Acronyms related to Safety Instrumented System


ALARP - as low as reasonably practicable
BPCS - Basic process control system
FTA - Fault tree analysis
HAZOP - Hazard and operability analysis
IPL - independent protection layer
LOPA - layers of protection analysis
MTTR - Mean time between failure
PFD - Probability of failure on demand
PHA - Process hazard analysis
SIF- Safety instrumented function
SIS - Safety Instrumented System
SRS - Safety requirement specification
QRA - Quantitative risk analysis