[a10t2]

Looking at the table here, it appears that ambient air pressure is pretty close to that differential at 10,000 feet.

That's what he's saying: my ambient air pressure is about 70% of that at sea level. To replicate my fermenter pressure at sea level you'd have to pull a 5 psig vacuum.

Hopefully I'll have some data on this in the coming weeks/months.

[HoosierBrew]

I recently made a Helles at the Green Dragon and the Peltier Chips failed on the chillers. As a result, the WL835 German Lager X fermented out at ~75*F, no pressure.  The resulting beer, that I call "Helles?" is surprisingly clean and true to intent. A touch of ester but nothing like I was expecting. 

Yep. The first couple years I brewed were on a shoestring college budget, so I brewed in rubbermaid tubs with frozen water bottles for temp control. So I brewed several 2124 lagers managing temps this way. I was surprised how well the beers came out. Not quite like a freezer with a Ranco, but there is some room for error with that yeast.

[toby]

That's what he's saying: my ambient air pressure is about 70% of that at sea level. To replicate my fermenter pressure at sea level you'd have to pull a 5 psig vacuum.

Hopefully I'll have some data on this in the coming weeks/months.

I suppose I misunderstood what he was saying.  I was assuming we were talking about pressurizing to 1 bar above ambient pressure effectively.  And that it was going to be a matter of pressurizing to 0.7 bar above ambient instead to get the same effect at higher altitude.

[brulosopher]

Looking at the table here, it appears that ambient air pressure is pretty close to that differential at 10,000 feet.

That's what he's saying: my ambient air pressure is about 70% of that at sea level. To replicate my fermenter pressure at sea level you'd have to pull a 5 psig vacuum.

Hopefully I'll have some data on this in the coming weeks/months.

Planning xBmt, need to know if a Dyson will do the trick?

[a10t2]

Planning xBmt, need to know if a Dyson will do the trick?

As long as you can seal it to the headspace and have an adjustable VRV I don't see why it wouldn't work to pull *some* vacuum. I'd be kind of surprised if it was able to do 5 psi, but who knows?

[brulosopher]

Planning xBmt, need to know if a Dyson will do the trick?

As long as you can seal it to the headspace and have an adjustable VRV I don't see why it wouldn't work to pull *some* vacuum. I'd be kind of surprised if it was able to do 5 psi, but who knows?

I'm the worst comedian ever. You really think a vacuum cleaner might work? Hmm.

Your sticker is proudly stuck to my yeast fridge.

[a10t2]

I'm the worst comedian ever. You really think a vacuum cleaner might work? Hmm.

I use one with a toy-inflator attachment to prime my March pump, and blow out my lines, so you never know. That's actually a 12 V car-sized one, even.

Your sticker is proudly stuck to my yeast fridge.

I am most humbled.

[brulosopher]

I am most humbled.

[mabrungard]

Hey! I just put my 2MBC sticker on my fermentation chamber too!

[hopfenundmalz]

Somehow I did not return with a 2MBC sticker. Maybe I can pick one up driving through in October?

[a10t2]

Somehow I did not return with a 2MBC sticker. Maybe I can pick one up driving through in October?

An oversight, I assure you. If you can make it to Leadville, I'll see to it that you get a sticker. Possibly even a pint or few, but no promises.

[brewinhard]

What about the case of fermenting at under one bar? Sean is opening his place and will be fermenting at 0.7 bar due to his 2 mile elevation (Leadville, CO). He tells me that he routinely observes higher than typical attenuation with his ferments at that elevation. I found this to be a curious result.

Hey, I know that when I am under pressure, I too tend to work harder...Just saying. 

[denny]

Somehow I did not return with a 2MBC sticker. Maybe I can pick one up driving through in October?

Yep, me either.  Guess I'll have to take a road trip!

[mchrispen]

I missed meeting you as well Sean... not sure how. Wanted to thank you for the awesome website - especially the refractometer stuff! Maybe out that way later this summer... so... and my initials MBC - hell yeah