Which of the following is a safeguard to minimize toxic releases?

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

Answer: (C)

Safeguards to minimize toxic releases rely on providing a barrier that prevents or limits escape from the system. Double wall construction creates a second containment barrier around the vessel, with an interstitial space between the inner vessel and the outer wall. If the inner vessel fails, this outer layer catches the contents, reducing the amount released to the environment and often allowing early leak detection and response. In effect, it directly limits the potential release, which is the key idea here.

Other options address related protections but not as directly to preventing release. Diking helps contain spills on the surface and prevents them from spreading on-site, but it’s not integrated with the equipment as a primary containment feature. Ventilation lowers concentrations in the surrounding air and helps protect people, but it doesn’t stop the release from occurring. Fire suppression mitigates consequences after a release has ignited but does not minimize the initial release itself.