Dilution to wort and how water effects OG - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Dilution to wort and how water effects OG

Reply
 
Thread Tools
Old 08-09-2012, 12:57 AM   #1
mattpsu27
Recipes 
 
Aug 2012
Posts: 9


Hi I'm new to the site although I've been brewing for quite some time. I have a quick question around dilution and the approximates on the gravity reading. I had a gravity reading of 1.078 after boil. Making an IPA. I diluted about 5 gal of wort with 32 oz of water but forgot to take another reading. Dumb I know.

Anyone know how much the OG would've dropped by/lowered to?

Thanks
Matt

 
Reply With Quote
Old 08-09-2012, 01:28 AM   #2
uncommonsense
Recipes 
 
Jan 2011
lincoln, illinois
Posts: 384
Liked 5 Times on 5 Posts


Quick check with my software say 1.074

 
Reply With Quote
Old 08-09-2012, 01:40 AM   #3
ktblunden
Senior Member
HBT_SUPPORTER.png
 
ktblunden's Avatar
Recipes 
 
Dec 2011
Lancaster, CA
Posts: 1,973
Liked 340 Times on 208 Posts


640 oz (5 gal) times 1.078 equals 689.92
32 oz times 1.000 equals 32
689.92 plus 32 equals 721.92
721.92 divided by 672 oz equals 1.074

 
Reply With Quote
Old 08-09-2012, 02:04 AM   #4
mattpsu27
Recipes 
 
Aug 2012
Posts: 9

Quote:
Originally Posted by ktblunden
640 oz (5 gal) times 1.078 equals 689.92
32 oz times 1.000 equals 32
689.92 plus 32 equals 721.92
721.92 divided by 672 oz equals 1.074
Thanks!

 
Reply With Quote
Old 08-09-2012, 02:29 AM   #5
nukebrewer
Brew the brew!
HBT_LIFETIMESUPPORTER.png
 
nukebrewer's Avatar
Recipes 
 
Oct 2008
Groton, CT
Posts: 5,666
Liked 2865 Times on 1733 Posts


An alternate approximation would be to take the original volume and divide it by the final volume to get a reduction factor. Then multiply the reduction factor by your initial points value ((SG-1)*1000). So,

RF = 5 gal/5.125 gal = .976

74 * .976 = 76

Convert back to SG is 1.076

I know it's different than what others have said, but just wanted to throw out a different way to do it that has always worked for me.
__________________
The only thing more asinine than stupid rules is the enforcement of rules simply because they are the rules.

Inhopsicated: A Beer Blog

Inhopsicated on Twitter

 
Reply With Quote
Old 08-09-2012, 02:50 AM   #6
mattpsu27
Recipes 
 
Aug 2012
Posts: 9

Thanks. You misstated the 5.125 rather than 5.25 since 32 oz is .25 of 128, and 76 rather than 78 OG, but the actual calculation looks correct.

Appreciate everyone's help!

 
Reply With Quote
Old 08-09-2012, 03:08 AM   #7
nukebrewer
Brew the brew!
HBT_LIFETIMESUPPORTER.png
 
nukebrewer's Avatar
Recipes 
 
Oct 2008
Groton, CT
Posts: 5,666
Liked 2865 Times on 1733 Posts


Terribly sorry for that miscalculation. Using 5.25 gallons I also get 1.074.
__________________
The only thing more asinine than stupid rules is the enforcement of rules simply because they are the rules.

Inhopsicated: A Beer Blog

Inhopsicated on Twitter

 
Reply With Quote
Old 08-09-2012, 03:10 AM   #8
nukebrewer
Brew the brew!
HBT_LIFETIMESUPPORTER.png
 
nukebrewer's Avatar
Recipes 
 
Oct 2008
Groton, CT
Posts: 5,666
Liked 2865 Times on 1733 Posts


Quote:
Originally Posted by nukebrewer
74 * .976 = 76
Haha, I think I was drunk when I wrote that. That just plain doesn't make any kind of sense. I meant 78 instead of 74.
__________________
The only thing more asinine than stupid rules is the enforcement of rules simply because they are the rules.

Inhopsicated: A Beer Blog

Inhopsicated on Twitter

 
Reply With Quote
Old 08-09-2012, 11:25 PM   #9
erockomania
Recipes 
 
Jun 2010
SF CA
Posts: 307
Liked 6 Times on 6 Posts


Or just type in 5.25 into our spread sheet
__________________
---------
regularly brewed ales:
Hopostle single IPA
Hopostle double IPA
Brooklynn Brew Saison (every summer)

 
Reply With Quote
Reply
Thread Tools



Forum Jump