Asphalt Kettle

Suggested Spraying Temperatures

Asphalt Haul Trucks

Equipment Operator Basic - Beginning construction equipment operators manual
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To compute truck application speed in feet per minute (FPM): To compute truck application speed in miles per hour: To compute the length of spread in feet: Where L = T = W = ROA = Length of spread in feet Total gallons in distributor Sprayed width of roadway in feet Rate of application in gallons per square yard. ASPHALT KETTLE The asphalt kettle shown in figure 16-37 is equipped for hand-spraying bituminous materials for dressing stretches of road or runway shoulders, filling surface cracks, and spray-coating areas for asphalt repairs, surface treatment, or seal coating. The trailer-mounted tank consists of an outer shell with a 165-gallon capacity storage and melting tank Figure 16-37.—Asphalt kettle. mounted inside. A removable fuel burner, mounted inside the kettle outer shell, provides heat to the melting tank through a baffle. A flue stack located on the forward end of the melting tank over the top of the baffle and burner assembly, provides an escape for exhaust gases. A thermometer, inserted through an insulated pipe into the interior of the melting tank indicates the temperature reading of the bituminous material being heated. When the bituminous material is overheated, a fire or explosion can result. A two-cylinder gasoline engine provides power for the bitumen pumping system. When you shift the clutch shifter lever, the engine is engaged to the pump assembly that provides the pressure for all pumping operations. A flexible, metal spray hose, which connects the pump to the hand-held spray bar assembly, is used to convey bitumen to the surface being repaired. SAFETY PRECAUTIONS Safety precautions for the distributor truck and asphalt kettle operations are as follows: . Always have dry chemical type of extinguishers available and in good condition. l Check all body mounting tie-downs and fasteners. On trailer units, check kingpin plate fasteners and all suspension and running gear components. . Lighted cigarettes or other sources of combustion must be kept clear of open manholes or overflow vents to reduce fire hazards. l Sparks from the engine exhaust can be for the ignition of volatile gases. . Remain clear of rotating drives when the unit is in operation to prevent becoming entangled in the machine. c Use goggles and gloves or insulated material when handling the spray bar, sections, or hoses to prevent burns. . Monthly, check (and if necessary clean) the 3-inch overflow tube to ensure that the tube is not clogged. l Open a manhole slowly to relieve any pressure that may exist in the tank. . Check and ensure that all pipe and hose connections are secure before operating valves to eliminate leaks (that may spray hot bitumen on other personnel). l Keep the unit clean for safety and operation. 16-32

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