[lroy1000]

hi i have just brought a new tank that is drilled at the bottom, the overflow hole is two inch! got a conector that fitsis a 2inch overlow stan pipe goin into the main tank going to be ok or is this two big????? i can reduce this to 1 and a half.which is best? thanks for any help guys.lee

[emccullough1]

You don't say what size tank. But I would think the tank builder would not have used a 2" if it was not right. But some of the experts my tell you better then me. I still real new my self.

[xrock06x]

depends on how much return flow you put to tank

for example 2 in pipe will move same water as 4 1 in pipes

but i would say you can put one hell of a return pump on it

[pogodzib]

Originally Posted by xrock06x

depends on how much return flow you put to tank

Agree. It all depends on how much flow you're planning on having go through your overflow.

[NATIVEVAMAN]

A 2 inch drain will carry away 2400 gallons per hour.

[e_baer]

So that means if you have 2400gph going into a sump/fuge, you will need that much flow coming back into the tank. That will take one hefty pump!

[NATIVEVAMAN]

It means you could use that much if you wanted to.If youe a 600 gph then thats all you get.He must have at least a 300 gallon tank.

[e_baer]

I would imagine, unless the person before him had all the flow coming form the overflows and return pump. Even then it would have to be a 180 or so.

[NATIVEVAMAN]

Since one of the most imprtant reasons for an overflow is to skim the surface of the water. I would think more smaller ones in a lrage tank( longer) would be a better idea.Like anything 48 inch's and longer should have two,72 inch's and longer should have 3.

[Rainman69]

Originally Posted by NATIVEVAMAN

A 2 inch drain will carry away 2400 gallons per hour.

Thats some info i was looking for. Now what if it were 1 1/2.

[NATIVEVAMAN]

1400 gph give or take 5 gallons lol

[Rainman69]

Thanks. ok it told me thanks was to short how about thank you.

[Ganrin]

Heres a pic of my overflow, 1.5in bulkhead, the inside surface skimmer is 2in diameter reduced at the elbow. This overflow handles a LOT of water, but is significantly noisier than I had hoped for.



I used the "Sanitary" tees and elbows for a smoother turn than standard 90degree elbow, disadvantage to them is they have a shallower socket for the pipe so I went very heavy on the pvc glue, I also used the grey plastic plumbing strap to support the drain (visible at very bottom of picture).

[RyanG]

David that looks good, you do know there are several tricks to quieting an overflow right? One is putting a 12inch piece of plastic, airline sized tubing down, having only about 1 inch stick up out of the top of the overflow and the rest down below.

I did that on my overflow and it make it much quieter.

[e_baer]

Another thing you can do is:

Instead of having the pipe go straight down, have the pipe angle 45 degrees so the water is not falling as far.

[NATIVEVAMAN]

David thats the kind of overflow Noah used back before he built the arc lol.They worked well then and they will work well now.