
110 Control for Aluminum Production
In general, it is found that a pot at risk list of greater than ve in one pot-
room is near the maximum that can be handled without tapouts and/or
loss of a number of pots in a week, causing an inability to reconstruct
them and loss of pot production days.
Using this method, it is possible to operate smelters with multiple
potlines with zero tapouts for a number of years (e.g., Boyne Smelters in
Queensland, Australia, in 2001/2002). The consequent reduction in oper-
ating costs is in the range $0.5 to $1 million per year, in the case where
the power contract is not take or pay. If the power contract is take ...