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Old 02-15-2013, 12:56 PM   #1
mezhan
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Default Replacing grain with extract - conversion help

Hey all,

So I've read that when you replace malted grain with extract, there is a pound to pound conversion. The numbers I've read at .65 for DME and .75 for LME (can anyone vouch for these?) but my question is do I need to use a multiplier for tun efficiency?

For example, I would add 7 lbs to my tun but the efficiency is only 0.85. Do I take 7*0.85 then multiply it by 0.65 if I want to get pounds of LME? I assumed the extracts are 100% efficiency.

Thanks!


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Old 02-15-2013, 01:08 PM   #2
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potential gravity of ---
2-row: 1.036
LME: 1.038
DME: 1.042

36 * 0.70 mash efficiency = 25.2
25.2 / 38 = 0.66
25.2 / 42= 0.60

therefore if an all grain recipe assumes 70% efficiency, your ratio would be 0.66 pounds of liquid extract per pound of grain or 0.6 pounds of dry extract per pound of grain.

in a high-efficiency example, like your 85% example, the ratio would be
36* 0.85 = 30.6
30.6 / 38 = 0.81
30.6 / 42 = 0.73

therefore with 85% mash efficiency, your ratio would be 0.81 pounds of LME per pound of grain or 0.73 pounds of DME per pound of grain.

helpful chart - http://www.homebrewtalk.com/wiki/index.php/Malts_Chart

-------
the "short" answer is that the "typical" conversions you see assume an efficiency in the 68-75% range.


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Old 02-15-2013, 01:19 PM   #3
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Quote:
Originally Posted by progmac View Post
...redacted, recalculating
haha, well my thought is that those conversion numbers must be somewhat accurate otherwise you'd hear peoples OGs and FGs turned out different than they expected.

I suspect it would be a per brewer calculation, as depending on your tun and method you will result in different efficiencies.
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Old 02-15-2013, 01:24 PM   #4
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Quote:
Originally Posted by mezhan View Post
haha, well my thought is that those conversion numbers must be somewhat accurate otherwise you'd hear peoples OGs and FGs turned out different than they expected.

I suspect it would be a per brewer calculation, as depending on your tun and method you will result in different efficiencies.
i edited my original reply, should be more helpful
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Old 02-15-2013, 01:26 PM   #5
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Originally Posted by progmac View Post
i edited my original reply, should be more helpful
Awesome response, much appreciated! A lot more information than I expected, which is always a good thing!
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Old 02-15-2013, 01:39 PM   #6
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Hopefully not too much of a side-track, but looks like about 10% difference between LME and DME. I thought it was more like 20% difference based on previous readings?
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Old 02-15-2013, 01:48 PM   #7
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Originally Posted by whoaru99 View Post
Hopefully not too much of a side-track, but looks like about 10% difference between LME and DME. I thought it was more like 20% difference based on previous readings?
I noticed that too. I used a potential gravity of 1.042 for DME, but I think in reality some of it is more like 1.045.

assuming 1.045 instead of 1.042 would make it look like:
2-row: 1.036
LME: 1.038
DME: 1.045

again using the examples of a 70% grain mash efficiency and an 85% grain mash efficiency --

36 * 0.70 mash efficiency = 25.2
25.2 / 38 = 0.66 pounds of lme per pound of grain
25.2 / 4= 0.56 pounds of dme per pound of grain

36 * 0.85 mash efficiency = 30.6
36* 0.85 = 30.6
30.6 / 38 = 0.81 pounds of lme per pound of grain
30.6 / 45 = 0.68 pounds of dme per pound of grain


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