Which of the following is commonly used as a safeguard against toxic releases?

• A. Double wall construction
• B. Ventilation
• C. Alarm system
• D. Fire suppression

Answer: (A)

Containment with a secondary barrier is a primary safeguard against toxic releases. Double wall construction adds an outer containment layer around the primary vessel, so if the inner wall leaks, the surrounding space and the outer wall capture the material rather than allowing it to escape into the environment. This provides a passive, built-in protection that reduces both the chance of a release reaching people or the environment and the severity of any release by giving time to detect and respond. Ventilation can lower air concentrations but does not prevent a release from occurring; an alarm system helps detect and speed up response but doesn’t stop the release itself; fire suppression protects mainly during fires and doesn’t address releases from non-combustion scenarios.