ISO 14617-11:2002

Overview

ISO 14617-11:2002 - Graphical symbols for diagrams: Devices for heat transfer and heat engines defines a harmonized set of graphical symbols used in technical diagrams for heat-transfer equipment and heat engines. Published as part of the ISO 14617 series (first edition, 2002-09-01), this part standardizes symbols for devices such as heat‑exchangers, condensers, cooling towers, boilers, heat pumps, turbines and reciprocating/rotary engines. It supports consistent P&ID, process flow and equipment diagrams across industries.

Key topics and requirements

• Scope and purpose: Symbols specifically cover devices for heat transfer and heat engines. Fundamental rules for symbol creation and application are referenced to ISO 81714-1 and ISO 14617-1.
• Symbol categories: The standard organizes symbols by equipment type, including:
  • Heat‑exchangers and condensers (basic symbols and application examples)
  • Heat‑exchangers of specified design (straight-tube, U‑tube, coil, plate, spiral, double‑pipe, regenerative pre‑heater)
  • Cooling towers
  • Boilers, steam generators, furnaces, hot air generators (including supplementary identifiers such as fired, electric, nuclear)
  • Heat pumps, refrigerators and freezers (with quantity-level transitions)
  • Steam and gas turbines, jet motors, turbo‑fan
  • Engines with reciprocating or rotary pistons (internal, external combustion)
  • Miscellaneous items (e.g., flare)
• Application rules and registration: Symbols include application rules (when to show an envelope, when to indicate construction) and cross-references to registration numbers and examples (e.g., X2501 heat‑exchanger). Use of the symbols should follow the presentation and registration guidance in ISO 14617-1.
• Normative references: ISO 14617-1, ISO 14617-2 and ISO 81714-1 are normative documents for application, general symbols and basic design rules.

Practical applications

• Standardizes pictograms in process and plant documentation such as P&IDs, system schematics, HVAC diagrams, refrigeration and power‑plant layouts.
• Improves interoperability and clarity in engineering drawings, procurement specifications, maintenance manuals and safety documentation.
• Supports consistent training materials and cross‑discipline communication between process engineers, mechanical designers, control engineers, CAD drafters and equipment manufacturers.
• Useful in industries including power generation, petrochemical, HVAC, refrigeration, and any process plant that uses heat-transfer equipment.

Who should use this standard

• Process and mechanical engineers creating P&IDs and system diagrams
• Technical illustrators and CAD specialists producing schematics
• Standards committees, equipment manufacturers and technical authors
• Maintenance, safety and procurement teams who rely on unambiguous equipment diagrams

Related standards

• ISO 14617-1: General information and indexes for graphical symbols
• ISO 14617-2: Symbols having general application
• ISO 81714-1: Design rules for graphical symbols used in technical documentation

Using ISO 14617-11 ensures diagrams for heat-transfer devices and heat engines are clear, consistent and internationally understood - essential for design, operations and safety across global engineering projects.