TXP CLC Course
2.
Cooling Water System Concept
2.1
The cooling water system consists of a tank holding the cooled water that
is to be circulated through the heat exchanger. Level in the tank is kept
constant by a mechanical float valve and is displayed graphically to the
operator for monitoring purposes by transmitter 00PAC00CL101-XQ01.
This transmitter is also used as a permissive to start either pump only
when the level is above 10%.
2.1.1 Ahead of each pump is a filter with a differential pressure switch:
00PAC08CP010-XG51 and 00PAC08CP020-XG51 respectively. They are
used to disable their associated pumps when the differential pressure is
greater than 2 PSI and notify the operator via an alarm.
2.1.2 The flow is controlled by a 4-20 mA control valve 00PAC20AS151 ZQ01
which has a controller whose output is proportional to the process variable
in a range from 150 to 200 degrees Fahrenheit. The process variable is
the oil temperature exiting the heat exchanger measured by transmitter
00LAB10CT101-XQ01. If the temperature exceeds 200 degrees
Fahrenheit notify the operator via an alarm.
2.1.3 Immediately down stream of the control valve flow is measured with a DP
transmitter 00PAC21CF101-XQ01. This flow measurement is displayed
graphically to the operator for monitoring purposes.
3.
Emergency Stop Valve Logic
3.1
A Normally Open solenoid valve is located ahead of the Heat Exchanger
for use as an Emergency Stop valve: 00PAC30AA030
3.2
If the tank level drops below 25% the ESV will close
3.3
If the lube oil temperature exceeds 200 degrees Fahrenheit the ESV will
close
3.4
If both pumps are off and there is no flow through the control valve the
ESV will close
3.5
Anytime the ESV is closed the control valve will also be forced open
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