ISA-5.1 Instrument Symbols and Identification System in P&ID
ISA-5.1 is the primary reference standard for instrument symbols and identification systems in P&IDs. Each instrument tag is composed of letters indicating the process variable and function, followed by a unique loop number. For example, the tag "PIT-201" means a Pressure Indicating Transmitter with loop number 201.
Frequently Asked Questions
What is the difference between dashed and solid lines in instrument symbols?
Dashed lines generally indicate pneumatic signals, dotted lines indicate electrical signals, and wavy lines indicate data/software signals.
Key Terms
- Instrument Bubble
- A circular symbol representing a single instrument on a P&ID, containing function identification letters and a loop number below.
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