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jamieF

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Reply with quote  #1 
I'm playing in sketchup trying to design a water storage tank that will fit in my given space.    Things get far easier if I flip the banding 2x4's on their edge so that they're 1.5" not 3.5" wide.   I'm aware that this makes them weaker but I don't know how much weaker and I'm not sure just how to work out if they'd be strong enough. 

I've seen people posting nice pictures of tanks showing the stress levels various parts of the tank are under going but I'm not sure how they created those and if that's within reason of something that I could do.

Garage_Hermit

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Reply with quote  #2 
If I read the link right, you divide the strength by a factor of FIVE...

https://answers.yahoo.com/question/index?qid=20070723142431AA4cKNp

G_H

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netttech

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Reply with quote  #3 
Got access to steel angle iron? I would think 1/2" steel angle may suffice depending on the span you are trying to achieve. I have both 2'x4 & a lightweight angle steel. The steel is too lightweight & it bends somewhat, not bad though.

Think you need something more substanial? Is there a Farm supply store near by? Steel Fence Posts.

There's 2 primary designs of steel fence posts. One is designed in t shape  & the other is more of a wide |_| (u) design. I'm guessing the depth on both is at or slightly larger than 1".

On the bottom section of the post, there's usually a flat 4-6"w steel section, that can be beaten off the post. It's there to keep the post from being pushed over in dirt.

Here's a link for the t type post at local farm supply store. $4.35 a piece....pretty cheap, may be cheaper than a 2x4.
http://www.myproship.com/index.aspx?StId=942&ShId=55b8c4c3e77042f29e0b5f00de041e53&tab=13&Qtype=1&sku=6382147

Jeff
Central IL
Solar air & water
jamieF

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Posts: 260
Reply with quote  #4 
ouch following that math that means that  a 6' 2x4 laying on the flat will fail at about  105 lbsl if I did my math right.  That sounds really low though as I'm more then double that and just stood on an 8' 2x4 laying on the flat and although it sure flexed it didn't make any noise and definitely didn't fail.   Of course the tank filled to the brim would hold 234 gallons which is just shy of 2000lbs.... 

I was planning on 3 bands  top,middle and bottom of the tank with the bottom being glued and screwed to the plywood base.  I could always add 1.5 " angle iron on the middle band.  that should really strengthen things.   Still that's a lot of water in the basement if it fails.   I'll keep my eye out for some other plans for 6' long x 3' wide x 32" tall tanks.
Garage_Hermit

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Reply with quote  #5 
I would want to be adding another band, between the bottom and mid - that is where all the stress is.

Any way you could build a masonry wall around it ?

It would make your carpet very wet, if it failed...

G_H

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jamieF

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Reply with quote  #6 
an extra band of 2x4's is something like $12.  I could basically make it solid 3/4" ply wrapped in 2x4's if that's what it took   that just seems excessive.   In this case  gratuitous over kill is likely the smart move and worth a few extra bucks.  Masonry wall won't fit.   The only reason I wanted to go on edge with the 2x4's is the space.   
Garage_Hermit

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Reply with quote  #7 
In which case, if U don't have all that much SPACE, it should perhaps be possible to sprag the tank sides against a wall ?
Or plain build the tank bigger, so no space between IT and surroundings... ?
Maybe a sketch would help us to help !

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
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jamieF

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Posts: 260
Reply with quote  #8 
opt 1.png I'm playing around with location in the laundry room.  The wall to the back with the window is poured concrete and will have rigid foam and then a 2x4 stud wall and drywall on it.  The wall on the right is existing 2x4 and I've notice that it's not pinned to the slab so it swings if I lean on it... I'll do my best to pin it then will drywall it as well.  It's not the strongest construction and I don't want to rely on it to support the tank. The existing water heater is electric 60 gallon and is straight towards the viewer 5 or so feet in front of the tank in the above picture.  sewer and fresh water in is in the small corner box on the left beside the window.

   My preference would be to make the tank a little wider and taller.  Something to the bottom of the window would have been best but drain back requires the lines come in roughly 30" off of the floor so height isn't possible.      Strengthening the tank with 2 more 2x4 bands makes sense and is easy enough to do.

The washer and dryer can easily be stacked/moved but need to make sense in their final placement.    A laundry sink still needs added to the equation and some sort of cabinetry is needed for storage.    If I make the tank nice  it can be used as a counter to fold the clothes on. 

I've also proposed 3 other designs to my wife.  the above one was the preferred but isn't optimal. 
opt2.png  opt3.png  opt4.png 
THis last one is a smaller tank only  160 gallons (likely less it was a rough estimate)    The larger tank above is 234 gallons.    My panel will be 16'x4' or 64 sqft 

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