3/4 inch Spray Bar - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 04-30-2011, 05:33 AM Thread Starter
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3/4 inch Spray Bar

Making a spray bar to cover most of my tank 60x18x24
how big should the holes be and should the flow be on a angle {4 o'clock angle}

Nu-Clear 533 an 547
Blue Line 55 HD 1100gph pump
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post #2 of 7 (permalink) Old 04-30-2011, 09:44 AM
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start off with a small drillbit and work from there...like 1/8" hole every 2 inches and see how much flow there is and if you don't like it make the holes bigger or put them every 1 inch. I'm assuming you are using PVC, so if you make a mistake it will cost you a whole 90 cents.
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post #3 of 7 (permalink) Old 04-30-2011, 05:45 PM
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You might want to do slots instead with that big pump.
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post #4 of 7 (permalink) Old 04-30-2011, 06:52 PM Thread Starter
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Quote:
Originally Posted by xmas_one View Post
You might want to do slots instead with that big pump.
Hmm Never thought of slots? I'm using a 3/4in x 48in nipple {will be trim down}
I was thinking of good size holes due to the size pump {1/4in every 1in}
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post #5 of 7 (permalink) Old 04-30-2011, 08:06 PM
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I am making a 3/4" diameter PVC spraybar this week too.
Using this calculator http://www.calculatorsoup.com/calcul...ane/circle.php and drilling holes to equal about 75% of 3/4". Basing this on the information from this thread. https://www.plantedtank.net/forums/eq...-manifold.html

Please check my math but
The area of a 3/4" circle is .4417 inches. 75% of that is .33 square inches.
0.049 is the area of a 1/4" circle.
0.028 is the area of a 3/16" circle
0.012 is the area of a 1/8" circle
0.003 is the area of a 1/16" circle
I might be using 6-7 1/4" holes or 11-12 3/16" holes. We will see, this is only the first go around for this one.

My pump is about half the GPH of yours and 3/4" pipe has been working fine for years. Rereading that thread, maybe you need a larger diameter pipe?
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post #6 of 7 (permalink) Old 05-01-2011, 05:44 AM Thread Starter
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Will I went with 1/8in holes every 1in on a 3/4in x 48in nipple it gave me 46 holes ,
Right now I have a 1in pipe 3/4in elbow to 3/4in Y split nozzle and has a strong flow,
My new set-up will just replace the Y split with the 48in Bar. If I have to I will go the next size-up on drill bit.
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post #7 of 7 (permalink) Old 05-02-2011, 05:53 AM Thread Starter
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Maybe I will try 3/16in hole or 1/4in hole every 4in apart
with my 1/8in holes in between?

Will I finish with 1/4 inch holes every 1 inch =46 holes



Last edited by inkslinger; 05-02-2011 at 06:02 PM.
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