Looking for caculator for bulkhead size

[TheReefGeek]

That calculator looks a little dangerous.

Is it assuming there is pressure on top of the bulkhead or not?

[G1GY]

Originally Posted by TheReefGeek

That calculator looks a little dangerous.

Is it assuming there is pressure on top of the bulkhead or not?

It's for drains. So that would probably mean "free flowing".

[allincuddy]

Well I have a 7/8 inch bulkhead on a 65 gallon tank andit says that size will do 440 gal/hr so that is amax. of 8 turn overs, should be good to go.3 tun overson afrag tank should be good?????
Thanks.

[Samw]

What is linear overflow size? It says that I need 5" for a 300GPH flow.

[mark]

Originally Posted by Samw

What is linear overflow size? It says that I need 5" for a 300GPH flow.

total measurement of overflow tower (wier).

[Samw]

So this is the height from the top of overflow to the top of the waterline of the sump right?

[TheReefGeek]

No, the linear measurement means how long of a distance the water can flow over.

Imagine a waterfall. It is 10 meters across. This is the type of measurement you want.

Now for your overflow, say you have a standard corner overflow, you have two lengths you have to add up for the total linear measurement.

It's for drains. So that would probably mean "free flowing".

"Probably" is not a good term in plumging a reef. Leads to too many floods. That is why this calculator is dangerous. Good as a gernal guide though, a starting point better than nothing.

If you have 20 inches of water in your overflow pushing down on the drain, it is going to flow faster than if you have 5 inches of pressure.

Also you can get some suction/siphoning going, but that is not recommended.

[Static]

Originally Posted by allincuddy

Well I have a 7/8 inch bulkhead on a 65 gallon tank andit says that size will do 440 gal/hr so that is amax. of 8 turn overs, should be good to go.3 tun overson afrag tank should be good?????
Thanks.

Do they make a 7/8" bulkhead? I've never seen any 7/8" pipe. I'm tempted to think you have a 1/2" bulkhead. Is it slip fit or female pipe threads? Remember the size of the bulkhead is actually determined by the pipe that slides/threads into it. And it's the hole inside the pip that's measured, not the outside diameter of the pipe.