TS 4662

TS 4662 is a standard for the graphic symbols used in drawings of ships’ heating, ventilating and air conditioning installations. In practical engineering terms, it provides a common visual language for representing ship HVAC systems on plans, helping ducts, joints, appliances, fittings and ventilation components be shown consistently across technical drawings.

Why symbol conventions matter in ship HVAC drawings

Shipboard heating, ventilation and air conditioning systems combine multiple functional elements, including air distribution paths, terminals, equipment and auxiliary fittings. In drawings, graphic symbols compress that complexity into a readable format, so designers, shipbuilders and maintenance teams can interpret the same layout in the same way. This is especially useful where space is constrained and system integration is dense, as is often the case on ships.

The symbol groups identified in the standard

• General conventional signs, including symbols for principal parts and appliances
• Ducts and duct joints
• Appliances and fittings
• Ventilators
• Various conventional signs

The standard classifies the symbols given in tables under these headings, creating an organised reference for ship HVAC drafting. It is based on ISO/R 644:1967 (equivalent status noted in the bibliographic data) and the TSE edition is withdrawn, so it serves as a historical technical reference for the symbol system used in this domain.