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Alphaacid
04-28-2017, 07:51 AM
If co2 reacts with caustic why not purge and pressurize with N2?

rdcpro
04-28-2017, 08:14 AM
If co2 reacts with caustic why not purge and pressurize with N2?

It wasn't in the brewing business, but I worked for a company that used LN2 for purging and similar uses like blowing dry parts that have been cleaned; anything you'd use an air compressor for. Big cryo tank, and a big vaporizer because we made gas purification equipment that worked with nitrogen (among other gases). I must have installed at least a mile of 2" stainless tube just to distribute nitrogen around the plant. If you buy a lot of it, liquid N2 is pretty cheap. If you buy it in VGL dewars, it's probably a lot more than CO2 (but I don't know the prices these days). I used to fill VGLs from the bulk tank so we could use it anywhere. You wouldn't want to use compressed nitrogen, though. That would be really expensive, I'd imagine.

Regards,
Mike Sharp

Alphaacid
04-28-2017, 08:34 AM
I have an N2 generator, so all it costs me is the electricity to produce it.

gitchegumee
04-29-2017, 11:28 AM
Many people do. Most opinions seem positive. There are limitations. Including finding good equipment! Good luck!

TL Services
05-06-2017, 10:36 PM
Nitrogen purging is very common in most of the major breweries here in the UK, with financial and environmental benefits.

There are no major drawbacks compared to CO2 purging regarding oxygen control; however there are a couple of important issues with running beer into N2-filled tanks:

1. Because the tank is full of N2, there will be CO2 losses from the incoming beer, especially at the start of filling. This can be compensated by over a carbonating initially;

2. A certain amount of N2 will be absorbed into the beer. This tends to be quite low level so doesn't cause any problems with later transfers, package filling and dispense.