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Old 06-08-2008, 12:17 AM   #1
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return pump power

Hi ive been looking around for something that shows me how to calculate what power my return pump should be.

I stumbled apon

Reef Central Online Community

But i dont know which formula i need to use because I dont see one that allows me to put in the size of my hole (1.5) and the length of my pvc pipe down to the sump.

I read after searching "pump" in this forum that I need to calculate my "maximum overflow rate"

How do i do that?



ImageShack - Hosting :: rturnyn5.jpg

(I dont have one of those boxes that the water overflows into, i just have one of those cone shaped things that is screwed onto a hole that is 1.5inc diameter)

Also people will similiar situations (75gDT) (30gsump) are using a product called MAG 7 or MAG9. So i just need to know the GPH pump power i need.

If anyone can help or point me out in the right direction that would be great!


Thanks in advanced.
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Old 06-08-2008, 10:16 AM   #2
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The first thing to look at is your drain hole. You said the hole is 1.5". Is that the size of the actual hole or the size of the pipe? (btw...that is going to be very loud when the tank is running). 1.5" pipe will let you drain about 1200 gph, 1" pipe is about 600 gph.

Now use the head loss calculator. Enter the info for your return line plumbing. You want to result to be less than what your tank can drain. For example, you don't want to have 800 gph after head loss and only a 600 gph drain.
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Old 06-08-2008, 11:23 AM   #3
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Ok so for that I have to have my return plumbing made, or calculated.

I got these results



ImageShack - Hosting :: headlossep9.jpg

I estimated that my return system be like this.



ImageShack - Hosting :: rturn2qn0.jpg

Since your saying its going to be a lot of noise with a 1.5 hole, i cant really make it smaller, do u suggest i use 1" pipes by converting the 1.5 to a 1?
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Old 06-08-2008, 02:18 PM   #4
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It's not the size of the pipe that will cause the noise, it's the water that will be gurgling down that strainer.

Don't down size your plumbing.
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Old 06-08-2008, 03:34 PM   #5
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Do you have any suggestions that I could do to minimize noise?
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Old 06-08-2008, 05:35 PM   #6
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How far below the top of the tank is the 1.5" drain hole?
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Old 06-08-2008, 06:41 PM   #7
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its about 2 inches from the very very top of the tank
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Old 06-08-2008, 06:42 PM   #8
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Quote:
Originally Posted by cccapt View Post

Don't down size your plumbing.

Does that mean my return piping should also be 1.5" ?

Or can I make it 1 or 1.25?

Cuz I noticed the biggest size mostly in HD or other stores is 1.25...
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Old 06-08-2008, 11:24 PM   #9
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Old 06-09-2008, 02:31 AM   #10
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Danner Mag-Drive Supreme 5 500 GPH Water Pump (Saltwater Aquarium Supplies > Water Pumps > Submersible > 500-1000 GPH )

My Drain line is 1" PVC and my return line is 3/4" vinyl tubing it works great. I wouldn't get anything less than that. 1.5" Drain line and 1" return line would be even better. Using flexible vinyl tubing prevents having restricted flow hard PVC elbows will slow the flow and its bad for the return pump. and The bigger the drain line the better so you don't have to worry about whether or not the drain line can keep up with the flow or not.

Hope this helps
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