Overflow help

[johno27]

I am installing overflows into my tank and need some help

Using 2 1.5" bulkheads and pvc. I am very confused about what level I should set the bend in the pvc to keep the tank water above the rim but not overflowing

I haven't purchased the pump yet but I am plannning on getting a 3,000 gph pump

In theory I was thinking the top of the inside of the bend of pvc should be the max water level.

Appreciate any insight anyone might have

 

[jauqs]

Hi John . . .

This my first post here, and I'm in the planning stage as well. Your design follows the same principals as mine except I've included stand pipes in the tank to allow water from the lower portion to flow into the overflow.

To answer your question though I think the return pump will play a major part in your plan.

The way in which the elbows are set up you should simply be able to adjust the height by twisting the upward flow more horizontal.

I'm also waiting to hear from someone with more experience, so this is more a bump than an answer.

 

[vamptrev]

ive never used this design b4 so im not positive but i would say the top of the water line should be close to the top of the second 90

i think a 1 1/2" pvc will only drain 2k gph going straight down, and your not going straight down. u will be pushing the limits on draining 3k gph, so the water line will be on the high side

u should prob tee off the pump back to the sump so u can control the flow rate

 

[johno27]

I went with a 2500 gph pump because I was thinking the same thing. Hopefully I won't have to tee it off but I will be ready just in case.

Thanks for the input, I will report back my results when I test it out

 

[leather]

I would take one side and do away with the tee and go straight to the sump. On the inside of the tank, you can do a 90 up with a strainer. This pipe will siphon, install a gate valve to restrict flow. The other pipe you can do what you were doing but I would do the same as the first pipe, only install a 90 inside pointing up with a piece of pipe to where you want the water line, then strainer. Once the pump is running you cut pack on the gate valve on the first pipe until it just starts to overflow the second pipe. This will be very quiet and should flow the required amount of water.

 

[johno27]

Thanks for the input, I am really trying to avoid having water drawn from the surface of the tank because I feed a lot of floating foods and I would constantly be cleaning a strainer if it was at the top.

I will keep that in mind for a backup plan if what I hope to do doesn't work out

 

[leather]

The siphon pipe won't be at the top of the tank, depending on how low the holes are it should be 2 inches under surface to avoid noise. The other pipe won't be drawing anything unless something is wrong with the main pipe. I have the same set up and feed floating pellets with no problem.