【Daily Question】Utilities - Water Supply and Drainage - 20191225
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In a pre-action system, the water supply pipes are normally ( ). In the event of a fire, a more sensitive fire detection system activates the deluge valve and the water supply pump, thereby completing the process of filling the pipes in ( ), converting the system to a wet-system configuration that allows the sprinklers to start spraying water immediately once they open. A. Without water, before the closed sprinkler opens B. With water, after the closed sprinkler opens C. Without water, after the closed sprinkler opens D. With water, before the closed sprinkler opens Answer: A
A. Without water, before the closed-type sprinkler is activated