Emergency and Crisis Management - Health Safety and Environment in Petroleum Industry - Petroleum Engineering Previous Year Questions

__________ is a mode of flame propagation in a pre-mixed gas, and drives a leading shock front into the quiescent, unburnt gas at supersonic velocity, immediately followed by a combustion zone.

Consider the following accident scenario:
Failure of a drain connection on a rich oil line at the base of an absorber tower in a gas producing plant allowed the release of rich oil and gas. The resulting vapor cloud ignited from the ignition system of an engine-driven recompressor. The absorber tower eventually collapsed across a pipe rack. The breakage of the pipelines added more fuel to the fire and lead to the total destruction of the plant. The resulting fire burnt for 3 days.
Match the three steps of any accident (initiation, propagation, and termination) to the events that occurred in the above scenario.

Steps of Accident	Events
(P) Initiation	(I) Formation of vapor cloud
(Q) Propagation	(II) Failure of drain connection
(R) Termination	(III) Consumption of all combustibles

Choose the CORRECT match of the fire detection systems in GROUP X with their corresponding working mechanisms in GROUP Y.

GROUP X	GROUP Y
(P) Fusible plug loops	(I) Detects rise in temperature caused by fire and visible/invisible particles of combustion.
(Q) Thermal and smoke detection system	(II) Functions based on drop in pressure that activates fire shutdown.
(R) Gas detection system	(III) Detects flammables.