New Giveaway - Wort Monster Conical Fermeneter!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Minor brew day screw up, could use a quick assist...




Reply
 
LinkBack Thread Tools Display Modes
Old 03-12-2010, 11:10 PM   #1
damdaman
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Portland, OR
Posts: 485
Liked 10 Times on 10 Posts

Default Minor brew day screw up, could use a quick assist...

3rd all grain/partial batch, trying to do a partial mash IIPA. Went for a low mash temp (149), hit it pretty right on, but lost more degrees than expected over the 90 minute mash. It finished between 142-146 depending on what part of the pot I measured, so I was already worried about low conversion (I don't have any iodine to test with).

But then I went and spilled probably about 1/2-3/4 gal of the mash water (sparge water wouldn't have been as bad). Great...

So I went and combined and I'm bringing it to a boil anyway. I've got some extra LDME on hand that I can throw in to bring up the gravity, but I'd like to calculate how much to add. My recipe already called for 3 lbs LDME and 1 lb dextrose to be added. Can someone help me calculate how much extra LDME I need to bring the boil up to around 1.075 - 1.080 at 6.5 gallons (OG after evaporation around 1.090 @ 5.25 gal)?

Measured gravity at 145*, 6.5gal (without the 3lbs LDME and 1 lb dextrose already planned) is 1.020, I have no idea how many points to add for the 145*, nor how much this will go up when I add the planned LDME and dextrose... help?



__________________
damdaman is offline
 
Reply With Quote Quick reply to this message
Old 03-13-2010, 12:33 AM   #2
pompeiisneaks
Why that human mask?
Feedback Score: 0 reviews
 
pompeiisneaks's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Redmond, WA
Posts: 897
Liked 41 Times on 29 Posts
Likes Given: 2

Default

145 deg w/ 1.020 becomes 1.037 I can't remember the cups of DME to gravity... but is that gravity w/. the LDME already added? somewhere here, if you search, there's something I've read that X cups of DME = 1.020 additional gravity or the like... Try the wiki?

I'll peek too.



__________________
~Phil
Fermenting/Kegged/Bottled NONE :( I moved to the NW and haven't had time to setup my brew rig since! (but hey, I'm in the Pacific NW so there's so much awesome beer I don't need to brew it as much hah!
pompeiisneaks is offline
 
Reply With Quote Quick reply to this message
Old 03-13-2010, 12:41 AM   #3
pompeiisneaks
Why that human mask?
Feedback Score: 0 reviews
 
pompeiisneaks's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Redmond, WA
Posts: 897
Liked 41 Times on 29 Posts
Likes Given: 2

Default

Sorry not finding it... I did a quick test and 5lbs of LDME moved up to 1.038 OG on my software... if you were expecting it to go up more, then... something in that range will work. Don't count this as a guarantee. I'd add the LDME after you get ready to go... then see where your gravity is... From How To Brew, here's a table for the gravity per temps:

http://www.howtobrew.com/appendices/appendixA.html

__________________
~Phil
Fermenting/Kegged/Bottled NONE :( I moved to the NW and haven't had time to setup my brew rig since! (but hey, I'm in the Pacific NW so there's so much awesome beer I don't need to brew it as much hah!
pompeiisneaks is offline
 
Reply With Quote Quick reply to this message
Old 03-13-2010, 12:44 AM   #4
damdaman
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Portland, OR
Posts: 485
Liked 10 Times on 10 Posts

Default

Thanks...

The 1.020@ 145* was without the LDME or dextrose. I did some estimations and I'm guessing 1lb LDME = about .008-.009 gravity points. So this is my guess:

1.037 + .018 from evaporation = 1.055 + 3 lbs LDME = 1.079 + 1 lb dextrose (no idea how much this is, but let's say .012) = 1.091, so it would seem I'm in the right range already?? Not sure how that's possible, maybe I spilled less wort than I thought or got higher efficiency than I thought?

I did decide to add 1.5 lbs. LDME just in case though. I guess we'll see what the OG is once it's done and cooled.

On edit: if I use you calculations of 1 lb LDME = .007 gravity points I get what sounds more accurate, SG of 1.081 (assuming dextrose = .01 instead of .012). So adding the 1.5 lbs of LDME should give me about 1.092 which what my recipe called for... let's hope it worked!

__________________

Last edited by damdaman; 03-13-2010 at 12:51 AM.
damdaman is offline
 
Reply With Quote Quick reply to this message
Old 03-13-2010, 02:17 AM   #5
pompeiisneaks
Why that human mask?
Feedback Score: 0 reviews
 
pompeiisneaks's Avatar
Recipes 
 
Join Date: Jan 2009
Location: Redmond, WA
Posts: 897
Liked 41 Times on 29 Posts
Likes Given: 2

Default

Let us know. cheers

__________________
~Phil
Fermenting/Kegged/Bottled NONE :( I moved to the NW and haven't had time to setup my brew rig since! (but hey, I'm in the Pacific NW so there's so much awesome beer I don't need to brew it as much hah!
pompeiisneaks is offline
 
Reply With Quote Quick reply to this message
Old 03-13-2010, 06:01 AM   #6
damdaman
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2009
Location: Portland, OR
Posts: 485
Liked 10 Times on 10 Posts

Default

OG was 1.082... which is close to "good enough." I've heard you can add dextrose partially through a big fermentation to encourage the yeast, so I'm going to look into that. But 1.082 is probably close enough. Thanks for the help!



__________________
damdaman is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Did I screw my brew up w/ the airlock? Cerpintine Beginners Beer Brewing Forum 6 06-10-2009 07:43 AM
1st brew - a few minor problems but think all is well phatuna Beginners Beer Brewing Forum 2 03-10-2009 12:03 AM
quick mead screw up?????? flyweed Mead Forum 4 12-12-2008 07:47 PM
Assist with my experimental brew? PintOfBitter Recipes/Ingredients 13 02-16-2008 04:37 AM
Help with my first brew - did I screw up? whiskeyinthejar Beginners Beer Brewing Forum 7 09-06-2007 08:20 PM