In severely corrosive atmospheres, what material requirement applies?

• A. Standard materials are sufficient.
• B. Special corrosion-resistant materials or coatings shall be used in severely corrosive atmospheres.
• C. Only protective paint is required.
• D. No corrosion protection is necessary.

Answer: (B)

Severely corrosive environments demand materials that can withstand chemical attack; standard construction is likely to degrade quickly and compromise the integrity of the clean agent system. The best practice is to specify special corrosion-resistant materials or apply protective coatings that form a durable barrier against the corrosive agents, keeping leaks and degradation at bay and ensuring the system remains effective over its service life. This approach directly addresses the environmental challenge and why the system must be protected, rather than relying on ordinary materials or surface paint alone, which do not provide lasting protection in harsh atmospheres.