US20030111510A1 - Concentric, insulated tubular conduits and method for assembly - Google Patents
Concentric, insulated tubular conduits and method for assembly Download PDFInfo
- Publication number
- US20030111510A1 US20030111510A1 US10/357,611 US35761103A US2003111510A1 US 20030111510 A1 US20030111510 A1 US 20030111510A1 US 35761103 A US35761103 A US 35761103A US 2003111510 A1 US2003111510 A1 US 2003111510A1
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- US
- United States
- Prior art keywords
- tube
- assembly
- larger
- lifting device
- centralizers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/154—Making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S414/00—Material or article handling
- Y10S414/123—Hollow cylinder handlers
Definitions
- the present invention relates to methods for fabricating insulated, concentric tubular bodies and the bodies fabricated by such methods.
- Insulated tubulars or pipe of this type are sometimes referred to as “pipe-in-pipe” or “tube-in-tube” fluid conduits.
- Insulated, concentric tubular fluid conduits are employed in well completions, pipelines, refineries, and other processing installations.
- the tube-in-tube insulated pipe employed in oil and gas wells is typically joined together end-to-end by threaded connections.
- the threads must be formed on the tubing after the concentric pipe bodies have been assembled.
- the typical insulated section employs a threaded external tube surrounding a shorter, smaller diameter tube that is welded into the larger tube.
- the assembly may also be heat treated after the inner tube is installed.
- the threads are preferably formed on the outer tube after the inner tube is installed and the assembly is heat treated.
- Threading speeds 150 rpm or more are common. Relative movement between the inner and outer pipe bodies as the assembly is rotated can cause harsh vibration and other undesired mechanical movement that interferes with the threading process.
- the relative radial position of the inner and outer tubes can be fixed by employing multiple rigid spacers in the annulus between the two tubes.
- One commonly employed technique is to provide a hinged metal stamping with raised ears to close the gap between the inner and outer tubes. Because of the use of sheet stock as the spacer material, the contacting ears form a flat surface engaging the inside surface of the surrounding tube.
- Another technique employed to fix the inner and outer tubes is to employ a square stock that has been cut to short lengths and welded onto the outside surface of the inner pipe. Because the spacer is cut from square stock, the contact ends form a flat surface contacting the inside surface of the inner pipe.
- the shape, size, and distribution of the centralizers also affect the assembly process of inserting the inner tube into the outer tube.
- Multilayer wrappings of insulating material are often disposed over the smaller diameter tube between the axially spaced centralizers. It is typical to insert the inner tube, equipped with centralizers and insulation material, into the larger tube while the inner and outer tubes are horizontally oriented. As this is done, the inner tube slides along the internal bottom wall of the outer tube. This sliding movement can damage the centralizers and the insulation material. Horizontal insertion may also be made difficult when the internal surface of the outer tubular body is coarse or irregular such that the centralizers and insulation are abraded or hang up on the surface irregularities.
- the desired spacing could be achieved by welding temporary lugs or retaining members to the inner or outer pipe at appropriate locations to form a stop that would fix the inner pipe lengthwise within the outer pipe. Such a procedure would require an additional welding step and also introduces an additional point for the introduction of measurement errors.
- Centralizing rings having specially configured contact surfaces are affixed to the external surface of the inner tube forming the concentric insulated tubular assembly.
- the centralizers are provided with a curving cross-section along their radially outermost contact surface to make circumferential line contact with the internal surface of the overlying tubular body to minimize heat transfer between the tubes.
- Recesses are formed circumferentially about the external diameter of the centralizing rings to minimize the total contact area between the rings and the surrounding tubing.
- the centralizing rings are disposed circumferentially about the inner tube such that the recesses in adjacent centralizing rings are offset circumferentially to preclude axially extending, aligned contact surfaces that enhance heat transfer.
- the centralizing rings provide a minimum amount of surface contact with the overlying tube while rigidly occupying the annular space formed between the inner and outer tubular bodies to prevent any relative radial displacement between the bodies.
- the firm line contact engagement provided by the centralizing rings minimizes the heat transfer between the inner and outer tubes and also permits the concentric tubular assembly to be rotated at high speeds during the threading process without experiencing excessive vibration or other undesired mechanical movement.
- the damage normally occurring when insulating tubes are assembled horizontally is avoided with the use of a lifting device of the present invention that permits the inner and outer tubes to be assembled vertically in a recessed assembly well.
- the lifting device permits the inner tube to be raised vertically and aligned concentrically with the vertically disposed outer tube.
- the lifting device employed to lower the centralizer-equipped, insulation-wrapped inner tube vertically into the outer tube automatically centers the inner tube within the surrounding outer tube. Spring-loaded legs carried by the lifting device automatically spring radially outwardly once they clear the bottom of the larger diameter tubing.
- An upward pull exerted on the lifting device brings detents in the legs against the base of the outer tube so that the outer tube is supported by the lifting device and the inner and outer tubes are precisely positioned axially.
- the combined assembly may then be raised vertically from the assembly well and returned to horizontal position for subsequent working.
- an important object of the present invention is to provide a method and apparatus for assembling concentric tubular bodies whereby the bodies are rigidly affixed radially relative to each other to prevent vibration or other undesired motion as the bodies are rotated during the threading of the ends of the tubular bodies.
- Yet another object of the present invention is to provide a centralizer ring that can be positioned in the annular space between concentric tubulars to securely fix the tubulars radially relative to each other while minimizing the amount of heat transfer between the tubulars.
- Another object of the present invention is to provide a centralizing ring disposed in the annulus between two concentric tubular bodies wherein the centralizing ring forms an interrupted line contact with the surrounding tubular body to minimize the heat transfer between the two tubular bodies.
- a related object of the present invention is to provide a curving surface on the external circumferential area of a centralizing ring whereby the ring forms a line contact with the inner surface of a surrounding tubular body.
- An important object of the present invention is to provide a centralizing ring that may be employed in the vertical assembly of concentric tubular components whereby the radially outer surface of such centralizing ring engages the internal surface of the surrounding tubular and is configured to freely advance axially along such surface.
- An important object of the present invention is to provide a lifting device that permits a tubular body equipped with annular centralizing rings to be lifted from a horizontal orientation, vertically oriented in a position coaxially with a larger tubular within which is to be received, lowered centrally through the larger tubular, and positioned axially at the correct axial location relative to the surrounding tubular.
- a related object of the present invention is to provide an annular shoulder and radial end surfaces on the lifting device whereby the lower end of the smaller tubular rests on the annular shoulder while the radial end surfaces centralize the smaller tubular as it is lowered through the larger tubular.
- An object of the present invention is to provide a lifting device that can support an outer tubular body and an inner-tubular body and automatically position the two bodies axially relative to each other while the bodies are vertically oriented.
- FIG. 1 is a vertical elevation schematically illustrating the initial horizontal disposition of the individual tubular components of the insulated tubing of the present invention in the work area;
- FIG. 2 is a vertical elevation schematically illustrating the repositioning of the larger tubular body from horizontal to vertical orientation in the assembly of the insulated tubing of the present invention
- FIG. 3 is a vertical elevation schematically illustrating the vertical alignment of the larger and smaller tubing components of the assembly just prior to inserting the smaller tubular body into the larger tubular body;
- FIG. 4 is a vertical elevation schematically illustrating the two tubular bodies concentrically disposed in an assembly recess
- FIG. 5 is a vertical elevation schematically illustrating the assembled insulated tubing bodies removed from the assembly recess and repositioned horizontally in the work area;
- FIG. 6 is a vertical elevation, partially in section, illustrating a lifting device of the present invention
- FIG. 7 is a vertical elevation, partially in section, illustrating a lifting device of the present invention engaging the bases of concentric inner and outer tubular bodies as the assembled bodies are being lifted from the assembly recess;
- FIG. 8 is a plan view of a centralizing ring of the present invention.
- FIG. 9 is an elevation taken along the line 9 - 9 of FIG. 8 illustrating an annular centralizer of the present invention
- FIG. 10 is a vertical cross-section taken along the line 10 - 10 of FIG. 8 illustrating details in the configuration of the centralizing ring of the present invention.
- FIG. 11 is a vertical cross-section illustrating a completed insulated tubing assembly of the present invention.
- FIG. 1 illustrates an assembly procedure employed in manufacturing the insulated tubing of the present invention.
- the process requires that an insulated tubular body 11 be inserted into a longer, larger diameter tubular body 12 to form a double-wall, concentric composite body.
- It is conventional in prior art processes to assemble the insulated tubing by inserting the smaller tube into the larger tube while both tubes are reclining horizontally as illustrated in FIG. 1.
- This procedure can damage the centralizing rings and insulating material carried around the external body of the inner tube.
- Interior surface projections and coarse finishes on the internal wall of the outer tube may also hang up with the centralizing rings and insulation material to prevent the inner tube from being freely received within the larger surrounding tube.
- the larger tubular body 12 is first elevated from its horizontal position in the work area and aligned vertically over a recessed assembly well 13 .
- the work area may comprise a shop floor or an elevated table surface upon which the tubular bodies are initially positioned prior to being assembled.
- a vertical hoist mechanism 14 is employed for lifting the tubular body 12 from its horizontal position in the work area into vertical alignment with the assembly well 13 .
- the tube 12 is lifted by first securing a suitable clamp 15 about the external surface of the outer body 12 .
- the clamp 15 is attached to a lift line 16 connecting with the hoisting mechanism 14 .
- the vertically oriented tube 12 is lowered into the assembly well 13 and anchored in place in a chuck 13 a or other suitable device to support the tube 12 vertically above the bottom 17 of the assembly well.
- the inner tube 11 which has been previously equipped with centralizers and insulating material, as will hereinafter be described, is then lifted with a hoisting mechanism 18 from its horizontal position in the work area into a vertically aligned position above the tube 12 as illustrated in FIG. 3.
- a line 19 from the hoist 18 is threaded through the tube 11 and secured to a lifting device 20 , as will hereinafter be more fully described.
- the lifting device 20 engages the base of the tube to hold the tube in place on the hoist line 19 .
- the lifting device 20 carries spring-loaded legs 21 and 22 that are manually retracted before the lifting device engages the top of the tube 12 , allowing the lifting device to be received within the larger tube as the smaller tube 11 is lowered vertically.
- the line 19 from the hoist 18 is reeled out until the spring-loaded legs 21 and 22 at the bottom of the tube 11 have been lowered sufficiently to clear the bottom of the tube 12 .
- the legs 21 and 22 spring radially outwardly, as illustrated in FIG. 4.
- FIG. 7 illustrates the lifting device 20 secured to the bottom of the inner tube 11 and the outer tube 12 in preparation for extracting the assembly from the assembly well.
- the axial end or base of the tube 12 is seen to be supported by a lift surface in the form of detents 38 and 39 , providing support for the outer tube 12 .
- the lift plate 28 is illustrated supporting the base of the inner tube 11 on the annular lip 29 .
- the circumferential end surface 30 provides a centralizing radially outer surface dimensioned to closely engage the internal wall of the surrounding tube 12 to ensure centralization of the tube 11 .
- the insulated tube of the present invention includes annular centralizing rings 40 that are secured along the external surface of the tube 11 to maintain proper spacing between the inner and outer tubes.
- Alternating projections 41 and radially recessed areas 42 formed along the external surface of the centralizing ring 40 provide structural support with a minimum amount of surface contact to minimize heat transfer while maintaining adequate structural support between the two tubes.
- a gap 43 is provided in the centralizing ring to assist in positioning the ring about the inner tube 11 .
- the ring 40 is provided with a curving external surface contour on the projections 41 to provide a line contact between the centralizing ring and the internal surface of the surrounding tube 12 .
- a design clearance of approximately 0.030 inch is provided between the outside diameter of the centralizing ring and the internal diameter of the surrounding tube 12 .
- the centralizing rings and insulating material are applied to the inner tube 11 while the tube is horizontally oriented in the work area, as illustrated in FIG. 1.
- the centralizing rings are positioned at axially spaced locations along the length of the tube 11 and are welded to the tube 11 at the desired axial positions. In one embodiment of the invention, three such centralizing rings are disposed intermediate the ends of the tube 11 .
- the tube 11 is provided with annular upsets or radial projections 50 at each tube end to function as centralizers for the tube 11 .
- the upsets 50 may also be provided by welding an annular ring or other suitable body to the end of the tube and machining the body down to the desired dimension.
- Insulating material 51 is wrapped around the tube 11 between the centralizing rings 40 and the upsets 50 to a diameter slightly less than the outside diameter of the upsets and centralizing rings.
- the insulation in one embodiment is formed by wrapping alternating layers of aluminum foil and fiber cloth mesh. Getter material may also be included in the composition of the material applied to the external surface of the tube 11 .
- the tube 11 is precisely positioned at the desired location within the tube 12 by the operation of the lifting device 20 .
- the axial spacing between the detents 38 and 39 and the top of the lip 29 precisely limits the axial position of the inner tube 11 relative to the outer tube 12 .
- the illustrated axial position is the desired final welding position for the two tubes.
Abstract
Description
- This application is a divisional of U.S. patent application Ser. No. 09/912,053 filed Jul. 23, 2001 which is a divisional of U.S. patent application Ser. No. 09/481,619 filed Jan. 12, 2000 now U.S. Pat. No. 6,325,278 B1.
- 1. Field of the Invention
- The present invention relates to methods for fabricating insulated, concentric tubular bodies and the bodies fabricated by such methods. Insulated tubulars or pipe of this type are sometimes referred to as “pipe-in-pipe” or “tube-in-tube” fluid conduits. Insulated, concentric tubular fluid conduits are employed in well completions, pipelines, refineries, and other processing installations.
- 2. Prior Art Setting of the Invention
- The tube-in-tube insulated pipe employed in oil and gas wells is typically joined together end-to-end by threaded connections. In the case of some of the designs employed in oil and gas wells, the threads must be formed on the tubing after the concentric pipe bodies have been assembled. The typical insulated section employs a threaded external tube surrounding a shorter, smaller diameter tube that is welded into the larger tube. The assembly may also be heat treated after the inner tube is installed. The threads are preferably formed on the outer tube after the inner tube is installed and the assembly is heat treated.
- Conventional threading operations require that the pipe be rotated as threads are being cut into the end of the pipe. Threading speeds of 150 rpm or more are common. Relative movement between the inner and outer pipe bodies as the assembly is rotated can cause harsh vibration and other undesired mechanical movement that interferes with the threading process.
- The relative radial position of the inner and outer tubes can be fixed by employing multiple rigid spacers in the annulus between the two tubes. One commonly employed technique is to provide a hinged metal stamping with raised ears to close the gap between the inner and outer tubes. Because of the use of sheet stock as the spacer material, the contacting ears form a flat surface engaging the inside surface of the surrounding tube.
- Another technique employed to fix the inner and outer tubes is to employ a square stock that has been cut to short lengths and welded onto the outside surface of the inner pipe. Because the spacer is cut from square stock, the contact ends form a flat surface contacting the inside surface of the inner pipe.
- In both of the described prior art spacing techniques, the design and volume of these spacers can significantly increase the heat transfer between the inner and outer conductors. Benefits of a more stable assembly for threading purposes are offset by the increases in heat transfer between the tubes.
- The shape, size, and distribution of the centralizers also affect the assembly process of inserting the inner tube into the outer tube. Multilayer wrappings of insulating material are often disposed over the smaller diameter tube between the axially spaced centralizers. It is typical to insert the inner tube, equipped with centralizers and insulation material, into the larger tube while the inner and outer tubes are horizontally oriented. As this is done, the inner tube slides along the internal bottom wall of the outer tube. This sliding movement can damage the centralizers and the insulation material. Horizontal insertion may also be made difficult when the internal surface of the outer tubular body is coarse or irregular such that the centralizers and insulation are abraded or hang up on the surface irregularities.
- Many of the problems associated with horizontal assembly of the inner and outer tubes may be avoided by orienting the two tubes vertically while the inner tube is inserted. While the vertical orientation technique can eliminate the described problems associated with dragging the inner tube along the internal bottom wall of the outer tube, vertical orientation introduces other assembly problems. In this regard, the relative axial position of the inner and outer tubular bodies must be closely controlled such that the mid-length of each conduit is coincident. Additionally, the inner tubular body is usually shorter than the surrounding outer body so that the lengthwise centering must be accomplished within the surrounding pipe.
- The desired spacing could be achieved by welding temporary lugs or retaining members to the inner or outer pipe at appropriate locations to form a stop that would fix the inner pipe lengthwise within the outer pipe. Such a procedure would require an additional welding step and also introduces an additional point for the introduction of measurement errors.
- Centralizing rings having specially configured contact surfaces are affixed to the external surface of the inner tube forming the concentric insulated tubular assembly. The centralizers are provided with a curving cross-section along their radially outermost contact surface to make circumferential line contact with the internal surface of the overlying tubular body to minimize heat transfer between the tubes.
- Recesses are formed circumferentially about the external diameter of the centralizing rings to minimize the total contact area between the rings and the surrounding tubing. The centralizing rings are disposed circumferentially about the inner tube such that the recesses in adjacent centralizing rings are offset circumferentially to preclude axially extending, aligned contact surfaces that enhance heat transfer.
- The centralizing rings provide a minimum amount of surface contact with the overlying tube while rigidly occupying the annular space formed between the inner and outer tubular bodies to prevent any relative radial displacement between the bodies. The firm line contact engagement provided by the centralizing rings minimizes the heat transfer between the inner and outer tubes and also permits the concentric tubular assembly to be rotated at high speeds during the threading process without experiencing excessive vibration or other undesired mechanical movement.
- The damage normally occurring when insulating tubes are assembled horizontally is avoided with the use of a lifting device of the present invention that permits the inner and outer tubes to be assembled vertically in a recessed assembly well. The lifting device permits the inner tube to be raised vertically and aligned concentrically with the vertically disposed outer tube. The lifting device employed to lower the centralizer-equipped, insulation-wrapped inner tube vertically into the outer tube automatically centers the inner tube within the surrounding outer tube. Spring-loaded legs carried by the lifting device automatically spring radially outwardly once they clear the bottom of the larger diameter tubing. An upward pull exerted on the lifting device brings detents in the legs against the base of the outer tube so that the outer tube is supported by the lifting device and the inner and outer tubes are precisely positioned axially. The combined assembly may then be raised vertically from the assembly well and returned to horizontal position for subsequent working.
- From the foregoing, it will be appreciated that an important object of the present invention is to provide a method and apparatus for assembling concentric tubular bodies whereby the bodies are rigidly affixed radially relative to each other to prevent vibration or other undesired motion as the bodies are rotated during the threading of the ends of the tubular bodies.
- Yet another object of the present invention is to provide a centralizer ring that can be positioned in the annular space between concentric tubulars to securely fix the tubulars radially relative to each other while minimizing the amount of heat transfer between the tubulars.
- Another object of the present invention is to provide a centralizing ring disposed in the annulus between two concentric tubular bodies wherein the centralizing ring forms an interrupted line contact with the surrounding tubular body to minimize the heat transfer between the two tubular bodies.
- A related object of the present invention is to provide a curving surface on the external circumferential area of a centralizing ring whereby the ring forms a line contact with the inner surface of a surrounding tubular body.
- An important object of the present invention is to provide a centralizing ring that may be employed in the vertical assembly of concentric tubular components whereby the radially outer surface of such centralizing ring engages the internal surface of the surrounding tubular and is configured to freely advance axially along such surface.
- An important object of the present invention is to provide a lifting device that permits a tubular body equipped with annular centralizing rings to be lifted from a horizontal orientation, vertically oriented in a position coaxially with a larger tubular within which is to be received, lowered centrally through the larger tubular, and positioned axially at the correct axial location relative to the surrounding tubular. A related object of the present invention is to provide an annular shoulder and radial end surfaces on the lifting device whereby the lower end of the smaller tubular rests on the annular shoulder while the radial end surfaces centralize the smaller tubular as it is lowered through the larger tubular.
- An object of the present invention is to provide a lifting device that can support an outer tubular body and an inner-tubular body and automatically position the two bodies axially relative to each other while the bodies are vertically oriented.
- An object of the present invention is to provide a single assembly device for lowering a vertically oriented tubular through a larger surrounding tubular and subsequently raising both tubulars with a single lifting movement of the assembly device.
- The foregoing, as well as other, objects, features, and advantages of the present invention will become more readily apparent and better understood from the following drawings, specification, and claims.
- FIG. 1 is a vertical elevation schematically illustrating the initial horizontal disposition of the individual tubular components of the insulated tubing of the present invention in the work area;
- FIG. 2 is a vertical elevation schematically illustrating the repositioning of the larger tubular body from horizontal to vertical orientation in the assembly of the insulated tubing of the present invention;
- FIG. 3 is a vertical elevation schematically illustrating the vertical alignment of the larger and smaller tubing components of the assembly just prior to inserting the smaller tubular body into the larger tubular body;
- FIG. 4 is a vertical elevation schematically illustrating the two tubular bodies concentrically disposed in an assembly recess;
- FIG. 5 is a vertical elevation schematically illustrating the assembled insulated tubing bodies removed from the assembly recess and repositioned horizontally in the work area;
- FIG. 6 is a vertical elevation, partially in section, illustrating a lifting device of the present invention;
- FIG. 7 is a vertical elevation, partially in section, illustrating a lifting device of the present invention engaging the bases of concentric inner and outer tubular bodies as the assembled bodies are being lifted from the assembly recess;
- FIG. 8 is a plan view of a centralizing ring of the present invention;
- FIG. 9 is an elevation taken along the line9-9 of FIG. 8 illustrating an annular centralizer of the present invention;
- FIG. 10 is a vertical cross-section taken along the line10-10 of FIG. 8 illustrating details in the configuration of the centralizing ring of the present invention; and
- FIG. 11 is a vertical cross-section illustrating a completed insulated tubing assembly of the present invention.
- FIG. 1 illustrates an assembly procedure employed in manufacturing the insulated tubing of the present invention. The process requires that an insulated
tubular body 11 be inserted into a longer, larger diametertubular body 12 to form a double-wall, concentric composite body. It is conventional in prior art processes to assemble the insulated tubing by inserting the smaller tube into the larger tube while both tubes are reclining horizontally as illustrated in FIG. 1. This procedure can damage the centralizing rings and insulating material carried around the external body of the inner tube. Interior surface projections and coarse finishes on the internal wall of the outer tube may also hang up with the centralizing rings and insulation material to prevent the inner tube from being freely received within the larger surrounding tube. - In practicing the assembly process of the present invention, the larger
tubular body 12 is first elevated from its horizontal position in the work area and aligned vertically over a recessed assembly well 13. The work area may comprise a shop floor or an elevated table surface upon which the tubular bodies are initially positioned prior to being assembled. - A vertical hoist
mechanism 14 is employed for lifting thetubular body 12 from its horizontal position in the work area into vertical alignment with the assembly well 13. Thetube 12 is lifted by first securing asuitable clamp 15 about the external surface of theouter body 12. Theclamp 15 is attached to alift line 16 connecting with thehoisting mechanism 14. The vertically orientedtube 12 is lowered into the assembly well 13 and anchored in place in achuck 13 a or other suitable device to support thetube 12 vertically above the bottom 17 of the assembly well. - The
inner tube 11, which has been previously equipped with centralizers and insulating material, as will hereinafter be described, is then lifted with ahoisting mechanism 18 from its horizontal position in the work area into a vertically aligned position above thetube 12 as illustrated in FIG. 3. In preparation for this hoisting procedure, aline 19 from the hoist 18 is threaded through thetube 11 and secured to alifting device 20, as will hereinafter be more fully described. As thetube 11 is moved into a vertical position, the liftingdevice 20 engages the base of the tube to hold the tube in place on the hoistline 19. - The
lifting device 20 carries spring-loadedlegs tube 12, allowing the lifting device to be received within the larger tube as thesmaller tube 11 is lowered vertically. Theline 19 from the hoist 18 is reeled out until the spring-loadedlegs tube 11 have been lowered sufficiently to clear the bottom of thetube 12. Once clear of the bottom of thetube 12, thelegs - Subsequent reeling in of the
line 19 draws theextended legs tube 12 so that the lifting force of the hoist is transferred to the base of thetube 12. Continued retraction of theline 19 extracts the combined assembly ofinner tube 11 andouter tube 12 from the assembly well 13. The concentric tubular assembly may then be returned to its horizontal position in the work area, as illustrated in FIG. 5. - FIG. 6 illustrates details in the construction and operation of the lifting device indicated generally at20. The lifting
device 20 employs a support structure in the form of a liftingeye 25 with a threadedshank 26 engaging an internally threadednut member 27. Acircular lift plate 28 is clamped in place between thenut 27 and the base of the body of the liftingeye 25. Anannular lip 29 on thelift plate 28 provides a lift surface or support base for the lower axial end of thetube 11. The radially outer,circumferential end 30 of thelift plate 28 is dimensioned to closely clear the internal surface of the surroundingtube 12 to assist in centralizing thetube 11 as it is lowered into the larger outer tube. In one embodiment of the invention, the design clearance betweenradial end surface 30 and the internal wall of the surroundingtube 12 is approximately 0.030 inch. - The
legs radial end 30 of thelifting device 20. The spring bias force is provided bysprings legs springs legs detents legs outer tube 12. - FIG. 7 illustrates the
lifting device 20 secured to the bottom of theinner tube 11 and theouter tube 12 in preparation for extracting the assembly from the assembly well. The axial end or base of thetube 12 is seen to be supported by a lift surface in the form ofdetents outer tube 12. Thelift plate 28 is illustrated supporting the base of theinner tube 11 on theannular lip 29. Thecircumferential end surface 30 provides a centralizing radially outer surface dimensioned to closely engage the internal wall of the surroundingtube 12 to ensure centralization of thetube 11. - As may best be seen by joint reference to FIGS. 7 through 11, the insulated tube of the present invention includes annular centralizing
rings 40 that are secured along the external surface of thetube 11 to maintain proper spacing between the inner and outer tubes. Alternatingprojections 41 and radially recessedareas 42 formed along the external surface of the centralizingring 40 provide structural support with a minimum amount of surface contact to minimize heat transfer while maintaining adequate structural support between the two tubes. Agap 43 is provided in the centralizing ring to assist in positioning the ring about theinner tube 11. - As may be seen by reference to the cross-section in FIG. 10, the
ring 40 is provided with a curving external surface contour on theprojections 41 to provide a line contact between the centralizing ring and the internal surface of the surroundingtube 12. In one embodiment of the invention, a design clearance of approximately 0.030 inch is provided between the outside diameter of the centralizing ring and the internal diameter of the surroundingtube 12. When the centralizing rings are assembled on the inner tube, theprojections 41 are displaced circumferentially relative to similar projections on adjacent centralizing rings to reduce heat transfer between the two tubes. - The centralizing rings and insulating material are applied to the
inner tube 11 while the tube is horizontally oriented in the work area, as illustrated in FIG. 1. The centralizing rings are positioned at axially spaced locations along the length of thetube 11 and are welded to thetube 11 at the desired axial positions. In one embodiment of the invention, three such centralizing rings are disposed intermediate the ends of thetube 11. - The
tube 11 is provided with annular upsets orradial projections 50 at each tube end to function as centralizers for thetube 11. Theupsets 50 may also be provided by welding an annular ring or other suitable body to the end of the tube and machining the body down to the desired dimension. - Insulating
material 51 is wrapped around thetube 11 between the centralizingrings 40 and theupsets 50 to a diameter slightly less than the outside diameter of the upsets and centralizing rings. The insulation in one embodiment is formed by wrapping alternating layers of aluminum foil and fiber cloth mesh. Getter material may also be included in the composition of the material applied to the external surface of thetube 11. - The
tube 11, as thus equipped with insulation and centralizing rings, is precisely positioned at the desired location within thetube 12 by the operation of thelifting device 20. Thus, as may be seen in FIG. 7, the axial spacing between thedetents lip 29 precisely limits the axial position of theinner tube 11 relative to theouter tube 12. The illustrated axial position is the desired final welding position for the two tubes. - As illustrated in FIG. 11, with the assembly disposed horizontally in the work area, the lifting device and
line 19 are removed, and theupsets 50 are welded, as indicated at 60, to the internal surface of thetube 12. Welding seals the annular area between thetubes inner tube 11 is welded in place, the assembly oftubes insulation 51, and centralizingrings 40 is heat treated, andthreads 70 are machined onto each end of thetube 12. As will be appreciated, the threading is performed after all of the handling, welding, and heat treating are completed to eliminate damage and distortion of the threaded area that would otherwise be caused by these fabrication procedures. - While a preferred form of the present invention has been described in detail with respect to the illustrated embodiments, it will be understood that various additions, changes, and variations in the construction and operation of the present invention may be made without departing from the spirit and scope of the invention, which is more broadly defined in the following claims.
Claims (3)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/357,611 US20030111510A1 (en) | 2000-01-12 | 2003-02-04 | Concentric, insulated tubular conduits and method for assembly |
US11/361,760 US8365775B2 (en) | 2000-01-12 | 2006-02-24 | Concentric, insulated tubular conduits and method for assembly |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/481,619 US6325278B1 (en) | 2000-01-12 | 2000-01-12 | Concentric, insulated tubular conduits and method of assembly |
US09/912,053 US6520732B1 (en) | 2000-01-12 | 2001-07-23 | Concentric, insulated tubular conduits and method of assembly |
US10/357,611 US20030111510A1 (en) | 2000-01-12 | 2003-02-04 | Concentric, insulated tubular conduits and method for assembly |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/912,053 Division US6520732B1 (en) | 2000-01-12 | 2001-07-23 | Concentric, insulated tubular conduits and method of assembly |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/361,760 Continuation US8365775B2 (en) | 2000-01-12 | 2006-02-24 | Concentric, insulated tubular conduits and method for assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030111510A1 true US20030111510A1 (en) | 2003-06-19 |
Family
ID=23912690
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/481,619 Expired - Lifetime US6325278B1 (en) | 2000-01-12 | 2000-01-12 | Concentric, insulated tubular conduits and method of assembly |
US09/912,053 Expired - Lifetime US6520732B1 (en) | 2000-01-12 | 2001-07-23 | Concentric, insulated tubular conduits and method of assembly |
US10/357,611 Abandoned US20030111510A1 (en) | 2000-01-12 | 2003-02-04 | Concentric, insulated tubular conduits and method for assembly |
US11/361,760 Expired - Lifetime US8365775B2 (en) | 2000-01-12 | 2006-02-24 | Concentric, insulated tubular conduits and method for assembly |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/481,619 Expired - Lifetime US6325278B1 (en) | 2000-01-12 | 2000-01-12 | Concentric, insulated tubular conduits and method of assembly |
US09/912,053 Expired - Lifetime US6520732B1 (en) | 2000-01-12 | 2001-07-23 | Concentric, insulated tubular conduits and method of assembly |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US11/361,760 Expired - Lifetime US8365775B2 (en) | 2000-01-12 | 2006-02-24 | Concentric, insulated tubular conduits and method for assembly |
Country Status (1)
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US (4) | US6325278B1 (en) |
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CN105269211A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Liner tube pressing mechanism |
CN105269234A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Liner tube compressing and positioning mechanism |
CN105269235A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Pneumatic dual-air-cylinder type liner positioning mechanism of automobile welding clamp |
CN105269236A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Liner tube positioning device |
CN105382457A (en) * | 2015-11-20 | 2016-03-09 | 重庆天人汽车车身制造有限公司 | Liner tube clamping mechanism for rear axle assembly welding tool |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105269211A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Liner tube pressing mechanism |
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CN105269235A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Pneumatic dual-air-cylinder type liner positioning mechanism of automobile welding clamp |
CN105269236A (en) * | 2015-11-20 | 2016-01-27 | 重庆天人汽车车身制造有限公司 | Liner tube positioning device |
CN105382457A (en) * | 2015-11-20 | 2016-03-09 | 重庆天人汽车车身制造有限公司 | Liner tube clamping mechanism for rear axle assembly welding tool |
CN106736826A (en) * | 2016-12-07 | 2017-05-31 | 贵州黎阳航空动力有限公司 | A kind of tensioner back-up ring |
Also Published As
Publication number | Publication date |
---|---|
US8365775B2 (en) | 2013-02-05 |
US6325278B1 (en) | 2001-12-04 |
US6520732B1 (en) | 2003-02-18 |
US20060208031A1 (en) | 2006-09-21 |
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