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D9, please.

Not to get too pedantic, but you are assuming the yeast slurry has a density of 1 gram/ml. According to Wyeast, a “typical” 40% yeast slurry has a density of about 1.1 g/ml.

I think this analysis applies only to a sealed starter flask. However, if your starter flask uses a permeable foam stopper, or is simply loosely covered by foil as many people do, gas kinetics will ensure that ~21% of the air in the flask will be O2 throughout the entire process (the CO2 barrier...

I think you mean oxygenate.

This is not my experience. The one pro-am brew I did, they used in-line oxygenation after a single-pass through the plate chiller. This was only a one bbl batch, but I was under the impression that they used the same process on their production system.

This is really cool, thanks for sharing this Bobby. The journal article Bobby links above discusses preoxygenation of the yeast slurry in the absence of maltose (using some complicated apparatus that I don’t fully understand). Unfortunately that means their results don’t directly indicate what...

I second the suggestion to call your water department. My local city water changes significantly between winter and summer, because the water department avoids using the wells that need expensive pre-treatment during the (lower demand) winter season. Given that CC's water is all surface water, a...

I have a Milwaukee MW 102. I haven't calibrated mine in probably two years. I just checked and it's off by less than 0.1, which is plenty of accuracy for my purposes. Your mileage may vary.

lg usually refers to log_10, or base 10 logarithm. pH is defined as the negative base 10 logarithm of the concentration of hydrogen ions (aka protons).

If you are adding just zinc, it's hard to imagine you could taste it. The recommended dosage is only 300 ppb. https://www.homebrewtalk.com/threads/zinc-usage-amount-for-healthy-fermentation.732186/

The outlets shown in post #10 above are NEMA 6-20. These should be wired to 240v (not 120 as they were originally) and protected by a 20A breaker (not a 30A breaker).

The book Wood & Beer by Bouckaert and Cantwell isn’t a primer, exactly, but the best introduction that I found. https://www.amazon.com/Wood-Beer-Brewers-Dick-Cantwell/dp/1938469216?dplnkId=c8a7a703-cb1f-4346-ba86-23218ab5b881&nodl=1

If your tank leaks, it should leak equally as much under negative pressure as under positive pressure. All of your seals are symmetric. The only one-way device is your Spunding valve, but that shouldn’t be leaking.

Not sure what this was supposed to link to, but I get a permissions violation.

Want to test out your sparkly new plate heat exchanger (HX) in your new (still unplumbed and unfinished) basement brewery space? Need a jumper to connect your garden hose to your HX? Why? Because you have camlock QDs on your new HX, but you forgot to order another camlock QD for your Steam...

Answering my own question, it appears that Deutsche Beverage Parts in Charlotte sells gaskets for 3/4" piping and 1.5" TC flanges, in both silicone and EPDM.

I'm reading that EPDM has very poor resistance to many oils. These parts were all new and I'm not sure how thoroughly I cleaned them before assembly. I did do a very thorough clean-in-place before brewing, but I am wondering if this problem could have been caused by some residual machine oil on...

That’s what I thought. But this is an electric rig. Maybe these aren’t really EPDM?

I’m not looking for never disassembling, but I am hoping for not always disassembling. This is all on the hot side, so perfectly clean isn’t strictly necessary.

No, I had bought a couple of boxes of 25 on Amazon a while back. They claimed to be FDA approved EPDM, but now I’m wondering if that was so. This may be another example of me being penny-wise and pound-foolish. Next time I’ll probably get them from you. Is there an easy test to check if they...