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|  MIL-T-28571G(NAVY)
on the fire pump operator's control panel. Two 2-1/2-inch discharge connections
shall be located on the fire pump operator's control panel, and two 2-1/2-inch
discharge connections shall be located directly opposite on the curbside of the
fire truck along with one 5 inch discharge connection. The 5 inch connection
shall be piped with a gated 4 inch pipe and controlled by a chrome plated
handwheel at the pump operator's control panel. One 2-1/2-inch discharge
connection shall be located at the left rear (driver's side) of the truck, below
the hose bed. Three l-l\2-inch swivel type discharge connections shall be
located in the transverse hose beds (see 3.11.2) and one l-l/2-inch swivel
discharge connection shall be located on the front bumper. One discharge
connection shall be provided to the monitor (deluge gun) turret with appropriate
piping to flow 1,250 gpm. Each discharge valve shall be the pump manufacturer's
recommended valves. The valves shall be capable of holding 500 psi in either
direction. The valve balls shall be the trunnion mounted, corrosion-resistant,
nonsticking type. The valve seats shall not require adjustment and shall be
capable of holding a vacuum or pressure in either direction. The valve ball and
seats shall be replaceable without disturbing the valve piping. Each discharge
connection shall be provided with a drain valve of at least 3/4 inch id for
draining hose lines with the pump discharge gates closed. The push-pull type
valves shall be of the water service type and shall be equipped with positive
stops . Drain valve controls shall be located at the bottom of the control panel
directly above the running board. Drain lines shall be concealed behind the
pump compartment panels and shall discharge to the ground at a point below the
bottom of the chassis frame. Each discharge connection, flow meter and drain(s)
shall be identified by a related numbering system as well as function. Five,
30 or 45 downward turn male end discharge gates, shall be provided in lieu of
straight connection discharge gates, on the 2-1/2-inch discharge connections.
Two l-1/2-inch or larger outlets supplied by at least 2-inch piping and valving
for preconnected hose lines-shall be provided at the location of the hose
storage area.
3.10.4 Reli e f valve. An automatic relief valve shall be provided for
controlling the pressure from all outlets. The locating of the relief valve
control shall be such that adjustment can readily be made by the operator when
standing in normal position, without the use of tools, and in full view of the
discharge pressure gage. The relief valve shall be of such design that when set
10 psi higher than the pump working pressure, there will not be an increase in
pump Pressure greater than 30 psi when discharge lines are shut slowly. The
relief valve shall perform satisfactorily when pumping rated capacity at any
pump working pressure over 75 psi. A relief valve drain shall be provided and
shall be in a readily accessible location. The relief valve drain line shall
discharge to the ground at a point not above the bottom of the chassis frame.
3.11 Body The fire truck shall be equipped with a body which shall
incorporate a fire pump compartment, fire pump operator's control panel,
removable water tank, three transverse hose beds, main hose bed, equipment
compartments, rear platform, foam equipment, and firefighting equipment. The
body and compartment construction structural members shall be aluminum alloy
having not less than 42,000 psi ultimate strength and 35,000 psi yield strength
with thickness of not less than 0.125 inch. The body side panels and beavertail
shall be integral. The body shall be reinforced at all stress concentration
points where equipment and compartments are attached. Wheel well liners, with
fenderettes and mud flaps, shall be furnished (front and rear) to protect
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