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Home: KOI Talk: DIY Corner:
DIY Air Induction Nozzle

 





 


larz1
Koi Kichi


Nov 22, 2005, 9:30 AM

Post #1 of 22 (2390 views)
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DIY Air Induction Nozzle Can't Post
I have put a cheap and easy air induction nozzle together, so here are some pix of it.
It isn't really all that original, but it works extremely well with none of the pressure restrictions or head losses encountered with a venturi type. It works on the same principle as a venturi only the discharge is extended through an oversize tee which draws air in around it from the riser.
For this scaled down model I used a 1" discharge pump rated at 2000gph, 1" discharge line, and 1 1/2" for the induction nozzle assembly.
The photo's show the;
1 partially unassembled pieces.
2 assembled pieces.
3 pump running without nozzle.
4 pump running with nozzle submerged 6" deep.
5 pump running with nozzle sumberged 18" deep.
With a little personal fine tuning to fit a particular pump it is an easy way to kill 2 birds with one very inexpensive stone.
This sized down version cost less than $10 to make.


larz1
Koi Kichi


Nov 22, 2005, 9:33 AM

Post #2 of 22 (2386 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Pump running without nozzle.

..........................................With nozzle 6" deep.


(This post was edited by larz1 on Nov 22, 2005, 9:36 AM)


larz1
Koi Kichi


Nov 22, 2005, 9:35 AM

Post #3 of 22 (2385 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Submerged 18"



Koi38
Senior Member


Nov 22, 2005, 9:47 AM

Post #4 of 22 (2383 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Hi Larry,

It is a shame that you have to kill 2 birds for thisTongueLaughSly

Do you mind telling us why you've decided to make one of this now. I know your pond has been running for a while, is it lacking in air or you were just board s@#$lessTongue

Good job btwCool

rgds,
Jon

"DuKu Friendly"
_____________________________________
"No one is ever too old to know better"

http://s3.photobucket.com/albums/y63/Koi38/


koifishgirl
Koi Kichi


Nov 22, 2005, 10:36 AM

Post #5 of 22 (2380 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Larry, can you post a pic of the pump and all the pvc put together? Looks good from what I can see and I do believe this will work for me. Wonder what this would be like at four foot depht?

I like what I see so far.

Judy

Hey Jon dont be so jelous would ya. This is Larry's DIYSly
Judy


larz1
Koi Kichi


Nov 22, 2005, 1:05 PM

Post #6 of 22 (2370 views)
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Re: [Koi38] DIY Air Induction Nozzle [In reply to] Can't Post
I've been intending to do this for a while, but I waited for my dad to show me how he did his while they were here on vacation (his brainchild, not mine). When I add another pool this winter I'll be adding filtration and plan to incorporate this into the filters to add oxygen.


larz1
Koi Kichi


Nov 22, 2005, 1:08 PM

Post #7 of 22 (2369 views)
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Re: [koifishgirl] DIY Air Induction Nozzle [In reply to] Can't Post
I'll take some more pix soon, and I was going to take it out to a friends stock pond to check it at greater depths anyway. Since this is such a small pump it is hard to tell how it will do.


Koi38
Senior Member


Nov 22, 2005, 4:29 PM

Post #8 of 22 (2355 views)
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Re: [koifishgirl] DIY Air Induction Nozzle [In reply to] Can't Post
Hi Judy,

It should work at 4 feet deep. My advice is reduce the air inlet to an inch pipe, this will give you more fine bubbles, IMHO and I tried it before and it workedSmile

rgds,
Jon

"DuKu Friendly"
_____________________________________
"No one is ever too old to know better"

http://s3.photobucket.com/albums/y63/Koi38/


neutokoi
Koi Lover

Nov 22, 2005, 6:58 PM

Post #9 of 22 (2347 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Hi Larry,
The same as Jon, I have question on why you need this, to add more O2, if yes, will it be easier if you just put some airstone, I believe the electricity consumption of aerator will be cheaper as to compare with 2000gph pump.
Coming back to the concept itself, I suspect it works like pic A below, any idea on how to prevent the situation of pic. B to happen? Is that the reason you need an oversize pipe for output ? Thks.


Rgds,
Edo


Koi38
Senior Member


Nov 22, 2005, 7:16 PM

Post #10 of 22 (2344 views)
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Re: [neutokoi] DIY Air Induction Nozzle [In reply to] Can't Post
Hi Edo,

I think your pix are other way around. The output pipe is the large pipe and also the air inlet. The small pipe is where the water is comming from.Crazy This is just base on the "T" piece he used. Its not really a T piece but one of those diverter(well kind of)Wink

rgds,
Jon

"DuKu Friendly"
_____________________________________
"No one is ever too old to know better"

http://s3.photobucket.com/albums/y63/Koi38/


larz1
Koi Kichi


Nov 22, 2005, 10:12 PM

Post #11 of 22 (2332 views)
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Re: [neutokoi] DIY Air Induction Nozzle [In reply to] Can't Post
Koi38 is correct. The water flow is in a straight line from right to left in the pic I posted with the air flowing in from above. The 1" discharge pipe extends about 10-12" past the tee which creates a vacuum that pulls air in around the tee, thus pulling the air in from above. There is no head restriction on the pump as with venturi nozzles, so full pump volume is maintained with the added benefit of O2 mixing with the water.

My purpose for this is twofold. I have to run a pump to feed my waterfall, filters, etc... so why not add air at the same time without need for an airstone. (the nozzle doesn't have to be in the pond, or even underwater to work) Since our biofilters need extra oxygen to work at peak efficiency incorporating this into the filter inlet takes care of that need without adding a blower.
Also, many ponders like to create strong currents in their ponds with recirculating pumps to give their koi some good exercise. (mine perked up and caught the currents as soon as I turned it on) The way I have mine set up in the photos is an example of that type of setting only with the added benefit of O2 without the airblower.


koifishgirl
Koi Kichi


Nov 22, 2005, 11:59 PM

Post #12 of 22 (2321 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
So if I want to do this the water air flow pipe needs to be reduced to what size. I will be using a 3000 hr pump for mine. Should I use a little large pipe or do I need to use same size? Then reduce the pipe to smaller at surface?
Judy


larz1
Koi Kichi


Nov 23, 2005, 1:01 AM

Post #13 of 22 (2320 views)
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Re: [koifishgirl] DIY Air Induction Nozzle [In reply to] Can't Post
It shouldn't matter much. Just make sure your pump discharge pipe is the same size as your pump. The size of your air pipe can be tinkered with if you want, but in my case I used 1" discharge from the pump inserted into 1 1/2" pipe for the air intake. All you need is enough clearance around the discharge pipe to allow air to pass around it. If you want to experiment around with the air intake I would use a reducer at the pond surface rather than use smaller pipe all the way down. That way you can easly remove it from the surface if you need to.
What you don't want to do is use oversize pipe for the water discharge. Velocity is what creates the air draft so if your pump has a 1" discharge don't use 2" pipe on your pump outlet. If you do it won't help your water flow at all, but it will reduce the vacuum on the air intake.


koifishgirl
Koi Kichi


Nov 23, 2005, 1:23 AM

Post #14 of 22 (2318 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
ok, I think I have got what you are saying make sure the out let pipe is same size, I can reduce the pipe sticking out the top of the water to small pipe to increase air pressure right?Crazy If not shall we go over this on more time. Or maybe amount of bubblesCrazy
Judy


neutokoi
Koi Lover

Nov 23, 2005, 9:26 AM

Post #15 of 22 (2304 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Ocay, now is crystal clear....No wonder last night I have difficulties to imagine the concept with my wrong pictureUnsure
It is a modification of venturi system, other than creating pressure for the water flow, we enlarge the output pipe to take the air...thanks..SlySlySlySly

Cheers,
Edo


thiamhwa
Member / Moderator

Nov 23, 2005, 11:49 AM

Post #16 of 22 (2294 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Hi Larz1,
I have observed in aquarium shop whereby this DIY Air Induction was carried out without the need for the
air in-take pipe connection as show in your pixs. Instead a flexible air tube from the air-blow is connected
to the water out-let pipe to create an abundance of added oxygen together with the strong currents
and this could be place at any given depth in the pond.
I have been thinking about this low technology for quite some time, but has not got around to doing it
because of the additional electricity consumption for the added pump.
Thank you.
ThiamHwa


larz1
Koi Kichi


Nov 23, 2005, 12:43 PM

Post #17 of 22 (2289 views)
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Re: [thiamhwa] DIY Air Induction Nozzle [In reply to] Can't Post
My main reason for doing this is to use pumps I am running already to add air at the same time without the added electricity of an airblower. The same pumps that already feed my filters, waterfall, and stream will also be used to add air without additional utilitiesWink. I only connected it this way for demonstration purposesSmile.


thiamhwa
Member / Moderator

Nov 23, 2005, 1:10 PM

Post #18 of 22 (2288 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
 


koiguyoz
Member


Nov 23, 2005, 1:51 PM

Post #19 of 22 (2279 views)
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Re: [thiamhwa] DIY Air Induction Nozzle [In reply to] Can't Post
In Reply To
I have observed in aquarium shop whereby this DIY Air Induction was carried out without the need for the
air in-take pipe connection as show in your pixs. Instead a flexible air tube from the air-blow is connected
to the water out-let pipe to create an abundance of added oxygen together with the strong currents

I have those venturis as well in my aquariums. They operate on the same principle as Larz's DIY air induction and intake tube. Instead of using a solid pipe, the flexible tube is used, both of which are connected to the venturi fitting.


thiamhwa
Member / Moderator

Nov 23, 2005, 2:12 PM

Post #20 of 22 (2277 views)
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Re: [larz1] DIY Air Induction Nozzle [In reply to] Can't Post
Oops! my mistake on the reply posting. It seem to be taking a very long long time for data
to be transfer from the koi.com as well as problem relating to posting.
Sorry for the mis-understanding on the above subject. I do see your points of view now.
Thank you


Koi38
Senior Member


Nov 23, 2005, 4:25 PM

Post #21 of 22 (2259 views)
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Re: [neutokoi] DIY Air Induction Nozzle [In reply to] Can't Post
Hi Edo,

You better take it easy on those cold beersLaughLaughLaugh It gives some kind of side effects if you drink moderatelyTongue

It like normal TPR with venturi system attach to itCool

rgds,
Jon

"DuKu Friendly"
_____________________________________
"No one is ever too old to know better"

http://s3.photobucket.com/albums/y63/Koi38/


neutokoi
Koi Lover

Nov 24, 2005, 9:27 AM

Post #22 of 22 (2242 views)
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Re: [Koi38] DIY Air Induction Nozzle [In reply to] Can't Post
Ha..ha...
In this case is not the cold beer, it was 2 joker (Sarbane & Oxley) from the states that drives me crazy and can not think "normally"....

Cheers,
Edo

 
 
 



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