STUDY OF TEMPERATURE EFFECT AND HEATING MODE ON CORROSION UNDER INSULATION (CUI) PIPE A 53 Gr. B IN ACID ENVIRONMENT

• Main Author: Septrie Anggana, Gusti
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/41055
• Institution: Institut Teknologi Bandung

The research through experiment of Corrosion Under Insulation (CUI) on hot insulated pipe A 53 Gr. B (noncoated surface pipe) has been done on Metallurgy Laboratorium. The research is intended to understanding the mechanism and effect of CUI on noncoated surface pipe A 53 Gr. B which being hot insulated and heated by water (hot water temperature always maintained over 60oC). The experiment was done by circulating hot water (T ± 98oC) through pipes for ± 2 hours/day (except Saturday and Sunday) and for the rest, pipes were left in cold condition (T ± 25oC). Acid environment inside insulation was made by spraying acid fluid (pH = 4) to insulation through a hole (1 inch diameter) in metal jacket. Interpretation of the experiment’s results which were done through visual observation, mapping (API 579), morfology of pipe’s surface using optical microscope, calculation of mass loss and corrosion rate (CR) and measurement on depth of holes formed in the pipe’s surface had identified the type of corrosion is uniform with corroded surface areas are more than 80% while the mass loss and CR for pipe “A” is 10.91 gr and 0.585 mm/yr and for pipe “B” is 9.82 gr and 0.526 mm/yr with the deepest hole for pipe “A” is 1.356 mm depth and for pipe “B” is 1.289 mm. These results indicate the mixture between temperature’s rise and acid environment have made a faster corrosion rate with the depth of holes formed in pipe’s surfaces may reach up to 1/3rd of original pipe thickness (3.5 mm).