HEAL SECTION TITLE TH & SAFETY


Maximum assessed consequence level and already assessed event frequency are defining risk level for each DFS, with respect to defined risk acceptance criteria, as defined by the risk matrix.


SAFETY SYSTEMS SELECTION As a minimum, safety systems shall be selected to meet local and end- client requirements, regardless of the initially assessed risk level. Having this new information, possible fire scenario duration should be reassessed, as well as possible consequences to human, environment, company reputation and financial impact. Risk shall be re-assessed based on new consequence level and already assessed event frequency. Te analysis is finished if risk levels for all the DFSs are acceptable or at least ALARP. Otherwise, for intolerable risks levels additional measures should be taken. Each risk should be re-assessed with the same principle as described above. For ALARP risk levels, more consideration on whether it is reasonable to invest in additional safety systems is necessary.


A PRIME EXAMPLE One recent real-world example demonstrates this method in use. For this project, ILF was preparing the FEED design for a large gas pipeline project including compressor stations. Tis example shows the most interesting part of analysis for gas compressor train (only one DFS). Initial risk assessment showed an intolerable risk level, caused mainly by extreme financial impact due to very long business interruption. After several iterations, the decision was made to provide an automatic CO2


system covering compressor


enclosure and extinguish possible fires on the compressor lubricating system. Re-assessment showed that risk is ALARP, and the tool allowed for all the decisions to be recorded and transparently presented (see Fig. 2).


Robert Poljak is senior safety engineer at ILF. www.ilf.com


Fig.2. Gas compressor train analysis


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