El Dorado Hills is a rapidly
growing community on US 50 east of Sacramento, in
the picturesque Sierra Nevada foothills. The departments
requirements for high pressure breathing air and logistics
of providing that air on quick demand lead them to
investigate the merits of a mobile breathing air unit
that could manufacture air anywhere, anytime and at
a high demand pace. With one successful Hackney Air
Truck already in long time service at SacMetro and
another identical unit on order, Hackney and American
Bristol were the logical choice.
The chassis of choice was the new International 4400
with 330 hp engine. The chassis was equipped with
an Allison MD3060 transmission, air conditioner, alloy
wheels and air suspension seats.
The body is a Hackney DF0773A, 7-compartment
with drop/pinch frame. The 74" wide wheelhouse
compartment easily accommodates the 20-hp, 26.5 cfm
Ingersoll-Rand 6000 psi compressor and six 6000 psi
ASME air storage vessels. The 73" high rear compartment
is designed specifically for the RevolveAir 2X2 fill
station with LE5000 computerized fill controls. The
rear bumper has is recessed in the center to permit
the operator to stand a close as required to the fill
station and controls. One of the best qualities of
the system is how quiet it is during fill operations.
Unlike some aluminum block compressors that are screaming
at high rpm’s, the Ingersoll-Rand is operating
during a full charge cycle at only 950 rpm’s.
A normal conversation can be conducted at the fill
station during fill operations.
The Hackney electrical system is
multiplexed and features an integral modem that permits
field diagnostics and even reprogramming via a telephone
connection to the factory.
Twenty five (25) spare SCBA’s
are also transported within the body, along with two
complete SCBA’s. A 40kw, 3-phase PTO driven generator
provides power to the air compressor motor, a NightScan
light with four 750W high-output Focus light heads
and two 750W Focus tri-pod flood lights. A 240VAC
Hannay cord reel is mounted in the upper rear compartment
with 200 ft. 10/4 cord connected to a power distribution
box with four outlets. The box is split into two separate
120V circuits, providing maximum amperage output top
all four outlets at 200 ft. The emergency light package
is an all-strobe Whelen system with Whelen Traffic
Advisor on the upper rear body.
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