This Piping and Connecting Shapes CAD legend sheet is a comprehensive reference for P&ID and piping drawings. It includes common line types and connection/joint symbols used to clearly communicate how pipelines are routed, connected, and equipped—helping your drawings stay consistent and readable for design, fabrication, and commissioning teams.
The legend typically covers:
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Pipeline line types (major pipeline, straight line pipe, battery limit line, traced lines, multi-lines, arrows, etc.)
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Signal/controls lines (pneumatic control, electric signal line, binary signal lines, etc.)
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Connections & joints (butt weld, welded connection, sleeve joint, union, socket weld, screwed connection)
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Flanges & end caps (flange, flange cover/dummy cover, end caps)
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Piping accessories like reducers, orifice plate, flow indicator, strainers, hydrant, vents/drains, hose/flexible hose, and expansion joints
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Safety/utility symbols such as flame arresters, bursting disc, silencers, and related items (as shown in the sheet)
Use this CAD legend for:
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P&ID documentation sets and piping schematics
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Standard templates for MEP/process drafting teams
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Training and QA checks for consistent symbol usage
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Quick reference during coordination and shop drawing review