Drain Size

[Dez]

Just wondering, I'll be running a Herbie style drain (main drain, and emergency drain)....will 1 1/2" bulkheads do it for the drains? Looking at having about 1200 gph to go through there. Or should I go 2"?

Des

[xtreme]

I don't run a herbie, but I do have dual 2" drains with about 1200 GPH running through them. In my case the 2" is overkill and I wish I would have went with 1-1/2". It would also help keep your plumbing a little more tidy, those 2" unions are huge. This chart may also help:

http://flexpvc.com/WaterFlowBasedOnPipeSize.shtml

[mark]

1.5" from RC calculator (http://www.reefcentral.com/calc/drain.php?gph=1300&drain=Submit) is good for 1300gph, but staying 1.5" or if you did go 2" for the primary, could consider 1" or 1.5" for emergency.

[Myka]

1.5" should be good for 1200 gph. I would keep both drains the same size.

1200 gph? Setting up a big tank? :D Be careful with high turnovers...tend to get lots of micro bubbles into the display if you run too much flow through the sump.

[Dez]

Thanks everyone.... I think I should be safe with two 1 1/2" drains. Just wanted to double check before I drill, going to make my overflow box this weekend.

[no_bs]

What would you recomend for a 420g?