Institut des sciences et techniques appliquées (ISTA)

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Browsing Institut des sciences et techniques appliquées (ISTA) by Author "Bounezour Hichem"

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    Oxidation Damage Analysis of Ferritic Alloy Steel Heater Tubes in Catalytic Reforming Unit
    (International Journal of Heat and Technology.Vol. 42, No. 2, pp. 390-398, 2024-04-30) ; Zennir Youcef ; Bounezour Hichem ;
    Reformer heater tubes operate in a complex environment involving high temperatures, pressure, and corrosive atmospheres. Depending on the operating conditions, several mechanisms can occur, such as creep, oxidation, high-temperature hydrogen attack, and carburization. This paper aims to evaluate the degradation degree of catalytic reformer heater tubes made of ferritic alloy-steel A 335 grade P22 based on a combination of inspection techniques, including visual inspection, microstructure observation, metallographic analysis, and mechanical properties testing. The results show severe oxidation and scaling occurring on the outer surface of the heater tube due to operating the tubes above recommended levels. Several recommendations are suggested to reduce the risk of thermal oxidation and prevent similar damages from reoccurring in the future.
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    Safety Integrity Evaluation of Crude Oil heater .According to IEC 61508 Standard
    (ALGERIAN JOURNAL OF SIGNALS AND SYSTEMS (AJSS).Vol. 7, Issue 2.pp 84-93, 2022-06-01) ; Zennir Youcef ; Bounezour Hichem;
    The main object of this paper is to evaluate safety barriers intervening against overpressure implemented on a crude oil heater using layers of protection analysis approach suggested in IEC 61508 (International Electrotechnical Commission) Standard for the determination of safety requirements are illustrated. Accident scenarios are pre-identified using Hazard an Operability approach, Fault tree approach is required for an effective risk assessment process. In order to better appreciate accident scenarios, P (Process Hazard Analysis Software Tool) is utilized to simulate them.