A SAFOP review of an electrical system is normally imple-mented at the specification and/or the engineering stage of a project, but can be equally applied to existing installations.
For a project, the timing of the individual SAFOP studies is dependent on design having progressed to a level of detail that will enable the objectives of each SAFOP study to be realised. However the project should still be at a stage that will allow implementation of the recommendations to occur without incurring significant costs.
An initial SAFOP study incorporating a SAFAN & SYSOP, should be ideally carried out on completion of the concep-tual design of the installation, i.e. after completing the Basis of Design documents and prior to tendering for preparation of the project specification by a contractor. Documentation which should be made available for the initial study includes conceptual initial layouts, single line diagrams, protection philosophies and central ideas.
A final SAFOP study incorporating the SAFAN, SYSOP & OPTAN studies should be implemented during the execution phase of a project, when the plant layout drawings and the electrical protection and control facilities are defined in sufficient detail, with main equipment details known. |