Drawings / Mechanical legend

Mechanical symbol legend

Common equipment shapes used on the Gulf Coast Example Plant teaching sheets. Shapes are simplified for training, not for construction.

Equipment

Centrifugal pump P-1001 Vertical drum V-1101 Shell and tube exchanger E-1001 Storage tank T-1001 Compressor Filter / strainer

Valves and blinds

Gate / block Control valve Check valve Spectacle / blind Open symbol is two triangles point to point. Actuator box on top marks a control valve.

Relief devices

Spring PSV / PRV PSV-1201 Discharge arrow points to flare, atmosphere or a closed system per the sheet note.

When you plan mechanical work, always list the isolation boundary and any relief valve that protects the opened system. See the pressure loop for a worked example.

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