[Phil_M]

Does anyone know the purity of typical welding shop CO₂?

[denny]

True, but I can't help and think that breweries are also going to want to set themselves apart from the rest as much as they can. Might not be a bad way to do it.

Remember, it's a business  It's as much or more about selling beer as making beer  A costlier process in terms of energy and labor makes the selling that much more difficult.

[denny]

Does anyone know the purity of typical welding shop CO₂?

In terms of...?

[dilluh98]

Does anyone know the purity of typical welding shop CO₂?

I doubt it's the two 9s apparently required in the post above.

[natebriscoe]

Does anyone know the purity of typical welding shop CO₂?

Pretty sure it varies and no welding supply could tell you for sure. Probably in the 98-99% range, which is far less than perfect.

[denny]

Does anyone know the purity of typical welding shop CO₂?

Pretty sure it varies and no welding supply could tell you for sure. Probably in the 98-99% range, which is far less than perfect.

Do you have a source for that?

[dilluh98]

I would guess that local welding supply CO2 not up to snuff according to the previous "nugget" post. Why? As a research chemist, the cost of the gases we use goes up by quite a margin each extra 9 you want to the right of the decimal. Two or three 9s is an order of magnitude (or more) costlier than "98-99%." 98-99% is likely good enough for most welding applications - I doubt they're willing to pay the premium.

[The Beerery]

Which is another reason you recapture your own from fermentation (spunding in one form or another, basically pure) and get the best you can for dispensing only(and consume moderately fast). All modern brewhouses will more than likely capture fermentation co2, re-condense it into liquid co2, and use it though out the brewery.

[natebriscoe]

Does anyone know the purity of typical welding shop CO₂?

Pretty sure it varies and no welding supply could tell you for sure. Probably in the 98-99% range, which is far less than perfect.

Do you have a source for that?

I work for a auto repair/welding supply Shop and have discussed with our suppliers several times, no one seems to have any real specs. That is the best I can get out of them. I will say that using tank co2 to force carbonation a low oxygen beer will knock out all that low o2 character real fast! So enough o2 to bring a beer above 1ppm DO when force carbed.

[The Beerery]

Does anyone know the purity of typical welding shop CO₂?

Pretty sure it varies and no welding supply could tell you for sure. Probably in the 98-99% range, which is far less than perfect.

Do you have a source for that?

I work for a auto repair/welding supply Shop and have discussed with our suppliers several times, no one seems to have any real specs. That is the best I can get out of them. I will say that using tank co2 to force carbonation a low oxygen beer will knock out all that low o2 character real fast! So enough o2 to bring a beer above 1ppm DO when force carbed.

Thats correct, and now we know from my previous post why that is... The malt phenols are antioxidants, when you use those up, you lose fresh malt flavor. 

[Phil_M]

This all jives with the British method of carbonating in a cask, even when bottling. Different method from spunding, but should have the same result.

[denny]

Which is another reason you recapture your own from fermentation (spunding in one form or another, basically pure) and get the best you can for dispensing only(and consume moderately fast). All modern brewhouses will more than likely capture fermentation co2, re-condense it into liquid co2, and use it though out the brewery.

ALL?  Not a single one I deal with regularly does that.  Some might, but as far as I can tell, more don't.

[The Beerery]

Which is another reason you recapture your own from fermentation (spunding in one form or another, basically pure) and get the best you can for dispensing only(and consume moderately fast). All modern brewhouses will more than likely capture fermentation co2, re-condense it into liquid co2, and use it though out the brewery.

ALL?  Not a single one I deal with regularly does that.  Some might, but as far as I can tell, more don't.

Sorry modern German Macro Brewhouses, plenty of diagrams in Kunze.

[denny]

I work for a auto repair/welding supply Shop and have discussed with our suppliers several times, no one seems to have any real specs. That is the best I can get out of them. I will say that using tank co2 to force carbonation a low oxygen beer will knock out all that low o2 character real fast! So enough o2 to bring a beer above 1ppm DO when force carbed.

Thanks, appreciate the info.

[denny]

Sorry modern German Macro Brewhouses, plenty of diagrams in Kunze.

Thanks.