Purging Oxygen from a Keg by Pressure Only - the calculations to determine time

[Unicorn_Platypus]

Do you know where you came up with the 3g amount? I have done this a few time, but I was not sure how much I should add. At RiteBrew, a 1 lb pack of PMB is under $6, so cost is not much of an issue.

With most of my 5 gal kegs, the dip tube angles into a small indentation in the center of the keg. These kegs leave very little solution behind. My 10L Torpedo kegs have more room from the end of the dip tube to the bottom. The dip tubes on the Torpedo kegs are already pretty short, but maybe I should try to trim them up a little more.

My Hazy IPAs seem to stay fresh for 2+ months in the keg (though they seldom last that long).

10ppm SMB eats up 2ppm O2 per my understanding

Bru'n Water has a SMB parameter and if I plug in 5.5 gallons for the volume with 150ppm that yields 3 grams

This would scrub 30ppm of DO which is plenty more than there would ever be in tap water.

If you are concerned about having more residual sanitizer than I do then you should probably cut the dose to 2 grams.

Mix the SMB in water first before adding too

 

[kohalajohn]

FWIW, the 439 liters of CO2 generated by a 40 point fermentation converts to 1.78 pounds.

That is very helpful

From that, it seems that a fermenting keg can fully purge a connected serving keg, I had thought that pushing through a keg full of sanitizer was required.

But maybe not.

I’m sure there will be controversy on this.

 

[doug293cz]

That is very helpful

From that, it seems that a fermenting keg can fully purge a connected serving keg, I had thought that pushing through a keg full of sanitizer was required.

But maybe not.

I’m sure there will be controversy on this.

doug293cz's epic post on CO2 generation

Brew on

 

[Bassman2003]

That is very helpful

From that, it seems that a fermenting keg can fully purge a connected serving keg, I had thought that pushing through a keg full of sanitizer was required.

But maybe not.

I’m sure there will be controversy on this.

It is one of those rare times when the more convenient method is actually a great option! You can trust the force.

My SOP is to sanitize the keg and transfer lines while I am sanitizing my fermenter on brew day. Get rid of as much sanitizer out of them as I can then close them up. Then everything is hooked up to the fermenter for fermentation. Once it is transfer time you just hook up and go.