Bottling - Single vs Double Pre Evac

[ParishBrewingCo]

Can anyone with experience/knowledge explain the tangible benfits of a double pre-evac filler (in lieu of a single pre-evac) for a small craft brewery?

I know double pre-evac is supposed to result in better bottle purge, but I'm curious if a single pre-evac works just fine for anyone with no difference in DO in the bottle.

Thanks.

Andrew

[lhall]

I think that I have read that the general rule of thumb is that a single evac should remove about 92% of the air, a double evac about 99%.

[Alex T]

Hi,

In the most simple thinking:

short tube filller - double pre-evac is required due to the nature of how the bottle is filled - the beer gets thoroughly exposed to the gas in the bottle - so will pick up O2 very easily.

long tube filler - single pre-evac is fine as the bottle is filled from the bottom up, rather than running down the sides of the bottle like in a short tube filler. SMB (Germany) is one of a few manufacturers remaining that still use long-tube fillers; I believe they mainly produce smaller capacity fillers. Arguably the best way to fill beer.... (I don't know the history here; presumably long tube fillers were not able to handle high line speeds required nowadays????)

Cheers,

Alex

[ParishBrewingCo]

Thanks y'all. Great info.