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Old 01-25-2013, 11:01 AM   #1
wilserbrewer
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Out of curiosity, I conducted a simple polyester voile strength test.

The bag, poly voile machine triple stitched w/ tight zig-zag type stitch...

http://biabbags.webs.com/




The weight, 67 lbs of dumbbells, 2 - 20's, 1 - 15, and 2 - 6's...67 lbs total



The strap tied off to the top of the bag, this is an inexpensive HF lashing strap, it works quite well to suspend the bag from a ceiling hook. I prefer this method as it spreads the load over the entire bag, as opposed to stitched handles or attachment points on the bag.

A short length of cord or rope can also be easily wrapped and tied around the top of the bag for lifting and will cinch the bag very well for even heavy duty lifting.


The test, bag took the weight w/ no issues...none whatsoever!



I have done BIAB grain bills close to 40 lbs, and have always surmised the poly voile could handle more weight, I would also imagine the irregular shaped dumbbells put much more stress on a bag than the even loading of a mash. Also interesting to note that I believe a grain bill of x pounds, weighs less than x after conversion and water absorption, so a 20 lb grain bill weighs less than 20 lbs after being lifted out of the kettle.

Myths busted:

1. BIAB is not viable for larger batch brewing.
2. The use of a strainer basket is needed to support the bag.
3. Handles are needed on a BIAB bag for large grain bills.

Thanks for watching this experiment...cheers!

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Old 01-25-2013, 03:00 PM   #2
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Very cool. Well that says weight is no an issue currently for me. Now to double/triple stitch my bag.
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Old 01-25-2013, 03:11 PM   #3
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That's pretty cool.

However, I find it hard to believe that the sugars removed from the grain during the mash weighs more than the water the grain absorbs. It has seemed pretty obvious in my few BIAB batches that the grains weighed more after absorbing water than they did before I dumped them in the kettle.

I might be wrong, but I'd have to see some proof from a scientific test of some sort before believing it. Of course, there is a big difference between the weight as it is lifted from the kettle and after it has drained sufficiently. So, any test of this question would have to be specific about the amount of time for draining before weighing the spent grains.
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Old 01-25-2013, 03:16 PM   #4
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It might weigh less once the bag drains, but when you pull it out of the kettle, it is definitely heavier. That being said, I've done up to 36lbs in my BIAB bag and had zero problems or any fear of it ripping. Even after increasing the stress by twisting the bag 15-20 times to squeeze out the liquid, it held strong.

 
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Old 01-25-2013, 03:43 PM   #5
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Nicely done!

 
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Old 01-25-2013, 03:52 PM   #6
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The bags I have made with poly voile will take some serious abuse. I still use my steamer basket because it's easier for me to drain the bag after mashing.
I also use my BIAB bag in my 10 gallon Igloo mash tun.


 
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Old 01-25-2013, 05:35 PM   #7
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Take 10 pounds of grain at an absorption rate of water at .06. That would equal 0.6 gallons of water. Now take the weight of water to be 8.35 pounds for a gallon. So it would be 0.60 gallons of water * the weight of a gallon of water 8.35 is 5.01. A 40 lb grain bill would add about 20 pounds of wieght.
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Old 01-25-2013, 06:47 PM   #8
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Quote:
Originally Posted by johns View Post
Take 10 pounds of grain at an absorption rate of water at .06. That would equal 0.6 gallons of water. Now take the weight of water to be 8.35 pounds for a gallon. So it would be 0.60 gallons of water * the weight of a gallon of water 8.35 is 5.01. A 40 lb grain bill would add about 20 pounds of wieght.
This is true above, if you have not extracted ANY sugars from the grain???: That doesn't come free

Boy, you conduct a little science experiment around here and all the geeks come out of the closet...hahaha

 
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Old 01-25-2013, 08:18 PM   #9
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So I just wanted to chime in, because i figured the weight of the sugars would actually be insignificant, but after looking at the numbers, its pretty substantial. At least if I understand things correctly.

2 row is roughly 1.038 points per gallon per pound, table sugar is 1.046 per gallon per pound, so that means 2 row is approx 83% sugar right? Thats really interesting to me, because the grain probably is significantly lighter after conversion then before. I'll have to bust out my scale and to look and measure, including tracking of grain absorption of water, next time I brew. Fun stuff!

Edit: I am scatterbrained, clarified some wording...

 
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Old 01-26-2013, 05:17 PM   #10
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DING DING - ROUND TWO

Well for kicks and curiosity, we stepped it up and conducted round two.

The weight...120 lbs...



The ratchet strap...



The lift...



No issues at all, not even a stretched seam. This is the upper limit, the bag is nearly full of steel at this point...haha. Cheers and hope you enjoyed this silly experiment...

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