A clear heat exchanger symbol helps readers understand the intended equipment type before they study line numbers, tags, or process details. This CAD resource is organized for P&ID and process schematic work, with symbols covering common shell-and-tube arrangements, plate and spiral exchangers, air coolers, heaters, and related equipment.
Use the legend as a drafting reference rather than as a substitute for the project equipment list or design documentation. The selected symbol should agree with the confirmed equipment type, process service, and drawing conventions used on the rest of the project.
When you’re drafting a P&ID or process schematic, using the correct heat exchanger symbol makes your drawings easier to review, easier to maintain, and consistent across the whole project. This Heat Exchanger Symbols Legend CAD gives you a practical set of commonly used exchanger symbols—so you can drop them into your diagram and move on.
What’s included in this heat exchanger symbol set
You can represent most typical exchanger selections found in industrial and building utility systems, such as:
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Shell & Tube Heat Exchanger (vertical or horizontal)
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Shell & Fixed Tube Sheet
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Shell & U-Tube Exchanger
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Floating Head (including cover plate variants)
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Kettle Reboiler / “Kettle” type exchangers
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Plate Heat Exchanger (PHE) and Plate Frame Type
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Spiral Heat Exchanger
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Compact Exchanger
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Double Pipe Heat Exchanger
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Fin Exchanger / Plate Fin Exchanger
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Forced Air Cooler and Induced Air Cooler
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Electric Heater and Waste Heat Recovery Unit
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Generic heat exchanger symbol (when the exact type isn’t specified)
How to use it in your drawings
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Use the generic symbol early in concept design, then swap to the exact type once equipment selection is confirmed.
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Keep one exchanger style across all sheets to avoid confusion during construction and commissioning.
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Pair the symbol with clear tags (e.g., E-101, service name, duty, inlet/outlet IDs) to make the P&ID readable at a glance.
How to read the heat exchanger symbol legend
The symbols communicate the exchanger family and its general arrangement. They do not, by themselves, define thermal duty, materials, pressure class, connection details, or mechanical design. Those items belong in the equipment data sheet, process documents, piping specifications, and approved project records.
Quick reference by exchanger family
- Shell-and-tube group: Use the applicable arrangement for fixed tube sheet, U-tube, floating head, kettle, or a general shell-and-tube exchanger. Orientation may also be shown where the drawing requires it.
- Plate and spiral group: Use plate heat exchanger symbols for plate-frame equipment and the spiral symbol when that exchanger type has been selected.
- Compact and double-pipe group: These symbols identify compact exchanger and double-pipe arrangements without implying unlisted construction details.
- Air-side and recovery group: Forced-air cooler, induced-air cooler, fin exchanger, plate-fin exchanger, electric heater, and waste heat recovery symbols help distinguish related process or utility equipment.
- Generic symbol: Use the generic exchanger symbol when the equipment selection is not yet finalized, then update the drawing after the equipment type is confirmed.
Drafting checks before issue
- Match the symbol to the equipment description and tag in the equipment list.
- Keep the symbol orientation and graphic style consistent across P&ID sheets.
- Confirm that inlet and outlet line connections, service names, and flow information remain legible at the final drawing scale.
- Review connected piping against the project pipe dimensions and schedules reference and relevant flange information rather than inferring those details from the exchanger symbol.
- Use the site’s piping terminology and CAD/DWG drafting references when coordinating symbols with other disciplines.
CAD and P&ID coordination
Before issuing a drawing, compare the exchanger symbol with the process narrative, equipment tag, line list, and control requirements. A symbol change may affect how reviewers interpret bypasses, isolation points, vents, drains, temperature indicators, or control loops around the equipment. Keep the downloaded DWG as a reusable drafting asset, but follow the project title block, layer, block, and naming conventions when placing it in a live drawing.
Heat exchanger symbol CAD FAQ
What does a heat exchanger symbol show on a P&ID?
It identifies the general exchanger type and provides a recognizable graphical location for the equipment. Process connections, tags, instruments, and line information provide the additional context needed to interpret the unit.
Should I use a generic or specific exchanger symbol?
Use the generic symbol during early concept work when the equipment selection is still open. Replace it with the appropriate shell-and-tube, plate, spiral, air cooler, heater, or other specific symbol after selection is confirmed.
Does the symbol define exchanger design details?
No. The symbol does not establish thermal performance, materials, pressure requirements, connection ratings, or mechanical construction. Verify those details in the approved project documentation.
Can the DWG symbols be used on every P&ID?
They can serve as a drafting starting point, but each project may use different block, layer, orientation, tagging, and annotation conventions. Check the project CAD standard before issuing a drawing.
What should accompany the exchanger symbol?
Use the equipment tag, service description, inlet and outlet line identifiers, and applicable instruments or control references. Coordination with the equipment list and piping documentation helps prevent ambiguity during review and commissioning.