With an eye to obtain more conservative assess results for pressure equipments, three subjects will be differentiated between the evaluation of corrosion rate, failure probability of pressure vessels and pressure safety valve (PSVs) in this book. First, a statistical methodology was proposed to modify the assessment of estimated corrosion rates for the pressure components in conventional methodology. Furthermore, the estimated corrosion rates will be used to assess the failure probability of the pressure components. By adopting First Order Second Moment (FOSM) method, the failure probability is approached for the pressure components. Moreover, for the sake of optimize the inspection and maintenance resources, typical semi-quantitative risk based inspection (RBI) methodology to each pressure vessel are proposed in safety management based on the approached failure probability. Besides, the final protection for the pressure equipments when the pressure systems were upset - PSVs, are also play important roles to safety management for pressurized system. So, follow the semi-quantitative RBI methodology, the evaluation schemes and the suggested inspection interval were established.

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