New 360 viewable-overflow ?'s

[JettStorm]

Getting ready to have a custom tank built.

200 Gal (60X30 wide x 26 H)
or
240 (60x36x26)

It is going to have a single- center "island" overflow box.

Was planning on having 2 -1 1/4" drains and 2- 3/4" returns. The overflow box size would be 12" x 6" --well that is the plan.

Just wondering if the hole sizes would be sufficient as well as the overflow size.

going to run 2 -1260 pumps.

Just looking for some input/expertise/experience.

Thanks

 

[GrahamJr]

No where enough information. A 1260 GPH hour pump is the pumps flow at zero head(no back pressure), a pump curve is needed and you need to do a system head loss analysis taking into account the piping system loss. 1260 GPH is about 20 GPM or about 40 GPM for two pumps, too high a flow for a 1 1/4' return. But chances are the pumps will be pumping much less do to flow restrictions and back pressure.

Or do what most reefers do......just over size the return line by a bunch. I would use at least a 1 1/2 inch return piping up to the pump suction. Set the second return line as a backup, and the height about a 1/2 inch higher than the main return, that way the second return line is never used until the first blinds or plugs.

CENTRIFUGAL PUMP SYSTEM TUTORIAL

 

[JettStorm]

Let me re word this.

Is that sized overflow box sufficient?

Are 2 -1 1/4" drains sufficient.

Just looking for proper overflow box size and hole size for returns.