How many grains of hydrogen sulfide can gas contain before copper and brass pipe should not be used?

The correct answer indicates that gas can contain up to 0.3 grains of hydrogen sulfide per 100 standard cubic feet before the use of copper and brass piping becomes a concern. Hydrogen sulfide is a corrosive compound that can react negatively with copper and brass, leading to accelerated deterioration of these materials.

When gas contains hydrogen sulfide above this threshold, the potential for corrosion increases significantly, resulting in risks such as leaks or system failures. Therefore, guidelines and codes recommend limiting the concentration of hydrogen sulfide in natural gas to protect infrastructure and ensure safety. Maintaining this limit is crucial for the longevity of gas piping systems made from these materials.