largest possible rimless all glass tank - The Planted Tank Forum
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post #1 of 23 (permalink) Old 02-03-2009, 11:34 AM Thread Starter
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largest possible rimless all glass tank

Im planning to build a tank that will be 200cm long, about 6'6" and 55cm tall, 22". It will be an open tank and most of all I whant to have it ADA style with no braces. Its been recomennded to me to have glass beams siliconed to the top of the long sides of the tank to stop the glass from bending under the pressure of the water.

My question is; is the tank to big to be built without these supports? How thick glass would I need to be able to build a tank this size without supports?

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post #2 of 23 (permalink) Old 02-03-2009, 12:39 PM
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It all comes down to the thickness of the glass and the silicone being used as the adhesive.


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post #3 of 23 (permalink) Old 02-03-2009, 12:52 PM Thread Starter
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So, how thick would the glass have to be.
Are there any extra strong types of silicone that you could recommend?

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post #4 of 23 (permalink) Old 02-03-2009, 01:00 PM
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for that length I would say a minimum of 1" thick glass may have to go thicker even. Tank empty will weigh a ton.

That's alot of span to keep from bowing.

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post #5 of 23 (permalink) Old 02-03-2009, 01:04 PM
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There are calculators around on this site somewhere. I would reccomend contacting a company that builds them honestly.


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post #6 of 23 (permalink) Old 02-03-2009, 03:20 PM
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Check out Eurobracing, it may be a good compromise...
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post #7 of 23 (permalink) Old 02-03-2009, 04:19 PM Thread Starter
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AAhh, that is what had been recommended to me, just didnt know it was called eurobracing. here they usually only put the glass strips on the length of the front and back, but not the sides.
If I'd eurobrace its been recommended to me to use 12mm glass. So without eurobracing, 14mm? 16mm?

How about the bottom, should it generally be thicker then the sides?

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post #8 of 23 (permalink) Old 02-03-2009, 05:12 PM
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I just put these dimensions into a rimless aquarium glass calculator(aqua-calc)
80" long 24" wide 22" tall and this is what it reccomends
minimum side and front glass 11.30mm with min side deflection 0.36mm
minimum bottom thickness 15.70mm with min bottom deflection 0.27mm
desired saftey factor of 3.8 or higher is whhat they reccomend so I would use 3/4" glass at least
Scolley has a link for aquacalc in his stickey at the top of the page you have to use jave to download it
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post #9 of 23 (permalink) Old 02-03-2009, 05:50 PM
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just use 1" or 1.5" glass...then you know you're good
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post #10 of 23 (permalink) Old 02-03-2009, 07:14 PM
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Quote:
Originally Posted by Sven View Post
Im planning to build a tank that will be 200cm long, about 6'6" and 55cm tall, 22". It will be an open tank and most of all I whant to have it ADA style with no braces. Its been recomennded to me to have glass beams siliconed to the top of the long sides of the tank to stop the glass from bending under the pressure of the water.

My question is; is the tank to big to be built without these supports? How thick glass would I need to be able to build a tank this size without supports?
3/4" is a min I'd use.
If you have over glue on the edges, you will also gain some strength, but it will not look as nice as some tanks that have the the no edge trim on th silicone seams. Trade off there.

6.5 ft x 22 tall is not much different than a typical 180 like I have.
Height adds a lot more stress to the bond.
Special silicone glues and all that, that's baloney, do not fall for any mumbo there. They are just pulling your leg.

This is going to be a very heavy tank, 4-5 people and some Glass moving suction disc(4 or so) will be needed.

3/4" will not bow, nor is that a huge issue at this thickness either.
even with a laser level, I cannot detect any bow on 3/4" over 6ft distance.

1" is extremely heavy.
It's over kill, but you might consider having that made on site.

This is my tank which is close to what you are after, it's 3/4" or 19mm.



ADA's is thinner than this and the silicone is cut to the edge, looks prettier, but...........you lose about 2-4mm of glue surface and no amount of special glue can make up for that area.

A few corner bracings or Euro style might be an added safety feature for you, but I'd not go more than 3/4" really.

12mm is out of the question.
16mm is also rather thin IME.
Go 18-20mm range. The bracing is more for insurance.

If you do 20mm and do not trim the silicone to the absolute corner, then you likely will not ever need euro bracing of any type.

Just make sure you never move the tank again


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Tom Barr

Regards,
Tom Barr




Regards,
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post #11 of 23 (permalink) Old 02-06-2009, 06:44 PM
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Tom, Does that tank have polished edges?^^^
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post #12 of 23 (permalink) Old 02-06-2009, 07:27 PM
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Edward from ReefCentral used to have a 300gallon Starphire tank thats 19mm

The dimensions were 72Lx40Wx24H, so it's a little shorter then yours but it's taller, and most likely going to be more in depth, so you should be fine ALTHOUGH, I think he had his starphire tempered
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post #13 of 23 (permalink) Old 02-08-2009, 09:28 PM Thread Starter
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Well the glass supplyer here can order 19mm glass for me and so I'll be going for that.

Another thing I've been worrying about is jumpers, and that's actually the only thing I worry about with an open tank, and I don't want to put anything on top of the tank or edges to keep the fish in. Although I don't plan on getting any famous jumpers, I'd like to stay on the safe side. How far from the edge of the glass does the water surface need to be in order to be pretty safe?

Also, is the risk of jumpers less in taller tanks?

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600 ltr (160g) planted tank. Pressurized CO2, Eheim 2260 & Sacem Marathon 2000, 156W T5.
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post #14 of 23 (permalink) Old 02-09-2009, 07:35 PM Thread Starter
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bump

Eheim pimp #127.
600 ltr (160g) planted tank. Pressurized CO2, Eheim 2260 & Sacem Marathon 2000, 156W T5.
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post #15 of 23 (permalink) Old 02-09-2009, 08:23 PM
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the risk of jumpers is less if you cover the tank for the first few days you have the tank. apparently, the fish try to jump a few times, and get used to not being able to. Other than that, if fish are chasing each other out of the tank, you'll never be safe ;-)
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