I'm trying to stop using plastic in my brewing and tought that it was a good idea to "No Chill" in sanke kegs (type "S" spear) instead of my old HDPE containers. But I dont' know if the valve will hold the negative pressure that the no chilling process create.
The valve will let the outside air come in? Or maybe the keg will knead to the inside with the vacuum? Please report your experience doing that or tell me ways to make it safe.
I've been doing this for years but with the spear removed and a 2" tri-clamp fitting. Fermenting a no-chill IPA now!
I've done this once with second runnings with a corny keg. I filled the keg right after flame out, then placed into the cooler. Once chilled I transfered to carboy for fermentation. Had no negative effects on keg or beer. The pressure drop from contraction is so minimal the keg and valves are unaffected.
I guess if there was say 50% head space then the negative pressure might be enough to suck air in through valve. But that would be the worst of it. If concerned just put a sanitary air filter on the sanke valve.
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