Phase Hazard Analysis

Phase hazard analysis processes work very well for construction projects and other settings with rapidly changing work environments. Consider phase hazards as a new or unique set of hazards not present during operations. Prior to transitioning to a new phase, conduct an analysis to identify and evaluate new or potential hazards. Use the information gained through analyses to develop action plans that can ensure implementation of appropriate controls. 

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Each company may require different types of hazard analyses, depending on the company s role, the size and complexity of the worksite, and the nature of associated hazards. The company may choose to use a project hazard analysis, a phase hazard analysis, or job safety assessment. 

A phase hazard analysis may be performed for those phases of the project for which the project hazard analysis has identified the need for further analysis, and for those phases of the project for which methods or site conditions have changed since the project hazard analysis was completed. The phase hazard analysis is performed prior to the start of work on that phase of the project and is expanded, based on the results of the project hazard analysis, to provide a more thorough evaluation of related work activities and site conditions. As appropriate, the phase hazard analysis should include... 

A job safety assessment or analysis should be performed at the start of any task or operation. The designated competent or authorized person should evaluate the task or operation to identify potential hazards and determine the necessary controls. This assessment should focus on actual worksite conditions or procedures that differ from or were not anticipated in the related project or phase hazard analysis. In addition, the authorized person should ensure that each employee involved in the task or operation is aware of the hazards related to the task or operation and of the measures or procedures that workers and visitors must use to protect themselves. Note The job safety assessment is not intended to be a formal, documented analysis, but instead is more of a quick check of actual site conditions and a review of planned procedures and precautions. A more detailed explanation of job safety analysis is provided in Chapter 12. 

Phase hazard analysis is a useful tool for construction and other industries that involve a rapidly changing work environment, different contractors, and widely different operations. A phase is defined as an operation involving a type of work that presents hazards not experienced in previous operations, or an operation where a new subcontractor or work crew is to perform work. In this type of hazard analysis, before beginning each major phase of work, the contractor or site manager should assess the hazards in the new phase. Appropriate supplies and support are coordinated as well... 

There are two approaches to ERS design. One is system modeling, which identifies the cause of a pressure rise from a hazard analysis. It uses approximate models—allvapor flow, all-liquid flow, or two-phase flow—to simulate the pressure increase of the reacting system vs. time and to determine vent size. The method is complex since it must identify the stoichiometry, the mechanism, and the kinetics of the decomposition causing the pressure rise. Two pressure models are used for vent sizing ... 

The hazards posed to a medical device associated with its manufacture should also be included. Complex arrangements may require multiple phases of hazard analysis. 

Figure 5.9 shows a dashed line from the Client Review back to the Draft Report. This indicates that some iteration will be going on at this phase of the report writing process. The client will be asked to ensure that the hazards analysis meets his or her needs, and that the findings and risk rankings are clearly understood. 

The second phase of the program will be more concerned with achieving quantified improvements in the facility s safety and environmental results. This phase is likely to emphasize elements such as Incident Investigation and Process Hazards Analysis in order to identify weak spots in the management systems. 

There should be no need for a process hazards analysis during Phase IV— all design decisions should have been pretty much finalized. A final HAZOP smdy and/or checklist review may be needed to close any outstanding issues and to make sure that late changes have been properly analyzed. 

There should be no need for a detailed hazards analysis during Phase V. 

T/F) The idea behind a process hazards analysis is to identify the hazards of the process in the design phase. 

Phase / Precapital Review. This review is to be completed prior to submission of a project request or a request for equipment purchase, in accord with the capital levels outfined in Bulletin 246. Precapital reviews are crucial for planning facilities needs such as appropriateness of location, power supply, plumbing, exhaust ventilation, et cetera. Process and project feasibility are determined through this review. A complete What-If hazard analysis, in accord with Bulletin 135, is to accompany the request. Noncapital projects should also be reviewed utilizing these procedures, but a formal What-If hazard analysis is not required. 

Hazard Analysis. The second assumption is that developers have access to information on the dysfunctional behaviour of the components usually utilized in design. This base of information can be the result of studies on previous exploitations of similar components in systems already in use. In (David ef a/. 2009), we proposed a way to formalize this database using SysML. If such a database is unavailable, the process will contribute to building one, but the automatic phases will be less efficient. 

The DECRIS RVA has two phases Phase 1 consists of a risk screening of undesired events, and is similar to a preliminary hazard analysis (PHA). Phase 2 consists of the following steps ... 

In addition to the techniques used during the concept phase, change analysis should be used to identify any new hazards resulting from changes made during the design phase. 

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