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Home Brew Forums > Home Brewing Beer > General Techniques > Closed-system pressurized fermentation technique!
View Poll Results: What do you guys think about pressure fermentations? Time for a poll.
I've done it and I liked it just fine! 83 11.34%
I've done it, nothing wrong with it, but prefer normal fermentation techniques. 20 2.73%
I've done it, hate it, and never will do it again! 4 0.55%
I've never done it, but it is on my list! 545 74.45%
I've never done anything. I only brew beer in my mind. 80 10.93%
Voters: 732. You may not vote on this poll

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Old 04-11-2013, 12:58 AM   #1761
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I fill kegs by weight. 8.35#/gallon + keg weight (9.2#) = about 51#. I weigh them with a digital luggage scale I bought from wal-mart for like $10.

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Old 04-11-2013, 07:25 PM   #1762
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Thanks.
I am thinking to simplify it and use 2 primary kegs.. 2 yeast strains in same batch is on my mind for a while..
I could cut gas dip tube to enlarge volume for krasuen.

With how much wort do you fill your kegs?

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Old 04-11-2013, 08:33 PM   #1763
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diS, If my memory serves be well, I believe I had no blow-through, all contained with this one .....


10/23/11 by Mad Scientist Brewhaus, on Flickr

It really depends on several factors, e.g. yeast, temperature and pressure, to name three. How much pressure you allow during the first several days of primary fermenting. I used US-05, 65* F and the pressure around 12 psi.

This one is 1 pint short of 5 US gallons, in a 5 gallon keg.

EDIT: I also used fermcap-s. ~10 drops...

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Old 04-14-2013, 10:18 PM   #1764
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Been following this thread for years and was hoping I could contribute something. I haven't started brewing yet but am planning out my build. Because of space limitations in the fridge after installing a brewhemoth, I wanted to make something that could fit in the fridge door and be able to disconnect it without losing pressure in the fermenter if maintenance was needed, along with lots of safeguards.

Here is what I came up with combining a lot of other posts ideas, way over-engineered but it is modular enough to add or remove as budget permits, I know this can be done cheaper so please offer up substitute components and links, and I'll make updates.

Spunding Parts and Costs

Spunding Build Diagram

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Old 04-15-2013, 11:40 AM   #1765
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How much wort do you plan to put in the conical, you'll have 22gal to work with so you might not need the filter housing to control blow off.

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Old 04-15-2013, 01:44 PM   #1766
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Main reason for the filter/water bath is to scrub beer aerosol before it gets to the valve, but I can see brewing 15-20 gallon batches at some point in the future.

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Old 04-21-2013, 03:11 PM   #1767
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Have you guys been reading the yeast immobilization threads? I'm hopeful this could be a new thing in our closed systems. Very interesting stuff and of course suspect in the brewing world. So far the experiment produced a clean brew with low krausen and very low sedimentation. Check it out!

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Old 04-21-2013, 09:54 PM   #1768
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Quote:
Originally Posted by WortMonger View Post
Have you guys been reading the yeast immobilization threads? I'm hopeful this could be a new thing in our closed systems. Very interesting stuff and of course suspect in the brewing world. So far the experiment produced a clean brew with low krausen and very low sedimentation. Check it out!
I hear the guy doing the experiment is utterly irresistible to women, too!

(Thanks for the plug WortMonger! I remain skeptical that this could replace normal yeast pitching, but if it does the possibilities for pressurized fermentations are very cool.)
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Old 05-20-2013, 03:47 PM   #1769
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I'm just getting back into my closed system setup, now with a brewers hardware setup that has been working great.

I brewed Wednesday a simple lager and set the valve to about 2 PSI, came back next day to see it holding there. At +3 days I upped PSI to 4, and took a sample to find 45% attenuation. I just took a sample out last night and adjusted PSI to 5 (at +5 days), and have that sample degassing out overnight and will get a reading over lunch.

I plan to get the PSI up to 7 tomorrow. I wanted to check my practice of a D-rest as I've struggled with Diacetyl in the past. I was planning around 55% attenuation to take it out of the fridge and leave it at room temperature in my basement ~ 66 degrees for at least a couple of days.

I know some people have had great success with long D-rest's of up to two weeks. Also during this D-rest should I start just allowing the pressure to build up a bit? It looks like if I was around 15-16 PSI overall that would get me around 1.7 volume co2, which isn't terrible far off the end result.

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Old 05-21-2013, 03:34 PM   #1770
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Quote:
Originally Posted by -MG-
I know some people have had great success with long D-rest's of up to two weeks. Also during this D-rest should I start just allowing the pressure to build up a bit? It looks like if I was around 15-16 PSI overall that would get me around 1.7 volume co2, which isn't terrible far off the end result.
I would go ahead and set it to carb at what temperature it is at when you pull it out for a d-rest. Then again, I'd probably let it stay in the primary temps until I hit 70-75% attenuated, then pull and set for carb at my d-rest temps. That's just me though.
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