A STRUCTURAL INTEGRITY EVALUATION OF THE TANK FARM WASTE TRANSFER SYSTEM Page: 62 of 86
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WSRC-TR-2005-00532 March, 2006
Page 55 of 69
transfers during their lifetime. However, the transfer line that travel from HDB-7 to Tank
51, will experience all the transfers that occur during bulk sludge removal operations.
Therefore, these lines will be utilized as a bounding case for sludge slurry transfer during
bulk waste removal. The line from HDB-7 to Tank 51 is composed of three segments:
#3060, #16052, and #16011.
Input: Bulk sludge removal from Tank 11 was recently completed [108]. During the past
year, 5 transfers were performed each lasting approximately 48 hours. Therefore, these
transfer lines were exposed to 10 days of a flowing environment over the past year. The
annual usage factor for erosion is 10/365 or 0.027, while for general corrosion the annual
usage factor is 0.973.
Assumption: It will be assumed that Tank 51 will receive a sludge batch every year.
Assumption: The calculation assumes that sludge transfers continue on until the
minimum required wall thickness is achieved. Schedules indicate however that sludge
removal operations are expected to be complete within the next 30 years. This
assumption will allow us to assess the margin on wall thickness given the projected
schedule.
The annual usage factor for erosion of the lines in this transfer path is therefore 0.027,
while for general corrosion the annual usage factor is 0.973.
b) Sludge slurry transfer from Tank 40 to the low point pump pit.
Input: The transfer path from Tank 40 to the low point pump pit includes line segments:
#16312, #16104, and #SDP2.
Input: Transfers occur approximately once every eight days. This converts to 46
transfers per year.
Input: Each transfer is approximately 7000 gallons.
Input: The flow rate is approximately 100 gallons per minute.
Assumption: The calculation assumes that sludge transfers continue on until the
minimum required wall thickness is achieved. Schedules indicate however that sludge
removal operations are expected to be complete within the next 30 years. This
assumption will allow us to assess the margin on wall thickness given the projected
schedule.
Given the volume per transfer and the flow rate, each transfer will last approximately 70
minutes. Thus, the lines in this transfer path will be exposed to continuous flow for
approximately 3220 minutes or 2.23 days per year. The annual usage factor for erosion
of the lines in this transfer path is therefore 0.006, while for general corrosion the annual
usage factor is 0.994.
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Wiersma, B. A STRUCTURAL INTEGRITY EVALUATION OF THE TANK FARM WASTE TRANSFER SYSTEM, report, March 9, 2006; United States. (https://digital.library.unt.edu/ark:/67531/metadc836317/m1/62/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.