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-   -   Is there an engineer in the house? (http://www.homebrewtalk.com/f51/there-engineer-house-327689/)

ebstauffer 05-10-2012 03:56 PM

Is there an engineer in the house?
 
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:

http://pics.sugarcreekspirits.com/brewstand.png

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.

TopherM 05-10-2012 04:31 PM

An engineer that's ALSO a home brewer? Good luck with that! :cross:

Homercidal 05-10-2012 04:34 PM

Over-engineering a project? Where is the thrill?

audger 05-10-2012 04:40 PM

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...).

mattd2 05-10-2012 04:46 PM

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.

conpewter 05-10-2012 06:25 PM

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).

pigroaster 05-10-2012 07:44 PM

bed frames
 
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!

Bobby_M 05-10-2012 08:53 PM

2" square @ 1/8" wall is overkill in any situation under 50 gallon vessels.

KitB 05-10-2012 09:04 PM

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.

outside92129 05-10-2012 09:12 PM

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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