SI057002_MNL - Gasoline Overfill Protection SIS IMMEAS-SIS1 Management Manual

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Safety Instrument System
Tank Overfill Protection - Management of Functional Safety
P & I Design Ltd DOCUMENT NO: SI277102_RPT
2 Reed Street, Thornaby, UK, TS17 7AF ISSUE: B DATE:10.10.12
Tel: + 44 (0)1642 617444 PAGE 20 OF 22
Fax: + 44 (0)1642 616447
16.0 FUNCTIONAL SAFETY ASSESSMENT – STAGE 5 MODIFICATION
This assessment is to review the changes made by a modification to ensure that the SIS is not
compromised by the modification.
The FSA will address the following as a minimum:
 The recommendations and actions arising from previous FSA have been
resolved and completed;
 Review of the following;
o Description of the modification;
o Reason for the modification
o Hazards which may be affected by the modification;
o An analysis of the impact on functional safety as a result of the
proposed modification;
o Approvals for the modification;
o Test used to verify that the change was properly implemented and the
SIS performs as required.
 Assess how far within the SIS lifecycle to go back and review the impact of
the modification;
o LOPA
o SRS
o Design
o Installation
o Testing
o Operation
o Maintenance
 Review the status of operating manuals and documentation in respect to the
implemented modification;
 Plans or strategies for implementing further FSA’s are in place;
Roles and Responsibilities:
Immingham Storage Ltd:
Attendance of competent personnel relevant to the required disciplines to participate in the
FSA.
Personnel assigned to this phase to be detailed on completition of stage 4 Review
Design Consultant.
Attendance of competent personnel relevant to the design of the SIS. Provide the FSA team
with all necessary documentation. Update this Management of Functional Safety Document.
Personnel assigned to this phase to be detailed on competition of stage 4 Review