Nomenclature

Symbology

The following is a list of symbology used throughout this guide. Units are SI unless otherwise specified.

Description	Symbol	Unit
Density
Entropy change of vapourisation
Ideal gas constant		8.314
Latent heat

Acronyms

Abbreviation	Description
CCS	Carbon Capture and Storage
DCS	Distributed Control System
ESD	Emergency Shutdown
FAT	Factory Acceptance Test
FSA	Functional Safety Assessment
HAZOP	Hazard and Operability Study
HRA	Hazard and Risk Assessment
LOPA	Layer of Protection Analysis
MCC	Motor Control Centre
PFD	Process Flow Diagram
PFD	Probability of Failure on Demand
PID	Proportional, Integral, Differential (controller)
PST	Process Safety Time
RRF	Risk Reduction Factor
SAT	Site Acceptance Test
SIF	Safety Instrumented Function
SIL	Safety Integrity Level
SIS	Safety Instrumented System
SRS	Safety Requirements Specification