903.2.17 Fixed Guideway and Passenger Rail Transit Systems
An automatic sprinkler system shall be installed in all stations of fixed guideway transit systems.
- Guideways when the closest sprinkler heads to the guideway are within 3 feet (914 mm) of the edge, over the platform, and spaced 6 feet (1829 mm) on center parallel to the guideway
- Station agent booths not exceeding 150 square feet (13.9 m2) in area, when provided with an approved smoke detector connected to the building fire alarm system
- Power substations
- Machinery rooms, electrical rooms and train control rooms protected by an approved automatic fixed fire-extinguishing system
- Open stations
- Station platform areas open to three or more sides
Underground stations and stations in open cuts with walls 5 feet (1524 mm) above he top of the running rail and with a raised platform shall be provided with an under-vehicle guideway manually activated deluge sprinkler system. In open cut stations, such system shall be provided in guideways which are situated between a raised platform edge and a retaining wall.
Deluge nozzles with caps shall be located in the approximate center of track with spacing designed to completely wet the undersides of the vehicle at the applied density.
Deluge systems shall be directly connected to a water supply capable of supplying the required flow rate for a minimum 30-minute duration.