📋P&ID (piping and instrumentation diagram)
🔸is a detailed diagram in the process industry that shows the piping and process equipment together with the instrumentation and control devices.
🔸P&IDs also play a significant role in the maintenance and modification of the process after the initial build.
🔸P&IDs are originally drawn up during the design stage.We make some deliverables at the FEED stage (front-end engineering design) but have all process deliverables detailed at the detail engineering development stage.
🔸The coordination of piping, instrumentation, electrical, and Process safety engineers is responsible for designing P&ID.
✏️Information we gain from P&ID:
🔹Line number, Line size, and Specification of the piping system.
🔹The flow direction of lines.
🔹All valves (Type of valve and identification of any special type of valve).
🔹Details about high-point vent (HPV), low-point drain (LPD), Special fittings, sampling points, reducers, spectacles, blinds, etc.
🔹permanent start-up and flush lines.
🔹Name and number of all equipment.
🔹Equipment-to-equipment connection details.
🔹Instrument name and number in a piping system.
🔹All control loops (Basic control loops and Advanced control loops).
🔹Insulation or Jacketing requirements.
🔹Vendor and contractor interfaces.
🗞️Limitations of P&ID:
▪️As P&ID is not drawn on a scale, it is unable to give you the exact dimensions of any piping system.
▪️Process conditions, Operation conditions, and Physical data can't be obtained from it.
▪️Equipment location can't be determined with the help of P&ID.
▪️The line route, length, fittings, supports, and structural details used for the piping network can't be determined.
💡We can get all this data from another drawing, like PFD, Isometric or 3D modelling.
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