How to size a pump?

[street fish]

I'm not sure where you get your calculations that two 1" bulkheads will handle 700gph. Multiple people on this thread has told you each 1" bulkhead will handle 600gph draining and since you will have 2, that means 1200gph

I think I have been confusing gravity versus siphon "drainage". I did not take into consideration the fact that the overflows will create a "siphon".

Therefore, when I mentioned the 350gph for a 1" bulkhead, I must have been referring to the "gravity" drainage?

So finally, I am trying to understand how you can have a pump that pushes less than 1200gph? When you have a sump and a return pump in place, won't it create the same "siphon" effect, resulting in 1200gph drainage? So wouldn't a return pump with anything less cause the sump to over flow?

 

[ming]

Thanks Motortrendz, this is very helpful.

Sorry guys, this whole time I was under the impression that since my 1" bulkheads would "drain" x amount of water, I thought the return pump needed to match that amount (after headloss). Can someone help clarify, I feel like I am missing something.

Also, can someone direct me to where I can learn what a "manifold" is?

Apologies if these questions are all extremely elementary. I have been trying to read all the sump setup guides, and I have not been able to find this level of detail.

Thanks everyone

They do not need to match, but obviously you don't want to pump more water then the drain can handle. Its optional to pump less though.

This is an example of a manifold. Its to split a single source to multiple outlets
http://www.livingcoralreef.com/blog/wp-content/uploads/2010/01/100_1271.jpg

 

[ming]

I think I have been confusing gravity versus siphon "drainage". I did not take into consideration the fact that the overflows will create a "siphon".

Therefore, when I mentioned the 350gph for a 1" bulkhead, I must have been referring to the "gravity" drainage?

So finally, I am trying to understand how you can have a pump that pushes less than 1200gph? When you have a sump and a return pump in place, won't it create the same "siphon" effect, resulting in 1200gph drainage? So wouldn't a return pump with anything less cause the sump to over flow?

overflows does not create a siphon, it should go down from gravity. the "teeth" on the overflow is the lowest area so water goes into them and into the overflow box. Is this your first reef ready tank? I'm not sure if you understand about a durso either. It sounds like you only had overflow boxes previously which work with a siphon method.

A pump is forcing water up, not sucking water down. not to mention a pump operates under pressure so it can push more then 600gph through a 1" hole.
Your tank can only overflow up to where the overflow box is. Water can't make its way down unless there is excess water above the teeth mark.
An example is to put a full cup of water, if you pour another cup of water, on
top of it, only a maximum of 1 cup of water is spilled over. You can't overflow more then what is pumped into the tank.

 

[NL146]

At Masterswimmer's request while I review what I said ha ha. I'm falling off my chair man!!

 

[NL146]

Yeah, what Ming said lol

 

[masterswimmer]

<POOF> Gone~~~~



swimmer

 

[NL146]

Sorry about this Nigel........this is wrong and should not be considered when you do your plumbing. I'm sure you know what you're talking about, but it came out wrong in this post. Please, if you don't mind, delete this post....pretty please. It'll only confuse street.

swimmer

Now, as long as you have it quoted in your post, it still exists :spin:. You can pm me or post what specifically was wrong.

 

[NL146]

...I'm sure you know what you're talking about...

Don't assume... :spin:

 

[street fish]

They do not need to match, but obviously you don't want to pump more water then the drain can handle. Its optional to pump less though.

This is an example of a manifold. Its to split a single source to multiple outlets
http://www.livingcoralreef.com/blog/wp-content/uploads/2010/01/100_1271.jpg

Thanks Ming for the Manifold reference

 

[street fish]

Ming - very helpful. Yes, this is my first RR tank, I am finding it much more complicated than using a canister filter.

So when you are referring to 1" bulkheads having a capacity of 600gph, you mean 600 gallons per hour drain from the bulkhead owing to gravity?

overflows does not create a siphon, it should go down from gravity. the "teeth" on the overflow is the lowest area so water goes into them and into the overflow box. Is this your first reef ready tank? I'm not sure if you understand about a durso either. It sounds like you only had overflow boxes previously which work with a siphon method.

A pump is forcing water up, not sucking water down. not to mention a pump operates under pressure so it can push more then 600gph through a 1" hole.
Your tank can only overflow up to where the overflow box is. Water can't make its way down unless there is excess water above the teeth mark.
An example is to put a full cup of water, if you pour another cup of water, on
top of it, only a maximum of 1 cup of water is spilled over. You can't overflow more then what is pumped into the tank.

 

[ming]

Yes

 

[street fish]

Great - thank you

 

[masterswimmer]

Now, as long as you have it quoted in your post, it still exists :spin:. You can pm me or post what specifically was wrong.

<POOF> Gone

I'll shoot you a PM

 

[kaOzGrUnT]

Hey Message me if you need help with planing and doing the manifold, most people are willing to go over someone's house and help.

 

[street fish]

Hey Message me if you need help with planing and doing the manifold, most people are willing to go over someone's house and help.

Thanks Kaoz - much appreciated.

 

[street fish]

Please see my new thread!

http://www.manhattanreefs.com/forum...etup-pics-please-comment-220-gal-acrylic.html

 

[batt600]

Here us this program It Calculates you plumbing to your pump and give you an accurate GHP from pump to tank . http://www.reefcentral.com/calc/hlc2.php