I'm not sure what you are asking for.
If you are asking about the people who use cutting torches, I have never heard of any safety certificates being required other than an employer must verify the person has the needed knowledge. If a private citizen, then he/she should read all supplied info and get training if necessary.
If you are asking about certifying a product for sale to the public, then you should contact State OSHA departments or similar offices. I would also talk to major welding supply companies to see what they know, especially since you might need a distributor anyway.
CHGuilford