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US 12,710,236 B2Granted
Internally profiled tubes
AssigneeParalloy Limited
InventorsDominique Flahaut, Robert Lewis
Life of this patent
Estimating the term…
Abstract
The present invention relates to internally profiled variable pitch tubes or pipes made of steel. The terms tube and pipe are used synonymously in the context of this invention. These tubes are used in the petrochemical industry to crack oil, gas and shale feedstocks into simple hydrocarbons such as ethylene and similar products.
Claims14
A steel tube for use in cracking hydrocarbons at high temperature, wherein the steel tube has a fin formed on the inner wall of the tube, the fin extending continuously in a helical direction across at least a portion of an axial length of the tube, wherein the fin comprises:
- an initial region of constant helical pitch,
- an intermediary region of varying helical pitch that extends for at least three helical rotations of the fin, wherein a pitch of the fin in the intermediary region of varying helical pitch increases from its beginning to its end, and
- a final region of constant helical pitch.
Dependencies are inferred from the claim text.