Patent US3707186A successfully refreshed from Google Patents.
US3707186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling tube ferrule
Assignee: Foster Wheeler Inc
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Filing: 1971-01-18
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Granted: 1972-12-26
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Expires: 1991-01-18
Abstract
Abstract Erosion due to coke in a heat exchanger which cools hot hydrocarbon gas is reduced. A ferrule is mounted on the inlet end of a cooling tube, the ferrule having a flared inlet end to reduce turbulence and having over most of its length an annular space between the ferrule and the tube to prevent the ferrule from becoming cool enough to induce carbon formation.
Inventors
- 👤 Eduardo P Zorrilla
- 👤 William P Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:33
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/002; B; B01; B01D; B01D51/00; B01D51/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
A heat exchanger for cooling a gas containing hot hydrocarbon comprising: a tube sheet; a refractory on one side of said tube sheet; a plurality of holes in said tube sheet; a plurality of holes in said refractory, said refractory holes each being coaxial with one of said holes in said tube sheet and flared outwardly away from said tube sheet; a plurality of tubes, the inlet end of each being positioned within one of said holes, said tubes extending beyond the other side of said tube sheet and through a cooling chamber to the outlet ends of said tubes; a ferrule positioned within the inlet end of each of said tubes, each of said ferrules having a portion at its inlet end which is gradually flared outwardly and which projects beyond the inlet ends of said tubes and beyond said refractory, the outside surface of each of said flared portions engaging flat against the side wall of one of said holes in said refractory, each of said ferrules having an outlet end portion between the other side of said tube sheet and said outlet ends of said tubes, said outlet end portion being of an outside diameter approximately equal to the inside diameter Of said tubes and a central portion connecting said outlet end portion and said flared portion, said central portion having an outside diameter less than the inside diameter of said tube.
Claim 2
Dependent Claim
235 words
A heat exchanger for cooling a gas containing hot hydrocarbon comprising: a tube sheet; a refractory on one side of said tube sheet; a plurality of holes in said tube sheet; a plurality of holes in said refractory, said refractory holes each being coaxial with one of said holes in said tube sheet and flared outwardly away from said tube sheet; a plurality of tubes, the inlet end of each being positioned within one of said holes, said tubes extending beyond the other side of said tube sheet and through a cooling chamber to the outlet ends of said tubes; a ferrule positioned within the inlet end of each of said tubes, each of said ferrules having a portion at its inlet end which is gradually flared outwardly and which projects beyond the inlet ends of said tubes and beyond said refractory, the outside surface of each of said flared portions engaging flat against the side wall of one of said holes in said refractory, each of said ferrules having an outlet end portion between the other side of said tube sheet and said outlet ends of said tubes, said outlet end portion being of an outside diameter approximately equal to the inside diameter Of said tubes and a central portion connecting said outlet end portion and said flared portion, said central portion having an outside diameter less than the inside diameter of said tube.
Claim 3
Dependent Claim
30 words
The heat exchanger defined in claim 1 wherein said flared portions of said ferrules have thicker side walls than said central portions and said outlet end portions of said ferrules.
Claim 4
Dependent Claim
248 words
A ferrule for use in a heat exchanger for cooling a gas containing hot hydrocarbon, said heat exchanger having a tube sheet covered on one side by a refractory with a plurality of holes in said refractory flared outward away from said tube sheet, said holes in said tube sheet being coaxial with a plurality of holes in said tube sheet, a plurality of tubes, the inlet end of each tube being positioned within one of said holes in said tube sheet with each tube extending beyond the other side of said tube sheet and through a cooling chamber to the outlet ends of said tubes, said ferrule comprising a portion of its inlet end which is gradually flared outward and which is adapted to project beyond said one side of said tube sheet and said refractory, the outside surface of each of said flared portions adapted to engage flat against the side walls of one of said holes in said refractory, and each of said ferrules having an outlet end portion of an outside diameter approximately equal to the inside diameter of said tubes and a central portion connecting said outlet end portion and said flared portion, said central portion having an outside diameter less than the inside diameter of said tubes, said ferrule being of sufficient length so that said outlet end portion engages against the inside wall of said tube between said other side of said tube sheet and said outlet ends of said tubes.
Claim 5
Dependent Claim
248 words
A ferrule for use in a heat exchanger for cooling a gas containing hot hydrocarbon, said heat exchanger having a tube sheet covered on one side by a refractory with a plurality of holes in said refractory flared outward away from said tube sheet, said holes in said tube sheet being coaxial with a plurality of holes in said tube sheet, a plurality of tubes, the inlet end of each tube being positioned within one of said holes in said tube sheet with each tube extending beyond the other side of said tube sheet and through a cooling chamber to the outlet ends of said tubes, said ferrule comprising a portion of its inlet end which is gradually flared outward and which is adapted to project beyond said one side of said tube sheet and said refractory, the outside surface of each of said flared portions adapted to engage flat against the side walls of one of said holes in said refractory, and each of said ferrules having an outlet end portion of an outside diameter approximately equal to the inside diameter of said tubes and a central portion connecting said outlet end portion and said flared portion, said central portion having an outside diameter less than the inside diameter of said tubes, said ferrule being of sufficient length so that said outlet end portion engages against the inside wall of said tube between said other side of said tube sheet and said outlet ends of said tubes.
Claim 6
Dependent Claim
32 words
The ferrule defined in claim 3 wherein said flared portion of said ferrule has a relatively thick side wall, and said central portion of said ferrule has a relatively thin side wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |