DIY Mash Caps

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Bilsch
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Re: DIY Mash Caps

Postby Bilsch » Sun Nov 27, 2016 4:42 am

That's a nice looking cap Nate !
The diffuser is a great idea.
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Weizenberg
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Re: RE: Re: DIY Mash Caps

Postby Weizenberg » Sun Nov 27, 2016 4:54 am

Natebriscoe wrote:I have seen these before with wine variable capacity tanks. Don't know that I have seen any VC tanks very close to homebrew kettle sizes though.


The available range is from 360mm to 1000mm. It may not fit a 30l mash tun, but for 50l upwards there should be no problem.
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adam
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Re: DIY Mash Caps

Postby adam » Fri Dec 02, 2016 9:27 pm

Who is going to run the test with their mash cap and DO meter ?

Experiments:
DO absorbed without mash cap
DO absorbed with mash cap - tight fit
DO absorbed with mash cap - loose fit (X cm from edge)

I was looking at heavy duty aluminum foil (2 layers) covering a foam board for mine. But if not needed...
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Bilsch
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Re: DIY Mash Caps

Postby Bilsch » Sat Dec 03, 2016 9:05 am

Since every batch of beer is precious to its brewer.. chances are if one has already made a mash cap, it won't get left off for the sake of a DO experiment. Sadly your probably on your own to do the experiment.
Natebriscoe
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Re: DIY Mash Caps

Postby Natebriscoe » Sat Dec 03, 2016 10:44 am

I don't have a do meter, so I can't. But couldn't this experiment be done with just water and smb? It probably wouldn't be perfectly inline with a mash, but the losses should be about the same. Right?
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Bilsch
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Re: DIY Mash Caps

Postby Bilsch » Sun Dec 04, 2016 3:15 pm

Probably not since their are other antioxidants in the mash besides the added smb. My attitude is the mashcap is relatively easy and cheap to make/procure so why not just do it.
Techbrau
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Re: DIY Mash Caps

Postby Techbrau » Sun Dec 04, 2016 4:28 pm

Depends on way too many variables, e.g. Kettle shape, mashing time, recirc or not, how much you stir, how much said stirring or recirculation disturbs the liquid surface, etc. Each of these things could change the DO ingress of an uncapped mash by a factor of 2-3 or more.

A floating mash cap is such a simple, easy, and cheap modification which will cut down the diffusion rate of oxygen into the mash by 95% or more. That's putting the surface area to volume ratio of a 5 gallon homebrew system in line with a pro 1000 hl system. There is absolutely no reason not to use one, because it allows you to significantly reduce your SMB dose without any anxiety and costs no more than a couple dollars.
If you always do what you've always done, then you'll always get what you've always gotten.
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Weizenberg
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Re: DIY Mash Caps

Postby Weizenberg » Sun Dec 04, 2016 7:29 pm

I think you need more than a DO meter to test this. One might have some success with an optical Do meter, but these are in 5 figures. One could measure the sulfites used up -- which is what Narziss did.

For what it's worth, in our humble world of brewing amateurs an experiment like this would be very interesting, but beyond our scope and lof imited benefit. For what it's worth, the insurance is so easy to implement that it is not worth the expense.

If someone would step up though, then that'll be mighty interesting!

Best
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bjanat
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Re: DIY Mash Caps

Postby bjanat » Thu Jan 26, 2017 3:08 pm

Ghetto system, thought of using the sterile siphon cane from the pump hole in the 10 liter Speidel up through a styrofoam cap and down through another cap in the fermentation bucket. The tip of the cane is sealed with a rubber thing that us used for airlocks.

Looks like crap, but might be a tight system, avoids dripping, and overcomes the OG limitations of the Speidel.
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bjanat
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Re: DIY Mash Caps

Postby bjanat » Thu Jan 26, 2017 4:42 pm

And, I'll be using a mash agitator made with a hand drill and a trivet from Ikea, slightly bent. This should improve efficiency and circulation.
https://www.amazon.com/Schroeder-Hand-D ... 441&sr=1-1
http://m.ikea.com/us/en/catalog/products/art/30111087/

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