Energy trace and barrier analysis ETBA

A typical system safety task for hazard identification would be the preparation of a preliminary hazard list (PHL). Hazard identification or discovery is accomplished by reviewing lessons learned, accident reports, and other historical data. A PHL may be prepared through an informal conference, the use of checklists, and occasionally other techniques such as energy trace and barrier analysis (ETBA). 

The methods used for preparation of a PHL include informal conferencing and the use of checklists and/or energy trace and barrier analysis (ETBA). 

The recommended techniques for preliminary hazard analysis are energy trace and barrier analysis (ETBA) and failure modes and effects analysis (FMEA). Recommended techniques for system and subsystem hazard analyses are FMEA, fault tree analysis (FTA), common cause analysis, sneak circuit analysis (for electrical, electronic, and some hydraulic or pneumatic circuits) and, of course, software hazard analysis for software. 

Figure 18-8 Accident triangle. The incident , LTA barriers , and vulnerable target concept is the basis for Energy Trace and Barrier Analysis (ETBA) described in Chapter 13.

Figure 9.1 Sample energy trace and barrier analysis (ETBA) worksheet.

Fault (or Functional) Hazard Analysis (FHA) Management Oversight and Risk Tree (MORT) Energy Trace and Barrier Analysis (ETBA) Sneak Circuit Analysis (SCA)... 

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