The Preliminary Hazard Analysis Report

Fundamentally, certain basic questions must be asked when developing the PHA. Although some may seem obvious or somewhat simplistic, they should stiff be considered. If such questions are not asked, the system safety professional runs the risk of conducting an incomplete analysis. All too often, the most obvious or visible may tend to conceal some associated level of risk of exposure to a hazard(s). Basic questions that should be resolved include 

Once all the data have been evaluated and the PHA worksheet is completed, a formal report should be written documenting the results of the analysis. The narrative report typically includes a summary of all significant findings associated with operational 

GENERIC HAZARD EVALUATION CHECKLIST SYSTEM/PROGRAM PERFORMED BY DATE  

In an effort to demonstrate the utDity of the preliminary hazard list and the preliminary hazard analysis in the initial evaluation of system risk, an example of a simple vapor degreaser in a manufacturing facility will be examined. This illustration will utilize the PHL in the development of the PHA in the method discussed earlier in this chapter. However, it must be noted from the outset that this example is intended 

---

Hazard Condition Item 2 Loss of Hydraulic Pressure. A small leak in the hydraulic cylinder system woidd result in a loss of pressure in the cylinder and a subsequent inability to maintain constant cyUnder volmne. Any damage to the cylinder jackhead would cause a leak of hydrauhc oil from the cylinder system. Such damage is possible because of an abrupt contact with the plunger mechanism and/or a failure in the neoprene seal between the jackhead and the plunger. The system safety analyst has learned from the preliminary hazard analysis report that there is no provision for oil recovery in the event of damage to the jackhead. 

---