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51315-6012-ICCP Retrofit Challenges for an Offshore Jacket Complex

Picture for ICCP Retrofit Challenges for an Offshore Jacket Complex
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Product Number: 51315-6012-SG
ISBN: 6012 2015 CP
Author: Christophe Baete
Publication Date: 2015
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$20.00
$20.00
Christophe Baeté CP ManagerElsyca n.v.Vaartdijk 3/603 3018 Wijgmaal Belgiumchristophe.baete@elsyca.comAn old jacket complex consisting of 4 platforms is protected by a conventional sacrificial anode system. Recent surveys have indicated that extending end service life with a minimum of 20 years requires a significant retrofit effort. Since replacement of individual anodes on a like-for-like basis would be very expensive a retrofit option based on remote impressed current anode sleds was considered offering very considerable cost savings. Additional a fifth platform is planned in the future.Remote ICCP anode sleds are relative easy to install but the design of such a CP system is more challenging. Correct positioning of the sleds is critical for obtaining proper protection and avoiding overprotection. In this particular project the availability of target locations was limited because of various subsea pipelines connected to the platforms and two large jack-up zones that should remain accessible.The feasibility of using an ICCP system was therefore investigated through computational modeling. First the as-is CP status of the complex was simulated taking into account the current depletion of the sacrificial anodes as observed during the latest survey. Secondly an ICCP system was included in the model and different anode sled positions were investigated until an optimal design was obtained. The remaining life of the anodes was re-calculated such that the amount of anode sleds was kept to a minimum. Through modeling the CP effectiveness of the combined system was validated and cost-effective solution was proposed.Keywords: jacket complex ICCP retrofit computational modeling
Christophe Baeté CP ManagerElsyca n.v.Vaartdijk 3/603 3018 Wijgmaal Belgiumchristophe.baete@elsyca.comAn old jacket complex consisting of 4 platforms is protected by a conventional sacrificial anode system. Recent surveys have indicated that extending end service life with a minimum of 20 years requires a significant retrofit effort. Since replacement of individual anodes on a like-for-like basis would be very expensive a retrofit option based on remote impressed current anode sleds was considered offering very considerable cost savings. Additional a fifth platform is planned in the future.Remote ICCP anode sleds are relative easy to install but the design of such a CP system is more challenging. Correct positioning of the sleds is critical for obtaining proper protection and avoiding overprotection. In this particular project the availability of target locations was limited because of various subsea pipelines connected to the platforms and two large jack-up zones that should remain accessible.The feasibility of using an ICCP system was therefore investigated through computational modeling. First the as-is CP status of the complex was simulated taking into account the current depletion of the sacrificial anodes as observed during the latest survey. Secondly an ICCP system was included in the model and different anode sled positions were investigated until an optimal design was obtained. The remaining life of the anodes was re-calculated such that the amount of anode sleds was kept to a minimum. Through modeling the CP effectiveness of the combined system was validated and cost-effective solution was proposed.Keywords: jacket complex ICCP retrofit computational modeling
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