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| Reasons for Rapid Consumption of Anodes in Process Water Tank of FPSO |
| Received:November 17, 2018 Revised:April 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.04.024 |
| KeyWord:process water tank sacrificial anode rapid consumption depolarizer |
| Author | Institution |
| LIAO Hong-yue |
1. CNOOC China Co., Ltd. Zhanjiang branch, Zhanjiang , China |
| CAI De-chun |
1. CNOOC China Co., Ltd. Zhanjiang branch, Zhanjiang , China |
| JIANG Man-jun |
2. Shanghai Environment Project Technology Branch Company, Zhanjiang , China |
| WANG Qi,CHEN Ya-lin |
3. Marine Biology Institute of Shandong Province, Qingdao , China |
| CHEN Ya-lin |
4. NCS Testing Technology Co., Ltd., Qingdao , China; 5. CISRI Qingdao Research Institute for Marine Corrosion, Qingdao , China |
| ZHANG Wei |
4. NCS Testing Technology Co., Ltd., Qingdao , China; 5. CISRI Qingdao Research Institute for Marine Corrosion, Qingdao , China |
| YANG Zhao-hui |
4. NCS Testing Technology Co., Ltd., Qingdao , China; 5. CISRI Qingdao Research Institute for Marine Corrosion, Qingdao , China |
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| Abstract: |
| Objective To research the reason for rapid consumption of sacrificial anodes in process water tank of FPSO. Methods According to the test methods in national standard 17848-1999, through comparing water tank environment and common environment, the water tank environment was simulated based on data on electrochemical performance of anode on active service to monitor current and potential of the anode during working, to analyze the reason why the anodes in process water tank are consumed so fast. Results The electrochemical capacities of the anode were 2522.07, 2464.29 and 1943.74Ah/Kg respectively in 25 degrees Celsius, 25 degrees Celsius with air inflation and 65 degrees Celsius with air inflation. Besides, the intercrystalline corrosion of anode was the most serious in 65 degrees Celsius with air inflation. It showed that the temperature was the key factor that influenced electrochemical capacity. In the simulated process water tank environment, the anode current could go to 100 mA, but in diluted process water, one liter of process water was mixed with 5 liter of seawater, it only went to 45mA. It showed the process water contained plenty of depolarizer, which was another important factor for rapid consumption of the anode. Conclusion In the process water tank environment, the anodes has serious inter-crystalline corrosion which greatly affects the electrochemistry capacity of the anode and shortens its service life. The plenty of depolarizer in the process water increases the protection current density required by the cabin, increase the current anode and shortens the actual service life of the anode |
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