LIFE ESTIMATION OF TRANSFER LINES FOR TANK FARM CLOSURE PERFORMANCE ASSESSMENT

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A performance assessment is being performed in support of closure of the F-Tank Farm. The performance assessment includes the life estimation of the transfer lines that are used to transport waste between tanks both within a facility (''intra-area'' transfer) and to other facilities (''inter-area'' transfers). The transfer line materials of construction will initially provide a barrier to contaminant escape. However, the materials will degrade over time, most likely due to corrosion, and will no longer provide a barrier to contaminant escape. The life estimation considered the corrosion of the core pipe under exposure to soil, estimated the thickness loss due ... continued below

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Subramanian, K October 1, 2007.

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A performance assessment is being performed in support of closure of the F-Tank Farm. The performance assessment includes the life estimation of the transfer lines that are used to transport waste between tanks both within a facility (''intra-area'' transfer) and to other facilities (''inter-area'' transfers). The transfer line materials of construction will initially provide a barrier to contaminant escape. However, the materials will degrade over time, most likely due to corrosion, and will no longer provide a barrier to contaminant escape. The life estimation considered the corrosion of the core pipe under exposure to soil, estimated the thickness loss due to general corrosion, and the percentage of wall area breached due to localized corrosion mechanisms. There are three types of transfer lines that are to be addressed within the performance assessment: Type I, Type II/IIA and Type III. The life of the transfer lines were estimated as exposed to soil. Localized and general corrosion of the transfer lines exposed to soil was estimated to provide input to the fate and transport modeling of the performance assessment. Pitting corrosion was found to be the controlling mechanism for the degradation of the transfer lines and their consequent ability to maintain confinement of contaminants. It is assumed that 75% of the transfer line is needed intact to provide this confinement function, i.e. once 25% of the line wall is breached, the lines are considered incapable of confining contaminants. It is recommended that the percentage breached curves be utilized for each transfer line as shown in Figure 1 for the various stainless steel transfer lines.

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  • Report No.: WSRC-STI-2007-00460
  • Grant Number: DE-AC09-96SR18500
  • DOI: 10.2172/920660 | External Link
  • Office of Scientific & Technical Information Report Number: 920660
  • Archival Resource Key: ark:/67531/metadc895548

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 2, 2016, 12:56 p.m.

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Subramanian, K. LIFE ESTIMATION OF TRANSFER LINES FOR TANK FARM CLOSURE PERFORMANCE ASSESSMENT, report, October 1, 2007; [Aiken, South Carolina]. (digital.library.unt.edu/ark:/67531/metadc895548/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.