As everyone knows, the 2018 edition includes Oxygen Concentrator as a source of oxygen to feed the pipe network.

One of the things I do not see described is the quality of the air required or what technology is allowed to be used, Oilles, oilfree, etc.

Do you know of any requirement established in this regard?

Jose,  There are no requirements because there is no need for them.  I know this seems paradoxical but it has to do with the sieve materials in the concentrator. Long story short, the sieve is such that it will catch everything which is of concern (oil, hydrocarbons, CO, CO2, SO2, etc, etc., and in fact water vapor too.)  This is why you sometimes see these units hooked directly to the compressor with no dryer and very little filtration, yet they will initially at least produce Oxygen 93 USP.

Initially is the keyword there - over time, these things will also poison the sieve and ruin it.  Good feed air is the key to a long life for the concentrator, so oil free compressors and good air treatment to remove all the oil, oil vapor and the bulk of the water is wise.  Naturally it is also more cost, and many owners are hoodwinked into believing they are going to save money by vendors who cut these corners to lower the initial investment.  Naturally, the price is paid in early failure and frequent sieve replacement ($$$).   That is why there are a lot of abandoned concentrator installations around the world.  

More in the attached.  It's a little old now (written before the NFPA came out) but should help you understand "what it's all about".

Mark Allen wrote:

Jose,  There are no requirements because there is no need for them.  I know this seems paradoxical but it has to do with the sieve materials in the concentrator. Long story short, the sieve is such that it will catch everything which is of concern (oil, hydrocarbons, CO, CO2, SO2, etc, etc., and in fact water vapor too.)  This is why you sometimes see these units hooked directly to the compressor with no dryer and very little filtration, yet they will initially at least produce Oxygen 93 USP.

Initially is the keyword there - over time, these things will also poison the sieve and ruin it.  Good feed air is the key to a long life for the concentrator, so oil free compressors and good air treatment to remove all the oil, oil vapor and the bulk of the water is wise.  Naturally it is also more cost, and many owners are hoodwinked into believing they are going to save money by vendors who cut these corners to lower the initial investment.  Naturally, the price is paid in early failure and frequent sieve replacement ($$$).   That is why there are a lot of abandoned concentrator installations around the world.  

More in the attached.  It's a little old now (written before the NFPA came out) but should help you understand "what it's all about".

Thanks Mark very helpful your information, I had an idea about the topic but your comment and paper give me a complete view of it !!