Looking for caculator for bulkhead size
 

I had one on some place on the internet, punch in the size of bulkhead and it would tell you how many gallons (capacity) it would do. Now I must have deleted it and need to do a calculation.
I have a 7/8" ID on a 65 and wondered if that would give me 3 turn overs or 195 gal. per hour??
If anyone can help, I would appreciate it.
Thanks.

Thank you, exactly what I was looking for.
Thanks again.

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".

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.

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

total measurement of overflow tower (wier).

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

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.

"Probably" is not a good term in plumging a reef. :mrgreen: 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.

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.

In your first post in this thread you asked:
The correct response from me should have been:
Hell no! There is no pressure on a drain bulkhead! Only the weight of any water that is on top of it.(Weight and pressure are two totaly different things.)

My reply with the word "probably" was just a nice way of saying "No pressure....... Only weight."

BTW, there's nothing wrong with this calculator IMO. :)

Ok, so does the calculator assume there is no weight for the flow rates it spits out then?

I am not a physics expert, sorry if I used the wrong terms.

In my basic knowledge of physics, isn't one of Newton's first laws f = m * a, or force = mass times acceleration? Force is aptly named as N, for Newtons.
And water having mass, being pulled down by gravity at 9.81? m/s squared, will create force. That force when partially blocked at a bulkhead would create pressure, pressure expressed as Newtons per square inch? Maybe there is no pressure right at the bulkhead, just the surrounding glass?

I'm not sure, I just think you can put more through a bulkhead where there is more water sitting on top of the bulkhead than if there is none?