CA1209614A - Pipe line coupling - Google Patents
Pipe line couplingInfo
- Publication number
- CA1209614A CA1209614A CA000422852A CA422852A CA1209614A CA 1209614 A CA1209614 A CA 1209614A CA 000422852 A CA000422852 A CA 000422852A CA 422852 A CA422852 A CA 422852A CA 1209614 A CA1209614 A CA 1209614A
- Authority
- CA
- Canada
- Prior art keywords
- connector
- sleeve
- frusto
- sleeve means
- pipe
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
- F16L13/141—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by crimping or rolling from the outside
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/12—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members
- F16L37/14—Joints secured by inserting between mating surfaces an element, e.g. a piece of wire, a pin, a chain
- F16L37/142—Joints secured by inserting between mating surfaces an element, e.g. a piece of wire, a pin, a chain where the securing element is inserted tangentially
- F16L37/148—Joints secured by inserting between mating surfaces an element, e.g. a piece of wire, a pin, a chain where the securing element is inserted tangentially the securing element being flexible
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
ABSTRACT
An apparatus and method for connecting pipe ends. In one embodiment sleeves having serrated inner surfaces are force fit onto the ends of pipe sections. The sleeves are positioned within a tubular connector having oppositely wound helical grooves, with helical grooves in the sleeves adjacent thereto. Wire is fed through a slot in the connector into the chambers formed by the adjacent grooves. The connector is rotated causing the wire to be drawn into the chambers to create a screw and thread effect thus causing the sleeves to be drawn inwardly until frusto-conical surfaces thereon mate to form a firm connection.
An apparatus and method for connecting pipe ends. In one embodiment sleeves having serrated inner surfaces are force fit onto the ends of pipe sections. The sleeves are positioned within a tubular connector having oppositely wound helical grooves, with helical grooves in the sleeves adjacent thereto. Wire is fed through a slot in the connector into the chambers formed by the adjacent grooves. The connector is rotated causing the wire to be drawn into the chambers to create a screw and thread effect thus causing the sleeves to be drawn inwardly until frusto-conical surfaces thereon mate to form a firm connection.
Description
961~
This relates to devices for connecting pipe sections, without the use of welding, particularly for use in the oil and gas industry.
Present pipeline construction techniques entail use of welding to join abutting ends of pipe sections. The use of welding for this purpose is relatively time consuming and requires the use of skilled labour which is expensive and sometimes diffi-cult to obtain.
The present invention is adapted to provide a coupling device which is of such size and configuration as to permit a permanent connection of the ends of pipe sections, without the necessity of welding and at the same time to provide an uninter-~upted continuous surface on the inæide the pipeline at the attachment area.
In accordance with the present invention there is pro-vided in a device for joining pipe sections, first and second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said fir~t and second sleeve means having a cylindrical internal surface with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe sections and to resist with-drawal of said pipe sections from said sleeve means, each said sleeve means including a frusto-conical surEace inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface being adapted to engage a mating frusto-conical surface to form a seal therebetween, a generally cylindrical connector adapted to fit over at least part of said first and second sleeve ~r~
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means, said connector having an internal cylindrical surface with screw means thereon, said first sleeve means ha~ing an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is ro~ated said screw means on said sleeve and connector cause the ends of the pipe to be drawn toward one another and said frusto~
conical mating surfaces to be forced into tight engagement with one another.
In accordance with the present invention there is also provided a device for joining pipe sections comprising Eirst and second generally tubular sleeve means adapted to be attached to an end of a Eirst and second pipe section, respectively, each said -~irst an~ second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to grippingly engage the outer surface of said pipe sec-tion and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at an angle of between S and 10 to the axis of the sleeve means, a generally cylindrical connector adapted to fit over at least part of said first and second sleeve means, said connector havin~ at least one internal cylindrical surface with screw means thereon, said connector having frusto-conical surfaces thereon which are adapted to mate with said frusto-conical sur-faces on said sleeve means to form seals, said first sleeve means having an outer cylindrical surface with screw means ther~on adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said ~_ B
~2(~9614 sleeve and connector are caused to interact to draw the ends of the pipe toward one another and to force said frusto-conical mating surfaces into tight sealing engagement with one another.
In accordance with the present invention there is also provided a device for joining pipe sections comprising first and second generally tubular sleeve means adap~ed to be attached to an end of a first and second pipe section, respectively~ each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage ~he outer surface of said pipe sections and to resist withdrawal of said pipe sections from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the a~is of the sleeve means, said frusto conical surface on said ~irst sleeve means being adapted to engage and mate with said frusto-conical surface on said second sleeve means to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylin-drical surface with screw means thereon, said first sleeve means having an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said sleeve and connector cause the ends of the pipe to be drawn toward one another and said frusto-conical mating surfaces to be forced into tight engagement with one another.
In accordance with the present invention there is also provided a device for joining pipe sections comprising first and - 2a -~' D
second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe section and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface being adapted to engage a mating frusto-conical surface to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylin-drical surface with attachment means thereon, at least one of said sleeve means having an outer cylindrical surface with attachment means thereon adapted to co-operate with said attachment means on said connector, said attachment means on said sleeve means and said connector each comprising a helical groove, said grooves forming a helical passage when placed in juxtaposition, said con-nector including a slot communicating with said helical groove therein for feeding wire into said passage; whereby as said helical groove in said sleeve is positioned within the end of said connector and said wire is fed through said slot into said passage, the frusto-conical surface on said sleeve will be drawn inwardly of said connector and into firm contact with said mating frusto-conical surface.
In accordance with the present invention there is also provided a method of joining pipe ends comprising press fitting a - 2b -B
~2Ç~6:~
sleeve having serrations on the inner surfaces thereof over a pipe end, locating a connector having a helical groove therein over a helical groove in the outer surface of the sleeve, feeding wire through a slot in the connector into a chamber formed by the grooves on the connector and sleeve, rotat:ing the connector to cause the wire to be drawn into said chamber to produce a screw and thread ef~ect causing the sleeve to be drawn inwardly of the eonnector and causing a seal to be formed at a frusto conical surface on said sleeve to thereby form a tight connection.
In drawings which illustrate embodiments of the inven-tion:
Figure 1 is an illustration partially in cross-section, of a Eirst embodiment of a pipe section connecting device, in an assembled state.
Figure la is an illustration of certain of the com-ponents of the embodiment of Figure 1 in an unassembled state.
Figure 2 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
E`igure 3 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
Figure 3a is an illustration of an alternative embodi-ment of the device illustrated in Figure 3O
- 2c -Figure 4 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
Figure 5 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
Figure 6 is an illustration partially in cross~section, of a connecting sleeve in accordance with the invention.
Figure 7 is an illustration partially in cross-section, of a further embodiment of a connecting sleeve in accordance with the invention.
Figure 8 is an illustration partially in cross-section, o~ a Eurther embodiment of a connecting sleeve in accordance with the invention.
Referring now to Figure 1, there is shown a first embodiment of the invention in an assembled form, connecting the ends of pipe sections 13 and 14. The apparatus comprises sleeves 11 and 12 and connector 10. Sleeve 11 is generally tubular in shape and has an inner cylindrical surface 40 of a first diameter and an inner cylindrical surface 41 of somewhat larger diameter than that of the surface 40. Surface 40 includes serrations 20 therein consisting of circumferential ridges for gripping the outer surface of an adjacent pipe section.
The ridges may be formed by machining threads having a generally regular triangular cross-section. Preferably, however, the cross-sectional shape of the ridges is that of an irregular triangle wherein the side of the triangle nearest the centre of ~96~ ~
the sleeve is shorter than the side of the triangle nearer the end of the sleeve. This shape results in an inclination to the ridges which serves to provide less resistance to inward movement of the pipe relative to the sleeve, and at the same time to resist a tendency to withdrawl of the pipe by biting into the surface thereof in response to a force tending to pull the pipe outwardly. Surface 40 also includes spaced recesses 21 which are adapted to serve as resevoirs for holding expoy resin used in mounting the sleeves on the pipe sections.
The outer surface 44 of the sleeve 11 includes a continuous helical slot 29 extending around the circumference khereo~. The end o the sleeve 11 adjacent the slot 29 includes a surface 33 which is inclined to the longitudinal axis of the sleeve at a shallow angle thus forming a frusto conical surface 33.
The second sleeve 12 is identical to the sleeve 11 as described above.
The connector 10 includes an outer cylindrical surface 48 and inner cylindrical surfaces 46 and 47 situated at the ends thereof. The diameter of the surfaces 46 and 47 is slightly greater than the diameter of the surfaces 45 and 44 of sleeves 12 and 11 thereby permitting the connector to be rotated relative to the sleeves.
The connector also includes a central inner cylindrical surface 37, the diamaeter of which substantially, corresponds to ~2~96~4 the inner diameter of the pipe sections 13 and 14. Between the central cylindrical surface 37 and the cylindrical surface 47, there is a frusto conical surface 36 which is congruent to and adapted to mate with, surface 35 on sleeve 12. Similarly frusto conical surface 34 on the other sicLe of the central cylindrical surface 37 is congruent to ancl adapted to mate with, surface 33 on sleeve 11.
On the surface 47 of the connector 10 there is situated a continuous helical slot 32 which corresponds to the slot 30 in the sleeve 13. Similarly surface 46 carries a continuous helical slot 22 which corresponds to the slot 29 in the sleeve 11.
Slots 100 and 105 are situated at the ends of the connector 10 and are preferably slightly tilted to the radius to facilitate feeding wires 23 and 31 into -the helical groove.
To assemble the pipe connector device the sleeves 11 and 12 are first mounted on the ends of the pipes 14 and 13.
This step may be carried out either at the pipe manufacturing facility or in the field. Prior to mounting the sleeves, an epoxy resin is spread in the recesses 21 and 17 and in the serrated portions 20 and 17 of the inner surface of ~he sleeves. The sleeves 11 and 12 are then pressed into place over the ends of the pipes 14 and 13 until the ends of the pipe sections contact abutment surfaces 49 and 50. The epoxy resin serves as a lubricant to permit easier passage of the sleeves and when the sleeves are in place it serves to fix the 961~
sleeves to the pipe sections. The epoxy resin also serves to seal the connection against the ingress of moisture from the outside which would tend to cause corrosion in the connecting device and to seal the connection against the escape of fluids carried by the pipeline~
The end of wire 23 is bent at a right angle and the bent portion is positioned in slot 101 in sleeve 11 illustrated in Figure l(a). Connector 10 is then slid over the end of the frusto conical surface 33 with the slot 100 in the connector aligned with slot 101 in the sleeve until the sleeve can travel no further. At that point, the free end of the wire 23 emerges through the slo~ 100 and the end of the wire 23 will be anchored against displacement by the right angle bend in it situated in slot 101, upon a slight rotation of the connector.
The end of wire 31 is similarly bent at a right angle and placed in corresponding slo~ in the slee~e 12. The sleeve 12 is then pushed as far as it can go into the connector 10 with the corresponding slots in alignment and with the free end of the wire 31 emerging from the slot 105.
The connector 10 is then rotated so that wires 23 and 31 are drawn throucJh the slots 100 and 105 on the ends of the connector 10 and are laid in the helical grooves 22 and 29 on one end and the helical grooves 32 and 30 on the other end.
The wires 23 and 31 mate with the slots in the connector and sleeves in a screw and thread fashion and because the slots are -oppositely threaded, rotation of the connector serves to draw both sleeves into the connector. As rotation of the connector 10 continues, frusto conical surfaces 35 and 36 and 33 and 34 will eventually contact and lodge within one ~Z~6~
another to form a firm connection. Axial forces produced by the connector are transformed into substantial radial forces at the frusto conical surfaces, which are inclined at a shallow angle to the axis. This creates a tendency to expand the element with the female frusto conical surface and provides a tight connection between the elements through high contacting forces present over the relatively large area of the contacting frusto conical surfaces.
With the rotation of the connector 23 and 31 are deformed to tightly fit the slots within which they are situated thereby to prevent backing off of the connector.
Referring now to the embodiment of the invention shown in Figure 2 the major portions of which comprise sleeves 55 and 56 and connector 57. Connector 57 is substantially tubular in shape and has helical grooves 22 and 32 winding in opposite directions, situated on the inner cylindrical surface 58 thereof.
Sleeve 56 includes circumferential serrations or ridges 17 and recesses 18 on its inner cylindrical surface 43.
The outer cylindrical surface 45 includes helical grooves 30 which match grooves 32 on the connector 57. The end of the sleeve 56 adjacent the grooves 32 is inclined at a shallow angle to provide a frusto conical outer surface 51 which is adapted to mate with a frusto conical surface 52 on the sleeve 55, Inner liner cylindrical surface 53 of sleeve 56 is of substantially the same diameter as that of pipe 13. The diamater of the inner cylindrical surface 43 of the sleeve 56 is slightly less than the diameter of the outer surface of pipe section 13 to enable the sleeve 56 to be press fitted on the end of the ~9~
pipe section 13. Sleeve 55 includes circumferential ridges 20 and recesses 21 on the inner surface 41. The upper surface 44 includes helical grooves 29 matching grooves 22 on the connector 57. The end of the sleeve 55 adjacent the helical groove 22 is inclined at a shallow angle relative to the longitudinal axis of the sleeve to provide a frusto conical inner surfac~
52 adapted to mate with a congruent surface 51 on the sleeve 56. The diameter of the inner cylindrical surface 41 of the sleeve 55 is slightly less than the outer diameter of the pipe 14 to enable the sleeve 55 to be press fitted on the end of the pipe.
The assembly procedure is similar to that used with the first embodiment. The sleeves 55 and 56 having a layer of epoxy resin on the inner surfaces to provide lubrication and to assist ~onding, are press fitted on to the ends of pipe sections 14 and 13. The connector 57 is then slid over sleeve 56 and the sleeves 56 and 57 are aligned and correctly spaced~ A bent end of wire 23 is placed in a slot (not shown) on the outer surface of sleeve 55 and connector 57 is slid over the end of sleeve 55 with slot 102 on the end thereof in alignment with the slot on the sleeve 55 and wire 23 emerging therefrom. The conne~tor 57 is then rotated until slot 103 coincides with the slot in the surface of sleeve 56. The bent end of wire 31 is placed in the slot in the sleeve 56 with the free end emerging from slot 103. The connector 57 is then rotated causing the wires 23 and 31 to be drawn into and laid down in the helical grooves in the connector and sleeves thereby acting as screws and threads. Because one acts as a left hand screw and thread and the other acts as a right hand screw and thread, rotation of the connector 57 will serve to draw both of the sleeves into the connector. Eventually the frusto conical surfaces 51 and 52 on the sleeves 56 and 55 will contact and firmly mate to form a strong bond. At the same time the wires 23 and 31 will tightly fit the helical grooves to produce a permanent connection and seal.
It will be appreciated that when the device is assembled with the pipe sections, the inner surfaces of the pipe sections 14 and 13 together with the surface 53 of the sleeve 56 will form a smooth substantially continuous surface which is uninterrupted by discontinuites in cross-section.
In the embodirnent shown in Figure 3 the sleeve 60 includes an integral ring 15 on its outer surface. The connactor 58 includes an inwardly projecting flange 61 having surface 16 adapted to rotatably bear on surface 28 of the ring 15. It will readily be appreciated that the connector coacts with the sleeve 60 by means of the contacting flange 61 and ring 15.
Connector 58 is slid to the right exposing frusto conical surface 18. Sleeves 59 and 60 are axially aligned and brought together with female frusto conical surface 19 on sleeve 59 contacting male frusto conical surface 18 on sleeve 60.
Connector 58 is slid to the left with slot 108 in alignment with the slot on the surface of the connector 59. The bent end of wire 23 is placed in the slot on the onnector 59 with the free end emerging through slo-t 108. The connector 58 is then rotated causing wire 23 to be laid in slots 29 and 22 and creating a force tending to press the sleeves 59 and 60 together.
_ g _ ~:05'~i14 An advantage of this embodiment which employs a single thread and a pair of coacting rings, is that it permits the connector to be slid back and the sleeves to be fully engaged before the connector is screwed into place to provide the engaging force on the sleeves.
As with the other embodiments a substantially continuous inner surface is provided by the inner walls of the pipe sections 14 and 13 the surface 64 of sleeve 59 and the surface 27 of sleeve 60 and a strong connection is formed by the mating frusto-conical surfaces.
Figure 4 discloses an embodiment which is substantially similar to Figure 3. Instead of using a wire situated in a helical grove as a thread, a thread 68 has been machined on the outer surface of the sleeve 65. The thread 68 is adapted to engage the connector 66 and to provide, upon rotation of the connector, the engaging force which causes frusto conical surfaces 69 and 70 to mate and form a strong union.
The embodiment of Figure 4 is particularly suited for use where it is desired to be able to disconnect the pipe sections, since the use of the machined thread permits the connector to be disassembled and reassembled.
Figure 3a shows a further embodiment wherein the pipe ends abut one another at 114 thus permitting contact only between the pipeline and the contents thereof and avoiding any contact between the material of the sleeves and the contents of ~2~96~ ~
the pipeline. Such an arrangement is particularly suitable for avoiding corrosion, particularly where the pipeline is adapted to carry sour gases.
As will be seen from Figure 3a, the sleeves are fitted on the ends of ~he pipe sections so that the end of pipe section 14 upon assembly substantially coincides with the inner edge of frusto conical surface 112 on sleeve 110 and the end of pipe section 13 upon assembly substantially coincides with the outer edge of frusto conical surface 111 on sleeve 109.
The procedure for assembling the device will be essentially the same as described in relation to the embodiment oE Figure 3. Upon assembly chamfered edges of the ends of the pip~s 1~ and 13 will form a V-shaped ring 115 containing epoxy resin to Eorm a seal.
It will be appreciated that the embodiments of Figures 1, 2, 4 and 5 may similarly be constructed so that the ends of the pipe abut in order to avoid contact between the contents of the pipeline and the material carried by the pipe.
The embodiment shown in Figure 5 includes a locking ring 7~ mounted in a circumferential slot 77 in the sleeve 76.
The locking ring is composed of high tensile steel and has a gap therein which permits it to be elastically deformed to a required extent. After the sleeve 76 with the ring 72 mounted in slot 7~ therein, is fitted on the end of pipe section 14, connector 71 is then mounted by inserting it over tapered end of the sleeve 76 and pressing it in the direction of the ring 72. Chamfered surface 73 on the forward end of connector 71 will contact chamfered surface 75 on the ring 72 and continued 9 6 :~ ~
pressure on the connector will cause the ring 72 to be compressed thus permitting surface 78 on the connector 71 to ride over the ring 72. When the ring 72 reaches the area 79 of enlarged diameter it will spring back into its original shape thereby locking the connector 71 in the position shown in Figure 5. The ring is dimensioned to permit movement of the connector 71 relative to the sleeve 76.
To connect the pipe sections 13 and 14, to which sleeves 76 and 77 are attached~ the pipes are axially aligned, and frusto conical surfaces 80 and 81 are pressed into engage~ent.
The connector 71 is then brought into contact so that the threaded surfaces 83 and 82 engage and the connector 71 is rotated to produce the engaging force on the melting frusto conical surfaces.
In order to obtain optimum locking engagement of the mating contacting frusto conical surfaces in the previously described embodiments, such surfaces should be inclined at a relatively shallow angle, preferably in the order of between 5 and 10 degrees to the central axis thereof.
The wire used as threads in the foregoing embodiments ma~ comprise a high strength low carbon steel having a yield strength in the range of 60,000 to 80,000 psi.
Figure 6 illustrates a connector consisting of a single sleeve 85. Sleeve 85 is adapted to be attached to ends of adjacent pipe sections by force fitting the sleeve 85 into the inside of the ends of the pipe sections. The sleeve 85 includes circumferential serrations or sharp ridges 81 of gradually decreasing diamater toward the ends .
of the sleeve. The maximum diameters of the ridges are slightly greater than the inside diameter of the pipe sections to be joined. The sleeve 85 also includes a central portion 84 having maximum thickness and maximum outer diameter. The ends of the central position 84 include recesses 83 and 82 for receiving and holding the ends of the pipe sections therein.
To join pipe sections the ends of the sleeve are forced into place inside the pipe sections using a larger of epoxy resin as a lubricant and sealing means, until the ends of the pipe are positioned in and are lodged in recesses 82 and 83.
The emhodiment illustrated in Figure 6 is adapted for use in a low pressure pipeline.
The connector illustrated in Figure 7 comprises a single sleeve 86 for force fitting over the ends of adjacent pipe sections, to join the pipe sections.
The connector 86 includes inner cylindrical surfaces 91 at each end having a diameter slightly greater than the outer diameter of the pipe sections to be joined. In the central region of the sleeve 86 there is a recess 87 the diameter of which is slightly greater than the outside dia~eter of the pipes. This recess is used as a reservoir for epoxy resin. On each side of recess 87 there is a cylindrical sur~ace 89 having a diameter slightly less than the outside diameter of the pipes. Between surfaces 89 and surface 91 there are a series of circumferential sharp ridges or seratives 90 the maximum internal diameter of ~zo~
which is slightly less than the outer diameter of the pipe.
As with the other embodiment the sharp edges of these ridges are directed somewhat to ward the centre of the sleeve to facility entry of the pipe into the sleeve and to provide a biting action into the pipe to resist withdrawal of the pipe.
To join pipe sections, epoxy resin is spread in the areas of recess 87 and serratiors 90 and the pipe ends are forced into the respective ends of the sleeve 86 until the abut at the centre of area 87.
Figure 8 illustrates an embodiment simila~ to that o~ Figure 7 but i~cluding recesses 92 in the area of s~rra~ions or ridges 90, which serve as epoxy resin reservoirs.
This device is assembled in a similar manner to that described in relation to the embodiment illustrated in Figure 7.
,~ .,
This relates to devices for connecting pipe sections, without the use of welding, particularly for use in the oil and gas industry.
Present pipeline construction techniques entail use of welding to join abutting ends of pipe sections. The use of welding for this purpose is relatively time consuming and requires the use of skilled labour which is expensive and sometimes diffi-cult to obtain.
The present invention is adapted to provide a coupling device which is of such size and configuration as to permit a permanent connection of the ends of pipe sections, without the necessity of welding and at the same time to provide an uninter-~upted continuous surface on the inæide the pipeline at the attachment area.
In accordance with the present invention there is pro-vided in a device for joining pipe sections, first and second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said fir~t and second sleeve means having a cylindrical internal surface with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe sections and to resist with-drawal of said pipe sections from said sleeve means, each said sleeve means including a frusto-conical surEace inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface being adapted to engage a mating frusto-conical surface to form a seal therebetween, a generally cylindrical connector adapted to fit over at least part of said first and second sleeve ~r~
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means, said connector having an internal cylindrical surface with screw means thereon, said first sleeve means ha~ing an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is ro~ated said screw means on said sleeve and connector cause the ends of the pipe to be drawn toward one another and said frusto~
conical mating surfaces to be forced into tight engagement with one another.
In accordance with the present invention there is also provided a device for joining pipe sections comprising Eirst and second generally tubular sleeve means adapted to be attached to an end of a Eirst and second pipe section, respectively, each said -~irst an~ second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to grippingly engage the outer surface of said pipe sec-tion and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at an angle of between S and 10 to the axis of the sleeve means, a generally cylindrical connector adapted to fit over at least part of said first and second sleeve means, said connector havin~ at least one internal cylindrical surface with screw means thereon, said connector having frusto-conical surfaces thereon which are adapted to mate with said frusto-conical sur-faces on said sleeve means to form seals, said first sleeve means having an outer cylindrical surface with screw means ther~on adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said ~_ B
~2(~9614 sleeve and connector are caused to interact to draw the ends of the pipe toward one another and to force said frusto-conical mating surfaces into tight sealing engagement with one another.
In accordance with the present invention there is also provided a device for joining pipe sections comprising first and second generally tubular sleeve means adap~ed to be attached to an end of a first and second pipe section, respectively~ each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage ~he outer surface of said pipe sections and to resist withdrawal of said pipe sections from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the a~is of the sleeve means, said frusto conical surface on said ~irst sleeve means being adapted to engage and mate with said frusto-conical surface on said second sleeve means to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylin-drical surface with screw means thereon, said first sleeve means having an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said sleeve and connector cause the ends of the pipe to be drawn toward one another and said frusto-conical mating surfaces to be forced into tight engagement with one another.
In accordance with the present invention there is also provided a device for joining pipe sections comprising first and - 2a -~' D
second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe section and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface being adapted to engage a mating frusto-conical surface to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylin-drical surface with attachment means thereon, at least one of said sleeve means having an outer cylindrical surface with attachment means thereon adapted to co-operate with said attachment means on said connector, said attachment means on said sleeve means and said connector each comprising a helical groove, said grooves forming a helical passage when placed in juxtaposition, said con-nector including a slot communicating with said helical groove therein for feeding wire into said passage; whereby as said helical groove in said sleeve is positioned within the end of said connector and said wire is fed through said slot into said passage, the frusto-conical surface on said sleeve will be drawn inwardly of said connector and into firm contact with said mating frusto-conical surface.
In accordance with the present invention there is also provided a method of joining pipe ends comprising press fitting a - 2b -B
~2Ç~6:~
sleeve having serrations on the inner surfaces thereof over a pipe end, locating a connector having a helical groove therein over a helical groove in the outer surface of the sleeve, feeding wire through a slot in the connector into a chamber formed by the grooves on the connector and sleeve, rotat:ing the connector to cause the wire to be drawn into said chamber to produce a screw and thread ef~ect causing the sleeve to be drawn inwardly of the eonnector and causing a seal to be formed at a frusto conical surface on said sleeve to thereby form a tight connection.
In drawings which illustrate embodiments of the inven-tion:
Figure 1 is an illustration partially in cross-section, of a Eirst embodiment of a pipe section connecting device, in an assembled state.
Figure la is an illustration of certain of the com-ponents of the embodiment of Figure 1 in an unassembled state.
Figure 2 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
E`igure 3 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
Figure 3a is an illustration of an alternative embodi-ment of the device illustrated in Figure 3O
- 2c -Figure 4 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
Figure 5 is an illustration partially in cross-section, of a further embodiment of a pipe section connecting device, in an assembled state.
Figure 6 is an illustration partially in cross~section, of a connecting sleeve in accordance with the invention.
Figure 7 is an illustration partially in cross-section, of a further embodiment of a connecting sleeve in accordance with the invention.
Figure 8 is an illustration partially in cross-section, o~ a Eurther embodiment of a connecting sleeve in accordance with the invention.
Referring now to Figure 1, there is shown a first embodiment of the invention in an assembled form, connecting the ends of pipe sections 13 and 14. The apparatus comprises sleeves 11 and 12 and connector 10. Sleeve 11 is generally tubular in shape and has an inner cylindrical surface 40 of a first diameter and an inner cylindrical surface 41 of somewhat larger diameter than that of the surface 40. Surface 40 includes serrations 20 therein consisting of circumferential ridges for gripping the outer surface of an adjacent pipe section.
The ridges may be formed by machining threads having a generally regular triangular cross-section. Preferably, however, the cross-sectional shape of the ridges is that of an irregular triangle wherein the side of the triangle nearest the centre of ~96~ ~
the sleeve is shorter than the side of the triangle nearer the end of the sleeve. This shape results in an inclination to the ridges which serves to provide less resistance to inward movement of the pipe relative to the sleeve, and at the same time to resist a tendency to withdrawl of the pipe by biting into the surface thereof in response to a force tending to pull the pipe outwardly. Surface 40 also includes spaced recesses 21 which are adapted to serve as resevoirs for holding expoy resin used in mounting the sleeves on the pipe sections.
The outer surface 44 of the sleeve 11 includes a continuous helical slot 29 extending around the circumference khereo~. The end o the sleeve 11 adjacent the slot 29 includes a surface 33 which is inclined to the longitudinal axis of the sleeve at a shallow angle thus forming a frusto conical surface 33.
The second sleeve 12 is identical to the sleeve 11 as described above.
The connector 10 includes an outer cylindrical surface 48 and inner cylindrical surfaces 46 and 47 situated at the ends thereof. The diameter of the surfaces 46 and 47 is slightly greater than the diameter of the surfaces 45 and 44 of sleeves 12 and 11 thereby permitting the connector to be rotated relative to the sleeves.
The connector also includes a central inner cylindrical surface 37, the diamaeter of which substantially, corresponds to ~2~96~4 the inner diameter of the pipe sections 13 and 14. Between the central cylindrical surface 37 and the cylindrical surface 47, there is a frusto conical surface 36 which is congruent to and adapted to mate with, surface 35 on sleeve 12. Similarly frusto conical surface 34 on the other sicLe of the central cylindrical surface 37 is congruent to ancl adapted to mate with, surface 33 on sleeve 11.
On the surface 47 of the connector 10 there is situated a continuous helical slot 32 which corresponds to the slot 30 in the sleeve 13. Similarly surface 46 carries a continuous helical slot 22 which corresponds to the slot 29 in the sleeve 11.
Slots 100 and 105 are situated at the ends of the connector 10 and are preferably slightly tilted to the radius to facilitate feeding wires 23 and 31 into -the helical groove.
To assemble the pipe connector device the sleeves 11 and 12 are first mounted on the ends of the pipes 14 and 13.
This step may be carried out either at the pipe manufacturing facility or in the field. Prior to mounting the sleeves, an epoxy resin is spread in the recesses 21 and 17 and in the serrated portions 20 and 17 of the inner surface of ~he sleeves. The sleeves 11 and 12 are then pressed into place over the ends of the pipes 14 and 13 until the ends of the pipe sections contact abutment surfaces 49 and 50. The epoxy resin serves as a lubricant to permit easier passage of the sleeves and when the sleeves are in place it serves to fix the 961~
sleeves to the pipe sections. The epoxy resin also serves to seal the connection against the ingress of moisture from the outside which would tend to cause corrosion in the connecting device and to seal the connection against the escape of fluids carried by the pipeline~
The end of wire 23 is bent at a right angle and the bent portion is positioned in slot 101 in sleeve 11 illustrated in Figure l(a). Connector 10 is then slid over the end of the frusto conical surface 33 with the slot 100 in the connector aligned with slot 101 in the sleeve until the sleeve can travel no further. At that point, the free end of the wire 23 emerges through the slo~ 100 and the end of the wire 23 will be anchored against displacement by the right angle bend in it situated in slot 101, upon a slight rotation of the connector.
The end of wire 31 is similarly bent at a right angle and placed in corresponding slo~ in the slee~e 12. The sleeve 12 is then pushed as far as it can go into the connector 10 with the corresponding slots in alignment and with the free end of the wire 31 emerging from the slot 105.
The connector 10 is then rotated so that wires 23 and 31 are drawn throucJh the slots 100 and 105 on the ends of the connector 10 and are laid in the helical grooves 22 and 29 on one end and the helical grooves 32 and 30 on the other end.
The wires 23 and 31 mate with the slots in the connector and sleeves in a screw and thread fashion and because the slots are -oppositely threaded, rotation of the connector serves to draw both sleeves into the connector. As rotation of the connector 10 continues, frusto conical surfaces 35 and 36 and 33 and 34 will eventually contact and lodge within one ~Z~6~
another to form a firm connection. Axial forces produced by the connector are transformed into substantial radial forces at the frusto conical surfaces, which are inclined at a shallow angle to the axis. This creates a tendency to expand the element with the female frusto conical surface and provides a tight connection between the elements through high contacting forces present over the relatively large area of the contacting frusto conical surfaces.
With the rotation of the connector 23 and 31 are deformed to tightly fit the slots within which they are situated thereby to prevent backing off of the connector.
Referring now to the embodiment of the invention shown in Figure 2 the major portions of which comprise sleeves 55 and 56 and connector 57. Connector 57 is substantially tubular in shape and has helical grooves 22 and 32 winding in opposite directions, situated on the inner cylindrical surface 58 thereof.
Sleeve 56 includes circumferential serrations or ridges 17 and recesses 18 on its inner cylindrical surface 43.
The outer cylindrical surface 45 includes helical grooves 30 which match grooves 32 on the connector 57. The end of the sleeve 56 adjacent the grooves 32 is inclined at a shallow angle to provide a frusto conical outer surface 51 which is adapted to mate with a frusto conical surface 52 on the sleeve 55, Inner liner cylindrical surface 53 of sleeve 56 is of substantially the same diameter as that of pipe 13. The diamater of the inner cylindrical surface 43 of the sleeve 56 is slightly less than the diameter of the outer surface of pipe section 13 to enable the sleeve 56 to be press fitted on the end of the ~9~
pipe section 13. Sleeve 55 includes circumferential ridges 20 and recesses 21 on the inner surface 41. The upper surface 44 includes helical grooves 29 matching grooves 22 on the connector 57. The end of the sleeve 55 adjacent the helical groove 22 is inclined at a shallow angle relative to the longitudinal axis of the sleeve to provide a frusto conical inner surfac~
52 adapted to mate with a congruent surface 51 on the sleeve 56. The diameter of the inner cylindrical surface 41 of the sleeve 55 is slightly less than the outer diameter of the pipe 14 to enable the sleeve 55 to be press fitted on the end of the pipe.
The assembly procedure is similar to that used with the first embodiment. The sleeves 55 and 56 having a layer of epoxy resin on the inner surfaces to provide lubrication and to assist ~onding, are press fitted on to the ends of pipe sections 14 and 13. The connector 57 is then slid over sleeve 56 and the sleeves 56 and 57 are aligned and correctly spaced~ A bent end of wire 23 is placed in a slot (not shown) on the outer surface of sleeve 55 and connector 57 is slid over the end of sleeve 55 with slot 102 on the end thereof in alignment with the slot on the sleeve 55 and wire 23 emerging therefrom. The conne~tor 57 is then rotated until slot 103 coincides with the slot in the surface of sleeve 56. The bent end of wire 31 is placed in the slot in the sleeve 56 with the free end emerging from slot 103. The connector 57 is then rotated causing the wires 23 and 31 to be drawn into and laid down in the helical grooves in the connector and sleeves thereby acting as screws and threads. Because one acts as a left hand screw and thread and the other acts as a right hand screw and thread, rotation of the connector 57 will serve to draw both of the sleeves into the connector. Eventually the frusto conical surfaces 51 and 52 on the sleeves 56 and 55 will contact and firmly mate to form a strong bond. At the same time the wires 23 and 31 will tightly fit the helical grooves to produce a permanent connection and seal.
It will be appreciated that when the device is assembled with the pipe sections, the inner surfaces of the pipe sections 14 and 13 together with the surface 53 of the sleeve 56 will form a smooth substantially continuous surface which is uninterrupted by discontinuites in cross-section.
In the embodirnent shown in Figure 3 the sleeve 60 includes an integral ring 15 on its outer surface. The connactor 58 includes an inwardly projecting flange 61 having surface 16 adapted to rotatably bear on surface 28 of the ring 15. It will readily be appreciated that the connector coacts with the sleeve 60 by means of the contacting flange 61 and ring 15.
Connector 58 is slid to the right exposing frusto conical surface 18. Sleeves 59 and 60 are axially aligned and brought together with female frusto conical surface 19 on sleeve 59 contacting male frusto conical surface 18 on sleeve 60.
Connector 58 is slid to the left with slot 108 in alignment with the slot on the surface of the connector 59. The bent end of wire 23 is placed in the slot on the onnector 59 with the free end emerging through slo-t 108. The connector 58 is then rotated causing wire 23 to be laid in slots 29 and 22 and creating a force tending to press the sleeves 59 and 60 together.
_ g _ ~:05'~i14 An advantage of this embodiment which employs a single thread and a pair of coacting rings, is that it permits the connector to be slid back and the sleeves to be fully engaged before the connector is screwed into place to provide the engaging force on the sleeves.
As with the other embodiments a substantially continuous inner surface is provided by the inner walls of the pipe sections 14 and 13 the surface 64 of sleeve 59 and the surface 27 of sleeve 60 and a strong connection is formed by the mating frusto-conical surfaces.
Figure 4 discloses an embodiment which is substantially similar to Figure 3. Instead of using a wire situated in a helical grove as a thread, a thread 68 has been machined on the outer surface of the sleeve 65. The thread 68 is adapted to engage the connector 66 and to provide, upon rotation of the connector, the engaging force which causes frusto conical surfaces 69 and 70 to mate and form a strong union.
The embodiment of Figure 4 is particularly suited for use where it is desired to be able to disconnect the pipe sections, since the use of the machined thread permits the connector to be disassembled and reassembled.
Figure 3a shows a further embodiment wherein the pipe ends abut one another at 114 thus permitting contact only between the pipeline and the contents thereof and avoiding any contact between the material of the sleeves and the contents of ~2~96~ ~
the pipeline. Such an arrangement is particularly suitable for avoiding corrosion, particularly where the pipeline is adapted to carry sour gases.
As will be seen from Figure 3a, the sleeves are fitted on the ends of ~he pipe sections so that the end of pipe section 14 upon assembly substantially coincides with the inner edge of frusto conical surface 112 on sleeve 110 and the end of pipe section 13 upon assembly substantially coincides with the outer edge of frusto conical surface 111 on sleeve 109.
The procedure for assembling the device will be essentially the same as described in relation to the embodiment oE Figure 3. Upon assembly chamfered edges of the ends of the pip~s 1~ and 13 will form a V-shaped ring 115 containing epoxy resin to Eorm a seal.
It will be appreciated that the embodiments of Figures 1, 2, 4 and 5 may similarly be constructed so that the ends of the pipe abut in order to avoid contact between the contents of the pipeline and the material carried by the pipe.
The embodiment shown in Figure 5 includes a locking ring 7~ mounted in a circumferential slot 77 in the sleeve 76.
The locking ring is composed of high tensile steel and has a gap therein which permits it to be elastically deformed to a required extent. After the sleeve 76 with the ring 72 mounted in slot 7~ therein, is fitted on the end of pipe section 14, connector 71 is then mounted by inserting it over tapered end of the sleeve 76 and pressing it in the direction of the ring 72. Chamfered surface 73 on the forward end of connector 71 will contact chamfered surface 75 on the ring 72 and continued 9 6 :~ ~
pressure on the connector will cause the ring 72 to be compressed thus permitting surface 78 on the connector 71 to ride over the ring 72. When the ring 72 reaches the area 79 of enlarged diameter it will spring back into its original shape thereby locking the connector 71 in the position shown in Figure 5. The ring is dimensioned to permit movement of the connector 71 relative to the sleeve 76.
To connect the pipe sections 13 and 14, to which sleeves 76 and 77 are attached~ the pipes are axially aligned, and frusto conical surfaces 80 and 81 are pressed into engage~ent.
The connector 71 is then brought into contact so that the threaded surfaces 83 and 82 engage and the connector 71 is rotated to produce the engaging force on the melting frusto conical surfaces.
In order to obtain optimum locking engagement of the mating contacting frusto conical surfaces in the previously described embodiments, such surfaces should be inclined at a relatively shallow angle, preferably in the order of between 5 and 10 degrees to the central axis thereof.
The wire used as threads in the foregoing embodiments ma~ comprise a high strength low carbon steel having a yield strength in the range of 60,000 to 80,000 psi.
Figure 6 illustrates a connector consisting of a single sleeve 85. Sleeve 85 is adapted to be attached to ends of adjacent pipe sections by force fitting the sleeve 85 into the inside of the ends of the pipe sections. The sleeve 85 includes circumferential serrations or sharp ridges 81 of gradually decreasing diamater toward the ends .
of the sleeve. The maximum diameters of the ridges are slightly greater than the inside diameter of the pipe sections to be joined. The sleeve 85 also includes a central portion 84 having maximum thickness and maximum outer diameter. The ends of the central position 84 include recesses 83 and 82 for receiving and holding the ends of the pipe sections therein.
To join pipe sections the ends of the sleeve are forced into place inside the pipe sections using a larger of epoxy resin as a lubricant and sealing means, until the ends of the pipe are positioned in and are lodged in recesses 82 and 83.
The emhodiment illustrated in Figure 6 is adapted for use in a low pressure pipeline.
The connector illustrated in Figure 7 comprises a single sleeve 86 for force fitting over the ends of adjacent pipe sections, to join the pipe sections.
The connector 86 includes inner cylindrical surfaces 91 at each end having a diameter slightly greater than the outer diameter of the pipe sections to be joined. In the central region of the sleeve 86 there is a recess 87 the diameter of which is slightly greater than the outside dia~eter of the pipes. This recess is used as a reservoir for epoxy resin. On each side of recess 87 there is a cylindrical sur~ace 89 having a diameter slightly less than the outside diameter of the pipes. Between surfaces 89 and surface 91 there are a series of circumferential sharp ridges or seratives 90 the maximum internal diameter of ~zo~
which is slightly less than the outer diameter of the pipe.
As with the other embodiment the sharp edges of these ridges are directed somewhat to ward the centre of the sleeve to facility entry of the pipe into the sleeve and to provide a biting action into the pipe to resist withdrawal of the pipe.
To join pipe sections, epoxy resin is spread in the areas of recess 87 and serratiors 90 and the pipe ends are forced into the respective ends of the sleeve 86 until the abut at the centre of area 87.
Figure 8 illustrates an embodiment simila~ to that o~ Figure 7 but i~cluding recesses 92 in the area of s~rra~ions or ridges 90, which serve as epoxy resin reservoirs.
This device is assembled in a similar manner to that described in relation to the embodiment illustrated in Figure 7.
,~ .,
Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a device for joining pipe sections, first and second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe sections and to resist withdrawal of said pipe sections from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface being adapted to engage a mating frusto-conical surface to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having an internal cylindrical sur-face with screw means thereon, said first sleeve means having an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said sleeve and connector cause the ends of the pipe to be drawn toward one another and said frusto-conical mating surfaces to be forced into tight engagement with one another.
2. A device for joining pipe sections comprising first and second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to grippingly engage the outer surface of said pipe sec-tion and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at an angle of between 5 and 10° to the axis of the sleeve means, a generally cylindrical connector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylindrical surface with screw means thereon, said connector having frusto-conical surfaces thereon which are adapted to mate with said frusto-conical sur-faces on said sleeve means to form seals, said first sleeve means having an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said sleeve and connector are caused to interact to draw the ends of the pipe toward one another and to force said frusto-conical mating surfaces into tight sealing engagement with one another.
3. A device for joining pipe sections comprising first and second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe sections and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface on said first sleeve means being adapted to engage and mate with said frusto-conical surface on said second sleeve means to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylin-drical surface with screw means thereon, said first sleeve means having an outer cylindrical surface with screw means thereon adapted to co-operate with said screw means on said connector, whereby as said connector is rotated said screw means on said sleeve and connector cause the ends of the pipe to be drawn toward one another and said frusto-conical mating surfaces to be forced into tight engagement with one another.
4. A device in accordance with claims 1, 2 or 3 wherein said second sleeve means includes an outer cylindrical surface with screw means thereon, said screw means on said connector is situated at each end thereof and is adapted to co-operate with said screw means on said sleeves, said screw means on said con-nector being left hand wound at one end and being right hand wound at the other end so that upon rotation of said connector both of said sleeves and attached pipe sections are drawn inwardly of the connector and the mating frusto-conical surfaces are pressed into sealing contact.
5. In a device in accordance with claims 1, 2 or 3 wherein said connector and said second sleeve are connected by means of flanges thereon which permit relative rotation without longitu-dinal movement between said connector and said second sleeve, whereby as said connector is rotated said first sleeve and said first pipe section attached thereto are drawn inwardly of the connector and the mating frusto-conical surfaces are pressed into sealing contact.
6. In a device in accordance with claims 1, 2, or 3, where-in said screw means on said sleeve means comprises a continuous helical groove on said outer surface thereof and said screw means on said connector comprises a continuous helical groove on said inner surface thereof and a slot communicating with said groove for feeding wire into said groove, whereby when said sleeve means is positioned within said connector the respective grooves form a continuous helical passage adapted to enclose a wire therein for connecting said connector and said sleeve means.
7. In a device in accordance with claims 1, 2, or 3, where-in said screw means on said sleeve means and said connector, com-prise helical threads adapted to intermesh with one another.
8. A device for joining pipe sections comprising first and second generally tubular sleeve means adapted to be attached to an end of a first and second pipe section, respectively, each said first and second sleeve means having a cylindrical internal sur-face with pointed projections thereon, said projections being adapted to engage the outer surface of said pipe section and to resist withdrawal of said pipe section from said sleeve means, each said sleeve means including a frusto-conical surface inclined at a shallow angle to the axis of the sleeve means, said frusto-conical surface being adapted to engage a mating frusto-conical surface to form a seal therebetween, a generally cylindrical con-nector adapted to fit over at least part of said first and second sleeve means, said connector having at least one internal cylin-drical surface with attachment means thereon, at least one of said sleeve means having an outer cylindrical surface with attachment means thereon adapted to co-operate with said attachment means on said connector, said attachment means on said sleeve means and said connector each comprising a helical groove, said grooves forming a helical passage when placed in juxtaposition, said con-nector including a slot communicating with said helical groove therein for feeding wire into said passage; whereby as said helical groove in said sleeve is positioned within the end of said connector and said wire is fed through said slot into said passage, the frusto-conical surface on said sleeve will be drawn inwardly of said connector and into firm contact with said mating frusto-conical surface.
9. A device in accordance with claims 1, 2, or 8, wherein ends of said pipe sections are held in abutting contact and epoxy resin is used to assist in sealing said connection.
10. A device in accordance with claims 1, 2, or 8, wherein said sleeves include recesses in the area of said sharp pro-jections to provide reservoirs for epoxy resin.
11. A device according to claims 1, 2, or 3, wherein said sharp projections comprise circumferential ridges having a tri-angular cross-section.
12. A method of joining pipe ends comprising press fitting a sleeve having serrations on the inner surfaces thereof over a pipe end, locating a connector having a helical groove therein over a helical groove in the outer surface of the sleeve, feeding wire through a slot in the connector into a chamber formed by the grooves on the connector and sleeve, rotating the connector to cause the wire to be drawn into said chamber to produce a screw and thread effect causing the sleeve to be drawn inwardly of the connector and causing a seal to be formed at a frusto-conical surface on said sleeve to thereby form a tight connection.
13. The method according to claim 12 including the steps of press fitting sleeves to two pipe ends, locating a connector having oppositely wound helical grooves therein over corresponding helical grooves in said sleeves, feeding wires through slots in the connector into the chambers formed by the slots and rotating said connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000422852A CA1209614A (en) | 1983-03-04 | 1983-03-04 | Pipe line coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000422852A CA1209614A (en) | 1983-03-04 | 1983-03-04 | Pipe line coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1209614A true CA1209614A (en) | 1986-08-12 |
Family
ID=4124705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000422852A Expired CA1209614A (en) | 1983-03-04 | 1983-03-04 | Pipe line coupling |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1209614A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0873431A1 (en) * | 1995-10-27 | 1998-10-28 | Vanderstraeten E. Bvba | Apparatus for affixing a rotating cylindrical magnetron target to a spindle |
| US20200003343A1 (en) * | 2018-06-29 | 2020-01-02 | Varco I/P, Inc. | High pressure composite pipe joining system |
-
1983
- 1983-03-04 CA CA000422852A patent/CA1209614A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0873431A1 (en) * | 1995-10-27 | 1998-10-28 | Vanderstraeten E. Bvba | Apparatus for affixing a rotating cylindrical magnetron target to a spindle |
| EP0873431B1 (en) * | 1995-10-27 | 2012-05-23 | Bekaert Advanced Coatings | Cylindrical magnetron target structure and apparatus for affixing said target structure to a rotatable spindle |
| US20200003343A1 (en) * | 2018-06-29 | 2020-01-02 | Varco I/P, Inc. | High pressure composite pipe joining system |
| US11703170B2 (en) * | 2018-06-29 | 2023-07-18 | Varco I/P, Inc. | High pressure composite pipe joining system |
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| Date | Code | Title | Description |
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| MKEX | Expiry |