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03446 OVERCOMING THE CO2 ABSORBER CORROSION CAUSED BY REVAMP MODIFICATIONS

Picture for 03446 OVERCOMING THE CO2 ABSORBER CORROSION
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Product Number: 51300-03446-SG
ISBN: 03446 2003 CP
Author: Rahmat Safruddin and Aditya Pratama
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Due to the need for higher gas throughput, the CO2 Absorber including other parts of the Amine Unit of Badak LNG plant were revamped. The internal parts of the CO2 Absorber were modified from two-pass to four-pass trays by retaining the original vessel. To reduce the work as well as cost for post weld heat treatment (PWHT), it was decided to do non-welding modification by arranging the new tray support rings above the existing support rings fastened by bolts. This modification caused localized erosion corrosion of the internal vessel wall initiated by the deterioration of the gasket sealing the gap between the additional rings and the vessel wall. The vessel wall was eroded into grooves such that the remaining thickness at the eroded area was lower than the minimum code requirements. To fix the problem, the internal parts of the vessel were recently modified by welding the new tray support rings to the vessel wall. In addition, the grooves on the wall were repaired by lace welding to retain its original thickness. The vessel was post weld heat treated afterward at 650C (1202F) for four and a half-hours of holding time. The success and difficulties in carrying out insitu PWHT of the 104-mm thick, 5 m in diameter, and 36 m tall vessel are also discussed.
Due to the need for higher gas throughput, the CO2 Absorber including other parts of the Amine Unit of Badak LNG plant were revamped. The internal parts of the CO2 Absorber were modified from two-pass to four-pass trays by retaining the original vessel. To reduce the work as well as cost for post weld heat treatment (PWHT), it was decided to do non-welding modification by arranging the new tray support rings above the existing support rings fastened by bolts. This modification caused localized erosion corrosion of the internal vessel wall initiated by the deterioration of the gasket sealing the gap between the additional rings and the vessel wall. The vessel wall was eroded into grooves such that the remaining thickness at the eroded area was lower than the minimum code requirements. To fix the problem, the internal parts of the vessel were recently modified by welding the new tray support rings to the vessel wall. In addition, the grooves on the wall were repaired by lace welding to retain its original thickness. The vessel was post weld heat treated afterward at 650C (1202F) for four and a half-hours of holding time. The success and difficulties in carrying out insitu PWHT of the 104-mm thick, 5 m in diameter, and 36 m tall vessel are also discussed.
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