Stabilizer column trays presence investigation using gamma scanning technique in petroleum refineries plant

In petroleum refinery plant, the stabilizer column is a crucial part in supporting the production process. In the present study, we found that the stabilizer column was not in optimal condition, hence, the internal structure is necessary to be investigated. Gamma scanning is one of the most effective and efficient techniques for investigating and observationof the column’s quality in petroleum refinery plants. This study aimed to investigate the use of the gamma scanning method to analyze the presence and condition of the tray inside the stabilizer column. The column (20,600 mm in height) has 25 trays inside, consisting of 11 single passes in the upper (ID: 1,100 mm) and 14 double passes in the lower (ID: 2,100 mm)segment. Scanning was carried out by placing the radiation source (Co-60, with the current activity of 1.77 GBq) and the detector (NaI(TI)) outside the column on opposite sides, then scanned from the bottom to top with 50 mm intervals at each data point and 2 s scanning time using gamma counter module (Ludlum). Scanning was carried out with 2 orientations and 1 orientation at the lower and the upper segment, respectively. Results showed that trays #1-#25 were in their positions, however, trays #12, #15, #19, and #25 were suspected of slight foaming, and tray #5 was suspected of slight weeping. There was an indication of liquid entrainment on trays #1 and #8. The presence and condition of the trays inside of the stabilizer column have been investigated using the gamma scanning technique without disturbing the production process. The results of the present study can be used as a reference or recommendation in preparing the turnaround maintenance (TAM) efficiently.