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99036 TOP OF LINE CORROSION IN MULTIPHASE GAS LINES. A CASE HISTORY

Picture for 99036 TOP OF LINE CORROSION IN MULTIPHASE
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Product Number: 51300-99036-SG
ISBN: 99036 1999 CP
Author: Y.M. Gunaltun, D. Supriyam, J. Achmad
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Multiphase wet gas flow lines of Tunu field cross the Mahakam River at several locations. Even though the corrosion monitoring systems have shown negligible internal corrosion rates, inspection by intelligent pigging, after six years of service, of two of these flow lines indicated severe internal top of line corrosion (TLC). Corrosion occurred in three locations in one line and at two locations in the other one. The lengths of the corroded pipe sections vary between 10 and 100 meters. Further investigations showed that corrosion took place at locations where the pipes were in direct contact with river water. These were unburied pipe sections (doglegs or pipe sections where upheaval buckling occurred) being subject to heavy cooling and consequently heavy water condensation. A pipe portion was removed. Visual inspection and laboratory examination confirmed the proposed explanation. This paper describes in details the field operating conditions, presents the results of inspection and laboratory studies and describes remedial actions unshaken to solve the problem.

Key words: top of line corrosion wet gas line, water condensation upheaval buckling
Multiphase wet gas flow lines of Tunu field cross the Mahakam River at several locations. Even though the corrosion monitoring systems have shown negligible internal corrosion rates, inspection by intelligent pigging, after six years of service, of two of these flow lines indicated severe internal top of line corrosion (TLC). Corrosion occurred in three locations in one line and at two locations in the other one. The lengths of the corroded pipe sections vary between 10 and 100 meters. Further investigations showed that corrosion took place at locations where the pipes were in direct contact with river water. These were unburied pipe sections (doglegs or pipe sections where upheaval buckling occurred) being subject to heavy cooling and consequently heavy water condensation. A pipe portion was removed. Visual inspection and laboratory examination confirmed the proposed explanation. This paper describes in details the field operating conditions, presents the results of inspection and laboratory studies and describes remedial actions unshaken to solve the problem.

Key words: top of line corrosion wet gas line, water condensation upheaval buckling
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