another new tank
 

I just setup another tank.72x20x20 external overflow.I got the tank from golds,starfire front.Looks pretty nice.I just got finished plumbing and filling it up.No leaks!:biggrin:

http://i104.photobucket.com/albums/m...ishtank007.jpg

http://i104.photobucket.com/albums/m...ishtank004.jpg

http://i104.photobucket.com/albums/m...ishtank001.jpg

Err, did you put a valve on one of the drains?

I only put a shut off valve on the pump.Was I suppose to put one on the drain pipe.

Yeah, you put one there to throttle back the drain. It makes the overflow box virtually silent.

You can still get one on there. I'll draw a quick diagram.

http://img88.imageshack.us/img88/260...wboxhh1.th.gif

Okay, so the idea here is that you run a stand pipe that nears the water level of the main display. The other drain just gets a grill. With the valve installed, you throttle the drain down until the water level rises just short of the standpipe. Bam, instant silent overflow with the added benefit of zero bubbles in the sump.

Do you have the grill line and the standpipe line tied together after the valve before it goes into the sump ? Do you recomend a length or a specific distance ? Could you add a T below the top of the standpipe to increase flow ? Thanks.

You don't want to do the first and it's unnecessary to do the later. The standpipe won't even be draining water unless the grill clogs. As for putting the two pipes together, it defeats the whole purpose of running a silent overflow since the line coming in will suck in air. Two seperate drains. The primary one uses the valve, the standpipe is jsut backup.

Albert, I'll drop off some graph paper so the next time you can follow the lines with your crayon:idea:

i like how the water is aqua couour so we can tell where the water goes.

Stinky, do yourself a favour, don't bother with a ball valve or "gate valve" (as sold at western pump - actually a knife valve) to throttle the overflow down, www.mcmastercarr.com sells proper gate valves (threaded adjuster). Otherwise you'll be fiddling forever trying to get it right.

Albert - stop taking credit, you didn't come up with this design. Search RC for silent overflow, it's well detailed there.