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Ring bus 511,000 59.0
Riser 56,400 59.0
Ore bin 53,000 654.0
Superstructure 535,100 654.0
Alumina feeder 53,500 732.0
Total $99,666
1 In addition to this cost for installing a replacement cell
lining, Vanalco paid approximately $5,401 per failed cell to tear
out the exhausted lining plus some miscellaneous costs.
2 Substantial repairs have been made to the cell cradles
since
they were placed in service.
3 The end sections of each shell have been in service for
approximately 59 years and have been repaired. Many of the
center sections have been replaced within the last 10 years.
4 The carbon anodes have a useful life of 14 days. The
expense of this component is not at issue.
5 These components were not replaced during the years at
issue. The dollar amounts reflect the 1998 replacement costs.
6 Vanalco extended the length of the ore bins and the
superstructures by approximately 3 feet. Except for the
extensions, the ore bins and superstructures have been in service
for approximately 54 years.
7 Approximately 30 percent of the alumina feeder must be
replaced every 3 or 4 years. The remaining portion has been in
service for approximately 32 years.
Vanalco reported a repair expense of $4,411,245 for the cost
of replacing the linings of 206 cells in 1992 and $4,224,991 for
the cost of replacing the linings of 192 cells in 1993.
The Cell Room Floors
Vanalco has 10 cell rooms,5 which are each approximately 722
feet in length and 47 feet in width. Each cell room is divided
lengthwise into three sections--a center section with the cells,
a section to one side called the "tap end", and a narrower
5The cell rooms are numbered 4, 6, 8, 10, 12, 14, 16, 18,
20, and 22.
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Last modified: May 25, 2011