Repair of Main Pass 69 Waterflood Platform
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 122, Issue 4
Abstract
Combination of structural repairs and galvanic (sacrificial) cathodic protection have hopefully extended the service life of an offshore reinforced concrete platform by 10–15 yr. The 18-yr-old structure had suffered severe corrosion-related deterioration because of shortcomings of the original design and exposure to both seawater and high-chloride brine leakage from the waterflood injection facilities. Several innovative repair techniques were used. The underwater sections of the columns were repaired using preplaced aggregate concrete. Embedded zinc anodes were used to protect the aboveand underwater portions of the reinforcement in the columns. The deck was repaired using cast-in-place concrete or shotcrete, and its underside was sprayed with metallized zinc for cathodic protection of the reinforcement. Another reinforced concrete platform in the Gulf of Mexico has been provided with an impressed current cathodic protection system, although the system was never activated (Tate et al. 1989). However, we believe this is the first application of galvanic cathodic protection on an offshore reinforced concrete platform in the Gulf of Mexico. This project proved that properly planned and executed concrete repairs can offer a much faster and economical alternative compared to replacement, even for severely deteriorated structures.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 122 • Issue 4 • July 1996
Pages: 165 - 171
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jul 1, 1996
Published in print: Jul 1996
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