1. STUDY OF P&IDs
• What is P&ID and what does it consist of?
• P&ID stands for Piping & Instrumentation
Diagram.
• P&ID can be categorized into the following:-
a) Standard Symbols & Nomenclature.
b) General Notes & Typical Symbols.
c) Process P&IDs (Licensor / EIL)
d) Utility P&IDs
2. STUDY OF P&IDs
• Who makes P&IDs ?
a) Process Department – For Units
b) POSD – For Offsites
For utility services i.e. Steam, Air, Water, DM Water,
Nitrogen, etc.
For Loading / Unloading systems (Loading / Unloading
Gantries)
Flare System
Process distribution / Interconnection
c) Gen. Civil – PFDs for Oily Water Sewer, Fire Water
etc.
3. STUDY OF P&IDs
• P&ID shows interconnection of piping
between different equipments & this is the
basis on which piping is done in the plant.
• Each line is designated with a line number i.e.
24”-P-114-3301-A1A-IH
Size Service unit no. Line no. spec. Insul type
4. STUDY OF P&IDs
• P&ID depicts the requirement of the
following piping items:-
Valves i.e. Gate, Globe, Ball, Check, Plug,
Needle, Diaphragm, Butterfly etc.
Strainers i.e. Temp. (Cone, Tee), Permanent
(Tee, Y), Basket
Motor operated valves (MOVs)
Spectacle Blinds, Hoses
Steam Traps, Air Traps etc.
5. STUDY OF P&IDs
• P&ID depicts the requirement of the
following instrumentation tagged items:-
Control Valves, safety valves etc.
Pressure Instruments i.e. PI, PT, DPT etc.
Temp. Instruments i.e. TI, TE etc.
Flow Instruments i.e. FE (Orifice), Turbine
meter, PD meter, Rota meter, Sonic meter,
Magnetic meter, Pitot tube, Annubar, Venturi
meter, straightening vanes etc.
