HOMEBREW Digest #5534 Tue 31 March 2009

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  Sparge Arms [SEC=UNCLASSIFIED] ("Williams, Rowan")
  Re: Scottsdale, AZ brew pubs (zac boak)
  StarSan 5.2 ("A.J deLange")

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---------------------------------------------------------------------- Date: Tue, 31 Mar 2009 14:40:56 +1100 From: "Williams, Rowan" <Rowan.Williams at ag.gov.au> Subject: Sparge Arms [SEC=UNCLASSIFIED] Thanks everyone for taking the time to reply re my question of sparge arms. There was a lot of good sensible advice in the replies and PM's that I received so it's great to know that the knowledge is still being shared. What's also interesting to note is that the days of ordering locally for a particular sparge arm to, er, phil the mashtun with sparge water are apparently gone! I asked the usual suppliers and have been advised that they're no longer getting them in wholesale. Fortunately, the aussie market forces have had an impact and an aussie supplier has 24cm and 32cm diameter copper rings in stock, just like the one's you suggested David, complete with the holes on the upper side of the ring! And freight is nowhere near as nasty... Cheers, Rowan Canberra Brewers Club, Australia [9588.6, 261.5] AR (statute miles) - ---------------------------------------------------- If you have received this transmission in error please notify us immediately by return e-mail and delete all copies. If this e-mail or any attachments have been sent to you in error, that error does not constitute waiver of any confidentiality, privilege or copyright in respect of information in the e-mail or attachments. Return to table of contents
Date: Tue, 31 Mar 2009 06:14:39 -0700 (PDT) From: zac boak <boakis2000 at yahoo.com> Subject: Re: Scottsdale, AZ brew pubs Hi everyone. I lived in Chandler, AZ for a few years. Chandler is south of Scottsdale on the 101 freeway by about 15 miles or so if my memory serves me correctly. There are a few good places to go. First off there is a brew pub called "Rock Bottom" right in Scottsdale. Good food and beer. It is a chain, but not all of them serve the same beers as they each have their own brew master. You can become a member of their "Mug Club" for free and then you receive a 1/2 liter instead of a pint for no extra charge, and you collect points towards free beer, food, and merchandise. Another place that i would recommend is in Tempe. I think they might even have a location in Scottsdale now, but i cant remember for sure. Its called "Four Peaks." They have a good selection of beer, and there is nothing wrong with the food either. I can recommend the "Kilt Lifter Scotch Ale"(very tasty) and the "Hop Knot IPA." Both excellent brews, just depends on what you are in the mood for. One last place i would check out is called "San Tan Brewing Company." They are located in Chandler, so it may be a little bit of a drive depending in where you are is Scottsdale. I lived in Chandler and worked in Scottsdale and the drive never killed me. Back to beer. They have quality beer and food. Although you may find it similar to Four Peaks since the man who opened San Tan was the brew master there. Hope this helps. They all have web sites that you can find through google. I put links in the first time I wrote this not knowing that, that was a "no no." Slainte Zac Boak Gristulin Brewing Brookfield, WI Return to table of contents
Date: Tue, 31 Mar 2009 16:18:30 -0400 From: "A.J deLange" <ajdel at cox.net> Subject: StarSan 5.2 In yesterday's digest I supposed (as did Calvin) that StarSan 5.2 must be a phosphate buffer and indeed several websites/catalogues describes it as "A proprietary blend of food-grade phosphate buffers...". I also noted in my post of yesterday that phosphate would be a poor choice of buffer at pH 5.2 because 5.2 is 2 pH units from the second pK of phosphoric acid and buffering capacity is low if this difference is greater than 1 unit. I spent some time doing some calculations and was so surprised at how poor buffering performance of the traditional phosphate buffer is that I felt I had to experiment to see if my model (in the spreadsheet I use) was valid. It appears it is. The following are some results from the calculations. I can do lots more 'gedenken' experiments in an hour with a spreadsheet than I can real experiments with a balance, a pH meter and glassware (and I don't have to clean up afterwards). At a rate of 11 grams per 5 gallons a traditional phosphate buffer designed for pH 5.2 will show in increase in pH to 6.11 (shift of 0.91) in water, not mash, in response to a challenge of 40 mg/L bicarbonate (this corresponds to an alkalinity of 34 ppm as CaCO3 in a pH 7 water). The way this might be interpreted in a mash is that if your water has alkalinity of 80 with effective (calcium plus half magnesium) hardness of 40*3.5 = 140 then the residual alkalinity would be 40 mg/L (80 mg/L minus the 40 mg/L acid released when the calcium reacts with malt phosphate) which the buffer (or another source of acid) would have to neutralize to get to a pH in the right range. It certainly would appear that 11 grams/L of a traditional phosphate buffer isn't going to do this. We'd expect the mash pH to be over 6 in this example. So perhaps StarSan 5.2 isn't a phosphate buffer. It is interesting that a citrate buffer of the same strength (4.5 mmol/L) would hold pH to 5.37 against the same 40 mg/L bicarbonate challenge. This is to be expected as the difference between 5.2 and the second pK of citric acid is only 0.43. Another thing which seems a little strange is the concept of buffering a solution with a phosphate buffer when the solution itself already contains a lot of one of phosphate (Calvin mentioned this). I'm not suggesting that Star San in really citrate as I would expect that to have noticeable flavor effects on beer made with it. Maybe the word "proprietary" bears significance which escapes me. I guess the next step is to actually go buy some of this stuff, hit it with bicarb and see where the pH goes. I'll report what I find. A.J. Return to table of contents
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