CA1131010A - Pipe coating system - Google Patents
Pipe coating systemInfo
- Publication number
- CA1131010A CA1131010A CA307,407A CA307407A CA1131010A CA 1131010 A CA1131010 A CA 1131010A CA 307407 A CA307407 A CA 307407A CA 1131010 A CA1131010 A CA 1131010A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- coating
- pipe sections
- pipe section
- station
- 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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Abstract
ABSTRACT OF THE DISCLOSURE
A pipe coating system and means comprising initially directing raw or unclean and uncoated pipe sections through a grit blasting station for cleaning of the outer periphery thereof, grinding the outer periphery of the cleaned pipe section for removal of any undesirable roughness present thereon subsequent to the cleaning operation, engaging the opposite ends, only, of the pipe section by contact with the inner periphery of the pipe, transporting the engaged pipe section by wheeled vehicles to and through a heating station and a subsequent coating station, propelling said pipe section and vehicles by means of canted roller means for moving the pipe section longitudinally through the heating and coating stations, simultaneously rotating the pipe section about the longitudinal axis thereof for facilitating the heating and coating opera-tions, transferring the pipe sections to a curing station, and depositing the coated and cured pipe section in a storage area for subsequent use as required.
A pipe coating system and means comprising initially directing raw or unclean and uncoated pipe sections through a grit blasting station for cleaning of the outer periphery thereof, grinding the outer periphery of the cleaned pipe section for removal of any undesirable roughness present thereon subsequent to the cleaning operation, engaging the opposite ends, only, of the pipe section by contact with the inner periphery of the pipe, transporting the engaged pipe section by wheeled vehicles to and through a heating station and a subsequent coating station, propelling said pipe section and vehicles by means of canted roller means for moving the pipe section longitudinally through the heating and coating stations, simultaneously rotating the pipe section about the longitudinal axis thereof for facilitating the heating and coating opera-tions, transferring the pipe sections to a curing station, and depositing the coated and cured pipe section in a storage area for subsequent use as required.
Description
:~3~
This invention relates to improvements in pipe coating method and means and more particularly, but not by way of limitation, to a method of coat-ing pipe in a continuous operation from raw pipe to coated and cured pipe.
The service life of steel pipes, whether disposed above the surface of the ground, buried in the ground~ extending through a body of water, or otherwise, is hampered or greatly lessened by the elements surrounding the pipe. For example, buried metallic pipes are subject to a great amount of external corrosion due to the electrolysis of the metal materials caused by the natural flow of electric current created by the reaction between the metallic surfaces and the chemicals of the soil or water surrounding the structure. The electric curren~ flowing from the metal into the adjacent soil and back to the metal makes the metallic structure an anode at the point where the current leaves the metallic structure~ and as the current flows from the pipe, minute particles of the metal are carried into the soil, causing a pitting of the wall of the pipe. Over a period of time the pipe frequently becomes severely damaged, and requires replacement. This is particularly disadvantageous with buried pipelines in that it is sometimes difficult to ascertain the exact position of the damaged pipe section or sections, and it is expensive and time consuming to expose the pipe for replacement thereof.
In addition, in the light of the present day shortages of materials, and particularly metallic materials, it is important that the useful and efficient service life of metallic pipelines be extended as long as possible.
In order to combat the damage to metallic pipelines from electro-lysis or other types of corrosion, many methods have been devised to protect the pipe from the surrounding elements. One common me~hod for reduction of electrolytic action is to provide a direct current flow from an outside source in an opposite direction to the flow of current from the pipe to render the pipe cathodic instead of anodic. This is commonly called cathodic protection, and substantially precludes loss of any minute metallic particles from the pipe. Another method for protecting the pipe comprises burying a magnesium or other metallic anode adjacent the pipe to be protected, with the pipe and anode being metallically connected to produce a galvanic cell for the elimination of corrosion.
External coating of the metallic pipes prior to bury-ing thereof is also widely utilized for protection of the pipe, both in buried str-uctures and in above the grourld structures.
The external coating is considered to be advantageous over other methods for pipe protection in that the coating usually provides a substantially universal protection for the pipe, and provides a longer lasting protection in a more economical manner. Many types of coating materials are in use today, many of which must be applied to the outer periphery of a clean, relatively smooth heated surface in order to achieve an efficient coating operation.
As a consequence~ it has been found more facile to coat individual pipe sections prior to the construction of a continuous pipeline which comprises a plurality of pipe sections connected or welded together in end-to-end relation. Not only is the coating opera-tion of these pipe sections somewhat difficult in that it is im-portant that the entire outer periphery of the pipe be completely coated, with no "holidays,~' but also the pretreatment of the pipe must be efficient, and is difficult to achieve since the mechani-cal nature of the handling of the pipe or pipe sections is unwieldy.
The present invention provides means for coating pipe sections in a substantially automated and continuous sequence from raw pipe sections to coated pipe sections and which comprises receiving means for initially receiving raw pipe sections in se-quential relationship, means for moving the raw pipe sections individually through grit blasting means for cleaning of the outer periphery thereof, means for moving the cleaned pipe sections individually through a grinding means, and means for moving the ~L3~
cleaned and ground pipe seckions individually khrough spray means for washing of khe outer periphery thereof and demag-netizing thereof, said last mentioned means supporting said individual pipe sections for movement through heating means and carrying said heated pipe sections through a coating station for application of coating material to the outer peri-phery thereof, all of said means being arranged in sequence for receiving the pipe sections in a continuous manner for providing said continuous sequence of operation.
Referring to the accompanying drawings:
Figure 1 is a schematic plan view of a pipe coating system embodying the invention.
Figure 2 is a front elevational view of a pipe coating system embodying the invention.
Pigur0 3 is a front elevational view of a furnace such as utilized in the heating station of a pipe coating system embodying the invention.
Figure 4 is a plan view of a push roller apparatus as utilized for moving pipe sections in a combined longitudinal and rota~ional movement in a pipe coating system embodying the invention.
Pigure 5 is a front elevational view of a spray appara-tus as ukilized in a pipe coating system embodying khe invention.
Figure 6 is a front elevational view of a washing apparatus as util-ized in a pipe coating system embodying the invention.
Referring to the drawings in detail, and particularly Figures 1 and
This invention relates to improvements in pipe coating method and means and more particularly, but not by way of limitation, to a method of coat-ing pipe in a continuous operation from raw pipe to coated and cured pipe.
The service life of steel pipes, whether disposed above the surface of the ground, buried in the ground~ extending through a body of water, or otherwise, is hampered or greatly lessened by the elements surrounding the pipe. For example, buried metallic pipes are subject to a great amount of external corrosion due to the electrolysis of the metal materials caused by the natural flow of electric current created by the reaction between the metallic surfaces and the chemicals of the soil or water surrounding the structure. The electric curren~ flowing from the metal into the adjacent soil and back to the metal makes the metallic structure an anode at the point where the current leaves the metallic structure~ and as the current flows from the pipe, minute particles of the metal are carried into the soil, causing a pitting of the wall of the pipe. Over a period of time the pipe frequently becomes severely damaged, and requires replacement. This is particularly disadvantageous with buried pipelines in that it is sometimes difficult to ascertain the exact position of the damaged pipe section or sections, and it is expensive and time consuming to expose the pipe for replacement thereof.
In addition, in the light of the present day shortages of materials, and particularly metallic materials, it is important that the useful and efficient service life of metallic pipelines be extended as long as possible.
In order to combat the damage to metallic pipelines from electro-lysis or other types of corrosion, many methods have been devised to protect the pipe from the surrounding elements. One common me~hod for reduction of electrolytic action is to provide a direct current flow from an outside source in an opposite direction to the flow of current from the pipe to render the pipe cathodic instead of anodic. This is commonly called cathodic protection, and substantially precludes loss of any minute metallic particles from the pipe. Another method for protecting the pipe comprises burying a magnesium or other metallic anode adjacent the pipe to be protected, with the pipe and anode being metallically connected to produce a galvanic cell for the elimination of corrosion.
External coating of the metallic pipes prior to bury-ing thereof is also widely utilized for protection of the pipe, both in buried str-uctures and in above the grourld structures.
The external coating is considered to be advantageous over other methods for pipe protection in that the coating usually provides a substantially universal protection for the pipe, and provides a longer lasting protection in a more economical manner. Many types of coating materials are in use today, many of which must be applied to the outer periphery of a clean, relatively smooth heated surface in order to achieve an efficient coating operation.
As a consequence~ it has been found more facile to coat individual pipe sections prior to the construction of a continuous pipeline which comprises a plurality of pipe sections connected or welded together in end-to-end relation. Not only is the coating opera-tion of these pipe sections somewhat difficult in that it is im-portant that the entire outer periphery of the pipe be completely coated, with no "holidays,~' but also the pretreatment of the pipe must be efficient, and is difficult to achieve since the mechani-cal nature of the handling of the pipe or pipe sections is unwieldy.
The present invention provides means for coating pipe sections in a substantially automated and continuous sequence from raw pipe sections to coated pipe sections and which comprises receiving means for initially receiving raw pipe sections in se-quential relationship, means for moving the raw pipe sections individually through grit blasting means for cleaning of the outer periphery thereof, means for moving the cleaned pipe sections individually through a grinding means, and means for moving the ~L3~
cleaned and ground pipe seckions individually khrough spray means for washing of khe outer periphery thereof and demag-netizing thereof, said last mentioned means supporting said individual pipe sections for movement through heating means and carrying said heated pipe sections through a coating station for application of coating material to the outer peri-phery thereof, all of said means being arranged in sequence for receiving the pipe sections in a continuous manner for providing said continuous sequence of operation.
Referring to the accompanying drawings:
Figure 1 is a schematic plan view of a pipe coating system embodying the invention.
Figure 2 is a front elevational view of a pipe coating system embodying the invention.
Pigur0 3 is a front elevational view of a furnace such as utilized in the heating station of a pipe coating system embodying the invention.
Figure 4 is a plan view of a push roller apparatus as utilized for moving pipe sections in a combined longitudinal and rota~ional movement in a pipe coating system embodying the invention.
Pigure 5 is a front elevational view of a spray appara-tus as ukilized in a pipe coating system embodying khe invention.
Figure 6 is a front elevational view of a washing apparatus as util-ized in a pipe coating system embodying the invention.
Referring to the drawings in detail, and particularly Figures 1 and
2~ reference character 10 generally indicates a pipe coating system comprising a continuous pipe treating system for initially receiving raw pipe sections 11 (indicated in broken lines in Figure 1) in sequential relationship and discharg-ing externc~ly coated pipe sections (not shown3 therefrom. Each raw pipe sec-tion 11 initially enters the system 10 at a receiving station 12, which receives the pipe sections in a manner whereby the pipe moves therethrough or therealong in a transverse direction with respect to the longitudinal axis of the pipe as indicated by the arrow 13. The receiving station 12 may be of any suitable type~ as for exa~ple the station may be proYided with ramp mec~s (not shown) disposed at an angle with respect to the horizontal and extending downwardly in a direction whereby gravity rolls the pipe sec~ion 11 from the entrance of the receiving station 12 toward a conveying section 14. Alternatively, suitable ro]lers (not shown) may be provided at the receiving station 12 for engagement with the outer periphery of the pipe section 11 in order to roll the pipe sec-tion or sections about the longitudinal axis thereo~ in a direction toward the conveying section 1~. In the event the rollers in the receiving station 12 are powered rollers, a suitable power plant 16 may be provided for activation of the rollers, or other equipment utilized in the pipe coating system 10, and said power plant 16 may be of any well known type9 such as diesel powered engines, hydraulic power plants~ electrical engines~ or the like, as desired.
It will be apparent that each pipe section 11 moves through the pipe coating sys~em 10 independently of every other pipe section 11, but it is pre~
ferable to move a plurality of pipe sections through the system at a time, in sequential arrangement wherein c~ll of the pipe sections in the system 10 at a given time will be receiving varying portions of the treatment for the external coating thereof.
~L3~
When a pipe section 11 is received at the conveying section 14, the direction of travel of the pipe 11 is altered whereby the pipe moves in a dir-ection parallel or in alignment with the longitudinal axis thereof~ as indicated by the arrow 15. It is preferable that the pipe section 11 be moved in this longitudinal direction at an increased rate of travel speed and by means of suitable spaced aligned rollers as indicated generally at 18. It is preferable that the rollers 18 be arranged in combinations of driving rollers and idler rollers, with all of the rollers being spaced with respect to one another where-by at least one portion of the pipe 11 will be constantly engaged by one of the driving rollers to assure a continuous and constant movement speed for the pipe section 11 in the longitudinal direction at and through the conveying section 14. In addition, it is preferable that each associated pair of rollers be pro-vided with its own motor, such as a hydraulic motor, but not limited thereto.
The rollers 18 carry the pipe section 11 through a grit blasting station 20 where the outer periphery of the pipe 11 is impinged with suitable grit material for thoroughly cleaning the outer surface of the pipe of rust, and the like, as is well known. It is preferable that the grit blasting station 20 include a pair of upstanding hoppers 22, or the like, for retaining a sup-ply of the grit material, and so arranged for directing the grit material agaYnst the entire outer periphery of the pipe section 11 ~th substantially great force for providing the grit blasting operation.
The rollers 18 move the pipe section through the grit blasting sec-tion 20 and a sufficient distance therebeyon~ for a complete blast cleaning of the entire length of the pipe section. When the pipe section has cleared the station 207 it is preferable that the speed of travel thereof be increased~
and the direction of travel of the pipe is again changed for moving the pipe 11 in a transverse direction with respect to its longitudinal axis, as indicat-ed by the arrow 21. It is also preferable to provide suitable powered roller means 22 for achieving this change of direction and increase in speed, with the _5_ 11~3~
roller means 22 preferably including a plurality of spaced drive rollers and at least one idler roller whereby not only is the direction of travel of the pipe altered, but also the increase in speed is achieved.
The blast cleaned pipe ll is now carried or conveyed to c~nd through a grinding section 24 which ma~ be of any suitable type, such as a grincling rack (not shown) ~hereby the entire outer periphery of the pipe 11 may~be treated as reguired for achieving the necessary finish therefor compa~ible wi~h the re-quirements of the coating material to be applied thereto. In the event the grinding operation indicates that an additional grit blasting treatment should be provided for the pipe section 1~ the pipe 11 may be returned or recycled through the grit blast station by a suitable reblast conveyor apparatus 26 which is disposed downstream of the grinding station 24, and returns the pipe 11 into the system 10 upstream of the grit blast station 20 whereby the pipe may be reblasted and again moved to and through the grinding station 24.
In the event the pipe 11 does not require any reblasting -treatment, the reblast conveyor apparatus 26 need not be utilized. In this event, the pipe 11 leaves the grinding station 24 and is carried onto suitable conveying vehicle means ~not shown) which again alter the direction of travel of the pipe 11 in order that the pipe will be once again moved in a longitudinal direction.
The conveying vehicle means pre~erably comprises a pair of wheeled vehicles or cars, one of which supports each end of the pipe section 11. The cars are pre-ferably of a four wheeled type~ with one axiall~ aligned pair of wheels being spaced apart a greater distance than the other pair of axially aligned wheels in order that the cars may be telescoped with respect to one anotherO For ex-ample, the rear wheels of a car supporting the trailing end of one pipe section may be spaced apart a greater distance than the front wheels of the car sup-porting the leading end of the next succeeding pipe section. In this manner, the forward car of the second pipe section may be moved into a telescopé~
position or cradled position with respect to the rear car of the first pipe ~3~
section in order that the adjacent end-to-end pipe sections may be disposed in relatively close or abutting relation for facilitating the o~erall pipe coating operation. In addition, it is preferable that the wheels of the cars be of the type for engaging and rolling along mutually parallel rail means 28 and 30 which are disposed in alignment with the pipe treating stations through which the cleaned and ground pipe section 11 is to be conveyed~ as will be hereinafter set forth. The rail means 28 and 30 are preferably particularly ara~ s arranged for use in the coating~me~k~ 10 as will be hereinafter set forth in detail.
Each end of the pipe section 11 is supported by an individual or independent car (not shown) as hereinbefore set forth. In addition, each car is provided with suitable plug means (not shown), or the like, for engagement with the inner periphery of each open end of t;he pipe whereby the pipe is sup-ported in a suspended position between the two cars. Furthermore, each plug means is arranged for free rotation whereby the pipe section ma~ be rotated about its own longitudinal axis while being engaged by the plug mec~ns.
The pipe section :11 is conveyed in a direction paral]el or in align-ment with its own longitudinal axis as the cars move along the rails 28 and 30 in a direction as indicated by the arrow 32. The pipe is thus carried to a water spray station 34~ and subsequently to and through a heating station 36.
lt is important at this stage of the treating operation that the pipe section 11 not only move longitudinally, but also that the pipe rotate about its own longitudinal axis. In orderto accomplish this longitudinal movement for the pipe 11, a plurality of push rollers, generall~ indicated at 38~ are installed in the proximity of the rail means 28 and 30 for engaging the outer periphery of the pipe section prior to entering of the spray station 34. ~ suitable support apparatus 40 for the push roller means 38 is shown in Figure 4. The push roller means 38 preferably comprises a plurality of axially aligned ro~
tatableoverhead rollers having the transverse planes thereof canted, or at an L3~
angle with respect to the direction of travel of the pipe section passing under the rollers. The rollers are power driven in any well known or suitable man-ner, as by the power plant l6, and the engagement of the outer periphery of the rollers 38 with the outer periphery of the pipe section ll moves the pipe in the longitudinal direction indicated by the arrow 32g which causes the sup-port cars (not shown) to roll along the rails 28 and 30 in said direction.
Simultaneously~ the rotational activation of the plug means (not shown) en-gaged with the ends of the pipe section causes the pipe section to rotate about its own longitudinal axis. The plug means engaging the opposite ends of the pipe section are preferably provided with suitable clutch means (not shown) and adjustable bearing means (nok shown) for compensating for any ec-centricity, or "out of alignment," of the pipe axis whereby the pipe will be balanced on the respective support cars during the rotation of the pipe. It ~llpbei~appareht that the engagement of the canted rollers with the outer periphery of the pipe ll will assist the rotation of the pipe sections as they move through the push roller station 38. In addition, the internal end plug means preferably remains in engagement with the opposite ends of the pipe from the initial engagement thereof subsequent to the grinding operation un-til the entire coating and curing operation has been completed. It is also to be noted that whereas it may be preferable that the support cars not be powered~ if desired each car may be independently powered in any suitable or well known manner for movement thereof along the rail means 28 and 30.
A spray washing apparatus generally indicated at ~12 is shown in Figure 6 and comprises a substantially arch shaped support frame 44 having suitable inwardly directed spray nozzles or jets (not shown) carried thereby.
The nozzles preferably extend in directions toward each other and the liquid spray7 such as water, emerging from each nozzle or jet is at a relatively high pressure and impinges against the outer periphery of the pipe ll with swffi-cient force for efficiently washing the pipe. The pipe moves through the
It will be apparent that each pipe section 11 moves through the pipe coating sys~em 10 independently of every other pipe section 11, but it is pre~
ferable to move a plurality of pipe sections through the system at a time, in sequential arrangement wherein c~ll of the pipe sections in the system 10 at a given time will be receiving varying portions of the treatment for the external coating thereof.
~L3~
When a pipe section 11 is received at the conveying section 14, the direction of travel of the pipe 11 is altered whereby the pipe moves in a dir-ection parallel or in alignment with the longitudinal axis thereof~ as indicated by the arrow 15. It is preferable that the pipe section 11 be moved in this longitudinal direction at an increased rate of travel speed and by means of suitable spaced aligned rollers as indicated generally at 18. It is preferable that the rollers 18 be arranged in combinations of driving rollers and idler rollers, with all of the rollers being spaced with respect to one another where-by at least one portion of the pipe 11 will be constantly engaged by one of the driving rollers to assure a continuous and constant movement speed for the pipe section 11 in the longitudinal direction at and through the conveying section 14. In addition, it is preferable that each associated pair of rollers be pro-vided with its own motor, such as a hydraulic motor, but not limited thereto.
The rollers 18 carry the pipe section 11 through a grit blasting station 20 where the outer periphery of the pipe 11 is impinged with suitable grit material for thoroughly cleaning the outer surface of the pipe of rust, and the like, as is well known. It is preferable that the grit blasting station 20 include a pair of upstanding hoppers 22, or the like, for retaining a sup-ply of the grit material, and so arranged for directing the grit material agaYnst the entire outer periphery of the pipe section 11 ~th substantially great force for providing the grit blasting operation.
The rollers 18 move the pipe section through the grit blasting sec-tion 20 and a sufficient distance therebeyon~ for a complete blast cleaning of the entire length of the pipe section. When the pipe section has cleared the station 207 it is preferable that the speed of travel thereof be increased~
and the direction of travel of the pipe is again changed for moving the pipe 11 in a transverse direction with respect to its longitudinal axis, as indicat-ed by the arrow 21. It is also preferable to provide suitable powered roller means 22 for achieving this change of direction and increase in speed, with the _5_ 11~3~
roller means 22 preferably including a plurality of spaced drive rollers and at least one idler roller whereby not only is the direction of travel of the pipe altered, but also the increase in speed is achieved.
The blast cleaned pipe ll is now carried or conveyed to c~nd through a grinding section 24 which ma~ be of any suitable type, such as a grincling rack (not shown) ~hereby the entire outer periphery of the pipe 11 may~be treated as reguired for achieving the necessary finish therefor compa~ible wi~h the re-quirements of the coating material to be applied thereto. In the event the grinding operation indicates that an additional grit blasting treatment should be provided for the pipe section 1~ the pipe 11 may be returned or recycled through the grit blast station by a suitable reblast conveyor apparatus 26 which is disposed downstream of the grinding station 24, and returns the pipe 11 into the system 10 upstream of the grit blast station 20 whereby the pipe may be reblasted and again moved to and through the grinding station 24.
In the event the pipe 11 does not require any reblasting -treatment, the reblast conveyor apparatus 26 need not be utilized. In this event, the pipe 11 leaves the grinding station 24 and is carried onto suitable conveying vehicle means ~not shown) which again alter the direction of travel of the pipe 11 in order that the pipe will be once again moved in a longitudinal direction.
The conveying vehicle means pre~erably comprises a pair of wheeled vehicles or cars, one of which supports each end of the pipe section 11. The cars are pre-ferably of a four wheeled type~ with one axiall~ aligned pair of wheels being spaced apart a greater distance than the other pair of axially aligned wheels in order that the cars may be telescoped with respect to one anotherO For ex-ample, the rear wheels of a car supporting the trailing end of one pipe section may be spaced apart a greater distance than the front wheels of the car sup-porting the leading end of the next succeeding pipe section. In this manner, the forward car of the second pipe section may be moved into a telescopé~
position or cradled position with respect to the rear car of the first pipe ~3~
section in order that the adjacent end-to-end pipe sections may be disposed in relatively close or abutting relation for facilitating the o~erall pipe coating operation. In addition, it is preferable that the wheels of the cars be of the type for engaging and rolling along mutually parallel rail means 28 and 30 which are disposed in alignment with the pipe treating stations through which the cleaned and ground pipe section 11 is to be conveyed~ as will be hereinafter set forth. The rail means 28 and 30 are preferably particularly ara~ s arranged for use in the coating~me~k~ 10 as will be hereinafter set forth in detail.
Each end of the pipe section 11 is supported by an individual or independent car (not shown) as hereinbefore set forth. In addition, each car is provided with suitable plug means (not shown), or the like, for engagement with the inner periphery of each open end of t;he pipe whereby the pipe is sup-ported in a suspended position between the two cars. Furthermore, each plug means is arranged for free rotation whereby the pipe section ma~ be rotated about its own longitudinal axis while being engaged by the plug mec~ns.
The pipe section :11 is conveyed in a direction paral]el or in align-ment with its own longitudinal axis as the cars move along the rails 28 and 30 in a direction as indicated by the arrow 32. The pipe is thus carried to a water spray station 34~ and subsequently to and through a heating station 36.
lt is important at this stage of the treating operation that the pipe section 11 not only move longitudinally, but also that the pipe rotate about its own longitudinal axis. In orderto accomplish this longitudinal movement for the pipe 11, a plurality of push rollers, generall~ indicated at 38~ are installed in the proximity of the rail means 28 and 30 for engaging the outer periphery of the pipe section prior to entering of the spray station 34. ~ suitable support apparatus 40 for the push roller means 38 is shown in Figure 4. The push roller means 38 preferably comprises a plurality of axially aligned ro~
tatableoverhead rollers having the transverse planes thereof canted, or at an L3~
angle with respect to the direction of travel of the pipe section passing under the rollers. The rollers are power driven in any well known or suitable man-ner, as by the power plant l6, and the engagement of the outer periphery of the rollers 38 with the outer periphery of the pipe section ll moves the pipe in the longitudinal direction indicated by the arrow 32g which causes the sup-port cars (not shown) to roll along the rails 28 and 30 in said direction.
Simultaneously~ the rotational activation of the plug means (not shown) en-gaged with the ends of the pipe section causes the pipe section to rotate about its own longitudinal axis. The plug means engaging the opposite ends of the pipe section are preferably provided with suitable clutch means (not shown) and adjustable bearing means (nok shown) for compensating for any ec-centricity, or "out of alignment," of the pipe axis whereby the pipe will be balanced on the respective support cars during the rotation of the pipe. It ~llpbei~appareht that the engagement of the canted rollers with the outer periphery of the pipe ll will assist the rotation of the pipe sections as they move through the push roller station 38. In addition, the internal end plug means preferably remains in engagement with the opposite ends of the pipe from the initial engagement thereof subsequent to the grinding operation un-til the entire coating and curing operation has been completed. It is also to be noted that whereas it may be preferable that the support cars not be powered~ if desired each car may be independently powered in any suitable or well known manner for movement thereof along the rail means 28 and 30.
A spray washing apparatus generally indicated at ~12 is shown in Figure 6 and comprises a substantially arch shaped support frame 44 having suitable inwardly directed spray nozzles or jets (not shown) carried thereby.
The nozzles preferably extend in directions toward each other and the liquid spray7 such as water, emerging from each nozzle or jet is at a relatively high pressure and impinges against the outer periphery of the pipe ll with swffi-cient force for efficiently washing the pipe. The pipe moves through the
3~
water spray in the combined longitudinal and rotational movement whereby the entire outer periphery of the pipe receives a quantity of the liquid impinged thereagainst. The ]iquid or water spray not only washes away any foreign particles which may be present on the outer periphery of the pipe 11, but also demagnetizes the pipe for impro~ing the overall pipe coating operation.
As the pipe 11 emerges from the water spray station 34, it moves in-to the heating station 36, still moving in a combined longitudinal and rota-tional manner. It is to be noted that after the pipe 11 leaves the water spray station 34, the outer periphery of the pipe is never again engaged or contacted until the entire coating operation has been completed. The pushing forces imparted to the pipe section by the push roller means 38 is sufficient for keeping the pipe sections movirg longitudinally through the entire re-maining portions of the pipe coating operation since successive pipe sections moving through the system are disposed in substantiaL end-to-end relation, with the respective support cars for each pipe section being telescopically arranged with respect to the support cars of the preceding pipe section~ as hereinbefore set forth. Thus~ as the particular pipe section in engagement with the push roller means 38 is pushed in a longitudinally for~ard direction, the pushed pipe section, in turn, pushes the pipe section or sections ahead of it in the pipe coating process for maintaining a continuous forward move-ment for the pipe sections throughout the entire coating operation.
With regard to the telescopic arrangement of the conveying cars which facilitates the end to-end engagement of adjacent or in-line pipe sec-tions for moving all of the pipes through the coating operation as hereinbe-fore set forth, it is to be noted that the rails 28 and 30 must be so designed and arranged to accomodate the forward and rear pairs of wheels for each car since each pair of wheels are spaced apart a different distance. ~ccordingly, each rail 28 and 30 comprises a pair of slightly spaced rai:Ls whereby a totaL
of four rails (not shown) extend in mutually parallel relation throughout the _9_ 1~3~
length required for the pipe coating operation subsequent to the grinding oper-ation at the grindin~ station 24. Thus~ the wheels of each car having the least spacing therebetween will ride on the inboard rails~ and the wheels of each car having the greatest spacing therebetween will ride on the outboard rails.
The heating station 36 as shown herein preferably comprises a furnace generally indicated at 50 in Figure 3 and as particularly set forth in my co-pending application~ and whereby the pipe 11 may be passed therethrough in a longitudinal directionO The furnace 50 comprises a substantially arch shaped support or frame work 52 having a suitable flue means 53, or the like, carried thereby for assuring a proper circulatiorl of air for an efficient operation of the furnace. In addition~ it is preferable to provide two banks of burners 54 and 56 on each side of the frame 52, with the burners 54 and 56 extending in-wardly in a direction toward the pipe 11 passing through the furnace 50. The banks of burners on one side of the frame 52 are preferably disposed at sub-stantially three o~clock with respect to the transverse circular configuration I of the pipe 11~ ~nd the burners on the opposite side of the frame 52 are pre-ferably disposed ~t substantially nine o'clock~ but not limited thereto.
It is also desirable to provide a fire wall 58 at each end of the furnace 50 for containing the heat within the furnace, and each fire wall 58 is provided with a substantially centrally disposed opening 60 thereih~for pas-sage of the pipe 11 therethrough. In addition~ of course, the opening 60 is provided with a hiatus (not shown) in the lower portion thereof for passage of the conveyi,ng cars and associated components through the firewalls 5~ and fur-nace 50 as the pipe 11 is conveyed therethrough. A pair of inwardly directed floor plates 62 and 64 may also be provided on the inwardly directed sidewalls of the frame 52 in order to substantially reduce heat loss and protect the sur-rounding area from the extreme temperatures normally present ,in the furnace 50. Each burner of the banks 54 and 56 may be operably connected with any suitable control means (not shown) whereby the burners are deactivated as a ~3~
conveying car approaches the respective burner, and reactivated when the con-veying car moves therebeyond. Thusg heat is applied only to the pipe section 11 itself, and the intense or extreme direct heat from the burners 54 and 56 is not directed to the end plug mechanism supporting the opposite ends of the pipe section 11.
Of course, the speed of longitudinal and rotational movement of the pipe section 11 is selected in accordance with ~he optimum time required for retaining the pipe section within the furnace 50 for achieving the desired temperature for the pipe as required for an optimum coating operation, as is w-~ll known. The push rollers 38 preferably comprise a plurality of individual rollers (not shown) supported by the framework structure ~0 whereby the verti-cal position of the rollers may be adjusted or altered in accordance with the outer diameter of the pipe 11 being treated ~n the coating system 10~ and whereby the canted ar~le of each of the rollers may be adjusted in order to vary the speed of forward mo~ement of the pipe lli~moving through the system 10. For example, as shown in Figure ~ the framework 40 comprises a main sup-port structure 66 spanning the rail means 28 and 30 and supporting a pair of spaced mutually parallel hori7ontally extending roller support frames 68 and 70. The frames 68 and 70 are preferably cantilevered forwardly from the main support 66 and each frame 68 and 70 is provided with at least one roller car-rying member 72 having a push roller (not shown) suitably journalled thereon.
The frames 68 and 70 are preferably overhead frames whereby the rollers are supported in a mar~er for engaging the upper portion of the outer periphery of the pipe 11, but not limited thereto. The push rol]er assembly 38 is more fully set forth in detail in my copending application.
When the pipe 11 has been sufficiently heated at the heating station 36, the hot pipe emerging from the downstream end thereof travels toward a coating station 74. It is preferable to interpose a suitable fire screen 76 between the heating station 36 and the coating station 7~ for protection of the ~3~
coating station from the heat present in the furnace 50. It is preferable that the coating station be of a type for utilization with a powdered coating material, but not limited thereto. This type of coating station is normally referred to as a fluidi7ing bed~ and the preferable types of powdered coating material in the pipe coating industry at the present time usually require the application of a barrier coating material to the outer periphery of the pipe prior to the application of the coating powder. The barrier coa~ g material is usually in a liquid s~ate~ and in order to piovide for this step in the coat-ing system, it is preferable to interpose a suitable barrier spray st~tion 78 substantially immediately downstream from the fire screen 76. The barrier spray station 78 may be of any suitable type and as particularly shown in Fig-ure 5, preferably comprises a substantially arch shaped support structure 80 whereby the pipe section 11 may be easily moved through the station 78. Suit-able nozzles~ jets~ or the li1~e~ (not shown) are provided on the inwardly directed sides of the structure 80 for directing the liquid coating material onto the hot outer periphery of the longitudinally and rotationally moving pipe 11 passing through the station 78. In this manner a thorough and complete coating of the outer periphery of the pipe 11 with the barrier coating material is achieved. Of course, it is preferable to provide suitable apertured walls 82 at the opposite ends of the frame or structure 80 for retaining the liquid material within the station^J78. In some instances~ it may be possible to re-cover the liquid coating material from any overspraying for reuse in the bar-rier coating operation.
When the pipe 11 leaves the barrier coating station 78, it is moved into the fluidi~e~ bed portion 84 of the coating station 74. The coating station 7~ is particularly set forth in detail in my copending application~
and includes a plurality of gun batteries (not shown) substantially complete-ly surrounding the outer periphery of the pipe, and spaced therefrom whereby the optimum quantity of powder is sprayed directly onto the outer periphery of the properly heated pipe tl. In addition, suitable chambers (not shown)are provided in the coating statio~ 7~ for catching substantially all of the overspray for recovery of the powdered material. It is usually important thak a suitable filter (nvt shown) be provided covering the open portions of the recovery c~amber (not shown) through which the powder is entering the chamber to assure that the reclaimed or recovered powder is clean and in reusable con-dition as the powder accumulates therein. Suitable conduit means (not show~) is provided in communication with the recovery chamber or cham'bers for moving the reclaimed powder into an overhead storage chamber which is preferably pro-vided in the proximity of the main powder storage chamber. In this manner,new po'~der and reclaimed powder may be simultaneously directed to the outer periphery of the pipe for an e-fficient coating thereof. It is to be noted that the combined lGngitudinal and rotational movement of the pipe 11 passing through the coating station 74 assures a thorough and efficient coating'of the entire outer periphery of the pipe 11.
When the coated pipe 11 emerges from the coating station 74, it is moved into a suitable curing station 86 where the pipe 11 may be handled in the usual manner for providing the required curing for the particular coating material which has 'been utili~ed in the system 10. In some instances, it is merely ~ecessary to air dr~ and cool the coated pipe for curing of the coating material. In this case, the coated pipe section is transferred from the con-veying cars onto a slanted curing board (not sho~m) which is particularly de-signed and constructed for engaging only the normally bevelled outer periphery of the extreme ends of the pipe section, and the pipe section rolls by gravity from the initial position at the curing station 86 to the desired end storage position therefor. Of course, if additional handling is required for the cur-ing operation, the curing station 86 may be properly arranged for achieving the curing~ all of which is well known in the industry.
In order to transfer a coated pipe section 11 from the conveying -t3-~L3~
cars onto the curing station 86, it is preferable that the end plug apparatus (not shown) engaging the opposite ends of the pipe section be activated in a manner for lowering the pipe 11 from its elevated position on the cars to a lowered position in engagement with the support members (not shown) of the curing station 86. When the pipe has been properly deposited at the curing station, both the end plugs may ~hen be removed from engagement with the ends of the pipe~ and the conveying cars are then free for reuse în the coating system 10.
ln order to reuse the conveying cars, it is preferable to provide second rail means 88 and 90 generally similar to the rail means 28 and 3~ with said second rail means 88 and 90 extending substantially parallel to the rail means 28 and 30 throughout the entire length thereof. ~he two sets of rail means 28-30 and 88-90 are in communication with each other at the opposite ends thereof by suitable tra~sversely extending or cross over rails (not shown) whereby the conveying cars may be easily moved from one set of rails to the other. When the cars have been moved from the rail means 28 and 30 to the rail means 88 and 90, the cars may be pulled, or otherwise moved along the rail means 88 and 90 to a position in the proximity of the downstream side of the grinding station 24 for receiving another pipe section 11 for transportation thereof through the remaining steps in the coating operation as hereinbefore set forth.
~ rom the foregoing it will be apparent that the present invention provides a novel method and means for receiving raw pipe sections in sequent-ial order and coating the external surfaces or outer periphery thereof in a substantially completely automated manner. Each pipe section to be coated is moved through the coating system sequentially whereby a plurality of pipe sec-tions are coated simultaneously at ~arying or differing progressional steps during the coating operation. The pipe section is initially received and pass-ed through a grit blasting station for removing undesirable conditions from ~3~
the outer periphery of the pipe. The pipe is then moved to a grinding stationwherein the outer periphery of the pipe is further prepared as required for an efficient coating thereof. The blasted and ground pipe section is then moved to suitable conveying vehicles or cars which carry the pipe throughout the remaining portions of the coating operation. The pipe is moved into a push roller station where forward movement is imparted thereto, with each successive pipe section being in substantial end-to-end abutment with the adjacent pipe sections whereby a driving force applied to one pipe section is transmitted throughout the forwardly disposed pipe section or sections. The pipe sections are washed for cleaning and demagnetizing thereof~ and are heat-ed as required for the coating material being used. A two stage coating op-eration mayb~performed on the heated pipe, comprising a liquid barrier coat-ing applied by a spraying operation and a powdered coating material applied by a fluidizing process, with any overspray of the coating materials being retrievable and recyclable. The coated pipe is then transferred to a curing station and to an ultimate storage area, and the conveying vehicles are re-turned to a proper position in the overall system for receiving another pipe section in order to repeat the process.
water spray in the combined longitudinal and rotational movement whereby the entire outer periphery of the pipe receives a quantity of the liquid impinged thereagainst. The ]iquid or water spray not only washes away any foreign particles which may be present on the outer periphery of the pipe 11, but also demagnetizes the pipe for impro~ing the overall pipe coating operation.
As the pipe 11 emerges from the water spray station 34, it moves in-to the heating station 36, still moving in a combined longitudinal and rota-tional manner. It is to be noted that after the pipe 11 leaves the water spray station 34, the outer periphery of the pipe is never again engaged or contacted until the entire coating operation has been completed. The pushing forces imparted to the pipe section by the push roller means 38 is sufficient for keeping the pipe sections movirg longitudinally through the entire re-maining portions of the pipe coating operation since successive pipe sections moving through the system are disposed in substantiaL end-to-end relation, with the respective support cars for each pipe section being telescopically arranged with respect to the support cars of the preceding pipe section~ as hereinbefore set forth. Thus~ as the particular pipe section in engagement with the push roller means 38 is pushed in a longitudinally for~ard direction, the pushed pipe section, in turn, pushes the pipe section or sections ahead of it in the pipe coating process for maintaining a continuous forward move-ment for the pipe sections throughout the entire coating operation.
With regard to the telescopic arrangement of the conveying cars which facilitates the end to-end engagement of adjacent or in-line pipe sec-tions for moving all of the pipes through the coating operation as hereinbe-fore set forth, it is to be noted that the rails 28 and 30 must be so designed and arranged to accomodate the forward and rear pairs of wheels for each car since each pair of wheels are spaced apart a different distance. ~ccordingly, each rail 28 and 30 comprises a pair of slightly spaced rai:Ls whereby a totaL
of four rails (not shown) extend in mutually parallel relation throughout the _9_ 1~3~
length required for the pipe coating operation subsequent to the grinding oper-ation at the grindin~ station 24. Thus~ the wheels of each car having the least spacing therebetween will ride on the inboard rails~ and the wheels of each car having the greatest spacing therebetween will ride on the outboard rails.
The heating station 36 as shown herein preferably comprises a furnace generally indicated at 50 in Figure 3 and as particularly set forth in my co-pending application~ and whereby the pipe 11 may be passed therethrough in a longitudinal directionO The furnace 50 comprises a substantially arch shaped support or frame work 52 having a suitable flue means 53, or the like, carried thereby for assuring a proper circulatiorl of air for an efficient operation of the furnace. In addition~ it is preferable to provide two banks of burners 54 and 56 on each side of the frame 52, with the burners 54 and 56 extending in-wardly in a direction toward the pipe 11 passing through the furnace 50. The banks of burners on one side of the frame 52 are preferably disposed at sub-stantially three o~clock with respect to the transverse circular configuration I of the pipe 11~ ~nd the burners on the opposite side of the frame 52 are pre-ferably disposed ~t substantially nine o'clock~ but not limited thereto.
It is also desirable to provide a fire wall 58 at each end of the furnace 50 for containing the heat within the furnace, and each fire wall 58 is provided with a substantially centrally disposed opening 60 thereih~for pas-sage of the pipe 11 therethrough. In addition~ of course, the opening 60 is provided with a hiatus (not shown) in the lower portion thereof for passage of the conveyi,ng cars and associated components through the firewalls 5~ and fur-nace 50 as the pipe 11 is conveyed therethrough. A pair of inwardly directed floor plates 62 and 64 may also be provided on the inwardly directed sidewalls of the frame 52 in order to substantially reduce heat loss and protect the sur-rounding area from the extreme temperatures normally present ,in the furnace 50. Each burner of the banks 54 and 56 may be operably connected with any suitable control means (not shown) whereby the burners are deactivated as a ~3~
conveying car approaches the respective burner, and reactivated when the con-veying car moves therebeyond. Thusg heat is applied only to the pipe section 11 itself, and the intense or extreme direct heat from the burners 54 and 56 is not directed to the end plug mechanism supporting the opposite ends of the pipe section 11.
Of course, the speed of longitudinal and rotational movement of the pipe section 11 is selected in accordance with ~he optimum time required for retaining the pipe section within the furnace 50 for achieving the desired temperature for the pipe as required for an optimum coating operation, as is w-~ll known. The push rollers 38 preferably comprise a plurality of individual rollers (not shown) supported by the framework structure ~0 whereby the verti-cal position of the rollers may be adjusted or altered in accordance with the outer diameter of the pipe 11 being treated ~n the coating system 10~ and whereby the canted ar~le of each of the rollers may be adjusted in order to vary the speed of forward mo~ement of the pipe lli~moving through the system 10. For example, as shown in Figure ~ the framework 40 comprises a main sup-port structure 66 spanning the rail means 28 and 30 and supporting a pair of spaced mutually parallel hori7ontally extending roller support frames 68 and 70. The frames 68 and 70 are preferably cantilevered forwardly from the main support 66 and each frame 68 and 70 is provided with at least one roller car-rying member 72 having a push roller (not shown) suitably journalled thereon.
The frames 68 and 70 are preferably overhead frames whereby the rollers are supported in a mar~er for engaging the upper portion of the outer periphery of the pipe 11, but not limited thereto. The push rol]er assembly 38 is more fully set forth in detail in my copending application.
When the pipe 11 has been sufficiently heated at the heating station 36, the hot pipe emerging from the downstream end thereof travels toward a coating station 74. It is preferable to interpose a suitable fire screen 76 between the heating station 36 and the coating station 7~ for protection of the ~3~
coating station from the heat present in the furnace 50. It is preferable that the coating station be of a type for utilization with a powdered coating material, but not limited thereto. This type of coating station is normally referred to as a fluidi7ing bed~ and the preferable types of powdered coating material in the pipe coating industry at the present time usually require the application of a barrier coating material to the outer periphery of the pipe prior to the application of the coating powder. The barrier coa~ g material is usually in a liquid s~ate~ and in order to piovide for this step in the coat-ing system, it is preferable to interpose a suitable barrier spray st~tion 78 substantially immediately downstream from the fire screen 76. The barrier spray station 78 may be of any suitable type and as particularly shown in Fig-ure 5, preferably comprises a substantially arch shaped support structure 80 whereby the pipe section 11 may be easily moved through the station 78. Suit-able nozzles~ jets~ or the li1~e~ (not shown) are provided on the inwardly directed sides of the structure 80 for directing the liquid coating material onto the hot outer periphery of the longitudinally and rotationally moving pipe 11 passing through the station 78. In this manner a thorough and complete coating of the outer periphery of the pipe 11 with the barrier coating material is achieved. Of course, it is preferable to provide suitable apertured walls 82 at the opposite ends of the frame or structure 80 for retaining the liquid material within the station^J78. In some instances~ it may be possible to re-cover the liquid coating material from any overspraying for reuse in the bar-rier coating operation.
When the pipe 11 leaves the barrier coating station 78, it is moved into the fluidi~e~ bed portion 84 of the coating station 74. The coating station 7~ is particularly set forth in detail in my copending application~
and includes a plurality of gun batteries (not shown) substantially complete-ly surrounding the outer periphery of the pipe, and spaced therefrom whereby the optimum quantity of powder is sprayed directly onto the outer periphery of the properly heated pipe tl. In addition, suitable chambers (not shown)are provided in the coating statio~ 7~ for catching substantially all of the overspray for recovery of the powdered material. It is usually important thak a suitable filter (nvt shown) be provided covering the open portions of the recovery c~amber (not shown) through which the powder is entering the chamber to assure that the reclaimed or recovered powder is clean and in reusable con-dition as the powder accumulates therein. Suitable conduit means (not show~) is provided in communication with the recovery chamber or cham'bers for moving the reclaimed powder into an overhead storage chamber which is preferably pro-vided in the proximity of the main powder storage chamber. In this manner,new po'~der and reclaimed powder may be simultaneously directed to the outer periphery of the pipe for an e-fficient coating thereof. It is to be noted that the combined lGngitudinal and rotational movement of the pipe 11 passing through the coating station 74 assures a thorough and efficient coating'of the entire outer periphery of the pipe 11.
When the coated pipe 11 emerges from the coating station 74, it is moved into a suitable curing station 86 where the pipe 11 may be handled in the usual manner for providing the required curing for the particular coating material which has 'been utili~ed in the system 10. In some instances, it is merely ~ecessary to air dr~ and cool the coated pipe for curing of the coating material. In this case, the coated pipe section is transferred from the con-veying cars onto a slanted curing board (not sho~m) which is particularly de-signed and constructed for engaging only the normally bevelled outer periphery of the extreme ends of the pipe section, and the pipe section rolls by gravity from the initial position at the curing station 86 to the desired end storage position therefor. Of course, if additional handling is required for the cur-ing operation, the curing station 86 may be properly arranged for achieving the curing~ all of which is well known in the industry.
In order to transfer a coated pipe section 11 from the conveying -t3-~L3~
cars onto the curing station 86, it is preferable that the end plug apparatus (not shown) engaging the opposite ends of the pipe section be activated in a manner for lowering the pipe 11 from its elevated position on the cars to a lowered position in engagement with the support members (not shown) of the curing station 86. When the pipe has been properly deposited at the curing station, both the end plugs may ~hen be removed from engagement with the ends of the pipe~ and the conveying cars are then free for reuse în the coating system 10.
ln order to reuse the conveying cars, it is preferable to provide second rail means 88 and 90 generally similar to the rail means 28 and 3~ with said second rail means 88 and 90 extending substantially parallel to the rail means 28 and 30 throughout the entire length thereof. ~he two sets of rail means 28-30 and 88-90 are in communication with each other at the opposite ends thereof by suitable tra~sversely extending or cross over rails (not shown) whereby the conveying cars may be easily moved from one set of rails to the other. When the cars have been moved from the rail means 28 and 30 to the rail means 88 and 90, the cars may be pulled, or otherwise moved along the rail means 88 and 90 to a position in the proximity of the downstream side of the grinding station 24 for receiving another pipe section 11 for transportation thereof through the remaining steps in the coating operation as hereinbefore set forth.
~ rom the foregoing it will be apparent that the present invention provides a novel method and means for receiving raw pipe sections in sequent-ial order and coating the external surfaces or outer periphery thereof in a substantially completely automated manner. Each pipe section to be coated is moved through the coating system sequentially whereby a plurality of pipe sec-tions are coated simultaneously at ~arying or differing progressional steps during the coating operation. The pipe section is initially received and pass-ed through a grit blasting station for removing undesirable conditions from ~3~
the outer periphery of the pipe. The pipe is then moved to a grinding stationwherein the outer periphery of the pipe is further prepared as required for an efficient coating thereof. The blasted and ground pipe section is then moved to suitable conveying vehicles or cars which carry the pipe throughout the remaining portions of the coating operation. The pipe is moved into a push roller station where forward movement is imparted thereto, with each successive pipe section being in substantial end-to-end abutment with the adjacent pipe sections whereby a driving force applied to one pipe section is transmitted throughout the forwardly disposed pipe section or sections. The pipe sections are washed for cleaning and demagnetizing thereof~ and are heat-ed as required for the coating material being used. A two stage coating op-eration mayb~performed on the heated pipe, comprising a liquid barrier coat-ing applied by a spraying operation and a powdered coating material applied by a fluidizing process, with any overspray of the coating materials being retrievable and recyclable. The coated pipe is then transferred to a curing station and to an ultimate storage area, and the conveying vehicles are re-turned to a proper position in the overall system for receiving another pipe section in order to repeat the process.
Claims (4)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Means for coating pipe sections in a substantially automated and continuous sequence from raw pipe sections to coated pipe sections and which comprises receiving means for initially receiving raw pipe sections in sequential relationship, means for moving the raw pipe sections individually through grit blasting means for cleaning of the outer periphery thereof, means for moving the cleaned pipe sections individually through a grinding means, and means for moving the cleaned and ground pipe sections individually through spray means for washing of the outer periphery thereof and de-magnetizing thereof, said last mentioned means supporting said individual pipe sections for movement through heating means and carrying said heated pipe sections through a coating station for application of coating material to the outer periphery thereof, all of said means being arranged in sequence for receiving the pipe sections in a continuous manner for providing said continuous sequence of operation.
2. Means for coating pipe sections as set forth in claim 1 wherein said last mentioned means supports said individual pipe sections in a manner providing for independent rotation thereof about the respective longitudinal axis thereof.
3. Means for coating pipe sections as set forth in claim 2 wherein the last mentioned means carries the individual pipe section in a longitudinal direction while simultaneously rotating the said pipe section about its own longitudinal axis.
4. Means for coating pipe sections as set forth in claim 1 wherein all of the moving means and supporting means cooperate for moving a plurality of pipe sections in a continuous sequential movement throughout the coating operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US81591077A | 1977-07-15 | 1977-07-15 | |
| US815,910 | 1977-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131010A true CA1131010A (en) | 1982-09-07 |
Family
ID=25219162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA307,407A Expired CA1131010A (en) | 1977-07-15 | 1978-07-14 | Pipe coating system |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1131010A (en) |
| IT (1) | IT7850277A0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990009542A1 (en) * | 1989-02-09 | 1990-08-23 | Tubemakers Of Australia Limited | Method of corrosion protection at pipe junctions |
-
1978
- 1978-07-13 IT IT7850277A patent/IT7850277A0/en unknown
- 1978-07-14 CA CA307,407A patent/CA1131010A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990009542A1 (en) * | 1989-02-09 | 1990-08-23 | Tubemakers Of Australia Limited | Method of corrosion protection at pipe junctions |
| US5274897A (en) * | 1989-02-09 | 1994-01-04 | Gienek Mieszelewicz | Method of corrosion protection at pipe junctions |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7850277A0 (en) | 1978-07-13 |
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