CA1230298A - Pipe termination - Google Patents
Pipe terminationInfo
- Publication number
- CA1230298A CA1230298A CA000430458A CA430458A CA1230298A CA 1230298 A CA1230298 A CA 1230298A CA 000430458 A CA000430458 A CA 000430458A CA 430458 A CA430458 A CA 430458A CA 1230298 A CA1230298 A CA 1230298A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- flange
- terminating
- insert
- over
- 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
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- Butt Welding And Welding Of Specific Article (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
PIPE TERMINATION
By: Craig Weems and John Coburn ABSTRACT OF THE DISCLOSURE
A pipe termination, and method of making it, comprised of a tubular metal sleeve insert having one end welded to a terminating flange and having an annular slot in its midregion that is filled with a heat retardant material. This subassembly is coated with a baked plastic material that extends continuously from the connecting face of the flange, through the metal insert and over the opposite end. The subassembly is inserted within the end of a pipe and the pipe end and innermost end of the flange butt each other immediately above the heat retardant material on the insert. The pipe and flange are welded together at their butting regions and the heat retardant material prevents the baked coating on the insert from burning.
By: Craig Weems and John Coburn ABSTRACT OF THE DISCLOSURE
A pipe termination, and method of making it, comprised of a tubular metal sleeve insert having one end welded to a terminating flange and having an annular slot in its midregion that is filled with a heat retardant material. This subassembly is coated with a baked plastic material that extends continuously from the connecting face of the flange, through the metal insert and over the opposite end. The subassembly is inserted within the end of a pipe and the pipe end and innermost end of the flange butt each other immediately above the heat retardant material on the insert. The pipe and flange are welded together at their butting regions and the heat retardant material prevents the baked coating on the insert from burning.
Description
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BACKGROUND OF THE INVENTION
This invention relates to pipe couplings and terminations and to the method of attaching a pipe terminating means on the end of a length of pipe that has a coating of a corrosion resistant material which is subject to damage by excessive heat that is generated when the terminating means is welded to the pipe end In the construction of pipelines for transporting petroleum, petroleum products and petrochemicals, standard lengths of pipe, usually 40 feet lengths, are welded together to form the line. The lengths of pipe for the line usually are lined or coated with a corrosion resistant plastic material to prevent corrosion of the steel pipe. The development of plastic materials that provide the required corrosion protection required in the petrochemical industry and that will suitably bond to the surface of the steel pipe is a high technology effort. The specially developed plastic materials are applied to the interior of the pipe surface in several coats at a coating plant. Each coat of plastic material is baked in a high temperature oven under controlled conditions to properly cure the plastic. The coated lengths of pipe then are shipped to the field where they are assembled to form a pipeline.
Various methods are practiced for joining the coated lengths of pipe. One common method is to weld the ends of adjacent pipes with a girth weld. The problem that is encountered in making the girth weld on plastic coated pipes is that the heat generated in making the weld burns and chars the internal plastic coating of the I
pipes, thereby destroying or seriously compromising the corrosion protection that is intended by the use of coated pipes.
Special types of joints and couplings have been developed to overcome the problem of burning the internal plastic coatings. One particularly successful type of welded joint is disclosed in US. patent 3,508,7~6 issued April 28, 1970 to NOW. Kessler et at and assigned to applicants' assignee. The method of making that welded joint involves butting together the belled ends of adjacent lengths of pipe over an internal metal sleeve which has an internal coating of baked plastic corrosion resistant material. The metal sleeve has heat retardant material such as asbestos around the mid portion of its outer surface and immediately below the butting ends of the pipes. Packing means, such as Wrings are located adjacent the tapered ends of the internal sleeve and provide seals between the sleeve and the inner surfaces of the pipes. A thermosetting corrosion resistant sealant in the plastic state is placed on the ends of the sleeve and within the ends of the pipe before insertion of the sleeve serves to further seal the space between the sleeve and pipes. Girth welds join the butting pipe ends.
The pipeline that is formed using the welded joint described above ultimately must couple or terminate into something else, such as a storage tank, a T-joint or Y-joint, etc. The last length of pipe before the termination usually is a length that is less than the standard 40 feet. Because the terminations are made in the field and because many of the terminating means are flanged joints, it is necessary that means and a method be available to welding crews to I
provide a flanged termination on the end of a pipeline without destroying the corrosion resistant quality of the lined pipe in the region of the termination.
It has been the practice in the pus t to cut a standard coated pipe to the desired length and then weld a pipe flange to the end of the cut pipe. This terminating length of pipe then is joined to the remainder of the pipeline by means of the welded joint described in the mentioned Kessler et at patent. Alternatively, the welding crew may carry with it a variety of different short lengths of pipe that have been internally coated with a high quality, baked coating in a coating plant. These short lengths sometimes are called "pup joints". A pipe terminating flange then is welded to the end of the pup joint and its other end is joined to the pipeline with the welded joint described in the cited patent.
lrl both the methods described above the high quality corrosion resistant internal coating on the pipe is burned and charred when the flange is welded to the end of the pipe. It has been the practice in the past to apply a patch of an air drying plastic coating material over the burned interior coating of the terminating length of pipe. This practice is not really satisfactory because the air drying plastic materials presently available do not provide a same type high quality corrosion protection as the baked coatings do. The air drying coating patch often does not bond securely to the pipe metal or to the baked coating on the pipe interior, and the air drying plastic often does not have the characteristic of being able to withstand some of the very highly corrosive environments that are encountered.
1~3t~
Other attempts to provide integrity of the internal coating on a terminating end of a pipeline involve the use of a flanged tube or insert of plastic material that is placed in the flanged end of the terminating length of pipe. A similar insert is placed within the end of the mating flange. The flanges of the plastic inserts are captured between the two pipe flanges when the joint is made up. Some means, such as a plastic liner, covers the plastic inserts in an attempt to provide the integral interior coating through the flanged joint. These plastic inserts have had limited success because they sometimes become damaged during makeup. On the other hand, if a strong durable plastic is used for the flanged insert, difficulty often is experienced in getting a good bond between it and an air drying patching material.
OBJECTS OF THE INVENTION
It is an object of this invention to provide apparatus and a method for producing a flanged termination for a pipe that maintains a high quality corrosion resistant plastic coating on the interior of the pipe end.
It is a further object of this invention to provide such a flanged termination that is easily and economically made in the field by a pipeline welding crew.
A further object of this invention is to provide a high quality, corrosion resistant pipe termination for a joint other than a flanged joint.
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RIFE DESCRIPTION OF THE DUNKS
The invention will be described by referring to the accom-paying drawings wherein:
Fig. 1 is a sectional view of a pipe termination that is made in accordance with the teachings of this invention;
Fig. is a sectional view of a sleeve insert and flange subassembly that is used in the termination of Fig. l; and Figs. 3-5 show subassemblies thaw include other types of pipe terminating means.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Ego. 1 illustrates a completed flanged termination on the end ox a section of pipe 10. Pipe 10 may be any type of line pipe from six inches up to 48 inches. Pipe 10 is internally coated with a continuous coating 11 of corrosion resistant plastic material that is applied and baked in a pipe coating plant. As an example, coating 11 may be any of the finlike, epoxy, or urethane base plastic materials known as Tube-Kote coatings that are applied at coating plants of AM Tuboscope, Inc., Houston, Texas. The coatings are applied in two or more coats that are applied by spraying a liquid plastic material throughout a heated pipe, or by flocking a resin powder within a heated pipe. Each coat of material is baked in an oven to cure the liquid plastic material or to melt and cure the plastic powder. The thicknesses of the plastic coating material illustrated in Fig. 1 are exaggerated for ease in illustration.
I
A commercially available annular weld neck flange 14 is butt welded to the right end of coated pipe section 10. As is standard practice, two or more circumferential welding beads 13 are made to join pipe 10 and the left end of flange 14. As is standard, a plurality of apertures 16 extend longitudinally through flange 14 and provide the means for receiving hots for holding opposing flanges together to provide a fluid tight joint. A metal sleeve insert 20 is disposed coccal within flange lo and is permanently secured thereto as by a weld 15 at the right end of the insert 20. Insert 20 is rounded off internally on its right end and has an external taper 22 machined on its left end. A narrow annular groove 24 is machined in the cylindrical body of sleeve insert 20 at the base of the tapered portion 22. A
packer means such as an elastomeric O-ring 28 is seated within annular groove 24. An elongated slot 30 is machined completely around the outer circumferential surface in the mid region of sleeve insert 20. Several layers or wraps of a heat retardant material such as asbestos tape are wrapped about the slot 30 so that the slot is substantially filled with the material.
A continuous coating of high quality corrosion resistant plastic material 40 that is applied and baked at a coating plant extends from the connecting face 42 of flange 14, through the interior surface of sleeve insert 20, over the tapered surface 22 of sleeve 20 and across the exterior surface of the sleeve approximately to the region of annular slot 30 in the mid region of the sleeve. A circumferential seal 44 of a corrosion resistant epoxy base plastic sealant material is :~l23~ 38 bonded to the coated surface of the tapered portion 22 of sleeve insert 20 and to the interior coating 11 of the pipe 10.
The multiple wraps of asbestos material 32 lie immediately below the butting ends of pipe 10 and flange 14 and serve to retard the transfer of heat to the interior surface of sleeve insert 20 while the weld is being made, thereby to prevent the plastic coating 40 on the inner surface of sleeve insert 20 from burning or charring during the welding operation. A similar arrangement is provided in the above mentioned patent 3,508,766.
Insert 20 and flange 14 are welded together and the coating 40 applied thereto at a fabricating and coating facility prior to shipment to the field where they are used by pipeline welding crews.
This permits a high quality coating material to be applied and cured, i.e., baked, under controlled conditions at a pipe coating plant. For example, in Fig. 2, sleeve insert 20 with its tapered end 22, groove 28, and slot 30, is machined from a piece of pipe that desirably is the same grade of steel as the pipe that is to be used in the pipe line.
Sleeve insert 20 is not coated at this time. Terminating flange 14 is placed over the right end of insert 20 until its innermost end 50 is located at approximately the mid region of annular slot 30. As illustrated in Fig. 2, the inner diameter of flange 14 desirably is substantially in contact with the outer diameter of sleeve insert 20.
Next, a circumferential weld 15 is made at the right end of insert 20 to secure it to flange 14. The connecting face 42 of flange 14 then is machined flat and the right inner corner 58 of sleeve insert 20 is 3(~9~
contoured to remove the sharp edge. A high quality corrosion resistant plastic material such as one of the Tube Kite materials mentioned above then is applied to the connecting face 42 of flange 14 and continuously through the interior of sleeve insert 20, over tapered end 22 and approximately to the beginning of slot 30. The subassembly with the uncured plastic applied thereto then is placed in an oven and baked under controlled conditions to cure the plastic, just as is done with the line pipe.
Subassemblies of Fig. 2 then are shipped to the field for use by welding crews. To apply the terminating subassembly of Fog. 2 to the end of a pipe 10, the crew dresses the right end of pipe 10 and makes a slight chamfer 62 at the outer end of the pipe. The crew then applies a thermosetting plastic sealant material in a band around the inner surface of the end of the pipe and to the tapered surface 22 and to the external surface up to slot 30 of insert 20. Care should be taken to assure that the sealant material is applied in both places in a continuous, holiday-free coating and is kept away from the immediate region of the end of the pipe 10 to make certain that it is not in a position to contaminate the weld that will be formed there. A suitable sealant material may be obtained from AM Tuboscope, Inc. under the name Thru-Kote sealant. O-ring 28 then is placed in slot 24 and asbestos tape is wrapped in slot 30. The tapered end of insert 20 then is forced within the open end of pipe 10. The subassembly is pushed inwardly until the right end of pipe 10 is approximately on-sixteenth inch from the innermost end 50 of flange 14. The flange and pipe end ~3C~
g now are positioned at the proper locations for making a girth weld there between. As is usual practice, a multiple number of weld passes will be required to complete the weld. Also as described in the above mentioned Kessler et at patent, the initial closing weld is performed in at least two steps to allow welding gases to escape through a vent hole and thereby prevent them from blowing out past the Oaring 28 and destroying the seal that is provided by the sealant material 44. By assuring that the end of pipe 10 and the innermost end of flange 14 are welded at a location immediately above the asbestos wrap 32, the transfer of heat from the weld to the inner plastic coating 40 is minimized and the coating is not burned. Accordingly, the high quality corrosion resistant characteristic of the baked coating material has not been compromised.
Figs. I and 2 illustrate a flange termination which is the presently preferred embodiment of our invention. It should be understood, however, that our method is not limited to this type of pipe terminating means. Figs. 3, 4 and 5 illustrate in simplified form other types of known pipe terminating means that may be assembled with a metal sleeve insert 20 and used in substantially the same manner as described above. For example, Fig. 3 illustrates the subassembly of a metal sleeve insert 20 and a Victaulic type pipe coupling. Fig. 4 illustrates the subassembly of metal sleeve insert 20 and a Gray lock type pipe coupling. Fig. 5 illustrates the subassembly of a mote! sleeve insert 20, and a male threaded coupling of standard type. In Figs. 3-5 it will be seen that the innermost ends of the -I Z3~ ~38 respective couplings all terminate at approximately the mid region of annular slot I just as illustrated in Figs. 1 and 2. The steps of internally coating the subassemblies of Figs. 3-5 is substantially the same as described above, and the insertion of the subassembly of Figs.
3-5 into the end of a pipe is substantially identical to the method described above.
While a preferred embodiment of the invention has been illustrated and described, it is to be understood that alterations and motif cations may be made to the described embodiment without departing from the scope of the present invention.
BACKGROUND OF THE INVENTION
This invention relates to pipe couplings and terminations and to the method of attaching a pipe terminating means on the end of a length of pipe that has a coating of a corrosion resistant material which is subject to damage by excessive heat that is generated when the terminating means is welded to the pipe end In the construction of pipelines for transporting petroleum, petroleum products and petrochemicals, standard lengths of pipe, usually 40 feet lengths, are welded together to form the line. The lengths of pipe for the line usually are lined or coated with a corrosion resistant plastic material to prevent corrosion of the steel pipe. The development of plastic materials that provide the required corrosion protection required in the petrochemical industry and that will suitably bond to the surface of the steel pipe is a high technology effort. The specially developed plastic materials are applied to the interior of the pipe surface in several coats at a coating plant. Each coat of plastic material is baked in a high temperature oven under controlled conditions to properly cure the plastic. The coated lengths of pipe then are shipped to the field where they are assembled to form a pipeline.
Various methods are practiced for joining the coated lengths of pipe. One common method is to weld the ends of adjacent pipes with a girth weld. The problem that is encountered in making the girth weld on plastic coated pipes is that the heat generated in making the weld burns and chars the internal plastic coating of the I
pipes, thereby destroying or seriously compromising the corrosion protection that is intended by the use of coated pipes.
Special types of joints and couplings have been developed to overcome the problem of burning the internal plastic coatings. One particularly successful type of welded joint is disclosed in US. patent 3,508,7~6 issued April 28, 1970 to NOW. Kessler et at and assigned to applicants' assignee. The method of making that welded joint involves butting together the belled ends of adjacent lengths of pipe over an internal metal sleeve which has an internal coating of baked plastic corrosion resistant material. The metal sleeve has heat retardant material such as asbestos around the mid portion of its outer surface and immediately below the butting ends of the pipes. Packing means, such as Wrings are located adjacent the tapered ends of the internal sleeve and provide seals between the sleeve and the inner surfaces of the pipes. A thermosetting corrosion resistant sealant in the plastic state is placed on the ends of the sleeve and within the ends of the pipe before insertion of the sleeve serves to further seal the space between the sleeve and pipes. Girth welds join the butting pipe ends.
The pipeline that is formed using the welded joint described above ultimately must couple or terminate into something else, such as a storage tank, a T-joint or Y-joint, etc. The last length of pipe before the termination usually is a length that is less than the standard 40 feet. Because the terminations are made in the field and because many of the terminating means are flanged joints, it is necessary that means and a method be available to welding crews to I
provide a flanged termination on the end of a pipeline without destroying the corrosion resistant quality of the lined pipe in the region of the termination.
It has been the practice in the pus t to cut a standard coated pipe to the desired length and then weld a pipe flange to the end of the cut pipe. This terminating length of pipe then is joined to the remainder of the pipeline by means of the welded joint described in the mentioned Kessler et at patent. Alternatively, the welding crew may carry with it a variety of different short lengths of pipe that have been internally coated with a high quality, baked coating in a coating plant. These short lengths sometimes are called "pup joints". A pipe terminating flange then is welded to the end of the pup joint and its other end is joined to the pipeline with the welded joint described in the cited patent.
lrl both the methods described above the high quality corrosion resistant internal coating on the pipe is burned and charred when the flange is welded to the end of the pipe. It has been the practice in the past to apply a patch of an air drying plastic coating material over the burned interior coating of the terminating length of pipe. This practice is not really satisfactory because the air drying plastic materials presently available do not provide a same type high quality corrosion protection as the baked coatings do. The air drying coating patch often does not bond securely to the pipe metal or to the baked coating on the pipe interior, and the air drying plastic often does not have the characteristic of being able to withstand some of the very highly corrosive environments that are encountered.
1~3t~
Other attempts to provide integrity of the internal coating on a terminating end of a pipeline involve the use of a flanged tube or insert of plastic material that is placed in the flanged end of the terminating length of pipe. A similar insert is placed within the end of the mating flange. The flanges of the plastic inserts are captured between the two pipe flanges when the joint is made up. Some means, such as a plastic liner, covers the plastic inserts in an attempt to provide the integral interior coating through the flanged joint. These plastic inserts have had limited success because they sometimes become damaged during makeup. On the other hand, if a strong durable plastic is used for the flanged insert, difficulty often is experienced in getting a good bond between it and an air drying patching material.
OBJECTS OF THE INVENTION
It is an object of this invention to provide apparatus and a method for producing a flanged termination for a pipe that maintains a high quality corrosion resistant plastic coating on the interior of the pipe end.
It is a further object of this invention to provide such a flanged termination that is easily and economically made in the field by a pipeline welding crew.
A further object of this invention is to provide a high quality, corrosion resistant pipe termination for a joint other than a flanged joint.
~3~Z~
RIFE DESCRIPTION OF THE DUNKS
The invention will be described by referring to the accom-paying drawings wherein:
Fig. 1 is a sectional view of a pipe termination that is made in accordance with the teachings of this invention;
Fig. is a sectional view of a sleeve insert and flange subassembly that is used in the termination of Fig. l; and Figs. 3-5 show subassemblies thaw include other types of pipe terminating means.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Ego. 1 illustrates a completed flanged termination on the end ox a section of pipe 10. Pipe 10 may be any type of line pipe from six inches up to 48 inches. Pipe 10 is internally coated with a continuous coating 11 of corrosion resistant plastic material that is applied and baked in a pipe coating plant. As an example, coating 11 may be any of the finlike, epoxy, or urethane base plastic materials known as Tube-Kote coatings that are applied at coating plants of AM Tuboscope, Inc., Houston, Texas. The coatings are applied in two or more coats that are applied by spraying a liquid plastic material throughout a heated pipe, or by flocking a resin powder within a heated pipe. Each coat of material is baked in an oven to cure the liquid plastic material or to melt and cure the plastic powder. The thicknesses of the plastic coating material illustrated in Fig. 1 are exaggerated for ease in illustration.
I
A commercially available annular weld neck flange 14 is butt welded to the right end of coated pipe section 10. As is standard practice, two or more circumferential welding beads 13 are made to join pipe 10 and the left end of flange 14. As is standard, a plurality of apertures 16 extend longitudinally through flange 14 and provide the means for receiving hots for holding opposing flanges together to provide a fluid tight joint. A metal sleeve insert 20 is disposed coccal within flange lo and is permanently secured thereto as by a weld 15 at the right end of the insert 20. Insert 20 is rounded off internally on its right end and has an external taper 22 machined on its left end. A narrow annular groove 24 is machined in the cylindrical body of sleeve insert 20 at the base of the tapered portion 22. A
packer means such as an elastomeric O-ring 28 is seated within annular groove 24. An elongated slot 30 is machined completely around the outer circumferential surface in the mid region of sleeve insert 20. Several layers or wraps of a heat retardant material such as asbestos tape are wrapped about the slot 30 so that the slot is substantially filled with the material.
A continuous coating of high quality corrosion resistant plastic material 40 that is applied and baked at a coating plant extends from the connecting face 42 of flange 14, through the interior surface of sleeve insert 20, over the tapered surface 22 of sleeve 20 and across the exterior surface of the sleeve approximately to the region of annular slot 30 in the mid region of the sleeve. A circumferential seal 44 of a corrosion resistant epoxy base plastic sealant material is :~l23~ 38 bonded to the coated surface of the tapered portion 22 of sleeve insert 20 and to the interior coating 11 of the pipe 10.
The multiple wraps of asbestos material 32 lie immediately below the butting ends of pipe 10 and flange 14 and serve to retard the transfer of heat to the interior surface of sleeve insert 20 while the weld is being made, thereby to prevent the plastic coating 40 on the inner surface of sleeve insert 20 from burning or charring during the welding operation. A similar arrangement is provided in the above mentioned patent 3,508,766.
Insert 20 and flange 14 are welded together and the coating 40 applied thereto at a fabricating and coating facility prior to shipment to the field where they are used by pipeline welding crews.
This permits a high quality coating material to be applied and cured, i.e., baked, under controlled conditions at a pipe coating plant. For example, in Fig. 2, sleeve insert 20 with its tapered end 22, groove 28, and slot 30, is machined from a piece of pipe that desirably is the same grade of steel as the pipe that is to be used in the pipe line.
Sleeve insert 20 is not coated at this time. Terminating flange 14 is placed over the right end of insert 20 until its innermost end 50 is located at approximately the mid region of annular slot 30. As illustrated in Fig. 2, the inner diameter of flange 14 desirably is substantially in contact with the outer diameter of sleeve insert 20.
Next, a circumferential weld 15 is made at the right end of insert 20 to secure it to flange 14. The connecting face 42 of flange 14 then is machined flat and the right inner corner 58 of sleeve insert 20 is 3(~9~
contoured to remove the sharp edge. A high quality corrosion resistant plastic material such as one of the Tube Kite materials mentioned above then is applied to the connecting face 42 of flange 14 and continuously through the interior of sleeve insert 20, over tapered end 22 and approximately to the beginning of slot 30. The subassembly with the uncured plastic applied thereto then is placed in an oven and baked under controlled conditions to cure the plastic, just as is done with the line pipe.
Subassemblies of Fig. 2 then are shipped to the field for use by welding crews. To apply the terminating subassembly of Fog. 2 to the end of a pipe 10, the crew dresses the right end of pipe 10 and makes a slight chamfer 62 at the outer end of the pipe. The crew then applies a thermosetting plastic sealant material in a band around the inner surface of the end of the pipe and to the tapered surface 22 and to the external surface up to slot 30 of insert 20. Care should be taken to assure that the sealant material is applied in both places in a continuous, holiday-free coating and is kept away from the immediate region of the end of the pipe 10 to make certain that it is not in a position to contaminate the weld that will be formed there. A suitable sealant material may be obtained from AM Tuboscope, Inc. under the name Thru-Kote sealant. O-ring 28 then is placed in slot 24 and asbestos tape is wrapped in slot 30. The tapered end of insert 20 then is forced within the open end of pipe 10. The subassembly is pushed inwardly until the right end of pipe 10 is approximately on-sixteenth inch from the innermost end 50 of flange 14. The flange and pipe end ~3C~
g now are positioned at the proper locations for making a girth weld there between. As is usual practice, a multiple number of weld passes will be required to complete the weld. Also as described in the above mentioned Kessler et at patent, the initial closing weld is performed in at least two steps to allow welding gases to escape through a vent hole and thereby prevent them from blowing out past the Oaring 28 and destroying the seal that is provided by the sealant material 44. By assuring that the end of pipe 10 and the innermost end of flange 14 are welded at a location immediately above the asbestos wrap 32, the transfer of heat from the weld to the inner plastic coating 40 is minimized and the coating is not burned. Accordingly, the high quality corrosion resistant characteristic of the baked coating material has not been compromised.
Figs. I and 2 illustrate a flange termination which is the presently preferred embodiment of our invention. It should be understood, however, that our method is not limited to this type of pipe terminating means. Figs. 3, 4 and 5 illustrate in simplified form other types of known pipe terminating means that may be assembled with a metal sleeve insert 20 and used in substantially the same manner as described above. For example, Fig. 3 illustrates the subassembly of a metal sleeve insert 20 and a Victaulic type pipe coupling. Fig. 4 illustrates the subassembly of metal sleeve insert 20 and a Gray lock type pipe coupling. Fig. 5 illustrates the subassembly of a mote! sleeve insert 20, and a male threaded coupling of standard type. In Figs. 3-5 it will be seen that the innermost ends of the -I Z3~ ~38 respective couplings all terminate at approximately the mid region of annular slot I just as illustrated in Figs. 1 and 2. The steps of internally coating the subassemblies of Figs. 3-5 is substantially the same as described above, and the insertion of the subassembly of Figs.
3-5 into the end of a pipe is substantially identical to the method described above.
While a preferred embodiment of the invention has been illustrated and described, it is to be understood that alterations and motif cations may be made to the described embodiment without departing from the scope of the present invention.
Claims (9)
1. A method of affixing terminating means on the end of a pipe that has an internal corrosion resistant coating of a material that may be damaged by excessive heat, comprising the steps positioning a pipe terminating member over one end region of a tubular metal insert sleeve that has an annular axially-extending slot in its external surface in a region intermediate its ends, aligning the innermost end of the terminating member to a position over said slot, securing the terminating means to said tubular metal insert, applying a coating of corrosion resistant material to the inner surface of said insert and to any portion of said terminating member that is likely to come into contact with a fluid product carried by the pipe, substantially filling said slot with heat retardant material, applying a sealant to said insert and/or to a region adjacent the end of the pipe, inserting said tubular metal insert within the open end of a pipe whose inner diameter is large enough to receive the insert until the end wall of the pipe substantially abutts said innermost end of the terminating member in the region immediately over said heat retardant means, and making a girth weld about said innermost end of the terminating member and the abutting pipe end to join the two together in a welded joint.
2. A method of fabricating a subassembly that is used in affixing terminating means on the end of a pipe that has an internal corrosion resistant coating of a material that may be damaged by excessive heat, comprising the steps positioning a pipe terminating member over one end region of a tubular metal insert sleeve that has an annular axially-extending slot in its external surface in a region intermediate its ends, aligning the innermost end of the terminating member to a position over said slot, securing the terminating means to said tubular metal insert, applying a coating of corrosion resistant plastic material to the inner surface of said insert and to any portion of said terminating member that is likely to be in contact with a fluid product carried by the pipe and curing said plastic material by baking the subassembly in an oven.
3. The method of welding a terminating flange to the end of a pipe what has an internal corrosion resistant coating of a plastic material that may be damaged by excessive heat generated during the welding, comprising the steps positioning an annular pipe terminating flange over one end region of a tubular metal insert that has an external annular slot intermediate its ends, positioning the innermost end of the terminating flange over said slot, welding the terminating flange to said tubular metal insert to form a subassembly thereof, applying a coating of corrosion resistant plastic material to the inner surface of said insert and to any surface of the flange that is likely to be in contact with a fluid product carried by the pipe, curing said plastic material by baking the coated insert and flange in an oven, substantially filling said external slot with a heat retardant material, providing sealant means adjacent the end of said insert opposite said flange, inserting said tubular metal insert within the open end of a pipe until the end wall of the pipe substantially abuts said innermost end of the terminating flange in the region immediately over said heat retardant material, and welding said pipe end and the innermost end with the terminating flange to provide a fluid tight joint there between.
4. The method of making a terminating subassembly that is used in welding a terminating flange to the end of a pipe that has an internal corrosion resistant coating of a plastic material that may be damaged by excessive heat generated during the welding, comprising the steps, positioning an annular pipe terminating flange over one end region of a tubular metal insert that has an external annular slot intermediate its ends, positioning the innermost end of the terminating flange over said slot, welding the terminating flange to said tubular metal insert to form a subassembly thereof, applying a coating of corrosion resistant plastic material to the inner surface of said insert and to any surface of the flange that is likely to be in contact with a fluid product carried by the pipe, and curing said plastic material by baking the above described subassembly in an oven.
5. A subassembly for use in providing a termination on the end of a pipe, comprising an annular metal terminating flange having a transverse connecting face at one end and an innermost end opposite thereto, a tubular metal sleeve having an annular axially-extending slot in its external surface, weldment means for securing one end of said sleeve within the annular portion of the terminating flange, said sleeve and said flange being constructed and arranged relative to each other so that the innermost end of the flange is over the slot in said sleeve.
6. The combination claimed in claim 5 an further including, a baked coating of corrosion resistant plastic material extending continuously throughout the internal surface of the sleeve and over said connecting face of the flange.
7. The combination claimed in claim 6 and further including, an annular groove in the external surface of said sleeve adjacent the end thereof opposite the weldment, said opposite end of the sleeve being tapered on its external surface, said baked coating extending from the internal surface of the sleeve continuously over said tapered opposite end and over said groove.
8. The combination claimed in claim 7 including, packer means in said groove, and heat retardant means in said slot.
9. The combination claimed in claim 8 wherein said sleeve is inserted within the end of a pipe with the pipe end substantially abutting said innermost end of the flange imniediately over said heat retardant means, and a girth weld securing the end of the pipe to the innermost end of the flange.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44533082A | 1982-11-29 | 1982-11-29 | |
| US445,330 | 1982-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230298A true CA1230298A (en) | 1987-12-15 |
Family
ID=23768500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000430458A Expired CA1230298A (en) | 1982-11-29 | 1983-06-15 | Pipe termination |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS59101284A (en) |
| CA (1) | CA1230298A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102848055B (en) * | 2012-09-27 | 2015-04-01 | 浙江中欣动力测控技术有限公司 | Method for reducing argon arc welding heat influence area |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148594Y2 (en) * | 1973-01-20 | 1976-11-24 |
-
1983
- 1983-06-15 CA CA000430458A patent/CA1230298A/en not_active Expired
- 1983-07-26 JP JP13665883A patent/JPS59101284A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0375266B2 (en) | 1991-11-29 |
| JPS59101284A (en) | 1984-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |