Piping & Instrumentation Diagram Series

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Drafting Guidelines for P&ID’s

  • Suitable  line thicknesses are shown at full sizes
  • Crossing lines must not touch-break lines going in one direction only. Break instrument lines crossing process and service lines.
  • Keep parallel lines at least 3/8″ inch apart.
  • Preferably draw all valves the same size-1/4-inch long is suitable-as this retains legibility for photographic reduction. Instrument isolating valves and drain valves can be drawn smaller, if desired.
  • Draw instrument identification ballons  1/4-inch up to 7/16th-inch diameter.
  • Draw trap symbols 3/8th-inch square

Next time:

Flow lines on P&ID

AZelaya

Total Cad Systems Inc.

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