Gas piping is commonly constructed of which materials?

The correct choice identifies materials that are most widely accepted and utilized in gas piping systems. Wrought iron, steel, and black pipe are specifically selected for their durability, strength, and capability to withstand high pressures associated with gas transportation.

Wrought iron offers excellent corrosion resistance and has been historically used in gas piping systems. Steel is also favored for its strength and ability to safely transport gas without leaking. Black pipe, which is actually a type of steel pipe coated with a black oxide finish, is commonly used for natural gas and propane systems due to its ability to prevent corrosion while maintaining a solid structural integrity.

This selection is critical in ensuring safety and compliance with regulations in gas installations. Other options, like plastic and copper, may be used in specific applications but do not provide the overall robustness and pressure ratings required for gas piping compared to wrought iron and steel. Similarly, aluminum, PVC, glass, and fiberglass are not typically acceptable materials for gas piping due to their limitations in strength, heat resistance, and structural integrity in high-pressure situations.