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Gasoline Overfill Protection
Safety Instrument System Stage 1 Functional Safety Assessment
P & I Design Ltd
DOCUMENT NO: SI277014_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 16.02.12
Tel: + 44 (0)1642 617444
PAGE 6 OF 12
Fax: + 44 (0)1642 616447
www.pidesign.co.uk2.4
Definitions and Abbreviations
The following details the definitions and abbreviations used in this document.
AICHE
American Institute of Chemical Engineers
BPCS
Basic Process Control
BSTG
Buncefield Standards Task Group
E/E/PE
Electrical Electronic and Programmable Electronic
ESD
Emergency Shutdown
FSA
Functional Safety Assessment
HMI
Human Machine Interface
HSE
Health and Safety Executive
LOPA
Layers of Protection Analysis
MTBF
Mean Time Between Failures
OPRT
Overfill Protection Regulatory Team
PLC
Programmable Logic Controller
PSLG
Process Safety Leadership Group
PFD
Probability of Failing on Demand
PSLG
Process Safety Leadership Group
SIF
Safety instrumented function – An E/E/PE function with a specified
safety integrity level which is necessary to achieve functional safety
SIL
Safety integrity level – A numerical number, 1 to 4 stipulating the
level of integrity the system shall perform to, 1 being the lowest 4 the
highest
SIS
Safety Instrument System – A SIS comprises of sensors, logic solvers
and final elements
SRS
Safety Requirement Specification
TSA
Tank Storage Association
UKPIA
United Kingdom Petroleum Industry Association