1.1
FLOWSHEET SYMBOLS AND P&I DIAGRAMS 4
Scope 4
General 4
Application to Industries 4
Application to Work Activities 5
Application to Classes of Instrumentation and to
Instrument Functions 5
Extent of Loop and Functional Identification 5
Extent of Symbolization 5
Inclusion of the New S5.1 Standard (now
ANSI/ISA-5.01.01) in User/Owner
Documents 5
Definitions Related to Flowchart Diagram
Symbology 6
General 6
Definitions Related to Flowsheet Symbology 6
Identification System Guidelines 9
General 9
Instrument Index 10
Guideline Modifications 10
Multipoint, Multivariable, and Multifunction
Devices 10
System Identification 10
Loop Identification Number 10
Identification Letter Tables 11
General 11
Graphic Symbol System Guidelines 19
General 19
Guideline Modifications 19
Instrument Line Symbols 19
Measurement and Control Devices and/or
Function Symbols 19
Fieldbus P&ID Examples: DeviceNet 22
Multipoint, Multifunction, and Multivariable
Devices and Loops 23
Fieldbus Devices, Loops, and Networks 28
Comments and Exceptions (Including Non-
ISA Industrial Practice) 28
P&IDs: Practical Aspects and Practices in the
EPC Industry 28
1.2
FUNCTIONAL DIAGRAMS AND FUNCTION
SYMBOLS 31
ISA Functional Diagramming (EX-SAMA) 31
Instrument and Control Systems Functional
Diagramming 31
Equivalent P&ID Loop, Functional Instrument
and Electrical Diagrams 31
Functional Diagramming Symbol Tables 32
1.3
INSTRUMENT TERMINOLOGY AND
PERFORMANCE 46
Introductory Notes 46
Operating Conditions vs. Performance 47
Sources and References 47
Definition of Terms 47
Test Procedures 74
Calibration Cycle 75

Calibration Curve 75
Test Procedures 75
References 77
1.4
SYSTEM ACCURACY 78
Definitions of Terms 78
Language, Terminology, and Reality 78
Clarifying the “Accuracy” Statement 79
Terminology of Inaccuracy and Repeatability 79
The Accuracy Statement 80
Flow Measurement Example 80
Analog and Linear Devices—Traditional
Magnetic Flowmeters 81
Analog, Nonlinear—Orifice Plates 81
Digital Linear—Turbine Flowmeter 82
Combined System Accuracy 83
Basis 1 83
Basis 2 83
Temperature and Pressure Effects 84
Repeatability vs. Total Error 85
References 85
Configuration Tools 94
Device Configuration 95
Identification 96
Calibration 97
Monitoring 98
Simulation 98
Diagnostics 98
Reference 99
1.7
INSTRUMENT INSTALLATION 100
Cost 100
Installation Documentation 100
Physical vs. Schematic Documents 100
Safety in Design 100
Pipe and Tube Material 102
Electrical Installations in Potentially Explosive
Locations 103
Physical Support 103
Process Industries Practices 104
Bibliography 104

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