2.9
Flame detectors shall operate on the dual spectrum ultraviolet-infrared
(UV-IR) principle. Detector shall employ a solar-blind UV sensor with a
high signal-to-noise ratio, and a narrow band IR sensor. Detector logic
shall require UV and IR signals to be present, in the proper ratio or
signature as emitted by a hydrocarbon fire, before the detector initiates
an alarm. [Detectors shall respond within 5 seconds to a JP-4 fire 3 meters
10 feet square, 46 meters 150 feet from the detector.] Detector shall not
be activated by non-fire sources such as continuous or intermittent direct
or reflected solar radiation, arc-welding, lightning, radiant heat, x-rays,
artificial lighting, radio transmissions, and normal jet engine functions.
Detector shall have an automatic through-the-lens self-testing feature.
Malfunction of the detector circuitry, or degradation of the sensors' lens
cleanliness to the point where the detector will not detect the design fire
signature, shall cause operation of the system trouble signals. Logic
circuits necessary for operation of the detector shall be integral to the
detector or located in separate flame detector control panel(s) located
adjacent to the foam system control panel(s). Each detector in alarm shall
be individually annunciated by an LED on the detector or at the detector
control panel. Primary and auxiliary power supply shall be taken from the
foam system control panel(s). Detectors, and associated control panels if
required, shall be compatible with the foam system control panel(s).
Detectors and associated control panels shall be weatherproof, or housed in
weatherproof enclosure(s) when in an area subject to system discharge and
shall also be explosion-proof when located in hazardous areas as defined by
NFPA 70. Detector spacing and location shall be in accordance with NFPA 72,
their UL listing or FM approval, and the manufacturer's recommendations.
The detector manufacturer shall determine or approve the detector layout.
Detector layout drawings shall include horizontal and vertical angles for
correct aiming. Locate detectors so that every portion of the protected
[floor] area is within the field of view of at least [two] [three]
detectors, taking into account fixed obstructions. Provide detectors with
manufacturer's swivel mounting bracket. Provide a permanent engraved rigid
plastic or metal label at each detector location with detector aiming
information (degrees horizontal and vertical) for the corresponding
detector.
2.10
ELECTRICAL WORK
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NOTE: Edit Section 16402, "Interior Distribution
System" and include as part of the project
specification.
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NOTE: When project includes requirement for a
building fire alarm system, include Section 13852 in
the project specification. When project requires
only tying into an existing building fire alarm
system, fire alarm wiring should be specified in
this section. Select the first 13852 Section title
when using the basic NAVFAC guide specification
covering the subject work or select the second title
when using the EFD regional guide specification
covering the subject work.
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SECTION 13956N
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