Flow rate through two 1" drains?

yellowtruck75 · 02/01/2008, 08:03 PM

What flow rate will I get through dual overflows with 1" drains? What kind of return pump can I use for a 9' raise from the basement?

Thanks
yt

Gary Majchrzak · 02/01/2008, 08:09 PM

did you see this:

http://www.reefcentral.com/calc/drain.php

ManotheSea · 02/01/2008, 09:00 PM

This is a great question that I would also like to learn.

You have to play with the numbers to get to your drain size on that calculator.

What I dont understand is when I input 600 gph, which is widely recognized flow through a 1" u-tube, I get 1" drain as the result. I would have thought that a 2" drain would equal 1200 gph but instead the result is 2350 gph. Why is that?

Also, I would think that a submerged drain would flow at a higher rate than a u-tube that has to fight the forces of gravity.

Gary Majchrzak · 02/01/2008, 09:10 PM

Quote:

Originally posted by ManotheSea
This is a great question that I would also like to learn.

You have to play with the numbers to get to your drain size on that calculator.

What I dont understand is when I input 600 gph, which is widely recognized flow through a 1" u-tube, I get 1" drain as the result. I would have thought that a 2" drain would equal 1200 gph but instead the result is 2350 gph. Why is that?

flawed thinking

two (2) 1" drains will give you 1200 GPH, not one 2" drain.

yellowtruck75 · 02/01/2008, 09:59 PM

OK so I should expect 1200 GPH through my two 1" drains?

silverwolf72 · 02/01/2008, 10:14 PM

If you do the math for a 2" drain area you'll find the area is a bit bigger than 2 1" drains. thats why you can flow more threw a 2" drain

ManotheSea · 02/01/2008, 11:03 PM

OK Now I can see it. Without doing the exact math yet, you can roughly fit four 1" circles into a 2" circle. So you have four times more flow space with a 2" drain than a 1" drain. Hence the 2350 gph rate of the 2" drain. Thanks.

02/01/2008, 08:03 PM	#1
yellowtruck75 Registered Member Join Date: Sep 2002 Location: WATSONTOWN PA Posts: 2,171	Flow rate through two 1" drains? What flow rate will I get through dual overflows with 1" drains? What kind of return pump can I use for a 9' raise from the basement? Thanks yt

02/01/2008, 08:09 PM	#2
Gary Majchrzak Team RC Member Join Date: Nov 2001 Location: Rochester, NY Posts: 41,560	did you see this: http://www.reefcentral.com/calc/drain.php __________________ over 24 years experience with multiple types of marine aquarium systems see Upstate Reef Society Forum on RC and FB GOOGLE JUNIOR'S REEF Current Tank Info: 84x24x30 265g reef past TOTM honors

02/01/2008, 09:00 PM	#3
ManotheSea Registered Member Join Date: Nov 2006 Location: FL Posts: 414	This is a great question that I would also like to learn. You have to play with the numbers to get to your drain size on that calculator. What I dont understand is when I input 600 gph, which is widely recognized flow through a 1" u-tube, I get 1" drain as the result. I would have thought that a 2" drain would equal 1200 gph but instead the result is 2350 gph. Why is that? Also, I would think that a submerged drain would flow at a higher rate than a u-tube that has to fight the forces of gravity.

02/01/2008, 09:59 PM	#5
yellowtruck75 Registered Member Join Date: Sep 2002 Location: WATSONTOWN PA Posts: 2,171	OK so I should expect 1200 GPH through my two 1" drains?

02/01/2008, 10:14 PM	#6
silverwolf72 Registered Member Join Date: Jul 2005 Location: Lake Forrest CA Posts: 1,732	If you do the math for a 2" drain area you'll find the area is a bit bigger than 2 1" drains. thats why you can flow more threw a 2" drain

02/01/2008, 11:03 PM	#7
ManotheSea Registered Member Join Date: Nov 2006 Location: FL Posts: 414	OK Now I can see it. Without doing the exact math yet, you can roughly fit four 1" circles into a 2" circle. So you have four times more flow space with a 2" drain than a 1" drain. Hence the 2350 gph rate of the 2" drain. Thanks.