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eng Proposition for different life hazard curve for transformer and substation equipment
Grisaru, Marius
Transformers Magazine Vol. 6, No. 5, 2019
Today the classical bathtub curve model is the main model for life expectancy calculation of all the electrical equipment and, especially, all kind of oil-filled transformers. Most of the stakeholders and maintenance engineers make their decisions on tests, treatments and most importantly, replacement, on the bathtub curve concept. The costs that are associated with the classical bathtub curve are substantial, mainly driven by the unnecessary treatment or unnecessary replacements.
Hrčak ID: 228367


eng Operational failure assessment of Remotely Operated Vehicle (ROV) in harsh offshore environments
Nitonye, Samson; Adumene, Sidum; Orji, Charles Ugochukwu; Effiong Udo, Anietie
Pomorstvo Vol. 35, No. 2, 2021
For an effective integrity assessment of marine robotic in offshore environments, the elements’ failure characteristics need to be understood. A structured probabilistic methodology is proposed for the operational failure assessment (OFA) characteristics of ROV. The first step is to assess the likely failure mode of the ROV system and its support systems. This captures the interaction and failure induced events during operation. The identified potential failure modes are further developed into logical connectivity based on the cause-effect rela...
Hrčak ID: 267182


eng Derivation of Pareto Optimal Operating Policies Based on Safety Indices for a Catalytic Multi-tubular Reactor Used for Nitrobenzene Hydrogenation
Maria, G.; Khwayyir, H. H. S.; Dinculescu, D.
When highly exothermic/hazardous reactions are conducted in the presence of parametric uncertainty, derivation of optimal operating policies for a chemical reactor has to simultaneously consider several objectives of sustainability. The paper uses an original methodology to generate the Pareto optimal solutions when reactor productivity and safety objectives (expressed in probabilistic terms) are simultaneously considered using the process and reactor model in a simple way, in the presence of technological constraints, uncertainty in safety bou...
Hrčak ID: 167257