Human-machine interface generally

Root causes 4 and 5. Human-machine interface less than adequate. The labeling of the pipe was poor and confusing, the general ergonomics of the work situation was poor. 

A computer that provides the human-machine interface (HMl) for the operator. This computer collects general data such as ambient conditions, fuel temperature and flow rates, tip pressure, radiation fluxes and radiant fraction, locations of radiometers and microphones, and so forth. This computer is used to control the actual operation during a flare test. 

One last transformation of the hazard analysis technique that is worth investigating is the operations and support hazard analysis (O SH A). Most hazard analyses (and safety analyses, in general) are directed toward uncovering hardware design problems however, this is not the intent of an O SHA. Simply put, an O SHA identifies and evaluates the hazards associated with the operations of a system. As with all hazard analyses, it looks at hardware systems, software, facilities, support equipment, procedures, personnel, operating environment, natural environment, human-machine interfaces, and other interfaces, but with the telling difference of how all of these factors relate to the operation of the system by people. The O SHA is a very useful technique to understand how operations-focused hazards impact the system. It is not a human factors analysis. See Chapter 8 for more on human factors analysis. 

Generally, the use of BBNs to model the impact of MOFs aims to explicitly model their multilevel and hierarchical influences on the HEPs, as discussed in Li et al. (2012), Cai et al. (2013) and Martins Maturana (2013). Many of the influencing factors typically considered by HRA methods can be thought of having direct influence on the HEP, e.g. the quality of the human machine interface and the time available for the personnel to carry out their tasks. In contrast, many of those referred to as MOFs have indirect effects for example the management s commitment to safety influences the quality of personnel training, which then directly influences the HEP. The BBN ability to represent multi-level relations helps to model these types of hierarchies. Figure 1 shows an example of the hierarchical influences. 

This subsection should provide a description of the general philosophy followed in the design of the main control room. This should include a description of the layout of the main control room, with an emphasis on the human-machine interface. The electrical design standards for equipment located in the main control room have already been described in previous sections and need not be repeated here. If a formal design review (human factors review) for the control room has been performed in developing or upgrading the layout, the results of this review should be summarized in this section. 

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