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Topics - hopfenundmalz

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The Pub / "The Martian"
« on: July 27, 2015, 05:03:06 PM »
Searched for this and did not find a reference to "The Martian" by Andy Wier. Finished it last week, very good story of an astronaut stranded on Mars. Pretty good on the technical parts. Story is involved, and full of points in the plot where the Martian environment almost kills him. A good read.

It is being made into a movie, Matt Damon as the lead, Ridley Scott directs.

Ingredients / Downey Mildew and Michigan Hops
« on: July 20, 2015, 06:42:40 AM »
I am seeing some on my hops. It has been really wet here. This is one of the reasons hop growing left the Midwest for the PNW. In recent years hop growing has started to come back to MI, approaching 500 acres this year.

There was a discussion on how to transfer beer and minimize staling in the beer here.

Sean makes the statement that if you have a DO meter you become shocked as to how much purging is necessary to achieve low levels. How much is that?

There are procedures to purge vessels of toxic or explosive gases. If you search for "pressure cycle purge equation" you will get hits to some links with information. Without going into all the details and the derivation, you can estimate how many purge cycles you need to reach a level of gas concentration.


N=Number of purge cycles
Clow=Lower concentration target
Coriginal=Original concentration, so for air that is 0.21
Plow=Low pressure, 14.7 PSI absolute for our application
Phigh=High pressure for the purging, I use 30 PSI gauge, so 44.7 PSI absolute

For our case.

selecting a sequence of 0.1, 0.01, 0.001... we can calculate the number of cycles. Round up for your application.

Concentration   #purge cycles.

0.1   0.6671342451
0.01   2.7375696785
0.001   4.8080051119
0.0001   6.8784405452
0.00001   8.9488759786
0.000001   11.019311412
0.0000001   13.0897468454
0.00000001   15.1601822787
0.000000001   17.2306177121

So to get close to 1 ppm (0.000001) you need 11 purge cycles. State of the art canning and bottling lines have about 50 ppb TPO or less.

That will use a boatload of CO2 for an empty keg, so the technique of pushing sanitizer out saves on CO2. If the head space is purged 5 times at 30 PSI, then the headspace will have about 1000 ppm O2. The headspace is small, so there is not a lot of waste for that process.

I hope this helps.

General Homebrew Discussion / La Cumbra Elevated IPA and Pitch Rate.
« on: June 29, 2015, 06:37:09 PM »
This was a wow beer for me almost two years ago. Excellent stuff, will try some more this fall when in NM.  ;)

He under pitches to get a faste fermentation. That seems counter intuitive, but if you read the article he uses the Chico yeast. It popped into my head that the Basic Brewing Radio experiment had faster krausen for dry sprinkled US-05 vs rehydrated (killed half the yeast but it started quicker). Mark V. - could his have something to do with the yeast genetics that you have been talking about for the Chico yeast (diploid)? Very curious here.

Nice IPA recipe. Might make something similar, using Galaxy in place of the South African hop.

Events / NHC 2016 Location
« on: June 10, 2015, 10:30:23 AM »
Baltimore. June 9-11.

The Pub / Dick Cantwell leaves ABInbev.
« on: April 13, 2015, 01:14:18 PM »
It appears the yoke was chafing, and he can follow his own desires.

The Pub / Water to a Grow Food and Make Beverages
« on: April 07, 2015, 09:12:29 AM »
It looks like beer is not as water intensive as feared. I don't know if the water for the hops and Barley are in this, but those are mostly not grown in CA.

Saw this on the book of face, John Palmer.

The Pub / Simplified BJCP Score Sheet
« on: April 01, 2015, 06:28:35 AM »
This should make things faster.

It is April 1, you know.   8)

The Pub / Oscar Blues Buys Perrin Brewing in MI
« on: March 27, 2015, 01:05:30 PM »
This was a surprise. We spent a very long day at Perrin last June sorting entries for the second round of NHC. Some of the beers were very good, some I was not so impressed with. The guy who started it made a large fortune manufacturing sports wear. Did he make his small fortune, and it was time to get out?  :D They had bought a Krones bottling line, but never used it as they did not have the brand identity to get shelf space. Kuhnhenn has that line now.

Going Pro / Keg Return Article on Mainpage
« on: March 10, 2015, 07:40:56 PM »
For you pro brewers out there, and words for someone wanting a keggle.

Other Fermentables / Mead in Michigan
« on: March 06, 2015, 07:49:14 AM »

Ingredients / Michigan Hops Farms Expanding.
« on: February 19, 2015, 09:06:18 AM »
Michigan is the #4 state for acres of hops grown, with a whopping 300 acres strung this year. If this goes through it will more than double that.

Homebrew Competitions / NHCompetition Registration is Open
« on: February 02, 2015, 07:30:04 AM »
You can register for the Competition today, select the number of entries, and judging center(s).

There is a glitch, in the primary judging center selection i made, it showed up as a different center when finished. Tried a second time, again a different city. Janis has been contacted.

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