micblair said:
Not cleaning (bright) tanks between fills is common practice in commercial breweries, particularly for bright filtered beer.
Saves time on cleaning, conserves CO2 not having to blow down a whole tank, and also energy re-equillibrating several hundred kilos of stainless back to ambient after a hot CIP.
I would like to clarify this.
There are different intensity levels for a CIP. Flavour changes ALWAYS require a clean, but this is usually a rinse/basic clean. Cleaning/sanitising involves longer cleans with more steps.
Bright beer tanks (BBTs) are not always cleaned between fills because they:
a) Are often filled with the exact same brew coming out of maturation/filtration at a different time
b ) The time between BBT fills is hours, not weeks/months like in the keg situation
c) The beer is pasteurised before/after bottling (depending on the arrangement), so combined with point b ), there is not much chance for an infection to take hold
Kegs, on the other hand, are thoroughly washed and steam sanitised before filling, every time.
Personally, I'd be very apprehensive and worried if I did not clean it. 5 mins of my time = peace of mind.