Mash and sparge volume question - Home Brew Forums

Register Now!
Home Brew Forums > Home Brewing Beer > General Techniques > Mash and sparge volume question

Reply
 
Thread Tools
Old 11-03-2010, 06:35 AM   #1
IPAAAA
Recipes 
 
May 2010
ca
Posts: 443
Liked 6 Times on 1 Posts



When mashing does the first volume of water you use suppose to be more or less then the amount of sparge water you use? I am trying to have 7.5 gallons pre boil.

This is what I have for my current recipe:

15lb total grain

15x1.5=22.5 qtrs of water % 4 = about 5.62 gal water for the mash

15x.125 (grain absorption) = 1.875 gal of water absorbed by grains

5.62-1.875=about 3.75 gals of wort from mash.

So 7.5-3.75=3.75 gal of water to sparge with.

Does this look correct? I thought I read somewhere that your sparge amount should be higher then the initial mash amount when it comes to water volume. Please let me know if that is incorrect.

 
Reply With Quote
Old 11-03-2010, 10:58 AM   #2
riverfrontbrewer
 
riverfrontbrewer's Avatar
Recipes 
 
Sep 2009
Denver, CO
Posts: 1,123
Liked 34 Times on 29 Posts


These look pretty good...my only change if this was my calc would be that I normally assume .1 per lb grain absorption instead of your .125. Very minor difference though.

 
Reply With Quote
Old 11-03-2010, 12:02 PM   #3
cactusgarrett
Recipes 
 
Apr 2008
Madison, WI
Posts: 975
Liked 7 Times on 5 Posts


That's exactly how I do it, too. You may have heard that about sparge being higher than the initial volume, which could be related to a wort quality/optimization thing, but when sparging, IMHO the most important thing is making your target pre-boil volume.
__________________
~~ Malted barley wants to become beer. ~~

 
Reply With Quote
Old 11-03-2010, 02:41 PM   #4
CaptKiRkLeS
 
CaptKiRkLeS's Avatar
Recipes 
 
Oct 2009
Staten Island, NY
Posts: 281
Liked 3 Times on 3 Posts


This brings up another question about the amount of water needed...Say I use the calculated mash and sparge but I run short on my pre-boil volume, do I add more sparge water to my MLT? Could I just add extra water to the initial sparge water and stop once I hit my pre-boil or would I just be losing efficency?
__________________
Brew on!

Beer is proof that God loves us and wants us to be happy!

 
Reply With Quote
Old 11-03-2010, 04:56 PM   #5
IPAAAA
Recipes 
 
May 2010
ca
Posts: 443
Liked 6 Times on 1 Posts


Quote:
Originally Posted by riverfrontbrewer View Post
These look pretty good...my only change if this was my calc would be that I normally assume .1 per lb grain absorption instead of your .125. Very minor difference though.
Thanks. Doing .125 has been having me constantly hitting my volumes so I will stick to that.

Quote:
Originally Posted by cactusgarrett View Post
That's exactly how I do it, too. You may have heard that about sparge being higher than the initial volume, which could be related to a wort quality/optimization thing, but when sparging, IMHO the most important thing is making your target pre-boil volume.
Well I am glad I am doing it the correct way.

Quote:
Originally Posted by CaptKiRkLeS View Post
This brings up another question about the amount of water needed...Say I use the calculated mash and sparge but I run short on my pre-boil volume, do I add more sparge water to my MLT? Could I just add extra water to the initial sparge water and stop once I hit my pre-boil or would I just be losing efficency?
I would think putting it in the MLT wouldn't lose efficiency. I have heard of people added water directly to their fermenter to reach their volume but I could be wrong.

 
Reply With Quote
Old 11-03-2010, 05:38 PM   #6
devilishprune
Recipes 
 
Mar 2010
Posts: 1,241
Liked 9 Times on 9 Posts


Quote:
Originally Posted by CaptKiRkLeS View Post
This brings up another question about the amount of water needed...Say I use the calculated mash and sparge but I run short on my pre-boil volume, do I add more sparge water to my MLT? Could I just add extra water to the initial sparge water and stop once I hit my pre-boil or would I just be losing efficency?
Adding more water than you need is going to reduce your efficiency unless you increase your boil to compensate.

You have a set amount of sugars in your grain that you are going to get out during the sparge.

Lets say you want 7.5 gallons total volume, and you have 4.5 from your mash.

If you use the correct amount of sparge water, 3 gallons assume you get runnings at 1.040 gravity. If you used 3.5 gallons under the same conditions then you would get your runnings at (1.04*3=C*3.5) 1.034 which would lower the total gravity of your boil, and thus the gravity going into the fermenter UNLESS you boiled off that extra half gallon.

I always heat up more sparge water than I think that I'll need, but I'm sure to measure the first runnings of the mash so that I can get an accurate pre-boil volume before I start sparging. If you run short, then you can just do a small second sparge.

 
Reply With Quote
Old 11-03-2010, 06:35 PM   #7
maida7
Recipes 
 
Nov 2009
Asheville, NC
Posts: 2,827
Liked 48 Times on 41 Posts


Quote:
Originally Posted by IPAAAA View Post
When mashing does the first volume of water you use suppose to be more or less then the amount of sparge water you use? I am trying to have 7.5 gallons pre boil.

This is what I have for my current recipe:

15lb total grain

15x1.5=22.5 qtrs of water % 4 = about 5.62 gal water for the mash

15x.125 (grain absorption) = 1.875 gal of water absorbed by grains

5.62-1.875=about 3.75 gals of wort from mash.

So 7.5-3.75=3.75 gal of water to sparge with.

Does this look correct? I thought I read somewhere that your sparge amount should be higher then the initial mash amount when it comes to water volume. Please let me know if that is incorrect.
Have you accounted for dead space in the MLT? Depending on the design of your MLT you could end up just a bit short of your pre-boil volume if you do not account for the dead space.

 
Reply With Quote
Old 11-03-2010, 06:47 PM   #8
IPAAAA
Recipes 
 
May 2010
ca
Posts: 443
Liked 6 Times on 1 Posts


Never had an issue with dead space. I always end up pulling the MLT towards me to try and get every little last bit out.

 
Reply With Quote
Old 11-03-2010, 06:52 PM   #9
CaptKiRkLeS
 
CaptKiRkLeS's Avatar
Recipes 
 
Oct 2009
Staten Island, NY
Posts: 281
Liked 3 Times on 3 Posts


Aha..gotcha. I am still working on getting my numbers down. So I will see how it turns out this weekend.
__________________
Brew on!

Beer is proof that God loves us and wants us to be happy!

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mash pH and Full Volume / No Sparge Mash bigjoe General Techniques 16 11-20-2009 05:11 PM
Batch Sparge and Water volume Chicago1948 General Techniques 12 05-26-2009 06:14 PM
Quick Mash/Batch Sparge question BugleBrew General Techniques 5 09-22-2008 06:15 PM
Mash and Sparge Calculations (yes again) jayhoz General Techniques 7 09-21-2007 11:45 AM
Sparge Water Volume jayhoz General Techniques 5 05-02-2007 12:57 AM


Forum Jump