2 inch Overflow Question

Werbo · #1 06-28-2005, 07:17 PM

Does anyone know how many GPH can a single 2 inch overflow accomodate?

I am thinking of using a Ampmaster 4700 (4700GPH) or Sequence 4300 (4300 GPH) as a return. Would this be possible with a 2 inch overflow?

Thanks
Tyler

Invigor · #2 06-28-2005, 07:20 PM

a friend of mine uses 2 2" overflows for 6000gph

I was wanting to use a ampmaster 3000, for about 2800gph(after head pressure and stuff), but reefcentral says minimum size is 2.06" so I decided to go with 2 1.5"

so in theory, it should do around the 3000gph mark. you might have to turn down the pump a little

rickjames · #3 06-28-2005, 07:31 PM

I am just wondering, why do you want to run that much water through your overflow?

Unless it is a huge tank I would run a much smaller overflow rate through your sump and hook a big pump like that to a closed loop or something. Otherwise you will have a veritable water fall for an overflow, and a torrent in your sump.

I have even though of toning down my return pump which puts 750GPH at the head into my 150G tank.

JMO.

danny zubot · #4 06-28-2005, 10:18 PM

Minimum overflow size for 6000gph is 3.2 inches. Here's the calculator.
http://www.reefcentral.com/calc/drain.php

Invigor · #5 06-29-2005, 01:21 AM

Quote:

Originally Posted by rickjames

I am just wondering, why do you want to run that much water through your overflow?

Unless it is a huge tank I would run a much smaller overflow rate through your sump and hook a big pump like that to a closed loop or something. Otherwise you will have a veritable water fall for an overflow, and a torrent in your sump.

I have even though of toning down my return pump which puts 750GPH at the head into my 150G tank.

JMO.

not a "tim the toolman" fan?

rickjames · #6 06-29-2005, 03:20 AM

Quote:

Originally Posted by Invigor

not a "tim the toolman" fan?

Yes I think bigger is better

... I must have not been thinking right when I wrote that post! Maybe "Binford" makes a water pump....

Invigor · #7 06-29-2005, 03:36 AM

haha with a 5hp honda engine on it!

rainmaker69 · #8 06-30-2005, 02:28 AM

Danny Zubot, can you explain the linear overflow size from that calculator please. I have no idea what that means.

Jack · #9 06-30-2005, 02:31 AM

I wouldn't put more than 2000 gph through a 2" bulkhead.

Keep in mind your sump will be a raging river with too much flow.. you'll probably end up with micro-bubbles returning to the main tank.

Johnny Reefer · #10 06-30-2005, 03:12 AM

Quote:

Originally Posted by rainmaker69

Danny Zubot, can you explain the linear overflow size from that calculator please. I have no idea what that means.

I may be wrong but I think it means the length of the overflow siphon box, if that is what is being used.

Cheers,