Which piping material is best suited for a clean steam system?

The best choice for a clean steam system is AISI 316 or 316 Ti stainless steel. This material is specifically designed to withstand high temperatures and pressures, making it ideal for steam applications. AISI 316 stainless steel offers superior corrosion resistance compared to other types of steel, especially in the presence of chlorides, which can be found in water systems. This corrosion resistance is critical in clean steam systems, as any leaching of materials can contaminate the steam and compromise the purity of the system.

Additionally, AISI 316 Ti is a variant that includes titanium for added stability and strength, particularly in elevated temperature environments. This makes it well-suited for applications where steam quality is of utmost importance, such as in food processing and pharmaceutical industries.

In contrast, other materials like Schedule 40 Carbon Steel are not appropriate for clean steam systems due to their susceptibility to corrosion and rust formation when exposed to moisture and steam. While AISI 304 is more corrosion-resistant than carbon steel, it lacks the enhanced properties of AISI 316, particularly regarding chloride resistance. Plastic piping, although lightweight and easy to install, cannot handle the high temperatures and pressures associated with steam systems and lacks necessary structural integrity.