TM 5-3895-368-14&PSection III. - OPERATING INSTRUCTIONSFigure 3-1. Controls and Instruments.3-1.Controls and Instruments.a. General. Before beginning operation of theasphalt melter unit, operators should become thoroughlyfamiliar with the location and function of all controls andinstruments. The following paragraphs describe eachcontrol and instrument unique to the asphalt melter.Consult operator instructions supplied with heat sourceunit and asphalt distributor pump for identification ofcontrols on those units.b. Thermometer. The asphalt material tempera-ture gauge (Figure 3-1) is a direct, gauge reading, bi-metal thermometer for monitoring the temperature of themelted asphalt material in the storage tank. For mostefficient transfer of asphalt material, temperature shouldbe maintained at approximately 235°F. for 85-100penetration asphalt cement.c. Tunnel Inlet Gate Valve. The tunnel inlet gatevalve (Figure 3-1), located at the right side of the melter,is an all iron, rising stem gate valve, with a forged steeldisc. This valve is used to regulate the flow of heattransfer oil to the heat coils of the de-drumming tunnel.During dedrumming operations, this valve is normally inthe full open position. When de-drumming has beencompleted, this valve is closed, directing all heat transferoil to the heat coils in the bottom of the storage tank.d. Storage Tank Inlet Gate Valve. The storagetank inlet gate valve (Figure 3-1), located on the lowerpiping connection to the storage tank, is identical inconstruction to the tunnel inlet gate valve. This valveregulates the flow of heat transfer oil to the heating coilsin the storage tank. During de-drumming operations, thisvalve must be used in conjunction with the tunnel inletgate valve to divide the flow of heat transfer oil between3-1
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