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# RE: App weight of steel tank

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: App weight of steel tank
• From: "Arvel L. Williams, P.E." <awilliams(--nospam--at)gwsquared.com>
• Date: Fri, 25 Mar 2005 10:06:01 -0600

```Nat,

You tank should be about a 1/2" to 3/4" plate or so.

So, if you a cylinder 90 feet tall thats 1080 inches.  Then your plate is
3392 inches long (Pi x D) that make the plate 1080 x 3392 x 0.5 so that's
1831680 cubic inches.  Plain jane Carbon steel weighs about 0.284 lb/cubic
inch.  So the walls will be on the order of 520,197 lbs.

Now the water will weigh about 62.4 lbs / cubic foot.  Tank volume is PI X
D^2/4 x H so that 572265 cubic feet.  That make the weight of water about
35.7 million lbs.  So the tank wall are 1.5% of the total tank dead weight.

Now for my short hand version of calculating the bearing stress for dead
load on this type of tank.

Take the weight of water x the height of the water column.  That is
equivalent to the volume divided by the area of bearing .

You get 62.4 x 90 = 5616 psf.  So round that to say 5700 psf.

Now you need to look at over turning etc.  But in the full condition, the

Arvel

-----Original Message-----
From: Nat Mohanram [mailto:nattamaim(--nospam--at)yahoo.com]
Sent: Friday, March 25, 2005 8:43 AM
To: seaint(--nospam--at)seaint.org
Subject: App weight of steel tank

Can any one help me to guess approximate weight of
steel tank for storing water , 90 fett dia and 90 ft
tall.
I have to design preliminary foundation.

Thanks

Nat

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