UFC 3-600-01
17 April 2003
with change 16 January 2004
the speed or reliability of operation will give a distinct alarm separate from the
water flow alarm.
6-9.1.2
Water Demands for Ultra High-Speed Deluge Systems. Water
supplies for ultra high-speed deluge systems must be adequate to supply the
total demand of the largest fire area at the specific residual pressure required by
the system for a period of at least 15 minutes unless a hazard analysis indicates
a longer flow time is needed. Provide a flow rate of at least 20.4 L/m/m (0.50
gpm/ft2) over the entire area protected by the ultra high-speed deluge system
unless a hazard analysis indicates a higher flow rate is needed.
6-9.2
Ultra High-Speed Deluge Systems. Comply with the
requirements of NFPA 15, except as noted in this standard.
6-9.2.1
Response Time
Response time must be the time for system operation from the
presentation of an energy source to the detector to flow of water
from the water spray nozzle being tested.
Ultra high-speed deluge systems must be designed to have a
response time of not more than 100 milliseconds, unless a risk
assessment or other data indicates a need for a faster response
time.
6-9.2.2
Timers.
Timers or similar devices to stop water flow after a predetermined
time must be permitted.
Timers or similar devices that shut off the water flow after a
predetermined time (typically 1 to 2 minutes) when the optical fire
detectors no longer detect a fire are permitted. In case of a failure,
it must fail in the on (water flowing) position.
6-9.2.3
Design. Due to the speed of water coming from all the nozzles,
ultra high-speed deluge systems depend on the detection system, piping
network, nozzles and water supply characteristics. Only experienced designers,
engineers, and installers who understand the system's limitations and capabilities
should provide the design, specification, and installation of the deluge system.
6-9.2.4
Risk Assessment. All munitions production, maintenance,
renovation, quality assurance and demilitarization operations will receive a risk
assessment to identify potential fire and thermal threats and to assess the level
of risk. The hazard must be accurately defined. A potential fire and or thermal
hazard whose level of risk is high or extremely high is unacceptable. The risk
assessment will consider factors such as:
46
Previous Page
