What type of gas does the National Fuel Gas Code primarily address?

The National Fuel Gas Code primarily addresses natural gas and propane because these are the most commonly used fuels in residential, commercial, and industrial applications within the scope of its regulations. Natural gas is a widely utilized energy source for heating, cooking, and various processes, while propane serves similar functions in areas where natural gas supply is not available.

The code provides guidelines for the safe installation and operation of gas appliances, ensuring that systems relating to these fuel types are designed to minimize risks such as leaks, explosions, and carbon monoxide poisoning. By focusing on natural gas and propane, the code aims to standardize practices that prioritize safety and efficiency, reflecting their prevalence in fuel consumption across various sectors.

Other options, while they do relate to gaseous fuels, do not fall under the primary scope of the National Fuel Gas Code. Butane and methane, for example, are specific hydrocarbon gases that might be relevant in certain contexts but are not the primary focus of the code. Similarly, hydrogen and acetylene serve very different applications, often in industrial or laboratory settings, and are not covered by the same safety practices as natural gas and propane. Coal gas and biogas are also not central to the code's provisions, as they are less commonly used in contemporary applications compared