What type of safety standards are concerned with the maintenance of pressure vessels in beer breweries?
There are many safety standards and regulations, which pertain to industry and industry specific to Brewing companies. The first type of standards to review is the OSHA general Industry 1910 standards, which pertain to equipment that Brewing companies would utilize. Another outlet to explore would be ISO and research those standards, which may in fact be more pertinent to the information you are looking for. Finally, another alternative would be to search The Beer Institute, which contains standards for the pressure vessels used in the brewing industry.