Fragments
An important consideration in the analysis of the hazards associated with an explosion is the effect of any fragments produced. Fragmentation most commonly occur in high explosives events, fragmentation may occur in any incident involving ammunition and explosives (A&E). Depending on their origin, fragments are referred to as “primary” or “secondary” fragments.
Primary fragments result from the shattering of a container (e.g., shell casings, kettles, hoppers, and other containers used in the manufacture of explosives and rocket engine housings) in direct contact with the explosive. These fragments usually are small, initially travel at thousands of feet per second, and may be lethal at long distances from an explosion.
Secondary fragments are debris from structures and other items in close proximity to the explosion. These fragments, which are somewhat larger in size than primary fragments and initially travel at hundreds of feet per second, do not normally travel as far as primary fragments.
Read more about this topic: Explosives Safety
Famous quotes containing the word fragments:
“I was even more surprised at the power of the waves, exhibited on this shattered fragment, than I had been at the sight of the smaller fragments before. The largest timbers and iron braces were broken superfluously, and I saw that no material could withstand the power of the waves; that iron must go to pieces in such a case, and an iron vessel would be cracked up like an egg- shell on the rocks.”
—Henry David Thoreau (1817–1862)
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—Derek Walcott (b. 1930)
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—Thomas Henry Huxley (1825–95)