Ignoramus8503 wrote:

On 2013-01-09, mike wrote:
On 1/8/2013 4:59 PM, Pete C. wrote:

Erik wrote:

For the record, there are different grades of O2 as well.... welding,
medical& aviators breathing Oxygen.

Yes, no, maybe...

The reality is there are different labels, but all are filled from the
same cryo tank and thus the medical and aviator grades have the same
higher purity of the welding grade even if the label lists the lower
standards of medical or aviator grades. Only the analytical grade gets
special treatment. This may well not have been true in decades past, but
today what's in the cryo tank is ultra pure and meets all the standards.

Wouldn't be hard to convince me that it's true.
But that's only part of the equation.

We don't have many unicorns and rainbows where I live.
In my world, I'd like my beverage CO2 supplier to have at the least
the facade of proper handling for food-grade stuff.

This will never be an issue for CO2...until it is.
Be as macho as YOU like.

The gas may be the same, but food grade also implies better handling,
for example, the hoses would not be lying in oil and dirt etc.

i

FYI: I've sucked down pure welding grade O2 at 60' depth equivalent
pressure in a hyperbaric chamber with no issues.