Project External Glass Overflow

Well, I wanted it wider since I had planned on putting my closed loop inlet in the overflow box, so I needed the slot wide enough to handle the extra flow.

What do you think the minimum slot size would be to have 2 1" bulkhead drains to the sump and a 1 1/2" - 2" bulkhead for my closed loop Sequence Dart?
 
mr_alberta said:
Well, I wanted it wider since I had planned on putting my closed loop inlet in the overflow box, so I needed the slot wide enough to handle the extra flow.
Click to expand...

You may wanna rethink this..... I personally beleive if you put the inlet for a closed loop in the overflow box you are going to achieve bubbles from water coming into the overflow box,, even if you do a durso.... does this sound like a possibility here?

Nathan
 
i have 2 1 inch bulkheads & i made 1/4 inch slots on Acrylic it should handle 1200gph.
as for ur closed loop i would just drill the bulkhead to the main tank so u dont have to worry about how much ur GPH the overflow can handle, thats a true closed loop
 
looks cool and should be able to handle that much water flow NP....

Yea,, I agree about the true closed loop.. I really beleive if he puts his inlet in the overflow box he will be adding bubbles into the loop and be rather annoyed by them,,,,
 
Thanks for the replies guys! I may have to rethink my plumbing plans. So, a 12" by 1 1/4" slot shouldn't be a problem and can easily handle 1200GPH? That's perfect.
 
Yeah, I understand that. I'll probably end up drilling a hole for a 2" bulkhead for the closed loop, but I'd still like to hide my overflow drains in an extrnal overflow box if possible. The tank is only 19" wide, so I'm trying to save as much space as possible.
 
understand that,,, I have seen alot of closed loop plumbing in the bottoms of tanks and people hiding them with rocks...

Post some pics once you move forward some more..:)

Nathan
 
i will post a new thread soonest, as i am in the process of setting up a new reef.... i drilled three 3.5 inch long by 1.25 inch tall slots in my newest 140, with glass being .5 thick. it took less than an hour for all three, with the rotozip bit tc-1, 1/8 for tile. awesome..... i will try to post pix to date this weekend..... any questions pm me i will help if i can. i left .5 inch from the top of the glass, and went a lil bit more than .25 under the trim ring. it will look ok when i get the plex slotted cover over the wide slots, and a wave2k will reside over this all, if it allows proper flow.
 
nice post some pictures or a link to ur new thread :beer:
sounds like something i have been doing just at a smaller scale :)
 
It seem as though jury is still out regarding risk involved slotting large tanks in the rear (long) glass. I practiced today on a scrap piece of 3/8 inch glass that I got at the glass shop. The tile bit, a Craftsman "dremel" and a trickling garden hose worked perfectly and fairly quickly. I was planning to slot a 90 aga. I was going to slot the tank toward one end rather than in the middle. I was planning one 10"x1.5" slot or two smaller ones, with the addition of some black acrylic on the inside. Do I read this thread correctly, that such a plan may meet with diaster once the tank is filled with water? Slotting the end is not an option in my situation.

Thanks for any feedback.

Bob (maybe a wier is the way to go in my case)
 
i feel all of the sress is in the lenth and we just had a swam club member do his own holes in his tank on a 210 gal tank and it cracked on the side !
 
im still nervous about doing this on a larger tank. Like john said . a 210 cracking isnt a cheap crack.....Id be leary on doing this on tanks over 90 gallon because of the added pressure of the weight.

Nathan
 
that sucks !
i think as long as u curve the corners of the slot u make it shoulnt matter, if u do staight in to an "L" shape cut u are making the slot week & the presure point is going to be the corner but if u round them just a bit it will not have a week point JME.
john boy did ur friend crack the tank while cutting it or after he made a box & filled with water?
 
I cut a 2.5" hole in my 125. I'll post some pics of it if you want. I also drilled out a hole in a 29. The larger tanks with the thicker glass are much harder and take longer to drill. Hours vs. 20 minutes. I was only worried about cracking on the 29. The glass on the 125 was so thick I was never concerned that it may crack.
 
Great.... You know I never thought of that. But I'm sure the next time I have to drill glass, it'll be the first thing on my mind.

I'll also have a flak jacket and a safety shield. :)
 
I think I would go ahead and buy a hole saw designed for that in those higher thickness's... I drilled my 20 long with a dremel but was advised NOT to spin dremel at 30,000 more like half that ,,
 
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