NEBOSH Practice Test

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Which type of explosions are associated with LNG?

Vapour cloud explosions
Electrical explosions
Non-flammable explosions
Biological explosions

The correct answer is: Vapour cloud explosions

LNG, or liquefied natural gas, primarily presents risks associated with vapour cloud explosions. When LNG is released, it can evaporate quickly and mix with air, forming a flammable vapour cloud. If this cloud encounters an ignition source, it may lead to a sudden and intense explosion, characterized by a rapid increase in pressure and the release of energy. Vapour cloud explosions are particularly dangerous because they can occur in a variety of settings, including near storage tanks and during transportation. The nature of LNG being stored in a cryogenic liquid state means that even small leaks can create large volumes of flammable gas. Recognizing this risk is crucial for safety management and emergency response in areas where LNG is processed or transported. The other types of explosions mentioned do not accurately represent the risks linked to LNG. Electrical explosions typically arise from electrical faults or equipment failures, while non-flammable and biological explosions do not pertain to LNG at all. Understanding the specific risks associated with LNG is important for ensuring appropriate safety measures and regulations are in place.