Coldbreak Brewing HERMS Giveaway!

HomeBrewSupply AMCYL Brew Kettle Giveaway!


Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Honest, I looked. Mash Tun False Bottom vs Mash Ratio question
Reply
 
Thread Tools
Old 08-21-2013, 10:08 PM   #1
MuddyCreek
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
MuddyCreek's Avatar
Recipes 
 
Join Date: Aug 2012
Location: Butte, MT
Posts: 672
Liked 326 Times on 168 Posts
Likes Given: 144

Default Honest, I looked. Mash Tun False Bottom vs Mash Ratio question

So I've looked around some threads, done a search, looked through my various books and I finally accept that I'm just going to ask the question...

I generally do a mash ratio at around 1.33. It's a nice middle ground and I've been happy with the results generally speaking. But here's where it gets complicated...

I have a Coleman 7 gallon cooler/mash tun. I was using a stainless braid with it, but that was giving me some stuck mash issues. So, I put together a simple PVC platform with a custom-built screen over the top to serve as a false bottom and keep the grain off the braid. It works great.

However, I need about 1.5 gallons of water underneath the bottom to bring the level up to the base of the screen. (problem due to the placement of the thermoprobe. I have to have the false bottom a little higher than I would have liked it otherwise.)

Anyway, I simply fill the tun up to the base of the false bottom with liquor and then add my mash volume along with my grain. This keeps my grain hydrated at the proper amount BUT, since I run a HERM system, I technically have a lower gravity after my mash than I am expecting. This isn't really an issue since I match my sparge amounts as well as I can and then boil down to my target fermenter amount. (Ultimately, it comes down to math and I have a spreadsheet that pretty well spells it all out for me.)

My question is sort of just academic... Is the mash ratio water amount expected to be in addition to the liquor underneath the false bottom (I assume so, otherwise your mash would be too thick.) and if so, are there specific formulae that take your 'under-bottom' liquor amount into account when figuring the expected pre-boil gravity?

It could be this is just one of those 'learn your equipment' things. Like I said, I either adjust my sparge amount to account for the extra liquor in the first runnings from the under-bottom or I boil down as necessary and do the math from either of those two points.

ideas and input welcome. I've just never seen any specific discussion of under-bottom liquor amounts and how that relates to your mash and sparge volumes.


__________________
Muddy Creek Brewery
~~~~~~~~~~~~~~~~~~
2 E. Galena Street
Butte, MT 59701

http://www.muddycreekbrewery.com

MuddyCreek is offline
 
Reply With Quote
Old 08-23-2013, 12:33 AM   #2
dyqik
Feedback Score: 1 reviews
Recipes 
 
Join Date: Jun 2013
Location: Maynard, MA
Posts: 878
Liked 134 Times on 107 Posts
Likes Given: 1

Default

Beersmith and the like add the dead space in the tun for the strike volume on top of the volume indicated by the mash thickness ratio. "Dead space" is probably the search term you are looking for.
dyqik is online now
 
Reply With Quote
Old 08-23-2013, 02:35 PM   #3
MuddyCreek
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
MuddyCreek's Avatar
Recipes 
 
Join Date: Aug 2012
Location: Butte, MT
Posts: 672
Liked 326 Times on 168 Posts
Likes Given: 144

Default

Thank you. Appreciate the feedback.
__________________
Muddy Creek Brewery
~~~~~~~~~~~~~~~~~~
2 E. Galena Street
Butte, MT 59701

http://www.muddycreekbrewery.com

MuddyCreek is offline
 
Reply With Quote
Reply


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stout Tanks Mash Tun vs Blichmann Mash Tun (w/ false bottom) julian81 Equipment/Sanitation 38 03-27-2014 12:35 AM
mash tun false bottom - will the AIH false bottom work? BullGator All Grain & Partial Mash Brewing 4 08-12-2013 01:34 AM
Mash tun false bottom and mash thickness shushikiary All Grain & Partial Mash Brewing 2 11-29-2011 09:13 PM
Mash Tun/False Bottom Noob Question JLW Kettles, Mash Tuns, & Hot Liquor Tanks 1 11-17-2010 12:04 AM
Mash in Keggle - False Bottom vs. amount of mash water Griffsta All Grain & Partial Mash Brewing 2 03-24-2009 01:09 PM


Forum Jump

Newest Threads

LATEST SPONSOR DEALS