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11/30/2013, 03:40 PM | #26 |
hmmmmmm
Join Date: Jan 2009
Location: NW Mesa, AZ
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I measured the glass on my Aqueons. The 20l is 5mm just like my rimless is. Being that the 20l is also 12" in height it should not bow enough to be visible without a straight edge placed to the glass. My 40br glass is 6mm yet has bow that is visible without the need for a straight edge. When a straight edge is placed on it vs the rimless there is a big difference in the gap after the center of the bow and the straight edge with the 40br that has a rim having almost 3 times the gap.
I don't know about you guys but that makes me really question how much strength the rim is really giving to the tank. |
12/01/2013, 09:38 AM | #27 | |
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I have been poking around the web to try to understand the safety factor calculation and what it means. Things often get repeated and misquoted without understanding the implications. I did not know that bit about 3.8 = for metal rim and had not seen that posted anywhere. A few more questions if I may... Why does the safety factor required for the glass increase with the use of a Eurobrace vs plastic rim? Structurally, the glass Eurobrace should provide far more rigidity than any plastic rim. How is the width of a Eurobrace calculated? I would think that the principles behind this brace would be similar to structural rigidity in an I beam. I would also think that the width of a Eurobrace is affected by the span it needs to cover as that would affect the compression forces applied to the brace, but that does not seem to come into play for tanks I have seen.
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12/01/2013, 04:04 PM | #28 | |
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12/01/2013, 10:35 PM | #29 | |
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Safety factor is simply an estimate. If the calculations based on the glass strength and the expected load say it should work with thickness x, you want to use glass thicker than x to accommodate errors in your calculations, variations in the quality/strength of the glass, an extra rock leaning against it, etc. Think of a bridge made of steel. You calculate that it should support 5,000 lbs. Now you're driving a truck that weighs exactly 5,000 lbs. Would you trust driving across it? I hope not! A couple of other definitions: Safety - the likelihood that an adverse outcome will not occur based on known factors/information. Outcome - what actually happens, regardless of precautions that were or were not taken beforehand. Note that the second does not involve the first, and the first is essentially a probability. Nik Wallenda walked across the Grand Canyon on a tightrope. He got across just fine, but would you call it safe? Also note that safety is a judgment call, based on your tolerance of risk as well as the cost of an adverse outcome. I'm not qualified to say what a safe design for a rimless tank is. The best person to do that around here is Uncle, and he's given his advice.
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12/03/2013, 02:46 PM | #30 | |
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Last edited by 7808; 12/03/2013 at 02:51 PM. |
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01/09/2014, 09:11 AM | #31 | |
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Come on now, you a DIY hater or something?
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TJ Burton Current Tank Info: 20 Gallon SPS Reef, 25 Gallon SPS Reef, 8 Gallon Eunice |
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01/09/2014, 10:43 AM | #32 |
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01/09/2014, 01:59 PM | #33 |
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I've seen it done, but do not trust it. If you're really planning on doing it anyway, consider eurobracing.. or leave it alone and make a cool canopy =]
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01/11/2014, 11:50 AM | #34 |
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You are basically fishing for the answer you want to hear. I read a thread just like this the other day that was basically a carbon copy. The guy came back a year later with a follow up that he had to replace the tank because the seam gave out like everyone told him it would.
Just to reiterate the rim on a rimmed tank is a significant portion of it's structure. Removing this will compromise the strength of the tank and will drastically reduce it's life. If nothing else if you do decide to remove the trim please update this thread when it fails to serve as a warning to others! |
01/11/2014, 02:04 PM | #35 | |
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So much bad information here.
Based on exactly what? as above. Quote:
I have a 20 year old 20 gallon that has been rimless for over a decade. The glass looks to be 3/16" thick. I broke the backpane derimming and replaced it with window glass of the same thickness and RTV construction adhaesive. My floors are still dry, fish and corals are healthy. A 20 long is under less pressure than a standard 20 and should be fine. For rim removal I used a razor knife and a 6" drywall knife. I got cocky and rushed the last bit causing a break, go slow and be patient. |
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10/25/2021, 10:00 PM | #36 | |
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