The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 1998
Filed:
Jul. 10, 1996
Richard S Boswell, Magnolia, TX (US);
Thomas D Farraro, Lake Charles, LA (US);
Citgo Petroleum Corporation, Tulsa, OK (US);
Abstract
A method of manufacturing a delayed coker drum as used in a refining process to receive coke feedstock as a hot liquid and in which the coke feedstock is cooled and quenched to produce solid coke, the hot liquid causing the drum to initially expand circumferentially and laterally and upon quenching to shrink due to thermal contraction, the circumferential shrinking serving to crush solidified coke and the lateral shrinking causing interface frictional contact between the solidified coke and the vessel sidewall that must be overcome, inducing high level stresses in the drum, including the steps of selecting a plurality of metal plates configured for assembling the drum, and welding the plates together creating welded seams and in which the metal plates are selected to have metallurgical characteristics and thicknesses such that their elastic limits exceed the stress introduced in the plates during the quenching process and employing welding materials and techniques such that the elastic limits of the welded seams exceed the stress introduced in the seams as the drum shrinks circumferentially and laterally during quenching operations.