Electric Brewing Supply 30A BCS Giveaway!


Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > How long should Stout actively ferment? Mine just halted fermentation.
Reply
 
LinkBack Thread Tools
Old 03-06-2013, 01:11 PM   #1
lorne17
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2013
Posts: 96
Liked 4 Times on 4 Posts
Likes Given: 3

Default How long should Stout actively ferment? Mine just halted fermentation.

Hello there,

I brewed an Irish Stout this weekend from brewers best. I was curious if it's normal for fermentation to start quickly (within the first 12 hours) and then halted almost completly (bubbles about once per minute or a little longer) after just about 72 hours?

Just curious whats typically for Irish Stout.

Thanks,
Lorne

__________________
B-do Brew (Denver, CO)

Fermenting:Tres Nieves Milk Stout Bottled: BALE BONDS Nut Brown | EASY RYDER Amber | STOUTISH SPINX Stout | BEE KING Van Cream Stout | MANN UND FRAU Hefe | CREAM OF THE CROP Cream | CAMBRIDGE CLOVER Red | NAUGHTY PINE Spiced Porter On Deck:Orange Belgian
lorne17 is offline
 
Reply With Quote Quick reply to this message
Old 03-06-2013, 01:16 PM   #2
aiptasia
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2011
Location: Them Scary Woods, FL
Posts: 3,519
Liked 531 Times on 469 Posts
Likes Given: 162

Default

It's typical for any beer. Each fermentation is unique and different. An assertive strain of yeast can rip through wort in less than 72 hours depending on the gravity of the beer, available nutrients and initial oxygen level. The only way to know if the primary fermentation is done is to take SG readings and have them remain the same for 2-3 days.

__________________
Paranormal Brewing
Beer so good, it's frightening.

2014: Seven Heavens Series One: Vilon, Mystic Melomel, Skeeter Pee.
aiptasia is offline
 
Reply With Quote Quick reply to this message
Old 03-06-2013, 01:18 PM   #3
beergolf
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
beergolf's Avatar
Recipes 
 
Join Date: Jan 2011
Location: collingswood, nj
Posts: 4,044
Liked 385 Times on 314 Posts
Likes Given: 119

Default

Each fermentation is different. Bubbles really do not mean anything more than the pressure inside the fermenter is higher than outside. During the first,very active part of fermentation CO2 can build up, but seeing no bubbles does not mean that fermentation is over.

Which yeast did you use? and what temperature is it at? The bulk of fermentation can be over pretty quick sometimes.

Here is a short video that shows bubbles really mean nothing....


__________________
beergolf is offline
Revvy Likes This 
Reply With Quote Quick reply to this message
Old 03-06-2013, 01:20 PM   #4
Revvy
Post Hoc Ergo Propter Hoc
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
Revvy's Avatar
Recipes 
 
Join Date: Dec 2007
Location: "Detroitish" Michigan
Posts: 40,804
Liked 2747 Times on 1648 Posts
Likes Given: 3485

Default

Your bubbles stopping only means that it's stopping bubbling, NOT necessarily that fermentation has halted. More than likely it's just slowing down, like all fermentation does.

You have fermentation. IGNORE what your airlock is or isn't doing. And trust those of us who've been doing it longer than you?

Bubbling doesn't really mean anything other than the airlock is bubbling. And airlock is not a fermentation gauge, it's a vent to bleed off EXCESS gas, be it oxygen or EXCESS co2. It shouldn't be looked at as anything else, because an airlock can bubble or stop bubbling for whatever reasons, including a change in temperature (gas expands and contracts depending on ambient temps) changes in barometric pressure (You can have bubbling or suckback in the airlock, depending on pressure on the fermenter) whether or not a truck is going by on the street, the vacuum cleaner is running, or your dog is trying to have sex with the fermenter. Or co2 can get out around the lid of the bucket or the bung...it doesn't matter how the co2 gets out, just that it is.

And bubbles don't coordinate with anything concrete within the fermenter either, "x bubbles/y minute" does NOT TRANSLATE to any numerical change in gravity....if an instruction says do something when bubbles do something per something, throw the instructions out.

Fermentation is not always dynamic, just because you can't see what's going on, doesn't mean nothing is going on. And just because your airlock starts up, and then slows down or stops in a few days, doesn't mean fermentation is over YET, it just means the excess co2 is not coming out of the airlock...not that the yeast is done.

The only way to know how your beer is doing is to take a hydrometer reading, if you're worried. But not until 72 hours have gone by. Then if you're still concerned, take one...then you'll know.

Counting bubbles does not equate to anything usable in fermentation. It's not like "x bubbles/minute= y gravity points." It just means that co2 is being released....but it could also NOT be bubbling, and still fermenting away.

Relax, leave your beer alone and let it do it's thing for a couple more weeks, and most importantly, IGNORE what your airlock does or doesn't do.

In fact you might find this discussion on the superfluousness of airlocks something that will help you get a handle on this. It was started by a newer brewing who just grasped this concept.

The way to determine if fermentation is complete, is to take 2 grav readings over a three day period. Not by counting bubbles.

__________________

Like my snazzy new avatar? Get Sons of Zymurgy swag, here, and brew with the best.

Revvy's one of the cool reverends. He has a Harley and a t-shirt that says on the back "If you can read this, the bitch was Raptured. - Madman

I gotta tell ya, just between us girls, that Revvy is HOT. Very tall, gorgeous grey hair and a terrific smile. He's very good looking in person, with a charismatic personality... he drives like a ****ing maniac! - YooperBrew

Revvy is offline
 
Reply With Quote Quick reply to this message
Old 03-06-2013, 01:28 PM   #5
ajdelange
Senior Member
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: McLean/Ogden, Virginia/Quebec
Posts: 6,130
Liked 613 Times on 506 Posts
Likes Given: 19

Default

Quote:
Originally Posted by lorne17 View Post
I was curious if it's normal for fermentation to start quickly (within the first 12 hours) and then halted almost completly (bubbles about once per minute or a little longer) after just about 72 hours?
Yes, that's normal for Irish stout. I remember brewing one on a Monday and drinking it with dinner on Wednesday (it wasn't too mellow but it was OK). But you need to be sure that fermentation is complete because I brewed on last year that stopped fermenting after about 72 hrs because of a cold spell when it was only half attenuated. That was pretty bad beer. So if the apparent attenuation is in the 70's you are OK. If not you have a problem.
__________________
ajdelange is offline
 
Reply With Quote Quick reply to this message
Old 03-06-2013, 01:44 PM   #6
lorne17
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2013
Posts: 96
Liked 4 Times on 4 Posts
Likes Given: 3

Default

Thanks all! I wasn't too worried, but just thought I'd ask.

Also I used a dry yeast (first time I used it) and rehydrated it prior to pitching it. I don't know what kind it was as I threw out the packet and this recipe: http://brewersbestkits.com/pdf/1023%...t%20Recipe.pdf doesn't list it. But that's my recipe I followed.

Thanks again for all the pointers! These forums rock...

__________________
B-do Brew (Denver, CO)

Fermenting:Tres Nieves Milk Stout Bottled: BALE BONDS Nut Brown | EASY RYDER Amber | STOUTISH SPINX Stout | BEE KING Van Cream Stout | MANN UND FRAU Hefe | CREAM OF THE CROP Cream | CAMBRIDGE CLOVER Red | NAUGHTY PINE Spiced Porter On Deck:Orange Belgian
lorne17 is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fermentation has halted...? Ailstock Beginners Beer Brewing Forum 4 01-24-2013 12:27 AM
How long does beer usually actively ferment? markiemark Fermentation & Yeast 1 08-23-2011 03:19 AM
Milk Stout - How long to secondary ferment!? bmickey Recipes/Ingredients 6 10-10-2009 12:37 AM
How long to let stout ferment flyboy Beginners Beer Brewing Forum 7 05-03-2008 11:55 AM
Halted fermentation? mullimat Beginners Beer Brewing Forum 3 03-20-2008 02:49 AM