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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: A DATE: 15.06.2015
Tel: + 44 (0)1642 617444
PAGE 3 OF 32
Fax: + 44 (0)1642 616447
www.pidesign.co.uk1
REVISION CONTROL
Rev Description
A
Original Issue prior to FSA Meeting and initial review
2
SCOPE & DEFINITIONS
2.1
Scope
Local Fuel plc – Shoreham Terminal has an Independent High Level Alarm system to
provide a SIL 2 rated automatic shutdown system to prevent gasoline storage tank overfills.
The overfill protection systems are required to comply with the international standard BS EN
61511.
Functional Safety Assessment (FSA) is a component part of the process to demonstrate
compliance with BS EN 61511 and that the system is providing the intended protection.
This report has been prepared as a Functional Safety Assessment Stage 5 “Modification”.
2.2
Definitions
The following abbreviations and symbols may be used within this document:
ALARP As low as reasonably practicable
BPCS Basic process control system
BSTG Buncefield Standards Task Group
CCF Common cause failure
COMAH Control of Major Accident Hazards Regulations
DC Diagnostic coverage
EC&I Electrical, Control and Instrumentation
E/E/PE Electrical/electronic/programmable electronic
E/E/PES Electrical/electronic/programmable electronic system
EMC Electro-magnetic compatibility
ESV Emergency Shutdown Valve
FAT Factory acceptance testing
FIT Failure in Time expressed as failures that can be expected in 10
9
device
hours of operation
FMEA Failure mode and effects analysis
FMEDA Failure mode effects and diagnostic analysis
FSA Functional Safety Assessment
FPL Fixed program language
FTA Fault tree analysis
FVL Full variability language
HAZOP Hazard and Operability Study
HFT Hardware fault tolerance
HMI Human machine interface