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Local Fuel plc - Shoreham Oil Terminal
Safety Instrument System Functional Safety Assessment Stage 5
P & I Design Ltd
DOCUMENT NO: LF364100_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: B DATE: 07.06.2016
Tel: + 44 (0)1642 617444
PAGE 4 OF 51
Fax: + 44 (0)1642 616447
www.pidesign.co.ukHMI Human machine interface
HSE Health & Safety Executive
HSL Health & Safety Laboratories
HRA Hazard risk assessment
HRA Human reliability analysis
IHLA Independent High Level Alarm
LOPA Layer of Protection Analysis
LVL Limited variability language
MIIB Major Incident Investigation Board
MOC Management of Change
MODBUS a serial communications protocol originally published by Modicon
MooN “M” out of “N”
MTBF Mean Time Between Failure
MTTR Mean Time to Repair
P&I Process and Instrumentation
PE Programmable electronics
PES Programmable electronic system
PFD Probability of failure on demand
PFD
avg
Average probability of failure on demand
PFD
g
Group probability of failure on demand
PLC Programmable logic controller
PSLG Process Safety Leadership Group
ROSOV Remotely Operated Shutoff Valve
RTC Risk Tolerance Criteria
PVST Partial Valve Stroke Testing
SAT Site acceptance test
SCADA Supervisory Control & Data Acquisition
SFF Safe failure fraction
SIF Safety instrumented function
SIL Safety integrity level
SIS Safety instrumented system
SMS Safety Management System
SRS Safety requirement
T
1
Proof Test Interval
TORA Trip Override Risk Assessment
UPS Uninterruptible Power Supply
β
= Common Cause Failure Fraction
β
D
= Detected Common Cause Failures
λ
= Failure rate (per hour)
λ
D
= Dangerous Failure Rate
λ
DD
= Dangerous Detected Failures
λ
DU
= Dangerous Undetected Failures
λ
SD
= Safe Detected Failures
λ
DU
= Safe Undetected Failures