US1831708A - Return bend - Google Patents

Description

Nov. 10, 1931. J. E. GETZEN ET AL 1,831,708

RETURN BEND Filed Oct. 50, 1930 2 Sheets-Sheet l 6%???0/7 B. (ran e mm 5. 68236 C/arexrce ll. Den M INVENTORS A ORNEY Nov. 10, 1931. J. E. GETZEN ET AL 1,831,708

RETURN BEND Filed Oct. 50, 1930 2 Sheets-Sheet 2 Morfofl 5. (rows John [4 6e) 2 (/arexzce b. e/I/Me INVENTORS BY/zwwz ATTORNEY Patented Nov. 10, 1931 UNITED STATES PATENT OFFICE JOHN E. GETZEN AND CLARENCE H. DENICKE, OF BIRMINGHAM, ALABAMA, AND

MORTON B. CROWE, OF TULSA, OKLAHOMA, ASSIGNORS TO STOCKHAM PIPE & FIT- TINGS CO. INC., OF BIRMINGHAM, ALABAMA, A CORPORATION OF ALABAMA RETURN BEND Application filed October 30, 1930. Serial No. 492,210.

Our invention relates to return bends which are used in connection with cracking stills, and more particularly to those used in the newer processes, in which the pressure is not so great but in which the temperature is extremely high.

In the operation of such stills, a very considerable amount of free carbon is deposited on the interior of the tubes, which necessitates their frequent cleaning, and as the tubes are expensive, it is highly desirable to have a return bend which can be readily detached, so that the tubes can be cleaned, or replaced when necessary, without injury to either the tubes or the return bend by the removal thereof.

Many of the devicesnow in use are so con structed that the effect, of the combined action of the heat and the coking of the free carbon deposited on the interior walls of the tubes and bend, is such that it is frequently necessary to cut off, not only the tube which is to be removed, but its adjoining tube as well, because it is impossible to remove the return bend from the tubes Without doing this; and this operation results in the loss of both tubes, and frequently includes also the loss of the bend.

Our invention has for its object, to provide a comparatively inexpensive form of return bend, in which we provide astream-line flow for the oil, and in which the bend is easily removable, for the purpose of cleaning or replacing the tubes, without injury to either the tubes or the bend.

A concrete device embodying our invention is illustrated in the accompanying drawings, which are to be considered as a part of this specification, in which Fig. 1 is a side elevation, partly in section, of our improved return bend Fig. 2 is a top or plan view of the same;

Fig. 3 is an end elevation: and

Fig. 4 is a cross-section, taken on line 4-4 in Fig. 2, in the direction indicated by the arrows.

Similar reference numerals refer to similar parts throughout the entire description.

In the drawings we show only fragmentary portions of tubes 1 and 2, as obviously these are no part of our invention, and in the following description we shall confine ourselves to the structure with relation to tube 2, it being understood that the construction for tub-e 1 is identical.

Tubes 1 and 2 are provided with shoulders 0 adjacent their ends, their ends 18 having convex surfaces, as clearly seen in the sectional view in Fig. 4. A yoke l, having openings 5 and 6 therein, through which tubes 1 and 2 pass, is provided with sectional metal bushings 7, theouter wall of which is provided with a shoulder 8, adapted to engage shoulders 9 formed on the interior of the openings 5 and 6. The inner wall of the metal bushings 7 is fitted to the exterior wall of the pipes or tubes 1 and 2.

The yoke 4 comprises two flanges 10, in which the openings 5 and 6 are formed. These flanges 10 are connected by a web 12. Bolt holes 13 are formed in the flanges 10, and are adapted to receive bolts 14, which are mounted in holes 15 formed in flanges 16, which are cast or formed on a return bend 17. The return bend 17 is formed with an unobstructed interior passage, the diameter of which corresponds to the internal diameter of the tubes 1 and 2, so that provision is made for free flow of oil through the tubes 1 and 2 and the return bend 17.

As illustrated, we show convex surfaces 18 formed on the ends of tubes 1 and 2, and tapered grooves 19 formed in the face of the return bend 17, adapted to register with the ends 18 of the tubes 1 and 2.

It will be obvious that by tightening the nuts 11 on the bolts 14, the flanges 16 on the return bend 17 will be drawn tightly against the flanges 10 on the yoke 4. This draws the sectional metal bushings 7 against the upset or shouldered portions 3 of the tubes 1 and 2, and thus draws the ends 18 of tubes 1 and 2 tightly into the grooves 19, which serves to make a tight joint.

Although we have shown and described a particular type of joint for this purpose, it will be obvious that our invention is not confined to any specific joint, but that any desired type of joint may be utilized.

To remove tile return bend 17, obviously all that is necessary is to remove the nuts 11 from the bolts 14, when a slight blow of a hammer on the return bend 17 will dislodge it, so that it can be removed without in any way injuring it, and also without injury to the ends 3 of the tubes 1 and 2.

Up to this. point we have illustrated and described a concrete embodiment of our invention. We wish it understood, however, that this is merely for the purpose of presenting a preferred form of construction, as many changes in the construction may suggest themselves to persons skilled in the art, and We do'not therefore desire to be limited to the precise construction illustrated, except as such limitations may appear in the hereinafter appended claim.

Having described our invention, What We regard as new, and desire to obtain by Letters Patent of the United States, is:

In refinery apparatus, means for connecting a return bend to a pair of pipes having shouldered ends comprising an outwardly projecting flange on said return bend, a plate having shouldered apertures of a size to pass over said shouldered ends, sectional locking rings adapted tobeinterposed between the shoulders of saidends and said plate to lock the same together, and means for securing said flange and said plate together.

JOHN E. GETZEN. CLARENCE H. DENICKE. MORTON B. CROWE.

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