Cold Wall equipment refers to equipment that is protected by what?

• A. Refractory
• B. Water cooling
• C. Insulation only
• D. No protection required

Answer: (A)

Cold Wall means the equipment is protected by a heat-resistant lining that keeps the outer surface cooler while withstanding high process temperatures. This protection comes from a refractory lining, which is applied to the interior surfaces to block heat transfer to the vessel’s shell. Refractory serves as a durable barrier against extreme heat and thermal shock, helping maintain structural integrity and safer handling.

Water cooling is an active cooling method and isn’t the definition of Cold Wall protection. Insulation alone provides thermal resistance but doesn’t offer the same combination of high-temperature durability and protection for the outer shell that refractory lining delivers. No protection would expose the outer wall to excessive heat, which isn’t appropriate for high-temperature equipment.