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Old 05-10-2012, 03:56 PM   #1
ebstauffer
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I've been assembling various and sundry pieces and parts for my single tier brewstand. I'd buy it all at once but Im counting on individual purchases passing below the radar of the household ways & means committee.

That being said, one of the bigger purchases is the metal for the stand itself. Im going with 304 square stainless tubing. Many of the stands I've seen use 10 guage 2"x2" (approx 1/8"). My local metal shop charges about $15 / foot for this stuff. Im thinking it might be overkill.

My question is simple: what is the appropriate size tubing for this job? My weight assumptions are:

wort/water: 9 lbs / gallon
kegs : 30 lbs
fitting: 40 lbs

If the kegs are filled to capactity we're looking at 420 lbs so let's add another 35 for grain the grand total is 578 lbs. Add 10% for safe measure and we right around 620 lbs. My highly technical drawing is below:



Couple of good reads:

Deflection Study
[URL="http://www.steeltubeinstitute.org/pdf/brochures/dimension_brochure.pdf"] Hollow Structural Sections Dimensions and Section
Deflection Calculator

which cover tubing strengths. I cant see where 1.25" sq tubing w/ 11 guage wall thickness wouldnt be more than enough. Thoughts?


Edit: added link to deflection calc.

 
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Old 05-10-2012, 04:31 PM   #2
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An engineer that's ALSO a home brewer? Good luck with that!
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Old 05-10-2012, 04:34 PM   #3
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Over-engineering a project? Where is the thrill?

 
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Old 05-10-2012, 04:40 PM   #4
audger
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your question depends entirely on the actual construction of the stand. there are situations where a stand made from 2" square stainless tubing would collapse, but a stand made from less robust individual materials, but assembled better, would hold a truck.

Quote:
I cant see where 1.25" sq tubing w/ 11 guage wall thickness wouldnt be more than enough.
that is probably more than enough, if properly assembled (with supports/braces where needed; welded or securely fastened...).

 
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Old 05-10-2012, 04:46 PM   #5
mattd2
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As a thumb suck based on your sketch I'd say no problems.
By the way there are a few of us engineers on here http://www.homebrewtalk.com/f14/what...gineer-135492/
If you were worried just cut 2 more verticles and have 2 centre supports on each long side.

 
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Old 05-10-2012, 06:25 PM   #6
conpewter
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If you need to do this on the cheap I'd look on craigslist for free bed-frames and weld those together, plenty strong (but somewhat hard to work with).
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Old 05-10-2012, 07:44 PM   #7
pigroaster
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They are only hard to work with if you do not get person out of bed. Paint should be ground off in weld areas!! I use 6011 electrodes!

 
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Old 05-10-2012, 08:53 PM   #8
Bobby_M
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2" square @ 1/8" wall is overkill in any situation under 50 gallon vessels.
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Old 05-10-2012, 09:04 PM   #9
KitB
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I'm not an engineer, but I am a mechanical designer with a structural background.
2x2x1/8 is definitely overkill.
You can get away with 1.25x1.25x11 ga.

I'm tempted to model it up & do FEA, but I don't have that kind of time.

 
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Old 05-10-2012, 09:12 PM   #10
outside92129
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i used 1x1x1/8 angle iron (which is 1/2 of tube) and it holds up great, even with a full 10gal HLT, full MLT, and 12gal BK. I do have some vertical flat bar but it's going to be significantly cheaper if you went smaller.

1x1x1/8 of angle iron is almost the same weight (per foot) of 1x1x16ga tube.

 
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