A release that lasts from several seconds to several minutes because of a broken or damaged valve is best described as which type of release?

• A. Spill
• B. Rapid relief
• C. Detonation
• D. Violent rupture

Answer: (B)

When a container has a broken or damaged valve, the opening lets gas escape at a high rate for a period of time as the pressure vented through the leak. This ongoing venting, lasting from seconds to minutes, is called rapid relief. It describes the situation where the release isn’t an instantaneous explosion, but a sustained discharge as the valve cannot seal and the contents vent until the pressure drops.

This differs from a spill, which is typically a liquid flowing out rather than a gas vent through a valve. It also differs from a detonation, which is an explosive, almost instantaneous release, and from a violent rupture, which is a catastrophic break of the container causing a violent, explosive release. The duration and mechanism here—continuous venting through a damaged valve—fit rapid relief.