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Konus Burners, Primary, and Vat Pumps

HE Heat Exchanger

Oil from the operating vat pump is continuously re-circulated through
this heat exchanger, which is used to heat the water in the log ponds.
A temperature sensor in the pond will cause the machine controller to
position the No. 3WV valve for allowing more or less heated oil to flow
from the primary pump to the inlet of the vat pump.

IV Inlet Valve

During normal operation, the valves are open, which will permit oil
flow from the Konus burners through the EV1 and/or EV2 valves to
the suction ports of the vat pumps in emergency operation. These
valves should be closed when changing the vat pumps. Please refer
to the “Isolation and Change Out Procedure” for the sequence of
opening and closing these valves.

LT Level Tank

Oil is maintained in this tank between the FS2 and FS3 float switches
at all times. When the oil level drops below the FS2 position, the level
pump located near the drain tank will start. The oil level will rise as the
pump delivers oil into the tank. Once the level rises and the FS3
switch actuates, the level pump is turned off. This tank can also be
refilled with the fill/drain pump. Specific manual valves will have to be
opened and closed to utilize this pump for filling.

If the level drops below the bottom switch (FS1) position, the system
will automatically go into the emergency mode of operation. This can
occur by a problem with the level pump or drive motor, low oil level in
the drain tank, specific valves in the improper position, or a leak in the
lines. Once the problem is corrected, the following procedure can be
used to refill the level tank; hold the FS1 and FS2 in the normal
operating position, which will start the level pump. Once the oil level
rises above the FS2 position, the switches can be released.

Troubleshooting Thermal Oil Systems Page 9