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AssigneeThe Badger Company, Inc.
InventorsThomas L. Larsen, Max E. Underwood, Maarten P. Noordzij, Shiou-Shan Chen
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The invention provides a method of extending the useful life of high temperature heat exchangers, e.g., reactor feed/effluent heat exchangers, in installations where the heat exchanger is contacted by a process fluid stream, e.g., a feedstock comprising ethylbenzene, at a temperature where the process stream may cause deterioration of contacted metal surfaces of the heat exchanger and/or undergo catalytic reaction as a result of contact with the contacted metal surfaces. The new method comprises the step of mechanically removing material from those surfaces of the heat exchanger that are to be contacted by the process fluid stream, so as to render said surfaces less susceptible to attack from said high temperature process fluid stream.
A method of treating the exterior surfaces of the tubes of a shell and tube heat exchanger which are to be contacted by chemicals that interact therewith, said tubes being made of a nickel-containing stainless steel or a chrome iron alloy with a nickel content greater than that of nickel-containing stainless steels, said method comprising the step of:
A method of treating the exterior surfaces of tubes in a shell and tube heat exchanger so as to reduce interaction of said surfaces with selected chemicals in contact therewith, said tubes being made of a nickel-containing stainless steel alloy or a chrome iron alloy with a nickel content greater than that of nickel-containing stainless steels, said method comprising the step of:
Method of treating the external surfaces of the tubes of a shell and tube heat exchanger that are to be contacted by a vapor phase material flowing through the shell side of said heat exchanger, said tubes being made of a nickel-containing stainless steel or a chrome iron alloy with a nickel-containing content greater than that of nickel-containing stainless steels, said vapor phase material being known to have a tendency to interact with said exterior surfaces, said method of treatment comprising the step of:
Dependencies are inferred from the claim text.