Nozzle shall be of fixed constant flow type, cast brass construction [25]
[40] [_____] mm [1] [1-1/2] [_____] inch male NPT, suitable for use with
AFFF solution. Nozzle shall be factory set for required discharge
characteristic. Discharge characteristic or k-factor(s) shall be as
indicated on the drawings. Nozzle discharge pattern shall be field
adjustable and lockable. Nozzle flow and effective reach of discharge at
various nozzle patterns shall have been determined by the manufacturer's
actual discharge tests with nozzles in horizontal pattern at nozzle
pressures of 345 kPa 50 psi, 517 kPa 75 psi and 689 kPa 100 psi. Nozzle
settings shall be factory set. Field disassembly, adjustment or assembly
which could alter discharge characteristic will not be permitted.
2.14.3
Oscillating Monitor Nozzle Assembly
Assembly shall include water-powered oscillator, monitor, nozzle, and
related ancillary components which shall be the product of one
manufacturer. Water-powered oscillating mechanism shall be equipped with a
strainer. Assembly shall include a test connection for operating the
oscillator from an auxiliary water source without requiring discharge
through the nozzle. Angle of elevation shall be adjustable from 20 degrees
below to 60 degrees above horizontal. Oscillation arc shall be adjustable
from 10 degrees to 165 degrees and speed shall be adjustable from 0 degrees
to 30 degrees per second. Components in contact with the AFFF solution
shall be compatible with the foam concentrate and metallic components shall
be brass, bronze or stainless steel. Nozzle shall be a standard model of
the manufacturer and shall have a fixed discharge characteristic. Nozzle
discharge characteristic shall have been determined by discharge tests.
Monitor nozzle assembly shall be approved by Factory Mutual and listed in
FM P7825a.
2.15
AFFF LIQUID CONCENTRATE
AFFF concentrate shall be 3 percent conforming to MIL-F-24385. Concentrate
shall be the product of one manufacturer. Mixing of non-identical brands
of concentrate will not be permitted.
2.16
DIAPHRAGM TANK BALANCED PRESSURE PROPORTIONING SYSTEM
**************************************************************************
NOTE: Delete paragraph PUMPED BALANCED PRESSURE
PROPORTIONING SYSTEM if this paragraph is used.
Specify tank to be horizontal type unless project
requirements specifically require vertical.
**************************************************************************
Tank shall be a steel pressure vessel constructed in accordance with ASME
BPVC SEC VIII D1. ASME label shall be permanently affixed to the tank.
Tank shall be horizontally mounted on steel saddles and shall contain a
full internal diaphragm (bladder) having a minimum capacity of [_____] L
gallons. Diaphragm shall be nylon-reinforced Buna-N rubber or other
approved material conforming to the inside shape of the tank. AFFF
concentrate shall be stored inside the diaphragm and the concentrate shall
not be in contact with the steel tank. The tank shall have perforated PVC
tubes installed inside the diaphragm to assure full displacement of the
stored concentrate. Tank shall be equipped with the manufacturer's
standard fittings and trim, including AFFF fill and drain connections,
water fill and drain connections, and concentrate sight gauge.
SECTION 13955A
Page 18
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