tank. they are designed for 10 bar and you need 7 bar.

I think to run a centrifuge for a sufficiently long period of time, you would need a massive compressor pump, driven by a very big motor (maybe 4hp) with a significant tank, if this were possible.  A gear pump would be much more straight forward.

btw I don't sell fuges any more, but I did learn a thing or two about the whole thing.  If anyone is thinking of the gear pump route - happy to advise.  But in general terms, you don't want a pump with a built in pressure regulator, you should match the pump's flow closely to the throughput of the centrifuge and it's a good idea to ensure that everything has Viton seals.  (I'll guess some of this stuff belongs on Wikki)

Offline nathanrobo

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Re: Centrifuge photos for Knighty
« Reply #61 on: June 05, 2015, 09:37:09 AM »


He was going to write a wiki page on centrifuges and I think started one here ... http://www.biopowered.co.uk/wiki/Centrifuges (spookily there's a picture of my centrifuge on there).  With the logic of something is better than nothing, I'll categorise the page so it shows up in the index, head it as incomplete and upload the photos from photo bucket (or whereever) to the wiki.
[/quote]

I've just taken a look at the wikki page and it looks reasonably complete.  Not sure if I can remember how to edit, or even if I still have editing rights.  But in terms of any changes the only thing that I would add would be a good over view for a fitting kit that would enable folk to cobble together their own (maybe something about hose assemblies rather than reinforced hose and jubilee kits on the pressure side of things), a video showing a centrifuge in operation, cleaning the bowl out, a bit about reassembly (I've known of the occasional bod who has used a monkey wrench to tighten the knurled nut on the top of the bowl and damaged the blow, so that it can't keep it's pressure) and finally something about the usefulness of having a conical tank and pulling from the bottom of the tank - obvious really, but you'd be surprised ;-)

Offline Julian

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Re: Centrifuge photos for Knighty
« Reply #62 on: June 05, 2015, 11:05:17 AM »
Nathan, you still have editing rights, please edit away and shout if you need any help.

Mind you it'll be the blind leading the blind as I've forgotten most of it and have to Google what I want to do.
Used Cooking Oil Collection website ... http://www.surreyusedcookingoilcollection.palmergroup.co.uk

Offline knighty

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Re: Centrifuge photos for Knighty
« Reply #63 on: June 05, 2015, 03:11:07 PM »
compressor / air tank shouldn't need to be that big

even a small DIY type compressor should be able to fill a 200litre tank with 90psi of air faster than you can run 200litres of bio through the fuge ?

Offline Jamesrl

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Re: Centrifuge photos for Knighty
« Reply #64 on: June 05, 2015, 03:49:35 PM »
compressor / air tank shouldn't need to be that big

even a small DIY type compressor should be able to fill a 200litre tank with 90psi of air faster than you can run 200litres of bio through the fuge ?

You'll need a constant 105psi to run even a small pressure fuge at approx 7ltr/min.

Offline knighty

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Re: Centrifuge photos for Knighty
« Reply #65 on: June 05, 2015, 10:31:43 PM »
7litres / min

is 28min to empty a 200 litre tank (empty of bio I mean)

I'd think most compressors could keep up with that

200litres is 7cubic feet

so compressor only needs to do 3.5cfm to keep up ?


http://www.ebay.co.uk/itm/Warrior-240v-24ltr-Air-Compressor-7-3CFM-/181765050344?pt=LH_DefaultDomain_3&hash=item2a520a8fe8

hobby type compressor, it's 2hp and 7.3cfm



:-)