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Application of Hazard Tree Analysis in Hazard Identification of Steam Boiler Mill
Preliminary Hazard Analysis PHA
Hazard Tree Analysis HTA
|上傳時間: ||2013-06-27 11:47:51 (UTC+8)|
The steam generated from steam boiler is the main source of power to support petrochemical plants operations. Even equipped with automatic control system and multiple safety interlocks to the boiler, unfortunately, boiler accidents still occur frequently. Violations to the specified equipment maintenance schedules and procedures are the main reasons for accidents to occur. In addition, the operator errors are also known to contribute to the accidents. There are three main areas in the stream boiler plant: (1) boiler area (consists of heavy oil area, feeding water area, and the reagent area), (2) denitrification and (3) desulfurization. In this thesis, we selected a boiler plant of an unnamed company as our study object. By using the techniques of PHA and HTA, we intended to find the potential risks of the boiler and to compare the accuracy of these two techniques on the identification of the hazards. We also tried to incorporate the effect of the severity to the HTA to demonstrate the root causes of the accidents and the corresponding degree of severity of the accidents. Results show that PHA can only find common hazards to influence the process. However, HTA can promptly and clearly provide significant clues to the potential hazards of a process, deviation from intended design, and root causes. Thus, HTA offers better recommendations to prevent accidents from occurring. We also find that by incorporating the severity of accidents into HTA analysis, we found some characteristics as follow: (1) the entire process, instead of its individual sections of the process, is considered when the risk analysis is conducted, (2) the degree of the accident occurrence can be categorized by different colors representing the degree of severity, (3) we can clearly picture the severity and the actions to prevent the accidents from happening; such as to control the deviation of process to happen or to the occurrence to happen by improving the process at design stage or after process had been implemented.
|Appears in Collections:||[職業安全衛生系(含防災所)] 期刊論文|
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