Special Process Heat Tracing(QM) Flashcards
What is the main purpose for Special Process Heat Tracing system ?
Used to maintain temp in special processes which contain:
-Fluid in pipes, tanks,valves, & pumps that need heat to prevent precipitation of concentrated material in fluid
What company’s does the Heat Tracing System supply ?
-Boric Acid Batching Tank
-RMWT Piping
-Holdup Tank Piping
-RWT piping
-RU 141
-Hydrogen Analyzer
-Solid Radwaste
-Liquid Radwaste Evaporator
-Boric Acid Concentrator
Where does the Heat Tracer Control Panel receive its power from ?
Uses MCC D-Panel that has output 120VAC
What functions does the Heat Tracer Control Panel play ?
-Control & distribute heater element power
-Monitor & display temp levels of heated system
-Monitor heater continuity & power supply
-Integrate alarms each panel into common alarm in control room
What kind of instrumentation for each heat trace circuit controller for either analog or digital display ?
-Controller setpoint indications on calibrated dial in Fahrenheit
-Deviation meter displaying high or low in Fahrenheit from setpoint
-High Alarm light
-Low Alarm light
-Heat “ON” light
What instrumentation is not mounted on individual modular controller, that is included on control panel ?
-Heater element failure light
-Fan Failure light required for cooling fans
-Panel annunciator & light during Hi or LO temp, Heater Element failure, or Fan failure
How do you silence the control panel annunciator & light ?
They have to manually be reset
When will a trouble alarm be activated in control room for heat tracing local panel ?
Any alarm signal or failure of power to the local panel
Where are the heater elements physically installed at ?
Installed along side pipes under the insulation
What is embedded in the heat producing material for the Self-Limiting Heaters ?
They have 120VAC bus wires embedded, also has a separately insulated neutral return wire within overall Tefzel jacket
What is the Neutral return wife used for on the Self-Limiting Heaters?
Provides electrical flow path for monitoring continuity of heater circuit
What is the temperature a piping system is supposed to be maintained at by using Self Limiting Heater elements ?
Maintain temperature over 200F
What systems use Mineral Insulation cables for heating ?
System requiring temperatures above 200F
What does a temperature sensor do on a heat traced line ? What does the controller do ?
-Provides a signal to panel mounted controller
-Controller displays line temp & compares it to HI & LO set points, if line temp drops below it will energize heater elements
How can heater elements be manually de-energized or energized ?
De-Energized- Open branch circuit breakers
Energized- Raise setpoint level on controller
