What characteristics must unlisted piping materials demonstrate before use?

Unlisted piping materials must demonstrate characteristics that ensure they are safe and suitable for their intended application. This requirement is essential because unlisted materials have not been evaluated by recognized standards or authorities for specific uses. Therefore, assessing their safety and suitability involves ensuring that they can withstand the operational pressures, temperatures, and chemical exposures they will encounter without causing failures, leaks, or other hazards.

When determining if a piping material is fit for use, considerations include its mechanical properties, compatibility with the fluids being transported, resistance to corrosion, and ability to handle environmental conditions. This thorough evaluation helps prevent accidents and ensures compliance with safety regulations.

Other characteristics such as strength, flexibility, weight, durability, cost, and efficiency might contribute to the decision-making process, but they are secondary to the fundamental requirement of safety and suitability in applications involving piping systems.