What type of pipe material does the Chlorine Institute recommend for carrying liquid or dry gaseous chlorine under pressure?

The Chlorine Institute recommends using Schedule 80 steel for carrying liquid or dry gaseous chlorine under pressure primarily due to its strength and resistance to the corrosive nature of chlorine. Steel, particularly in the Schedule 80 configuration, provides a higher pressure rating and thicker walls compared to other materials, making it a suitable option for handling chlorine gas safely.

Additionally, steel is capable of withstanding the potential stresses and impacts associated with chlorine transport, which is critical given the gas's reactivity and potential hazards. The use of steel also facilitates reliable welding and fabrication, making it easier to construct systems that can endure demanding operational conditions.

In contrast, alternatives such as Schedule 40 PVC, fiberglass, and polypropylene may not offer the same level of pressure resistance or may have limitations in terms of compatibility with chlorine gas, leading them to be less favored for this specific application. Hence, Schedule 80 steel stands out as the recommended choice for ensuring safe and effective chlorine transport.