Overflow bulkhead drilling size

Levent · 01/27/2006, 01:38 PM

I have already ordered my new 213g tank and I'm expecting to receive it next week. The problem is that I could not decide about the overflow drilling yet.

The return pump is an OR6500 with approx. 1200g/h water output at 1.5 meter.

I'm planning to have 2 internal overflow boxes on two sides of the back side of the tank with Durso Standpipes (if I can manage).

According to the instructions found in internet the maximum size of the Durso bulkhead is 1"1/2. Do you think this size of 2 bulkheads would be enough for OR6500.

Or do you have any idea on how to calculate the overflow drilling size for this combination?

Actually there is a calculator at http://www.reefcentral.com/calc/drain.php which asks me to enter the "Gallons per Hour" and calculates the overflow pipe diameter. What is the meaning of "Gallons per Hour"?. Is it the water pumped by the return pump or what?

Thanks in advance for your help.

bertoni · 01/27/2006, 10:33 PM

To Reef Central

Yep, the GPH is the actual water delivered by the return pump. 1200 gph would require a 1.5" hole, I think.

Levent · 01/28/2006, 02:31 AM

Thank you very much both for help and kind welcome.

01/27/2006, 01:38 PM	#1
Levent Registered Member Join Date: Nov 2005 Location: Istanbul - Turkey Posts: 22	Overflow bulkhead drilling size I have already ordered my new 213g tank and I'm expecting to receive it next week. The problem is that I could not decide about the overflow drilling yet. The return pump is an OR6500 with approx. 1200g/h water output at 1.5 meter. I'm planning to have 2 internal overflow boxes on two sides of the back side of the tank with Durso Standpipes (if I can manage). According to the instructions found in internet the maximum size of the Durso bulkhead is 1"1/2. Do you think this size of 2 bulkheads would be enough for OR6500. Or do you have any idea on how to calculate the overflow drilling size for this combination? Actually there is a calculator at http://www.reefcentral.com/calc/drain.php which asks me to enter the "Gallons per Hour" and calculates the overflow pipe diameter. What is the meaning of "Gallons per Hour"?. Is it the water pumped by the return pump or what? Thanks in advance for your help. __________________ Levent Current Tank Info: 1000 lt Reef

01/27/2006, 10:33 PM	#2
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 88,616	*To Reef Central* Yep, the GPH is the actual water delivered by the return pump. 1200 gph would require a 1.5" hole, I think. __________________ Jonathan Bertoni

01/28/2006, 02:31 AM	#3
Levent Registered Member Join Date: Nov 2005 Location: Istanbul - Turkey Posts: 22	Thank you very much both for help and kind welcome. __________________ Levent Current Tank Info: 1000 lt Reef