Passage:
In commercial storage warehouses located in sub-freezing environments, facility managers install dry-pipe fire suppression systems rather than conventional wet-pipe configurations. In these installations, overhead distribution pipes throughout the unheated warehouse contain pressurized nitrogen or compressed air rather than standing water. A specialized mechanical control valve holds back the municipal water supply in a dedicated, heated riser room. When ambient heat from a fire activates an overhead sprinkler head, the escaping gas creates a rapid drop in line pressure, which triggers the control valve to open and flood the overhead network with extinguishing water.
Statement: Based on the passage, the dedicated riser room is heated to prevent the held-back municipal water supply from freezing before deployment.
Cevap: Cevap