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Old 08-06-2013, 10:51 PM   #11
Hex23
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Jun 2010
Illinois, Lake County
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Quote:
Originally Posted by mgohring View Post
Oops! Meant to say that I take a preboil gravity reading after I've hit my preboil volume, not gravity.
You also meant to say that "Preboil gravity will always be lower than your original gravity"

 
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Old 08-06-2013, 11:03 PM   #12
Hex23
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Jun 2010
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Quote:
Originally Posted by itsratso View Post
most recipes i have seen have the OG listed. so if i have a similar assumed efficiency then the OG is the target gravity (if not just using the time method)?
Correct. The OG listed for a recipe is a target. By definition it's what you'll get if you have the right volume and hit the efficiency target. But often efficiency can be hard to predict, until you monitor your process a few times. predictable efficiency is much more important than high efficiency, but you should easily be able to get at least 70% efficiency with good process.

Also your target OG has nothing to do directly with which sparge method you use. Although, sparge method can affect efficiency. Also, stopping the runnings at a certain gravity is most often associated with fly sparging where the running gravity is changing continuously over time. The reason to stop at somthing like 1.010 is that it's an indication that mash pH could be getting high which can lead to tannin extraction. With batch sparging the runnings for a given batch should be about the same. And if you have relative few, but large batches your runnings won't go to a low gravity. Keeping the runnings at a slow rate is also associated with fly sparging where a fast runoff can lead to channeling and a reduction in efficiency.

 
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Old 08-06-2013, 11:36 PM   #13
mgohring
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Dec 2010
Lincoln, NE
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Quote:
Originally Posted by Hex23

You also meant to say that "Preboil gravity will always be lower than your original gravity"
Geez talk about fail! Too many beers I guess...

 
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Old 08-07-2013, 12:19 AM   #14
certaut
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Dec 2010
hughes springs, Texas
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mash till the iodine test is good,,, (screw time)
sparge till you get what you want in the boil kettle
and [email protected] the numbers
__________________
the brewer makes the beer, not the equipment
let the beer tell you when it is finished

 
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Old 08-08-2013, 01:14 AM   #15
itsratso
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Jan 2013
berwyn, il
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Quote:
Originally Posted by certaut View Post
mash till the iodine test is good,,, (screw time)
sparge till you get what you want in the boil kettle
and [email protected] the numbers
well that is certainly a new take on things. i like the simplicity of it... hmm...

 
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