spray bars - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 01-27-2009, 01:22 PM Thread Starter
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spray bars

Has anyone made their own spray bars for use with canisters? I have the 5/8 tubing and would like to still use the factory intakes but would like to build my own return spray bars. they have some gear at Home depot but i was wondering how many holes and how big should the holes be. Can you paint the pipes as i want them to be black and the elbows are white. and finally i heard that the number of elbows lessen the flow. i would need to change the water direction 3X to get over the aquarium wall and into a spray bar position so will will the water restriction be that bad?
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post #2 of 6 (permalink) Old 01-27-2009, 01:39 PM
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Yes you can make your own and paint them black using Krylon Fusion spraypaint.
Elbows do have an impact on flow but there's obviously a need for some bends of some type to get things in position.

As far as size/length of the spraybar and the amount and size of the holes, it's going to vary from filter to filter as to what works best. I'd just experiment to find out what seems to work best with your personal set up. You could start with smaller holes and drill them bigger as needed.


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post #3 of 6 (permalink) Old 01-27-2009, 02:14 PM
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I made one, used a 5/32 hole at 1" spacing. Painted it with Krylon fusion spray paint, you should sand them with light grit sandpaper before you paint. Had to use 3 90* elbows, dont know how much it restricted the flow. Dont know much about spray bars, but I made one, an its working fine as far as I can tell.

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post #4 of 6 (permalink) Old 01-27-2009, 04:32 PM
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The total area of the holes in the spray bar should be less than the cross section area of the tube. So, if the tube has a .5 inch diameter hole in the middle, and you want 10 holes in it, the diameter of each hole should be less than .5 divided by the square root of 10, or .158 inch. If you wanted 100 holes, they should be less than .5 divided by the square root of 100 or .05 inch in diameter. If the holes are a lot less than that, the water flow velocity out of the holes will be high, but this will cause the filter flow to drop due to the pressure loss. So, you just want them to be a little bit less.

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post #5 of 6 (permalink) Old 01-27-2009, 06:30 PM
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^^^what he said...
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post #6 of 6 (permalink) Old 01-27-2009, 06:48 PM
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Yep, I have done very similar to what Hoppy has stated above. Not so crazy with the math, but if you can get it close enough you should be in good shape.

Its tough to get a perfect straight line of holes in a spray bar, so take your time. If you have a drill press, even better. Set up a nice jig for yourself if you can.


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