Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Reexamination Certificate
2011-05-31
2011-05-31
Smith, Duane (Department: 1776)
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
C210S739000, C210S742000, C210S757000, C210S758000, C210S765000, C210S103000, C210S143000, C210S167300, C210S167320, C210S198100, C422S007000
Reexamination Certificate
active
07951298
ABSTRACT:
Disclosed is a method of controlling a real-time oxidation-reduction potential in a hot water system undergoing a wet layup sequence to inhibit corrosion in the hot water system. The method includes separating the wet layup sequence into a plurality of phases. Each phase is either short-term or long-term and a subset of the short-term phases is optionally transitional. The method further includes defining one or more zones in the hot water system. At least one of the defined zones is selected for each phase and one or more of the selected zones include at least one ORP probe operable to measure the real-time ORP and communicate with a controller. The ORP probe(s) either intermittently or continuously measure the real-time ORP at operating temperature and pressure at one or more of the selected zones in one or more of the phases and transmit the measured real-time ORP to the controller. The real-time ORP is assessed to determine whether it conforms to an ORP setting for that phase. The invention further includes a multi-component control device for a hot water system undergoing a wet layup sequence.
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Grattan David A.
Hicks Peter D.
Durand Paul J
Martin Michael B.
Nalco Company
Smith Duane
Yonter Edward O.
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