Heat Exchanger Temperature Control Loop
This P&ID shows a basic temperature control loop around a shell-and-tube heat exchanger. Product enters the tube side and leaves as heated product. Steam enters the shell side through a diaphragm-operated control valve. TT-101 measures the outlet temperature and sends an electric signal to TIC-101. The controller adjusts V-101 with a pneumatic signal, changing steam flow to hold the outlet at its setpoint. The valve is fail closed so the steam supply shuts if its actuator loses air. This is a concise loop drawing for process design discussions, operator training, and commissioning checks. Add isolation, traps, bypasses, alarms, and detailed line specifications when the project requires them.
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Scenario
A process engineer needs a simple outlet-temperature loop for a product heater.
Key decisions
- Controlled variable: Measure the heated product outlet temperature.
- Manipulated variable: Throttle shell-side steam with V-101.
- Safe position: Close the steam valve on loss of air.
- Signal path: Use electric transmitter-to-controller and pneumatic controller-to-valve signals.
When to reuse this
Use this pattern when product temperature is controlled by steam flow through a shell-and-tube exchanger.
Frequently asked questions
What does TT-101 measure?
Why is the steam valve fail closed?
What does TIC-101 control?
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