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.

Type P&IDNorme ANSI/ISA-5.1-2009 + ISO 10628-1:2014Moteur schematex-pidMis à jour 24/09/2026

La demande

“A product heat exchanger with a temperature transmitter on the heated outlet, a temperature controller, and a fail-closed steam control valve on the shell-side steam inlet.”

Essayez ensuiteAdd a condensate trap after the exchangerChange the steam valve to fail open

Ce que contient ce dessin

Comprenez les décisions qui le sous-tendent.

01Controlled variable

Measure the heated product outlet temperature.

02Manipulated variable

Throttle shell-side steam with V-101.

03Safe position

Close the steam valve on loss of air.

04Signal path

Use electric transmitter-to-controller and pneumatic controller-to-valve signals.

Use this pattern when product temperature is controlled by steam flow through a shell-and-tube exchanger.

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FAQ

Questions fréquentes

What does TT-101 measure?

It measures the temperature of the heated product leaving the exchanger.

Why is the steam valve fail closed?

Closing it on actuator failure stops heat input to the product.

What does TIC-101 control?

It changes the steam control valve position to maintain outlet temperature.