Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Edward F. Stortz0
Dirk B. Varo0
Date of Patent
February 2, 2010
0Patent Application Number
110959150
Date Filed
March 31, 2005
0Patent Primary Examiner
Patent abstract
A method is provided for successfully rolling co-extruded tubing into drums of a boiler bank. First, a co-extruded tube is provided, containing a carbon steel base tubing with an outer layer of high alloy tubing. Next, the outer layer of high alloy tubing is removed by machining in the area of the co-extruded tubing that is to be rolled into the drum. Then, the co-extruded tubing is swaged using multiple swaging steps and annealing treatments. The co-extruded tubing is swaged to the required diameter and wall thickness. Finally, co-extruded tubing is inserted, rolled, and sealed into the drums.
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