Davey_8313;1086906; said:
Post #7 of this thread. There's a link.
I think I'll do a separate post of how to determine the size of the window for a plywood tank. And I'll use pictures to explain.
Why not make the tank taller?
- Thread starter AndrewMack
- Start date
Post #7 of this thread. There's a link.
maxumis;1078743; said:
Do you know what the term "safety factor" means? Anything above 1.000 will hold water. That published table of recommended safety factors already has a fudge factor built in - when using glass the engineering standard is to use a SF of 10 or more based on the fracture strength because of it's sensitivity to surface damage.
General rule of thumb: 24" requires 1/2" glass. 3/8 will probably hold water for a while, but if you get a chip or a scratch, kiss your tank goodbye. My window is 30" and I used 5/8. Shop around for glass, if you can find someone who knows someone, you can get a decent price - my 5/8 was $15/sqft.
cvermeulen;1087761; said:
Have you ever seen a tank built with 1 as a safety factor?
My replies here are based on the formulas and calculations as set out in this article.
I'm just trying to make every ones lifes a little easier by giving calculated answers. I went through the effort of running AndrewMacks dimmentions and requirments through the calulations as set out in the linked article.
Tell me cvermeulen what did you do before commenting on my post?
BTW, if you get a chip in 1/2" glass under 24" of water presure you can kiss your tank goodbye any way.
maxumis;1087304; said:
Thank you and a thread to determine the size would be good for a lot of people probably,
maxumis;1087988; said:
Holy crap guy, chill out... I didn't think I was that rude.
Couple things:
What did I do before commenting? About 5 years of engineering studies.
That article doesn't contain a lengthy explanation of safety factor, so I can only assume you've based your S.F. Lecture on... I'm drawing a blank. I'm also drawing a blank on what you've based your assertation that 1/2" glass will explode if you chip it under 24" of water, too. Do you have a link that almost, but doesn't quite support that claim as well?
You said the minumum factor of safety needed to barely hold water was 1.8... are you telling me I was wrong to try to undo your misinformation?
I wouldn't build a tank with a SF of 1, nor would anyone with any sense, but it would hold water if you did... until you sneezed. Yes you were helpful, here's your pat on the back, everyone appreciates it, but if you're going to post information on a public forum, no matter how good your intentions are, you might want to learn to deal with it being critiqued or corrected.PEACE
I am knew to all this, but my guess would be with the increase in height it will consequently raise the pressure exponentially. i.e. the taller the water colloum the more gravity forces down upon the water surface. It migh be neglible, however, you might want to keep wet dry vac handy. (height increase pressure, not surface volume.
I am knew to all this, but my guess would be with the increase in height it will consequently raise the pressure exponentially. i.e. the taller the water colloum the more gravity forces down upon the water surface. It migh be neglible, however, you might want to keep wet dry vac handy. (height increase pressure, not surface volume.
