P&ID diagrams, also known as Piping and Instrumentation Diagrams, are used to map out the design of engineering systems in various industries. These diagrams are essential for problem identification and troubleshooting, as they provide a clear representation of the system's components and their interconnections. It is very important to know P&ID symbols to read P&ID diagrams because these diagrams use a set of standardized symbols to represent heat transfer equipment, pumps, compressors, valves, instrumentation, and other components of a process system.
Typical PID symbols for Heat Exchangers - Typical P&ID symbols for air coolers, spiral exchangers, plate and frame exchangers, double pipe heat exchangers, kettle type exchangers and shell and tube exchangers, boilers, condensers, and cooling towers are presented.
Typical PID symbols for Pumps and Compressors - Symbols used for different types of pumps and compressors in P&ID diagrams are presented here.
Pumps
Compressors
Typical PID symbols for Instrumentation Signals - These are symbols used for instrumentation lines, sensing devices & detectors, indicators & recorders and recorders in P&ID diagrams.
Instrumentation lines symbols
Sensing Devices and Detectors
Indicators and Recorders
Controllers
Typical P&ID symbols for Storage Tanks and Vessels - Symbols are presented for conical storage tanks, floating roof tanks, spherical tanks, horizontal and vertical drum, etc.
Typical PID symbols for control valve actuators - Symbols used for different types of actuators used to operate control valves in a process plant have been discussed here.
Typical P&ID symbols for Safety Valves - Symbols used in P&ID diagrams are presented for pressure relief valves, vacuum relief valves, breathing valves, pressure rupture discs, vacuum rupture discs, etc.
Typical P&ID symbols for valves - Symbols are presented for different types of valves such as gate valves, ball valves, check valves, globe valves, butterfly valves, plug valves, needle valves, 3-way valves, angle valves, auto-recirculation valves, etc.
Typical PID symbols for piping fittings - Symbols used in P&ID diagrams are presented for fittings such as flanges, spool pieces, strainers, reducers, spacers, spectacle blinds, and other special fittings.
