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Immingham Storage Co Ltd - East Terminal
Gasoline Storage Tanks Overfill Safety Instrument System - Functional Safety Assessment Stage 2/3
P & I Design Ltd
DOCUMENT NO: SI277016_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: D DATE: 25.04.13
Tel: + 44 (0)1642 617444
PAGE 30 OF 33
Fax: + 44 (0)1642 616447
www.pidesign.co.uk5
CONCLUSIONS
5.1
FSA meeting
All actions arising from the FSA are to be completed as soon as possible and by end of the 2
nd
quarter 2012 and a review carried out.
The Safety Lifecycle documentation reviewed at this FSA was provided by Immingham
Storage Company East.
Following this FSA assessment and the comments from the HSE it appears that there may be
lifecycle documentation incomplete, missing or not available at this time.
Life-cycle documentation:
Management of Functional Safety Document to be updated following the FSA.
(Action 18)
Safety Requirement Specification to be revised to include comments from FSA.
(Action 19)
SIS Design Dossier to be issued.
System Overview and design documentation to be revised to include comments from
FSA. (Action 20)
Modification and Management of Change Procedures to be updated and reviewed.
(Action 6)
This Functional Safety Assessment concludes that the Probability of Failure on Demand
calculation and hardware fault tolerance meet the requirements of a SIL 2 Safety Instrumented
System and that the system has been maintained and tested to ensure functional safety.
It was agreed at the FSA that continuing field reliability data would be obtained for analysis
against the calculated data.
As a result of this FSA, Immingham Storage Company East Terminal will modify some of
their management procedures and documentation to ensure that all aspects of the safety
lifecycle, see Action list, are in line with BS EN 61511.