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 Post subject: Re: Damian's system.
PostPosted: Nov 27th, '13, 23:11 
I used these 40mm bulkhead fittings......

Slightly different application shown... but I used the same things for swirl/biomesh filtration... and re-adapted as a radial flow...

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Last edited by RupertofOZ on Nov 27th, '13, 23:15, edited 2 times in total.

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 Post subject: Re: Damian's system.
PostPosted: Nov 27th, '13, 23:13 
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 Post subject: Re: Damian's system.
PostPosted: Nov 27th, '13, 23:20 
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The only ones i can get don’t have the flange,just the nut,they are more like pipe connectors than bulkhead fittings.We don’t have tanks in Thailand :laughing3: honestly. So that flat area of the nut face is all i have to work with and I’m not joking about the tank thing.

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 Post subject: Re: Damian's system.
PostPosted: Nov 27th, '13, 23:29 
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"Murray is commenting on the Green Sky Growers operation... a high tech showcase system... (as he says)... that was never commercial.. by their own admission... and has long since closed...

Yes Green Sky Growers did use LOX.... but Murray was commenting on the "operation"... not on LOX specifically... of which he would not have had any knowledge basis to comment anyway..."

Having run this entire operation for 2years and increased output by 6x fold I can tell you that we never used LOX, we used an Airsep O2 Generator with Speece Cones and it never closed (still in operation today). He should be commenting on technology he doesn't even understand. LOX and high density aquaculture were developed b/c in many operations it is CHEAPER than running on atmospheric air and compressors. Especially true in aquaculture, you generally want as much as you can get in the smallest space possible. If you are constructing a 2acre building for your operation using high densities and LOX, it might take a 6-8 acre building if using standard aeration. This also means more tanks, more water quality measuring instrumentation, more alarms, more labor, etc etc etc. when you have never worked with LOX, never worked with any large-scale aquaculture operations, and don't have a fundamental understanding of large-scale aquaculture design and operation, of course it seems crazy to use something like LOX. But that's the point... This stuff isn't developed because someone just wants to make an operation more complicated, they are developed through years of trials and testing to formulate the most efficient design and most profitable operation.

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 Post subject: Re: Damian's system.
PostPosted: Nov 27th, '13, 23:35 
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"Not without direct oxygen injection... IMO.. barely even at the 50kg/m3 end of the scale... and completely impossible as you extend above that ... read some basic aquaculture theory... or even basic science theory.."
One of the large "commercial" USA farms just said they have 800lbs of fish growing good in a 1300gal tank... Yeah right, the compressor is TINY and no O2 in sight. I'm at 1/3lb/gal and am starting pure O2 injection during heavy feeding events.

"Build a radial flow filter to the specs shown in the two Earthan Group links above... and it will work just fine...
" I don't want to step on anyone's toes here but I doubt this design is any more efficient than a swirl separator... Anyone else see the flaw in this design that makes it's efficiency vs a standard manufactured RFS? L

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 Post subject: Re: Damian's system.
PostPosted: Nov 27th, '13, 23:43 
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Ryan please expand on this,i would like to learn more.

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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 00:58 
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dasboot wrote:
Ryan please expand on this,i would like to learn more.


I would as well.


If I hit 35kg/m3 I am fine with that.

I just got a call for some funds to buy a 1kw off grid solar system so i will be ready to start up the system soon maybe for early next year.


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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 01:33 
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RupertofOZ wrote:
http://www.aquaponics.net.au/forum/arch ... -3748.html

And we've been saying so... for years... please do not advise "beginners" to even attempt to stock at those levels.. even with Tilapia... unless you address the design of a system from a total RAS aquaculture perspective...


Why do you have an aversion to Commercial operations, all sizes? It is evident in most all forum threads, for example the given link. A stance toward risk can help but this looks like you have something else in mind.

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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 01:40 
I thought my views/reasons.. were pretty clearly expressed... in a post in that thread...

Quote:
The use of the term "commercial" ... with regards to a lot of recent operations makes me uneasy... as I think, one they're not... but more importantly, that they might mis-represent the viability of aquaponics as a "commercial" concept... whether intended, or otherwise....

The use of the term "commercial"... with regards to training courses... based on existing hobby farm operations....is IMO... a complete mis-representation... and bordering on being "unethical"... if not dangerous to the concept and/or potential of "commercial" aquaponics...


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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 01:48 
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Ryan wrote:
One of the large "commercial" USA farms just said they have 800lbs of fish growing good in a 1300gal tank... Yeah right, the compressor is TINY and no O2 in sight.

I'm at 1/3lb/gal and am starting pure O2 injection during heavy feeding events.

Wow.. brilliant.. 73 kg per 1000L and in your case... 37 kg per 1000 L. Thanks for sharing this info, Ryan.

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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 01:53 
I think you've missed the point... Ryan is being sarcastic...

73kg per 1000L.. and no O2 in sight... yeah right.... :lol:

And Ryan is beginning to add direct oxyen injection... at his level of 37kg per 1000L....

Suggesting that as I said... "beginners" should not be encouraged to even attempt 50kg per 1000L...

And that it's not obtainable.. even by the experts.. without either a large amount of water volume... and water turnover.. or direct oxygen injection...


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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 02:54 
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RupertofOZ wrote:
the concept and/or potential of "commercial" aquaponics...
I am just curious and want to ask... To you, what exactly is the concept and/or potential of commercial aquaponics?

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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 03:08 
The concept... and potential for aquaponics to be "commercially" viable as an alternate food production methodology..


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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 05:26 
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dasboot to go through blue drum side walls with 2in m/f adaptors a first cut the hole as snug as i can then I make washers from 2in rubber couplings. You can cut the couplings to suite the curve, apply silicon to taste.

I never tried as wide as 3in with this method. another way will be to cut peace from another blue drum and sillicon that to the side where you want to connect your inlet and sand that area flat with a power sander.

About the concreat cone on the bottom to get it seal I would use some type of food safe 'paint on' something.

Or

Leave it ruff and grow some type of carpet moss or something.


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 Post subject: Re: Damian's system.
PostPosted: Nov 28th, '13, 05:53 
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http://web.utk.edu/~rstrange/wfs556/htm ... -cont.html
Nice link talking about Oxygenation.


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