the tunnel and the storage tank. When de-drumming this
valve must be partially closed to divert most of the heat
transfer oil flow to the tunnel coils, but must not be
completely closed. Melted asphalt cement that is
allowed to drop onto cool or cold coils in the storage tank
will quickly solidify, resulting in the loss of time and
additional consumption of energy to remelt the asphalt.
After de-drumming operations are completed, this valve
may be fully opened.
e. Outlet Gate Valve. The outlet gate valve
(Figure 3-1), located on the upper piping connection to
the storage tank, is identical in construction to the tunnel
inlet gate valve. This valve is used to throttle the flow of
heat transfer oil through the melter, providing control of
the temperature. Opening this valve fully will tend to
raise the temperature; while partial closing of this valve
will restrict the flow and tend to lower the temperature.
f. Asphalt Jacketed Valve. The asphalt jacketed
valve (Figure 3-1) is a plug type, rotary valve, with cored
jacket for the flow of heat transfer oil to heat the valve
assembly. The valve stem and collar provide positive
stops in the full open and full closed position. For valve
installation shown, the valve is fully open when lever is
straight up and fully closed when lever is horizontal,
pointing away from the storage tank.
HOLDING BEFORE RELEASING THE
PERSONNEL MAY RESULT IF DOOR
SHOULD DROP UNEXPECTEDLY.
g. Hand Winch. The two hand winches (front
winch, Figure 3-1) are used to open and close the tunnel
doors for loading and unloading barrels. Crank the
handle clockwise to raise (open) the door. The door will
be held open when winch handle is released. To lower
(close) the door, turn the winch handle in a counter-
clockwise direction, until door is completely closed. The
winch for the rear discharge door is located on the rear
of the storage tank near the right side of the melter.
h. Hoist Control Station. The hoist control station
(Figure 3-1) is a two-position, momentary contact, rocker
switch with center "off/braked" position. Depressing the
rocker switch on the upper side will raise the load, while
depressing the lower side will lower the load. When
changing direction of travel for the load, release the
depressing rocker for opposite direction.
OPERATOR MUST WEAR PERSONAL
FULL FACE SHIELD, LEATHER OR
RUBBER SAFETY SHOES, HEAVY
PROTECTIVE CLOTHING SUCH AS
Do not operate the asphalt melter in
the rain. Operation of melter during
rain may cause the asphalt to boil
and catch fire. After a rain or during
humid conditions, open the tunnel
operating. Keep the heat transfer
a. Inspect installation of melter unit and all piping
for proper connections.
b. Refer to operating instructions of heat source
plant, and start heater. Adjust heater as required to
insure delivery of heat requirements of melter.
c. Close the asphalt jacketed valve.
d. Open all three gate valves on heat transfer oil
piping. Tunnel inlet and outlet gate valves should be
opened fully, with the storage tank inlet valve opened
only half way.
e. Open the tunnel front door and using the
electric hoist, load six asphalt drums, open end on low
side, on load ramp of the tunnel. Push each drum as
loaded to rear of tunnel with the barrel ram.
Loading of drums must be done
quickly. Asphalt may start to come
out of the open drums and adhere to
heat coils, preventing their being
moved farther into the tunnel. If this
happens, close the door and allow
asphalt to melt completely before
proceeding to load melter.
f. When all drums are loaded, close the front door
of tunnel and allow the asphalt to melt and drain into the