Which type of service would most likely not utilize non-metallic vessels?

In assessing the types of service that typically involve non-metallic vessels, it's important to understand that these materials are often used for their resistance to corrosion, particularly in applications involving aggressive chemicals. Non-metallic vessels are commonly employed in corrosive services where traditional metals would be prone to degradation due to chemical reactions.

When considering pressure service, one significant factor is the performance and structural integrity required to handle various pressure levels. Non-metallic materials often lack the necessary strength and durability needed to withstand high pressures compared to metals. Therefore, pressure service usually relies on metallic vessels, which can provide the necessary mechanical strength and proven reliability.

Temperature-controlled service may utilize non-metallic vessels, as certain non-metals can maintain their integrity at various temperatures depending on the material properties. Similarly, conventional storage service can also utilize non-metallic options depending on what's being stored.

Thus, among the types of service listed, pressure service is least likely to utilize non-metallic vessels due to the requirements for strength and pressure resilience that non-metallic materials typically do not meet effectively.