This General Process Symbols Legend CAD sheet is a quick reference for P&ID and process plant drawings. It includes commonly used symbols for towers, reactors, furnaces, and major process units, helping you standardize diagrams and improve readability across projects.
The legend typically includes:
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Tower and cooling equipment symbols (crossflow/induced draft, counterflow/forced draft, chimney tower)
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Plate tower and packed tower icons
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Reactor and unit symbols such as fluidized reactor and other process vessels
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Major process unit references (as shown) like:
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Fluid Catalytic Cracking (FCC)
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Fluid Coking
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Hydrocracking
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Hydrodesulfurization (HDS)
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Alkylation
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Utility/plant items like tubular equipment, screens, transport/loader icons, and motor references
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Furnace symbols (multiple styles shown on the sheet)
Use this CAD legend for:
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P&ID documentation sets for oil & gas and industrial plants
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Standard templates for process engineering teams
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Training and QA reviews to keep symbols consistent
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Faster drafting with a ready-to-use symbol reference sheet