glass thickness is enough?
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Old 06-25-2013, 02:44 AM   #1
yanzco
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glass thickness is enough?


hi guys, im filling up my tank now for a full leak test..
but noticed a tiny tiny bending..

glass length is 56inch
tank width is 24inch
height of glass is 22 inch
depth would be 21 inch

glass thickness is 12mm..
total water = 100gal

is this enough.. i have 2 braces, but located on the far opposite ends to support the silicone and prevent tearing..

but, if i would go brace less tank .. is that thickness enough ? 21 inch depth..

rivermud calculator says if i had 12mm, i have 4.5 safety factor.. with 22 inch depth
and 5.0 safety factor with 21 inch depth

with 0.25 mm deflection...

or the bending i saw right now is just my eyes playing tricks with me..
or me just being nervous breaking the glass i spent so much.. hahaha.. :O
currently its on 18n inch depth

anyway, if any of you guys can tell me its safe, then ill proceed going for the max depth 21inch i planned..

Last edited by yanzco; 06-25-2013 at 02:58 AM.. Reason: added info
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Old 06-25-2013, 05:33 AM   #2
thelub
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I've seen more flex without issue. You'll get that much deflection under a plastic frame you just dont see it because of the frame. As long as it stays at that small of a bow I'd say you're fine.
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Old 06-25-2013, 07:03 AM   #3
yanzco
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i see... whew thanks!.. i thought id be needing to put the middle brace, but i need that space so i could crawl inside the tank..

but for now.. i drained the tank, i got some minor pinhole leak @17inch mark .. ill be re-sealing it just now after i hit reply
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Old 06-25-2013, 07:29 AM   #4
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Have you considered a euro brace? A bottom euro brace at least would add some peace of mind.
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Old 06-25-2013, 09:57 AM   #5
yanzco
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at the bottom?.. if its to prevent the glass from being pushed outward, its already taken care by 1x1 3mm thick steel angle bar..

unless it is to prevent the glass from sliding towards the inside..
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Old 06-25-2013, 06:17 PM   #6
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No, the lower euro brace is to add an extra thickness on the bottom to reduce stress on the bottom seal from water pressure pushing out.
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Old 06-26-2013, 01:51 AM   #7
yanzco
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aah i see.. i think the steel angle bar i placed is doing a good job supporting the glass panes..
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