This specification is for providing one (1) new model, trailer mounted,
electric heated, asphalt Patch Box such as "Patch King" model PK30T or
approved equal, which is intended to be used for the controlled heating
of both hot and cold mix asphalt.
14 feet PATCH BOX LENGTH: 7' 0"
8 feet PATCH BOX WIDTH: 6 feet
Doors Closed approx. 6 feet 8 inches; Doors Open 9 feet 5 inches.
TOP LOADING DOORS:
shall have two (2) manually operated, hinged and
insulated top loading doors approximately 3 feet x 7 feet each.
Three (3.0) cubic yards asphalt maximum. 4.5 tons
Hot asphalt box shall have weight not to exceed 4700 pounds when empty.
Standard factory color is black. Other colors available on request.
The Patch-Box shall be capable of keeping 3.0 yards of hot
mix at working temperature for a ten (10) hour period by use of the
built in electric heating system. It shall also have the ability to
preheat the box by either manually turning the heat on or by means of a
time clock to raise the temperature prior to loading the box with
hot-mix. (Time clock is an option)
Shall be electric of the Lo-Density type, which does not
exceed one (1) watt per square inch of heated surface on the box's
bottom, sides and end.
Shall be 10kW, 240V 1 or 3 phase or 480V 3 phase.
There shall be a sufficient number of heating elements running the
length and width of the box, evenly separated to heat all surfaces
Heaters shall be open coil design featuring patented "Coil Lock" high
temperature insulators supporting 80/20 grade nickel/chromium
resistance wire of 20 gauge or heavier. Heaters shall be sheathed in 2
1/4" minimum OD. Tubing with a 14-gauge minimum wall thickness. The
heaters shall be capable of maintaining a uniform temperature in a
range from 50 degrees to 350 degrees Fahrenheit. HEATING ELEMENT SHALL
BE REMOVABLE WITHOUT REMOVING THE INSULATION.
The control panel shall be UL-LISTED and built in a
facility subscribing to UL's listing and recognition services for
industrial control equipment, UL 508. The panel will carry the UL label
for "Enclosed Industrial Equipment". Panel Construction shall be NEMA
type IV, rain and dust-tite. It will be U.L. Listed and approved with
industrial type thermostat, contactors and fusing.
Shall have a Hi-Low heat selector switch to provide
heat for full or partial loads. This switch shall be mounted in the
control panel. It shall be capable of providing energy individually to
the sides or to the sides and ends.
PLUG CONNECTORS AND CABLES:
Electric plug connectors and cable shall be
power-tite, pin and sleeve type receptacle and plug with ground. Plug
shall be rain- tite, and weather-tite with 25 ft. cable 90 degree
centigrade type S.O. heavy duty of appropriate volt braided wire, with
all to be U.L. approved.
Box shall be constructed of steel plate electrically welded and reinforced at all juncture points.
The sloping side-walls and bottom shall be constructed of 1/4" minimum thickness steel plate or approved equal.
The upper side and end walls shall be constructed of 10-gauge minimum thickness steel plate.
The two (2) top doors shall be full-length hollow core type
approximately 84" long x 36" wide tapering from 3" to 2" on the outer
edge. The top doors shall be constructed of sheet steel with insulation
completely filling the core. The top doors shall be independently
operated and controlled by individual manual control arms.
All insulation shall be (3) pound density
fiberglass, which provides the minimum R rating required, or an
approved equal insulation.
Three (3) inches tapering to two (2) inches at the outer
edge. Three (3) pound density that provides R4.5 per inch of thickness,
Three (3) inch thick - three (3) pound density fiberglass that provides R4.5 per inch of thickness, R13.5 total.
Three (3) inch thick - three pound density fiberglass that provides R4.5 per inch of thickness, R13.5 total.
Three (3) inch thick – three pound density fiberglass that provides R4.5 per inch of thickness, R13.5 total.
trailer shall be dual axle type with 16" wheels, heavy duty
tires, four (4) wheel electric brakes, marker lights and safety brake
lock. Suspension shall be torsion type. Pintle type hitch shall be
The entire unit shall have one (1) year warranty (minimum)
parts and labor with the exception of the trailer tires, which are
covered by the manufacturer's warranty. This warranty shall be
furnished with and as a part of the bid document and the warranty on
the entire unit shall begin when the patch box is put into operation.
The heating elements will have a five-year warranty.
TACK KING Model TK120H
2" - 3# density fiberglass equivalent to R9.
Electrical "Lo-Density" heating based on 240V single-phase
power rated at 2KW & 8.33 AMPS and 3 watts per square inch of
heater sheath so asphalt emulsion will not carbonize
Shall be connected to the patching unit unless otherwise specified.
Shall be hydraulically driven with a 3 H.P. motor pumping 3 GPM under 50 PSI.
Hydraulically driven @ 400-600 RPM with 750 RPM max.
The hydraulics shall be plumbed integral with the truck hydraulic system.