]2.16.3
AFFF Concentrate Storage Tanks
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NOTE: Designer must calculate foam tank capacity
based on maximum flow for maximum duration to
determine size of tank and space required. Do not
label foam tank capacity on drawing. Exact tank
size (which may be larger) will be determined by
Contractor's hydraulic calculations.
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Tank shall be designed for storage of AFFF concentrate at atmospheric
pressure, and shall be [horizontal] [or] [vertical] cylindrical, fiberglass
or polyethylene construction. Tank shall have the following: Drain valve
located at the lowest point in the tank, connections for concentrate supply
and return lines to the proportioners, top-mounted fill connections and
inspection hatch, and a pressure/vacuum relief vent. All openings and tank
connections shall be installed at the factory, no holes shall be made in
the tank shell in the field. Tank shall include all necessary supports for
free-standing installation. Provide a gage or unbreakable sight glass to
permit visual determination of level of tank contents, unless liquid level
is clearly visible through shell of tank. Size tank to provide sufficient
AFFF concentrate for the time specified when the system is discharging foam
solution at total maximum system flow. Also provide connected reserve
tank(s) of equal capacity. Permanently label each tank with its capacity,
type and percentage of concentrate, which system it serves, and whether it
is a main or reserve tank.
2.17
OSCILLATING MONITOR NOZZLES
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NOTE: Refer to MIL-HDBK-1008 and the appropriate
NFPA standard(s) governing the particular facility
to determine the density required. Consult the
activity for the floor area under the wings and
fuselage.
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Fixed, water motor operated, [with] [without] override to allow manual
aiming. Oscillation arc shall be adjustable from at least 0 to 2.88 radian
165 degrees. Oscillation speed shall be adjustable from 0 - 0.52 radian 30
degrees per second. Nozzle shall be adjustable while in operation from
0.52 radian 30 degrees below to1.40 radian 80 degrees above horizontal,
with lock or latching mechanism. Nozzle shall be [non aspirating] [air
aspirating] type, adjustable while in operation from straight stream to
fan-spray. Nozzle shall be capable of retaining the adjusted setting once
the desired pattern has been set. [Nozzle shall produce a straight stream
of 46 meters 150 feet at [1920 L/m] [500 gpm] [_____] and [690 kPa (gage)]
[100 psig] [_____].] [Nozzles shall provide a minimum application rate of
[4.2] [_____] L/m per sq meter [0.10] [_____] gpm per square foot over [the
entire floor area] [[_____] square meter feet of floor area underneath the
aircraft wings and fuselage]]. Provide normally open 0S&Y gate valve in
supply line at each monitor location.
2.18
HAND HOSE LINES
Provide each hose station with flow-through reel and [_____] meter of 40 mm
feet of 1 1/2 inch hard rubber hose and nozzles. Nozzle shall have
pistol-grip ball shutoff valve. Nozzle shall be [non aspirating] [air
SECTION 13956N
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