All machines, tools and equipment used in the performance of work required by these specifications will be subject to the approval of the Inspector and maintained in a satisfactory working condition at all times.
Here specially for the heat /hot lance. The heat lance shall be capable of producing air temperature up to 2500°F and constructed of suitable hardware. Same shall be provided with separate valves to control propane, burner air, and lance air. The fuel and the burner air shall be mixed only at the point of combustion before leaving the burner tube. A separate air lance tube shall pass inside the burner chamber and be orificed to a maximum ¼” (6 mm).
At the fuel source, the propane shall be controlled by a high-pressure regulator to control fuel pressure from 5 PSI to 30 PSI and to prevent flashback. Burner BTU should range from 20,000 to 500,000 BTU. A wheel kit constructed to keep the unit at the proper height and angle from the pavement and to prevent debris from striking the operator should be used. Caution should be taken when using the heat lance to not overheat and oxidize the pavement. A slight darkening (bleeding) of the pavement is acceptable.
