Tunnel fire protection system

摘要

A deluge fire protection system for tunnels having vehicle traffic including a main water supply pipe and a horizontal spray nozzle arrangement. The horizontal spray nozzle arrangement includes a nozzle device having an inlet portion defining an internal diameter and an external nominal diameter. The horizontal spray arrangement includes a coupling arrangement between the main water supply and the nozzle device. The coupling arrangement defines a multi-direction flow path between the main water supply and the nozzle device. The multi-direction flow path has an effective length of at least eight times a diameter of the inlet portion, and a cross-sectional area along the effective length greater than the cross-sectional area defined by a diameter of the inlet portion of the body of the nozzle device. The coupling arrangement provides for water delivery to the nozzle device at a working pressure ranging from about 10 psi. to about 30 psi.

主权项

1. A deluge fire protection system for an area having a surface for vehicular transit, comprising:
a main water supply pipe disposed a first distance from the surface; and a horizontal spray nozzle arrangement disposed a second distance from the surface, the second distance being less than the first distance; the horizontal spray nozzle arrangement including:
a nozzle device having a deflector and a frame supporting the deflector, the frame having a body defining an inlet portion, an orifice and a nozzle axis extending from the inlet portion to the orifice along an internal passageway, the inlet portion defining an internal diameter and a cross-sectional area defined by the internal diameter of the inlet portion, the passageway and the orifice defining a nominal K-factor of at least 8.0 GPM/(PSI)1/2; anda coupling arrangement between the main water supply and the nozzle device, the coupling arrangement defining at least a two-direction flow path between the main water supply and the nozzle device; the two-direction flow path having an effective length of at least eight times the internal diameter and a cross-sectional area along the coupling arrangement that is greater than the cross-sectional area defined by the internal diameter of the inlet portion;wherein water discharged from the horizontal spray nozzle arrangement is controlled by a deluge valve coupled to the main water supply pipe, the water being delivered to the spray nozzle arrangement at a working pressure ranging from about 10 psi. to about 30 psi.