Recent content by segallis

Can aluminum pipe be used with duotight fittings? I read that copper can be used, so aluminum seems possible. I need 1" to connect a spunding valve to a ball lock. I don't wanna pay $10 shipping for a 95 cent tube, Plus I like the idea of a rigid pipe connecting the two so it doesn't flop...

As I think about it even more... it seems that even with a TC butterfly valve, it will never be a good idea to dump trub or harvest yeast after anything more than a few PSI has built up in the fermenter. I'm picturing holding my thumb over the mouth of a shaken soda bottle. :eek: So when do...

Good point, I never thought of the air in the empty bottle! So then it seems even with it installed from day 1, you would never really remove it to dump the trub or harvest yeast, else you would again have an empty bottle? So you get 1 fill of the bottle and it must sit there for 3 to 6 weeks...

I just picked up a 15.8 Gal Ferment King Unitank since there was a huge sale. I have a SS 1/2 BBL conical, but I wanted to try pressurized fermentation (plus I really miss seeing what's going on during fermentation). I am debating on fitting with a 2" Tri-Clamp elbow and butterfly valve, or...

Moisture will affect the weight of 5 gals uncrushed. The crush as well whether your squeeze a bag or push down on the bucket will affect the weight of 5 gal crushed. On more than one occasion I have weighed it out and I get 22.5 to 23.5 lbs per 5 gals I crushed. I see about 25% to 30% more...

I do enjoy an exercise like this, and really plan to do the 2 keg experiment, measuring dissolved O2. But I do all this only for the challenge and to have accurate data. Truth is, I have very little concern about oxidation (due to hoses, o-rings ) being a significant factor in my beer...

Ya, I got carried away with my slashes, including partial pressure in a few places I should have omitted it. So that raises an interesting point. Take the example of a CO2 supply regulated at 15 psi over ambient. Even though the equalized O2 concentration is half that (10.5%) of ambient air...

Finally, some science to prove I am wrong... and right :p And the answer is: A keg that is left at ambient pressure and has a hose or gasket that is permeable to air, will EVENTUALLY* contain 21% oxygen inside. A keg that is pressurized and maintained to 15 psi with a continuous supply...

Now this is something I can try. If I take a latex balloon and put it inside a mylar balloon, then fill the latex ballon with air and seal it. Then fill the mylar balloon with helium. You're saying I will see the latex ballon expand - or at least not deflate? Or possibly deflate slower than...

I was actually thinking of a balloon filled with air or CO2. A balloon filled wth CO2, will experience a positive partial presssure for Nitrogen (as one component) from the outside, i.e. a gradient pointed inward. So Nitrogen would tend to permeate into the balloon due to random motion (the...

Hmmm, I'll type slower this time... What fairy tale? I cited the actual definition of partial pressure. And that the partial pressure in a mixture results from random movement of molecules. The primary factor that enables a plane to fly is the angle of attack of the wing, rather than its...

Or the possibility that some are believing something that isn't true and regurgitating it with nothing to prove it. A law of physics is explained with facts and backed by empirical evidence - as opposed to, say, an old wives tale. What specifically did I say that is not true? Show me a...

Not to go too far down a bunny trail, but the exchange of gases inside the lungs is a gas-to-liquid transfer across a membrane, and does not involve much pressure difference (the pressure difference existes to move air in and out of the lungs). If anything there would be higher pressure in the...

If O2 diffuses into a pressurized CO2 line, then it would seem the same could be said for fermentation purging of a keg over time. Wouldn't O2 permeate through the blowoff water and tube walls and then along that open channel inside the tube back into the keg, so that the keg is being...

Hmmm, what I see are statements that "partial pressure" describes the contributions of individual gas components on the combined pressure of a mixed gas (usually relating the two for a specific absolute pressure). I don't see any formula (or experiment) that demonstrate this given a continually...