Pharaoh;3882234; said:1/4" glass would work with tons of bracing, but I would strongly recommend using 3/8" glass
You would need;
For 1/4"
1 - 72" x 24"
2 - 72" x 17 3/4"
2 - 23 1/2" x 17 3/4"
for 3/8"
1 - 72" x 24"
2 - 72" x 17 5/8"
2 - 23 1/4" x 17 5/8"
Pharaoh's measurements are spot on... so is his reccomended thickness If the tank is going to be completly filled to the top.
It really depends on what the constant water level in the sump will be at all times... If your running a wet/dry, you'll only have about 6" of continuous water in that tank... 6mm can handle that with ease. even when the power cuts out, or your doing a water change, your probely only going to get an additional 6" of water drained to the sump(depending on overflow) so that would be 12" of water, which 6mm could also handle...
So depending on what type of sump your doing, and what your water level is going to be at all times, and during a power outage, that is what is going to depict the glass thickness your going to need.. not just the over all heigth of the tank since its not a fish tank.. What design are you going with.
The measurements Pharaoh provided are also good if you want the tanks total heigth to be 18"... if you want the tank internal heigth to be 18"... then use the following..
For 1/4"
1 - 72" x 24"
2 - 72" x 18"
2 - 23 1/2" x 18"
for 3/8"
1 - 72" x 24"
2 - 72" x 18"
2 - 23 1/4" x 18"
This also makes for an easier cutting list. Thats usually how i get mine cut. I dont calculate in the bottom pane, when determining heigth.. This way also gives you more water volume and is going to cost the same. At the same time, it doesnt make the required thickness go up.