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Old 06-28-2011, 07:50 PM   #1
Gropo
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Aug 2010
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How the fark am I loosing 30 degrees to the tun?? According to promash, for my 8.5 lbs of grain my strike water should be around 168, which it was. After dough-in my grain bed was at about 135. I've added 2 quarts of boiling water and I'm at 138. Do I keep adding water?? This is a Scottish BTW

 
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Old 06-28-2011, 07:55 PM   #2
cercueil
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What the hell are you using for a mash tun? Liquid Nitrogen?
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Old 06-28-2011, 07:58 PM   #3
Gropo
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It's a hand-me-down 20 gallon plastic tun, which sits in an insulated plywood box. Maybe the dense foam insulation is pulling the heat out?? Anyway, should I keep adding water to try and rescue this, or consider it a lost cause?

 
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Old 06-28-2011, 08:00 PM   #4
Golddiggie
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Was the grain, and mash tun, in thr fridge/freezer and not have time to warm up? What's the temps where you are? What are you using for a mash tun (as already asked)?

I think you need to figure out why you got such a large temp drop. You could pull some of the wort/mash and heat it to get your temp. I would verify the thermometer readings first though. What are you using for a thermometer?
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Old 06-28-2011, 08:00 PM   #5
cercueil
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I would try and get it till about 148 if you can. Mash for at least an hour or maybe more. The lower the mash temp the longer you have to mash for.
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Old 06-28-2011, 08:00 PM   #6
cabal09
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Did you pre heat the mash tun?
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Old 06-28-2011, 08:02 PM   #7
cravej
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Is the thermometer accurate?

 
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Old 06-28-2011, 08:05 PM   #8
Gropo
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Leavenworth WA
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I calibrated my digital thermometer before brewing. Grain and tun were at ambient temps...about 67 - 68. I'm stumped. Will I get any kind of conversion at all with mash temps this low???...I'm approaching 6 gallons of water in the mash right now. FUBAR

 
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Old 06-28-2011, 08:20 PM   #9
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Do a Decoction ... Here is a calculation:
to determine the amount to extract:
((D-T) * (G * (0.3125+R) / (212-T))
Where
D = Desired Temperature of mash after decoction is added back in
T = Current temperature of mash
G = Total Grain in LB
R = Ratio of Quarts of water per pound of grain
212 is the Temp in F of the decoction.
0.3125 is the consistent approximate of the mashes capacity to absorb heat.
This will tell how much to extract from the Mash Tun.
You bring the extract to 150 to 153 F and rest 10 minutes. Then bring the extract to a boil and boil for 10 minutes. Then add it back to the total mash to bring you to the next rest.
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Old 06-28-2011, 08:25 PM   #10
iaefebs
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After you save this batch...... next time...... pre heat the mash tun....

 
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