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Local Fuel PLC – The Shoreham Oil Terminal
SIS Management of Functional Safety – Safety Plan
P & I Design Ltd
DOCUMENT NO:LP364004_RPT
2 Reed Street, Thornaby, UK, TS17 7AF
ISSUE: C DATE: 27.05.15
Tel: + 44 (0)1642 617444
PAGE 7 OF 28
Fax: + 44 (0)1642 616447
www.pidesign.co.uk6
FUNCTIONAL SAFETY ASSESSMENTS
In addition to roles, responsibilities, inputs, outputs and deliverables this document will
provide the control of the Functional Safety Assessment through the lifecycle of the SIS to
ensure the necessary objectives of functional safety are met. Functional Safety Assessments
(FSA) will be documented in separate documents but referenced within this document.
In accordance with BS EN 61511 the defined stages for FSA are:
Stage 1 – After the HAZOP and risk assessment has been carried out, the
required protection layers have been identified and the safety requirement
specification (SRS) has been developed.
Stage 2 - After the SIS has been designed.
Stage 3 After the installation, pre-commissioning and final validation of the
SIS has been completed and operating and maintenance procedures have been
developed.
Stage 4 – After gaining experience in operating and maintenance.
Stage 5 – After modification and prior to decommissioning of the SIS.
The number, size and scope of Functional Safety Assessments is decided upon specific
circumstances and considering the following:
Size of project;
Degree of complexity;
Safety integrity Level;
Duration of Project;
Consequence in the event of failure;
Degree of standardisation of design features;
Safety regulatory requirements;
Previous experience with a similar design.
The constitution of the FSA team is based upon the following:
The scope of the FSA;
Who is to participate in the FSA;
The skills, responsibilities and authorities of the FSA team
The information that will be generated as a result of the FSA;
The identity of any safety bodies if required;
The resources required to complete the FSA;
The level of independence of the FSA team;
The means by which the FSA will be revalidated after modifications.
BS EN 61511 states that at least one FSA shall be undertaken before the hazards are present.
6.1
Functional Safety Assessment Plan
It is envisaged that the following FSA’s will be conducted for this SIS:
Stage 3
Stage 4
Stage 5