Volume 11, Issue 41 (11-2021)
مهندسی خوردگی 2021, 11(41): 35-43 |
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Fire Water Storage Tank Internal
Cathodic Protection System Resistance
Calculation Using Finite Element
Analysis. مهندسی خوردگی 2021; 11 (41) :35-43
URL: http://journal.ica.ir/article-1-162-en.html
URL: http://journal.ica.ir/article-1-162-en.html
Abstract: (492 Views)
For fire water storage tanks internal corrosion will occur due to internal surfaces are in contact with water. In oil
and gas industry in addition of coating, cathodic protection is used to reduce or mitigate internal corrosion.
According to dimensions of fire water tanks in petrochemical plants and refineries and high current density
requirements, impressed current system used for tanks internal protection. Generally suspended MMO tubular
anodes in string form used. These strings placed on circle with some offset from tank wall for uniform distribution
of current and potential. Due to close distance between anodes to tank shell and bottom plates, using conventional
formulas that assume reference potential at infinite distance will introduce error in calculated resistance, also
anodes distribution along string is not addressed in conventional methods. Anode system resistance affect
transformer-rectifier size in impressed current system, for tank internal cathodic protection this matter is
important due to effect on nozzles quantity and location for suspending anode strings that affect tank construction.
In this paper finite element analysis by COMSOL software and mathematical derivation used for calculation of
anode system resistance and results compared by conventional methods. According to the results it is observed
that error in calculated anode system resistance by conventional methods is more than 17% in comparison with
finite element analysis results.
and gas industry in addition of coating, cathodic protection is used to reduce or mitigate internal corrosion.
According to dimensions of fire water tanks in petrochemical plants and refineries and high current density
requirements, impressed current system used for tanks internal protection. Generally suspended MMO tubular
anodes in string form used. These strings placed on circle with some offset from tank wall for uniform distribution
of current and potential. Due to close distance between anodes to tank shell and bottom plates, using conventional
formulas that assume reference potential at infinite distance will introduce error in calculated resistance, also
anodes distribution along string is not addressed in conventional methods. Anode system resistance affect
transformer-rectifier size in impressed current system, for tank internal cathodic protection this matter is
important due to effect on nozzles quantity and location for suspending anode strings that affect tank construction.
In this paper finite element analysis by COMSOL software and mathematical derivation used for calculation of
anode system resistance and results compared by conventional methods. According to the results it is observed
that error in calculated anode system resistance by conventional methods is more than 17% in comparison with
finite element analysis results.
Type of Study: Research |
Subject:
General
Received: 2023/01/28 | Accepted: 2023/01/30 | Published: 2023/01/30
Received: 2023/01/28 | Accepted: 2023/01/30 | Published: 2023/01/30
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