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	FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
		Digest Janitor: pbabcock at hbd.org


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Contents:
  Re: Mash tun size? ("Craig S. Cottingham")
  Mash tun size (Thomas Rohner)
  Re: Mash tun size? (donniestyle)


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Date: Tue, 16 Jun 2009 00:43:53 -0500
From: "Craig S. Cottingham" <craig.cottingham at gmail.com>
Subject: Re: Mash tun size?

On Jun 15, 2009, at 12:02, drsmith <hbd at aperature.org> wrote:

> The question on my mind lately is how much grain and water fits in a
> 10 gallon space.  I already have a 10 gallon cooler that could be used
> for a simple infusion mash, but I'm uncertain if I can hit a 1.060
> gravity with it if I'm attempting a 10 gallon batch size.

I have a 5 gallon cylindrical cooler I use as a mash tun, and I once  
got 14.5 lbs of grain into it and 5 gallons of 1.077 gravity wort  
out. There are too many variables to tell if your mileage will be the  
same, but generally speaking, yes, what you want to accomplish should  
be feasible.

- --
Craig S. Cottingham
craig.cottingham at gmail.com
+1 (913) 826-6896 or Skype me at CraigCottingham
OpenPGP fingerprint: 7977F79C



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Date: Tue, 16 Jun 2009 08:04:54 +0200
From: Thomas Rohner <t.rohner at bluewin.ch>
Subject: Mash tun size

If your mash tun equals your batch size, you are ok up to around 17P 
(around 1.068). For higher gravities, you can mash twice and only take 
the first runoff, or reduce the batch size.
The boiler shoud be 30-50 percent larger than your batch size. 
(evaporation and boilovers)
We intend to step up from 50 to 100 litres in the near future. (our 50 l 
3 tier keg setup made some 250-300 batches over the last 10 years)
We already have 3 wonderful 100 litre containers and we intend to 
enlarge the mash tun by 20 and the boiler by 50 percent. The mash tun 
gets enlarged, because it gets pretty full at higher gravities and we 
intend to add a electric mash mixer.

Since you intend to do infusions in a non heated cooler, you may need 
more volume to reach the mash out temp. Or at least, you need to mash in 
pretty "dry". Our mash tun is heatable, so we don't need to add water 
until lautering. We wanted to do step mashes and be able to start at low 
temps.

Maybe you get responses from "cooler mashers" as well. The picture may 
be a bit different there.

Cheers Thomas


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Date: Tue, 16 Jun 2009 11:07:29 -0500 (CDT)
From: donniestyle at directlink.net
Subject: Re: Mash tun size?

> Subject: Mash tun size?

Searching HBD you can find information on calculating the mass of the
mash.  The formula I use was posted by Ken Eddy.  Here it is.

Total volume of mash = Wg (0.08 + MWR/4) gallons
                     = Mg (0.67 + MMWR) liters

Wg  = weight of grain (lbs)
MWR = Mash Water Ratio, qt/lb
Mg  = Mass of grain (kg)
MMWR = Metric Mash Water Ratio, liters/kg

One thing I found is it does not account for what is taken up for the
false bottom.  Another thing that I found is other formulas used to
calculate the amount of infusion water to raise the mash temperature fall
short of what is actually needed.

For example, if I use 30 pounds of grain, and I use 0.8 qt per lb:
Wg = 30 * (0.8/4 + 0.08) = 8.4 gallons.



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