Has anyone ever tried to deliver CO2 with a CGA 300 regulator? I know that a CGA 320 regulator is standard for CO2. The issue is that I currently do not have any free CGA 320 regulators. I also noticed that the threads for the CGA 300 and 320 are the same size, as shown here: https://www.concoa.com/cgachart.html . Moreover, the cylinder pressure of a 50-LB CO2 tank is ~860psi, which is well within the max pressure for the first stage of a CGA 300 regulator. The only difference I see is that inner thread of a CGA 300 is tapered, whereas the inner thread of a CGA 320 is flat. What is the worst that can happen? A catastrophic regulator failure and explosion, obviously. However, it would seem that is unlikely if the max pressure of the CGA 300 is less than the cylinder pressure and if the threads perfectly overlay. What do you think?
You *absolutely must* confirm the compatibility of the regulator you want to use - not only for pressure but also for reactivity, flammability, corrosion potential, delivery temperature, etc. of the gas in question. Safety needs to be your primary consideration - with compressed gases, shortcuts should never (repeat never) be taken.
Brian Karl Richards , I respect what you are saying. Here is the issue: In the lab space that I inherited, there were already two CGA 540 oxygen regulators connected to CGA 320 carbon dioxide tanks. We have observed no leaks or regulator failures in three months, and again these regulators were in use on these and similar cylinders for years before I arrived. I am a newbie on this, having always relied on house-supplied gas lines. I noted that my predecessor had used a shortcut, so I wondered if another shortcut were also possible.
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