Simbolos De Tuberias E Instrumentacion

P&ID SYMBOLS
ISA Symbols and Loop Diagrams

P&IDs
Piping and Instrumentation Diagrams or simply P&IDs are the “schematics” used in the field of instrumentation and control (Automation) The P&IDis used to by field techs, engineers, and operators to better understand the process and how the instrumentation is inter connected. Most industries have standardized the symbols according to the ISAStandard S5.1 Instrumentation Symbol Specification.

• Piping & Instrumentation Drawing (original) • Process & Instrumentation Diagram (also used) • Process Flow Diagram – PFD (simplified version ofthe P&ID)

Temperature Process
Using pictorial diagrams may be informative however it is not practical or CAD friendly especially in a multi-loop process.
Temperature Controller and RecorderTemperature Transmitter

Steam Pneumatic Control Valve Heat Exchanger

Building the P&ID
The P&ID will use symbols and circles to represent each instrument and how they are inter-connected inthe process.
Temperature Controller and Recorder

Temperature Transmitter Thermometer

Temperature Sensing Bulb

Pneumatic Control Valve

Tag Numbers
Tag “numbers” are letters and numbersplaced within or near the instrument to identify the type and function of the device.
TRC 206

TI 206

TT 206

Temperature Sensing Bulb

FCV 206

Tag Descriptors
The first letter is used todesignate the measured variable
X Y Z 123

The succeeding letter(s) are used to designate the function of the component, or to modify the meaning of the first letter.

Pressure Level FlowTemperature

Indicator Recorder Controller Transmitter

Tag Numbers
Tag “numbers” are letters and numbers placed within or near the instrument to identify the type and function of the device.Temperature Recording Controller
TRC 206

Temperature Transmitter
TT 206

TI 206

Temperature Indicator
Temperature Sensing Bulb

FCV 206

ISA S5.1 Identification Letters

Examples...