61
The most dangerous situation is to begin circulation of a “wet”
spray bar into a full tank of hot asphalt. Spray bar circulation forces the
material in the spray bar into the bottom of the tank. If the material is
water-based (emulsified asphalt), the hot asphalt in the tank changes the
water to instant steam. A gallon of water makes 60 gallons of steam. The
steam has tremendous force displacing the asphalt in the tank out the
dome lid (if it is not open, the steam pressure will open it) creating the
worst mess you have ever seen as well as severely burning everyone in
the area. There are several methods to prevent this, the first and simplest
way is to flush the entire system with a Cut-Back asphalt. This method is
the safest but does not flush 100% of the water out. This is a good first
step to flushing the tank prior to loading hot asphalt.
Shooting emulsion
over a long period of time can form “pockets” or areas where wet
emulsion is trapped under broken or dried emulsion. Cut-Back may not be
hot enough to soften and dissolve these pockets.
Whenever you use the Asphalt Pump, visualize the flow of material
through the pump as follows:
Pump in forward – Material flows in at the bottom out at the top.
Pump in reverse – Material flows in at the top out at the bottom.
a.
Flush with Cut-back Asphalt.
Bunker fuel is OK in-place of cutback.
b.
Off-load all of the emulsified asphalt, draining the tank as dry as
possible.
c.
Drain Flush Tank or On the Side Control Panel, select and perform
“Empty Flush Tank”.
d.
Re-Fill Flush tank with diesel or a non-water based solvent.
Summary of Contents for BC-502/CRC
Page 1: ...INSTRUCTION MANUAL Model BC 502 CRC Asphalt Distributor ...
Page 42: ...BC 502 CRC 42 ...
Page 43: ...43 ...
Page 69: ...69 ...
Page 87: ...87 Stage 1 ...
Page 151: ...151 Figure 13 INNER WING ASSEMBLY Figure 14 HYDRAULIC SYSTEM ...
Page 152: ...152 Figure 15 REAR PANEL ASSEMBLY ...
Page 154: ...154 Figure 17 PUMBING AND VALVE ASSEMBLY ...
Page 156: ...156 Figure 19 PUMP DRIVE ASSEMBLY ...
Page 157: ...157 Figure 20 PRODUCT PUMP ...
Page 158: ...158 Figure 21 SIDE CONTROL BOX SCHEMATIC ...
Page 159: ...159 Figure 22 CAB CONSOLE SCHEMATIC ...
Page 160: ...160 Figure 23 VALVE BOX SCHEMATIC ...
Page 161: ...161 Figure 24 REAR CONTROL BOX SCHEMATIC ...
Page 162: ...162 Figure 25 REAR CONTROL BOX PROPANE SCHEMATIC ...
Page 163: ...163 Figure 26 HYDRAULIC LAYOUT ...
Page 164: ...164 Figure 27 HYDRAULIC SCHEMATIC ...