COnical air bubble

[KRUT]

Greetings all,
I have a question. I am brewing a 500 Liter batch of an American Brown Ale which is now in the Cold crashing phase. Yesterday as i was pulling a sample off of the side port of the conical a small air bubble
made it´s way into the conical and just so slightly bubble to the top . I understand the vacumm effect that cuased this. Given that we are always trying to keep oxygen out of the picture after fermentation as stopped. Does this little air bubble pose a big treat to the brew? The beer was sitting at 2C when it happened. OG 1.061 now to 1.017. I used Safale 04 and fermented at 18C for ten days before pulling the yeast.
Thans for any wisdom that i may recieve.

Cheers

[ajdelange]

Greetings all,
I have a question. I am brewing a 500 Liter batch of an American Brown Ale which is now in the Cold crashing phase. Yesterday as i was pulling a sample off of the side port of the conical a small air bubble
made it´s way into the conical and just so slightly bubble to the top . I understand the vacumm effect that cuased this.

I don't. Fermenters of that size are almost always equipped with a pressure releif valve and vacuum breaker. It is too easy to forget to purge the CO2 before shooting caustic in there for CIP. This can collapse a fermenter not equipped with vacuum release.

Given that we are always trying to keep oxygen out of the picture after fermentation as stopped. Does this little air bubble pose a big treat to the brew?

Not sure I'd call it a treat. In some brewing practice air is introduced later in the fermentation in order to keep ester formation going a little longer but that's pretty much limited to certain British beers.

Or was that a typo - did you mean "threat"? If so I wouldn't think a small amount of air would have much effect especially as it is an ale in question. Yeast keep fermenting wort in a reduced state and a small amount of oxygen would be quickly absorbed by them. A small shift of metanbolism would take place for the cells involved but as long as the amount of air sucked in was small, the effect should be minimal.