Virginia VDFP HazMat Awareness And Operations Practice Test

When a container is subjected to repeated internal pressure, tiny flaws in the metal can start to grow with each cycle. If the pressure continues to push on that growing crack, the crack can propagate very quickly—almost by itself—leading to a rapid, self-accelerating failure. This is described as runaway linear cracking: a fast crack growth under sustained internal pressure that tends to follow a relatively straight path through the material. This term matters because it signals a dangerous, sudden mode of failure that can happen without much warning, making it critical to recognize in assessments of container integrity. Other terms don’t fit this scenario: a puncture is a hole from impact or damage rather than fatigue-driven growth under pressure, disintegration implies complete breakup rather than a rapidly propagating crack, and “closure opens up” isn’t a standard way to describe this fatigue-driven, pressure-accelerated failure.