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Thank you for subscribing to Paratherm TipSheet, a short,
monthly technical email series for users of thermal fluids and systems.
Paratherm continues the series with this fifth installment, "Proper
System Shutdown". Among the topics addressed in future TipSheets
will be types of heating for process applications, thermal
fluid selection and analysis, system selection, design, installation,
maintenance and troubleshooting, and cost/benefit analysis.
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The performance and operating life of your heat transfer
fluid can be maximized if you pay close attention to system shutdown
procedures.
Otherwise the fluid can be overheated and "bruised," and the system
itself may ultimately be damaged.
During operation, the heater's refractory and structural
metal get almost as hot as the flame itself. If the entire
system is shut down at once, the heater stops firing and
the pump ceases to move the fluid. The intense heat stored
in the heater's refractory and structural metal cannot quickly
exit the stack, and remains in the firebox -- scorching the
heater tubing and cooking the thermal fluid inside.
It’s very important when shutting the system down,
to turn the heater off but keep the circulating pump running.
When the heater outlet
temperature has decreased to 250°F or lower, it’s generally safe to
shut the pump down. You should keep the heater blower running if possible.
By forcing cool air into the firebox, heat can be more quickly pushed
out the stack.
For more technical data on Proper Shutdown Procedure contact our
engineering staff at 1-800-222-3611, or visit one of the links below...
Paratherm Technical Data Sheet:
Fluid Degradation Problems with Improper Shutdown of Thermal
Oil Systems
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