Which type of gas piping is permitted when the gas has low hydrogen sulfide content?

• A. Steel piping
• B. PVC piping
• C. Copper and brass piping
• D. Polyethylene piping

Answer: (C)

When considering the appropriate type of gas piping for use with natural gas containing low levels of hydrogen sulfide, the correct choice is copper and brass piping. Copper and brass possess good resistance to corrosion and can handle various gases, including those with minor amounts of hydrogen sulfide.

Copper is particularly favored in gas applications because it has excellent durability and can withstand the potential corrosive effects of hydrogen sulfide. Additionally, brass, which is an alloy of copper and zinc, also shares many of these corrosion-resistant properties. This makes copper and brass piping suitable for environments where there may be exposure to gases containing low hydrogen sulfide levels, as they can maintain structural integrity and safety over time.

Other types of piping, such as steel, PVC, and polyethylene, are not optimal for this specific scenario. Steel can be susceptible to corrosion when exposed to hydrogen sulfide, while PVC does not have the necessary strength and durability for gas applications. Polyethylene, while more resistant to certain chemicals, is not typically used with gases containing any level of corrosive agents like hydrogen sulfide, even in low concentrations.