Method for automatic control of corrosion in a water distribution system
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Jun 25, 1996
filing date -
Jun 25, 1996
priority date (Note) -
Expired
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Abstract
A water distribution system facilitates automatic corrosion control. The operator enters a set of values of parameters associated with water in the system. The system automatically and repeatedly measures the temperature and pH of the water. The system then computes a target pH for the water, according to a function which depends on the temperature and the other parameters, and on an index of corrosion. The system then varies the pH of the water, so as to minimize the deviation between the measured pH and the target pH. The system performs this process repeatedly, to maintain the desired properties of the water. In particular, the operator can easily and automatically control the water so as to make it either more corrosive or more scale-forming, in such a manner as to minimize the dissolution of lead or copper into the water while limiting the tendency of the water to form scale.
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