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Messages - jjflash

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All Grain Brewing / Re: observation of dissolved oxygen loss in wort
« on: April 29, 2013, 06:41:33 PM »
I think yeast oxygen toxicity is a wildly propagated urban myth for brewers.  No doubt you can kill most anything with excessive oxygen.  However, with our brewing practices this is unlikely to happen and needless worry. Excessive oxygen, in my opinion, is rarely a problem.

I do believe you can use excessive oxygen that negatively affects beer flavor, producing fusel alcohols and acetaldehyde.

I do believe that consistent control of dissolved oxygen in wort is critical to steady yeast growth and yeast production of desirable flavor compounds.

Low gravity beers <1.060 are very forgiving of mistakes and this information is not as applicable to these beers. High gravity beers >1.080 are much less forgiving of mistakes and this information is more important for their success.

All Grain Brewing / observation of dissolved oxygen loss in wort
« on: April 28, 2013, 06:50:30 PM »
Just finished brewing today and have an interesting observation to share/discuss.

Brewed an Imperial Stout OG 1.094. I use an in-line oxygen system into a 7.5 gallon glass carboy with a Hach luminescent dissolved oxygen meter in the carboy.  Wort is at 65 degrees.  I use the standard 1ppm/degree Plato oxygen per the "Handbook of Brewing", Priest and Stewart.  I have been running this identical oxygen set up for about 2 years now.  I run the wort into the carboy and adjusted the oxygen flow to hit my desired number, then immediately pull the Hach LDO out of the carboy.  Today for the first time I decided to leave the LDO in the carboy and take a few readings over the next couple hours. Initial reading upon filling the carboy 20+ppm O2. Did not pitch the yeast.  Over the next hour the oxygen saturation is down to 5.2!  No yeast, carboy sitting at 65 degrees in the refrigerator.  I was blown away how quickly the oxygen came out of solution. Pitched the yeast and thirty minutes later oxygen saturation of zero!

Appears to me that my in line oxygen set up is near worthless as most all the oxygen came quickly out of solution in the carboy. I always thought an in line oxygen system was the most efficient method.  I now suspect any other delivery system would suffer this same problem. Perhaps a better way is to rack to the carboy and run a very slow, continuous oxygen flow via airstone into the carboy for the first 24 hours?

Repeat short compressor cycles are suppose to hasten the demise of refrigerators/freezers.  For digital temperature controllers I program in two degrees which gives a four degree variance.  For my analog temperature controllers I always put my temperature probe in a PET soda bottle full of water to help prevent rapid cycles.

How do you control the freezer temperature?

General Homebrew Discussion / Re: Begian Dark vs Quad
« on: April 14, 2013, 03:56:34 PM »
What we need is Gordon Strong at a time like this.
He would have the definite answer.
Mr. Strong you in town?

All Grain Brewing / Re: calcium carry over to kettle question
« on: March 06, 2013, 08:04:31 PM »
So my error in thinking is that I want a final 100ppm calcium in the kettle?
I should be satisfied with 25-35ppm?

I thought yeast perform best with about 100ppm calcium in the fermentor?
Do probrewers then add kettle calcium chloride solely as a flavor ion?

I have to admit I have read the Colin Kaminski/A J DeLange/ Kai thread (all 222 replys) at BN at least two dozen times trying my best to understand this concept and still don't have it. Granted they are very smart fellows and and I am just an ordinary, average guy (Joe Walsh).

All Grain Brewing / Re: calcium carry over to kettle question
« on: March 05, 2013, 07:31:02 PM »
I wouldn't worry much about it. The calcium recommendations for water already take that into account.

Kai I don't understand this statement.
I have been using Brun Water for calculations.
I don't see where calcium carry over loss is accounted for in this, or any other water program.
Seems like I am coming up short on kettle calcium without a kettle addition.

All Grain Brewing / calcium carry over to kettle question
« on: March 04, 2013, 08:00:59 PM »
The numbers I find quoted are 25% - 35% calcium carry over from mash tun to kettle.
I have assumed the spread may perhaps be related to some brewers using calcium additions to sparge water -> maybe.
I have also seen quoted that probrewers like to use 2/3 calcium in the mash and 1/3 calcium in the kettle.
How much all this is true I don't know but these numers seem to come up most frequently in my research.

So I have been shooting for 100ppm calcium using both calcium chloride and calcium sulfate at various ratios depending if it's a malt forward beer or a hop forward beer.
Mash tun 100ppm calcium
Sparge water 100ppm calcium
That means my kettle carry over is down to 25 - 35 ppm calcium.
Seems to me I would top off my kettle with 65 - 75ppm calcium to hit the 100 ppm mark.
That's a 57:43 ratio vs recommended 67:33 ratio - but close enough I believe.

Is this a reasonable conclusion?

Equipment and Software / Re: recirculating wort return device
« on: February 02, 2013, 08:39:22 AM »
I have used that very same plastic wort aerator on my RIMS system for years and am pleased with its fluid dispersion back into the mash. Run mine just below the mash fliud level.

Only time I have found it useful to make a starter with dry yeast is stuck fermentation for a big beer.
Best to pitch really active yeast starter to kick start fermentation again.
Sprinkling dry yeast on stuck fermentation has never worker for me.

General Homebrew Discussion / Re: Soapy off flavor
« on: January 12, 2013, 08:33:39 AM »
In one of my pro books I recall reading too high a final beer pH can produce a soapy flavor.
I don't recall the exact number but I believe something like >4.8

Yeast and Fermentation / Re: An alternative to starters
« on: December 21, 2012, 04:02:04 PM »
I would use this technique if I had a 15 bbl kettle and a 30 bbl fermentor.
Would have to brew twice to fill the fermentor anyway.
Significant yeast cost difference 15 vs 30 bbl.
Perfect for that setup.
Until then stir plate and double step for really big OG beers.

All Grain Brewing / Re: Wet milling fail / I'm an idiot
« on: December 18, 2012, 05:55:31 PM »
More important than malt conditioning is the quality of your mill.
Some mills will shread malt husks to pieces when set to narrow gap.
(Some are so poorly designed they seem to shred regardless of the gap setting.)
To compensate for this brewers will open the mill gap too large with resultant decreased conversion.
Some brewers will even routinely add rice hulls to prevent sparge issues.

The best mills will fine crush with minimal flour and leave husks more intact.
Quite often these brewers will have motor drives on their mills.
These quality mills can fine crush without lauter concerns and get great conversion.

So the bottom line is that some mills with malt conditioning will allow you to crush finer and which may improve your conversion. Will also help prevent lauter issues.

I suggest a quality mill with a motor drive.

There is an excellent article by Chris Bible in the new January-February Brew Your Own about grain mills construction and use.  Great read.

Ingredients / Belgian Champagne Beer (Deus) spice recommendations
« on: December 15, 2012, 11:25:37 AM »
I am finally going to make a Deus clone using Drew Beechums / Maltose Falcons recipe and directions.  The Deus spice recommendations are lavender, cinnamon, allspice and ginger in the bottling sugar solution.  However, he makes no quantity suggestions for each of these spices.  Anyone done this recipe and have suggestions on the amount of each spice to use?

Ingredients / Re: Storing HOP Pellets
« on: December 14, 2012, 08:02:05 AM »
I feel like using old hops gives you the bitterness, but not the aroma and flavor

You nailed it there.  From the moment hops are harvested they begin to deteriorate. Careful handling with freezer temperatures and CO2 enviroment will slow deterioration, but will not halt the process. We loose aroma, flavor and bitterness it that order.

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