Safety Critical Element Management Manual



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Figure 5: Bow-tie model
Top event
Threat Threat Threat 1
Barrier
Barrier
Escalation factor
Escalation factor control
Escalation factor control
Escalation factor control
Escalation factor control
Escalation factor
HSE critical elements
HSE critical tasks Engineering Maintenance Operation
Hazard
Consequence Consequence Consequence 1


1. Identify SCEs and performance standards
1.2
Identify barriers and SCE groups
This section describes the roles and hierarchy of barriers,
hardware barriers and SCE groups, which start to be used during the early project phases and continue into the Operate phase.
Barriers
The role of a barrier is to prevent or limit the consequences of a major incident. Barriers maybe design features, e.g. separation distances hardware, e.g. pressure relief valve, fire detection system processes, e.g. lockout tag out operational intervention tasks, e.g. plant monitoring/shutdown.
This manual covers only the management of critical hardware barriers, whilst the other barriers are covered in HSE and other management systems.

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