STUDY OF P&IDs Presetation for piping engineering

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

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.

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

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.

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.

P&ID
Level Instruments i.e. LG, LC, LT etc.
Flame arrestor, rupture disc etc.

P&ID
P&ID depicts requirements /Special Reqts i.e.
BTL elevation of vertical vessels, columns etc.
Elevation of horizontal vessels.
Relative elevation of equipments i.e. Reboiler
& column.
No Pocket, free draining, long radius elbows.
2 phase flow, minimum no. of bends.
Spec. break.

P&ID
P&ID depicts requirements like
Heat Exchanger flushing & drain plan.
Pump vent/drain/bleeder connection details.
Standard CBD connection for vessels, Air
coolers.
Flue Gas/Steam purge connection for unit
flare header.
Sample cooler/collection details.

STUDY OF P&IDs Presetation for piping engineering

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STUDY OF P&IDs Presetation for piping engineering

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