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Thanks, vpl. My oxygen supplier uses copper encased in a PVC jacket with foam insulation blown in for all buried lines. Expensive, but I know it will work. Copper is actually the first choice in oxygen piping because it has no carbon and therefore adiabatic heat of recompression is not a...

You people don't have enough work to do.

Anyone ever used copper for this application. It appears to be readily available.

MJ Thank you for the reference. This is essentially the verbiage in the CGA code that sparked my initial question. I have found an in house expert that can do CP design and I have also found a suitable coating. It appears that carbon steel pipe (schedule 80) will be suitable because my velocity...

So, stars aside, I think I will be going with A106 coated with fusion bonded epoxy. This pipe will still need to be oxygen cleaned and I am talking to vendors regarding this. Thanks for all of your help.

Not medical. It is used for a pulse detonation boiler cleaning system.

Need to install a 2" underground oxygen pipeline. Pressure is 125 psi. The aboveground piping is SS304. Consulting engineer is recommending SS316 with an external coating. Is the coating required? Is cathodic protection required? If anyone has experience with a similar installation, advice would...