Mixing two batches

[Frodv]

I have a question about mixing two or three batches of the same type of beer.
Let's say I have a 300 liter tank that I store a 100 liter batch of beer in that have been sitting for a couple of months. If I brew another 100 liters of the same type of beer, can I mix these two batches in that one 300 liter tank?
And can I repeat this process in another couple of month to fill up the tank?

 

[day_trippr]

Welcome to HBT! Is this a trick question?

The second addition would be a tight fit, but let's say the volumes were all accurate.
You'd need a way to assure a full blend - without oxidating the crap out of the whole thing.
And wrt oxidation - hopefully that first 100 liters isn't oxidized already. 100 liters in a 300 liter vessel is hella big head space that would need a lot of purging with CO2 to not screw up the beer over that much time...

Cheers!

 

[Frodv]

What about storing the first 100 liters in a 100 liter keg, the same with the next 100 liters, and when the last 100 liters is ready to be kegged, I mix all three in a 300 liter keg. All transferred with CO2.

 

[day_trippr]

Much better plan!

If you can completely fill each 100L vessel with sanitized water then push that out with CO2 before then filling the vessel with beer you'll have done all you can to minimize oxygen exposure...

Cheers!

 

[bleme]

What about storing the first 100 liters in a 100 liter keg, the same with the next 100 liters, and when the last 100 liters is ready to be kegged, I mix all three in a 300 liter keg. All transferred with CO2.

That would be ideal, especially if you can figure out a way to do a closed system transfer. If you can do that though, you could just fill the 300 liter tank with sanitizer, push out with CO2, and not bother with the 100L tanks. Since you are making the same recipe, they should all be close to the same gravity and will mix on their own. Theoretically, using this method you could pull off and refill as needed indefinitely.