That makes sense. (Wow, I don't say that very often about codes and standards.) The flame and temperature of the boiler would make the instrument classification ratings moot.
Thanks for your help!
OSHA 1910.399 gives definitions for hazardous classification of areas. (This would apply only to general industrial settings, so home water heaters, etc. would be exempt.) Unless there is an exemption for natural gas or steam generation, it would appear, from this definition, that...
OSHA regulations seem clear that if a flammable gas is present in the piping, an area must be Class I, Div 2. However, our steam boiler area (natural gas feed) is not a classified area. When I asked our EE about this, he said that all steam boilers are sold with general purpose instruments...
