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The main challenges facing Oil & Gas industry is to maintain uninterrupted production, for that to preserve the assets in good condition to operate maximum attainbale life circle, thus to evade any upsets and to avoid major disastrous concerns. To achieve this objective, appropriate advanced suitable inspection methods reliable to the process / operating conditions of the assets has to be developed and implementd. Accordingly, having effective and competent inspection and maintenance management programs seems to be of significance to keep all the assets in process. Among all the inspection methods, the use of Non-Destructive Testing (NDT) methods is increasing rapidly due to their extraordinary advantages such as application easiness, high reliability, accuracy, limited time consumption, budget cost control and relatively uninterrupted productivity, which are of interest for asset management also who are involved with inspection and maintenance programs. Advanced NDT methods encourage companies to apply them for the inspection of flowlines which have the most criticality among all the processing equipments. Among all NDT methods, Radiographic Testing and Ultrasonic Testing are the most used and widely industry accepted test methods for the inspection of flowlines and assets. Any NDT methods are having own limitations, advantages and disadvantages. Hence, all NDT methods applied for the inspection on offshore production facilities has to be evaluated to see which ones have had more accurate and reliable results. The frequency of these methods is also investigated in this dissertation. Aforementioned evaluations reveal the most important influencing factors that can affect the frequency and accuracy of each particular NDT method. |
