Co-extruded generating bank swaged tubing
AssigneeBabcock & Wilcox Canada Ltd.
InventorsDirk Varo, Edward Stortz
Life of this patent
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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.
Claims9
A method for successfully rolling co-extruded tubing into drums of a boiler bank in a corrosion and erosion boiler environment comprising the steps of:
- providing a co-extruded tubing containing a carbon steel base tubing, an outer layer of high alloy tubing, an area that is to be rolled into the drum by machining, and an area that is to be exposed to the boiler environment;
- removing the outer layer of high alloy tubing in the area that is to be rolled into the drum by machining;
- swaging the co-extruded tubing using multiple swaging steps and annealing treatments to swage the co-extruded tubing to a required diameter and wall thickness;
- inserting the co-extruded tubing into the drums;
- rolling the co-extruded tubing;
- and
- sealing the co-extruded tubing into the drums.
A method for successfully rolling co-extruded tubing into drums of a boiler bank comprising the steps of:
- providing a short co-extruded tubing containing a carbon steel base tubing, an outer layer of high alloy tubing, and an area that is to be rolled into the drum by machining;
- removing the outer layer of high alloy tubing in the area that is to be rolled into the drum by machining;
- swaging the short co-extruded tubing using multiple swaging steps and annealing treatments to swage the co-extruded tubing to a required diameter and wall thickness;
- welding the short co-extruded tubing onto a carbon steel generating bank tube that has been cut and prepared to accept the short co-extruded tube after it has been swaged;
- inserting the co-extruded tubing into the drums;
- rolling the co-extruded tubing;
- and
- sealing the co-extruded tubing into the drums.
Dependencies are inferred from the claim text.