The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform

Keith Bethune - One of the best experts on this subject based on the ideXlab platform.

  • a new equation for potential attenuation and Anode Current Output projection for cathodically polarized marine pipelines and risers
    Corrosion, 2000
    Co-Authors: Patrick Pierson, William H Hartt, Keith Bethune, P Anathakrishnan
    Abstract:

    Abstract A first principles based equation for potential attenuation along a marine pipeline or riser that was cathodically polarized by multiple, equally spaced, identical galvanic Anodes and that...

  • potential attenuation and Anode Current Output determination alternatives for marine pipelines and risers
    Corrosion, 1999
    Co-Authors: William H Hartt, Patrick Pierson, Keith Bethune
    Abstract:

    Potential attenuation along a pipeline that is catholically polarized by multiple, equally spaced Anodes is evaluated using three approaches boundary element modeling, a newly developed attenuation equation, and the classical equation of Uhlig, where the first two consider the net resistance to be comprised of electrolyte (Anode), coating, and metallic path components, whereas the last approach neglects electrolyte resistance. It is demonstrated that results from the BEM analysis correspond to a first principles based projection of resistance change along a pipeline; and so results obtained by this method (BEM) are judged to be the most accurate of the three. Distinctions between the BEM and the newly developed attenuation equation, which is also first principles based, are discussed in terms of assumptions that are made in arriving at a closed form solution to the latter. The Uhlig equation is judged to be the least accurate of the three and to be non-conservative. While the closed form solution for the newly developed equation projects a potential attenuation that is non-conservative, the corresponding Anode Current Output is conservative. Based upon this, a protocol for design of galvanic cathodic protection systems upon marine pipelines is proposed.

Patrick Pierson - One of the best experts on this subject based on the ideXlab platform.

  • a new equation for potential attenuation and Anode Current Output projection for cathodically polarized marine pipelines and risers
    Corrosion, 2000
    Co-Authors: Patrick Pierson, William H Hartt, Keith Bethune, P Anathakrishnan
    Abstract:

    Abstract A first principles based equation for potential attenuation along a marine pipeline or riser that was cathodically polarized by multiple, equally spaced, identical galvanic Anodes and that...

  • potential attenuation and Anode Current Output determination alternatives for marine pipelines and risers
    Corrosion, 1999
    Co-Authors: William H Hartt, Patrick Pierson, Keith Bethune
    Abstract:

    Potential attenuation along a pipeline that is catholically polarized by multiple, equally spaced Anodes is evaluated using three approaches boundary element modeling, a newly developed attenuation equation, and the classical equation of Uhlig, where the first two consider the net resistance to be comprised of electrolyte (Anode), coating, and metallic path components, whereas the last approach neglects electrolyte resistance. It is demonstrated that results from the BEM analysis correspond to a first principles based projection of resistance change along a pipeline; and so results obtained by this method (BEM) are judged to be the most accurate of the three. Distinctions between the BEM and the newly developed attenuation equation, which is also first principles based, are discussed in terms of assumptions that are made in arriving at a closed form solution to the latter. The Uhlig equation is judged to be the least accurate of the three and to be non-conservative. While the closed form solution for the newly developed equation projects a potential attenuation that is non-conservative, the corresponding Anode Current Output is conservative. Based upon this, a protocol for design of galvanic cathodic protection systems upon marine pipelines is proposed.

William H Hartt - One of the best experts on this subject based on the ideXlab platform.

  • a new equation for potential attenuation and Anode Current Output projection for cathodically polarized marine pipelines and risers
    Corrosion, 2000
    Co-Authors: Patrick Pierson, William H Hartt, Keith Bethune, P Anathakrishnan
    Abstract:

    Abstract A first principles based equation for potential attenuation along a marine pipeline or riser that was cathodically polarized by multiple, equally spaced, identical galvanic Anodes and that...

  • potential attenuation and Anode Current Output determination alternatives for marine pipelines and risers
    Corrosion, 1999
    Co-Authors: William H Hartt, Patrick Pierson, Keith Bethune
    Abstract:

    Potential attenuation along a pipeline that is catholically polarized by multiple, equally spaced Anodes is evaluated using three approaches boundary element modeling, a newly developed attenuation equation, and the classical equation of Uhlig, where the first two consider the net resistance to be comprised of electrolyte (Anode), coating, and metallic path components, whereas the last approach neglects electrolyte resistance. It is demonstrated that results from the BEM analysis correspond to a first principles based projection of resistance change along a pipeline; and so results obtained by this method (BEM) are judged to be the most accurate of the three. Distinctions between the BEM and the newly developed attenuation equation, which is also first principles based, are discussed in terms of assumptions that are made in arriving at a closed form solution to the latter. The Uhlig equation is judged to be the least accurate of the three and to be non-conservative. While the closed form solution for the newly developed equation projects a potential attenuation that is non-conservative, the corresponding Anode Current Output is conservative. Based upon this, a protocol for design of galvanic cathodic protection systems upon marine pipelines is proposed.

P Anathakrishnan - One of the best experts on this subject based on the ideXlab platform.

Pietro Pedeferri - One of the best experts on this subject based on the ideXlab platform.

  • effectiveness of a conductive cementitious mortar Anode for cathodic protection of steel in concrete
    Cement and Concrete Research, 2004
    Co-Authors: Luca Bertolini, F Bolzoni, Tommaso Pastore, Pietro Pedeferri
    Abstract:

    The paper reports on the behavior of a cementitious conductive overlay Anode used for cathodic protection (CP) of steel in concrete. The Anode is made of nickel-coated carbon fibers in a cementitious mortar. Tests were carried out on concrete specimens with two layers of rebars that simulated reinforced concrete slabs. Anodic Current densities in the range 10-100 mA/m2 with respect to the Anode surface were imposed. Steel and Anode potentials, as well as feeding voltage, were monitored. Four-hour decay and the distribution of Current and potential were regularly measured. Galvanostatic polarisation tests were also carried out on the Anode material immersed in saturated calcium hydroxide solutions. The maximum Anode Current Output was evaluated. The effectiveness of patch repair of the Anode, on areas damaged by excessive Current Output, is also discussed in the paper.