i would say 12mm would be more than enough but wouldnt go any thinner that way you have a good safety factor
Can you tell what it is yet? Construction has started!
- Thread starter Satan's Goldfish
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No, you go with the 9x3Satan's Goldfish;3511407; said:
Remember, there is still just as much water behind it ! ! !
a 2x3 tank has 1/4 the water & 1/4 the weight, you need to use specs on 9x3 (IMHO)
My idea of seperate panes=thinner thickness requirements comes for the mighty arapaimag and his 50,000gal temple of worship. His windows are 3' wide, go down to a depth of 5', and are 25mm thick. At a depth of 5ft that glass is holding back 30,000gal (ish, it's 9' deep in total) but can get away with 25mm thick glass as it's only 3' wide. At 1,000 gal and 3' depth, my glass would only have to hold 1/30th of that pressure and each pane is only 2' wide.
I'm not a structural engineer or glass specialist (hence the question,) but with the design i'm planning on using the pressure of the water will be held back by the strength of the wooden frame around it and the glass will only be holding the pressure placed on itself by the volume of water and will provide nothing structural to the overall design. The other way to think of it is trying to imagine that across the well supported 9'x3' front i only fit one 2'x3' window and leave the rest as ply and 2x4 like the rest of the pond. Would that single 2'x3' window really need to be as thick as a 9'x3' window? (the water pressure at that point is spread evenly across the entire pond, not focusing itself on that 2' stretch of glass.)
In my head (it's a messed up place, you don't wanna spend too much time there!) it seems to me that if you had a framed pane of glass with a large and increasing pressure on one side then the weakest point is going to be the center of the pane where it's most likely to start bowing out and then break as it's furthest from the support of the frame. So if a supporting brace was placed across the center of the pane then that would provide it with more support and allow it to withstand a higher pressure before breaking.
Or am i just talking out my ars* about the whole thing?
9'x3' pane would be nice but is prohibitivley expensive.
I'm not a structural engineer or glass specialist (hence the question,) but with the design i'm planning on using the pressure of the water will be held back by the strength of the wooden frame around it and the glass will only be holding the pressure placed on itself by the volume of water and will provide nothing structural to the overall design. The other way to think of it is trying to imagine that across the well supported 9'x3' front i only fit one 2'x3' window and leave the rest as ply and 2x4 like the rest of the pond. Would that single 2'x3' window really need to be as thick as a 9'x3' window? (the water pressure at that point is spread evenly across the entire pond, not focusing itself on that 2' stretch of glass.)
In my head (it's a messed up place, you don't wanna spend too much time there!) it seems to me that if you had a framed pane of glass with a large and increasing pressure on one side then the weakest point is going to be the center of the pane where it's most likely to start bowing out and then break as it's furthest from the support of the frame. So if a supporting brace was placed across the center of the pane then that would provide it with more support and allow it to withstand a higher pressure before breaking.
Or am i just talking out my ars* about the whole thing?
9'x3' pane would be nice but is prohibitivley expensive.
Or, another way to look at it, put a pressure/depth gauge at the bottom of a 2'x2'x3'deep tank and it will read the pressure/depth as being 3'. If you put it at the bottom of a 5'x9'x3'deep it will also read a pressure/depth reading of 3'. So the glass at 3' in a 2'x2' (12mm) is coping with the same amount pressure as the glass at 3' in a 9'x5'.
Satan's Goldfish;3512305; said:
I mean 'Volume', not pressure.
Bump! Searching for a glass boffin/someone to tell if i'm talking b*ll*cks! Feel free to use geeky scientific terms, i can handle it, and it means i can get away with writing posts with similar language that mrs satan will give up trying to read and understand!
If using an all glass calc. The height is from the lowest unsupported part of glass to the waterline. Width is form the glass to the back wall and length is the width of each Panel.Satan's Goldfish;3511407; said:
If it was a full panel you would need 15-19mm. Split into 4, 12mm should be fine provided the support frame around it is sound. At the smaller size the cross sectional pressure is greatly reduced. In saying that, I still suggest the full panel. I know it will be a massive cost difference but you will be so glad you laid out the extra when you are looking through it with an unobstructed view.At one time I was thinking about 2 panels on my build but I am so happy now I went with the full piece.
Looking forward to seeing this build progress.
Thanks for the confirmation. was going to look at 20mm if i went 9x3 so will get quote for that and the 2x3 at 12mm and make decision based on that.greenterra;3512880; said:If using an all glass calc. The height is from the lowest unsupported part of glass to the waterline. Width is form the glass to the back wall and length is the width of each Panel.
If it was a full panel you would need 15-19mm. Split into 4, 12mm should be fine provided the support frame around it is sound. At the smaller size the cross sectional pressure is greatly reduced. In saying that, I still suggest the full panel. I know it will be a massive cost difference but you will be so glad you laid out the extra when you are looking through it with an unobstructed view.At one time I was thinking about 2 panels on my build but I am so happy now I went with the full piece.
Looking forward to seeing this build progress.
The other issue (other than cost) i'd have with a 9x3 at 20mm thick would be actually carrying it and getting it into where the pond is. Small panes i can do on my own with less risk of an expensive pile of glass on the floor and me crying like a little girl in the corner.
Congratulations huni, you're no longer a noob!MRS SATAN;3514097; said:
(Can i have more Pacu for Christmas?)
