US3600736A - Pressurized pipeline pigs - Google Patents
Pressurized pipeline pigs Download PDFInfo
- Publication number
- US3600736A US3600736A US816181A US3600736DA US3600736A US 3600736 A US3600736 A US 3600736A US 816181 A US816181 A US 816181A US 3600736D A US3600736D A US 3600736DA US 3600736 A US3600736 A US 3600736A
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- Prior art keywords
- pipe
- plug
- pig
- drying chamber
- fluid
- Prior art date
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- Expired - Lifetime
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- 241000282887 Suidae Species 0.000 title abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 114
- 238000001035 drying Methods 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 239000012858 resilient material Substances 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims description 36
- 238000011144 upstream manufacturing Methods 0.000 claims description 32
- 230000008878 coupling Effects 0.000 claims description 23
- 238000010168 coupling process Methods 0.000 claims description 23
- 238000005859 coupling reaction Methods 0.000 claims description 23
- 238000007789 sealing Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
- B08B9/0553—Cylindrically shaped pigs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
- B08B9/0558—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles with additional jet means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
- F16L55/28—Constructional aspects
- F16L55/30—Constructional aspects of the propulsion means, e.g. towed by cables
- F16L55/38—Constructional aspects of the propulsion means, e.g. towed by cables driven by fluid pressure
Definitions
- This invention relates to apparatus commonly known as pigs for removing liquids and solids from pipe lines.
- the pig includes at least two transverse stoppers or plugs spaced apart and coupled together to form a moving drying chamber between the plugs.
- the pig is adapted to be propelled through the pipe by a fluid pressure gradient.
- Each stopper has an external peripheral surface provided by a resilient material fonning a sealing but slidable engagement with the surrounding cylindrical interior wall of the pipe.
- a resilient material fonning a sealing but slidable engagement with the surrounding cylindrical interior wall of the pipe.
- the front stopper pushes the fluids downstream and any remaining liquids within the moving drying chamber, which is formed by the inner cylindrical wall of the pipe between the moving stoppers, become siphoned out by a siphon tube outwardly from the drying chamber in the Patented Aug. 24, 1971 2 Sheets-Sheet 1 James C. Smith 8 Marvin 0. Powers INVENTORS BY fa /r. 2,4
- This invention relates to pressurized pigs propelled through a pipe line by a fluid pressure gradient.
- the pig includes two transverse end plugs sealingly and slidably engaging the inner cylindrical wall of the pipe as the pig travels through the pipe.
- the front plug of the pig clears the bulk of the liquids in the pipe, while both plugs form a drying chamber in the space contained between the end plugs and confined by the inner cylindrical wall of the pipe.
- the drying chamber clears any liquids which may have passed through the front plug and/or which may exist on the inner cylindrical wall of the pipe.
- the drying' chamber is operated by the pressure gradient established by the plugs as the pig is propelled through the pipe line.
- FIG. 1 is a view in longitudinal cross section of a preferred embodiment of a pig in accordance with this invention
- FIG. 2 is a view taken on line 2-2 in FIG. 1;
- FIG. 3 is a front view taken on line 3-3 in FIG. 1.
- the pig 14 Since the pig 14 is especially useful for clearing liquids from pipe lines, it is illustrated as being inside a pipe or tube 10 having an inner cylindrical wall 12. The pig is typically propelled through the pipe line by a pressurized gas. At any instant of time, pig 14 separates pipe 10 into an upstream pipe section 16 and a downstream pipe section 18 assuming that the pig moves from right to left as viewed in FIG. 1. It is the object of pig 14 to clear the liquids, typically water 20 and solid debris 21 from the downstream section 18 through an outlet (not shown) further down the pipe line. It will be apparent that a long pipe line is not usually stretched in a straight line but on the contrary has many turns both in lateral and vertical directions.
- the pig to continuously maintain a sealing but slidable engagement with the inner cylindrical wall 12 of tube 10.
- Such engagement is afforded by at least two end stoppers or plugs, generally designated as 22, 22'.
- end stoppers or plugs generally designated as 22, 22'.
- more than two such stoppers may be provided if desired. Since the stoppers can be conveniently made substantially identical to each other, symmetrically disposed parts in stopper 22 are designated with the same numerals as their corresponding parts in plug 22 but with primes added thereto.
- Each stopper or plug may be thought of as providing a movable wall or piston against which a fluid pressure is exerted.
- Plug 22 can be built of commercially available parts to provide a deformable wall 24 positioned in sealing and sliding engagement with the inner cylindrical wall 12 of pipe 10.
- Wall 24 can be the peripheral circumferential wall of a tubeless tire 26 mounted on a suitable rim 28 to the center of which is welded a centering plate 30.
- Assembly 32 includes a hollow coupling shaft 34 rigidly fastened, as by welding, to two inner end plates 36,36.
- the rim 28 is sandwiched between inner plate 36 and an outer end plate 38.
- Plates 36 and 38 are secured to each other by long bolts 40 extending through apertures in the center plate 30.
- a fluid inlet port 50 which may be provided by a small tube 52, which is secured to outer end plate 38, allows fluid pressure to communicate between the upstream section 16 and a drying chamber or section 60. The fluid communication is established to chamber 60 through tube 54, hollow shaft 34 and outlet tubes 56 radially extending from hollow shaft 34.
- the pressure in the upstream section 16 be designated as P
- the pressure in the drying chamber 60 defined by the inner end plates 36, 36 and the inner cylindrical wall 12, as P
- the pressure in the downstream section 18 as P where P is greater than P and P is greater than P due to the restrictive orifices.
- the flow of the gases from the upstream section 16 into the drying section 60 is indicated by single-headed arrows 62.
- the fluids from the drying chamber 60 are removed by a fluid pickup line or siphon tube 64 which extends from the lowermost portion of the cylindrical wall 12 to a port 66 formed by an opening in the cylindrical wall of hollow shaft 34.
- Communicating with port 66 and a discharge head 68 secured to end plate 38' is an elongated tube 70 passing through the centers of plates 36', 38 and 30'.
- the fluid from discharge head 68 is channeled through a plurality of discharge pipes 73 (FIG. 3) having oriented nozzles 72 to produce effects to be later described.
- the path of the fluid flow from the drying chamber 60 to the downstream section 18 is indicated by double-headed arrows 74.
- a plurality of reinforcing ribs are provided to strengthen the mechanical coupling assembly 32.
- the siphon line 64 is preferably made of a resilient tube 81 coupled to an L-shaped pipe section 82. Siphon line 64 establishes fluid communication with a swivel chamber 84 formed within a cylindrical swivel assembly, generally designated as 86. Swivel 86 is rotatably mounted on the hollow shaft 34 and maintained in axial alignment by a pair of radially extending shoulders 88, 90. The swivel assembly 86 rotatably rests on the outer cylindrical wall of hollow shaft 34 on two annular end fingers 92, 94.
- the swivel 86 is provided with a weight 100, such as lead bolted by bolts 102 to the outer wall of the swivel.
- a weight 100 such as lead bolted by bolts 102 to the outer wall of the swivel.
- pig 14 is inserted in the pipe line in a conventional manner.
- a suitable driving gas is employed to establish the desired pressure gradient to propel the pig through the pipe line.
- the gas becomes exerted against end plate 38.
- the pressure inside the tubeless tires 26, 26 is adjusted so that the pressure difference across the tire walls is not sufficient to unseat the tires from their respective rims 28, 28.
- the relatively small pressure difference across the wall of each tire aids in flattening out the deformable wall 24 to provide even a better sliding seal between wall 24 and the inner cylindrical wall 12 of tube 10.
- the driving gas from the upstream section 16 passes through tubes 52, 54, hollow shaft 34, outlets 56 and into the drying chamber 60.
- the gases from drying chamber 60 are allowed to escape through the siphon line 64, the swivel chamber 84, port 66, liquid return line 70, discharge head 68 and nozzles 72 into the downstream section 18 of pipe 10.
- the upstream pressure P sustains a pressure drop and is greater than the interim pressure P in the drying chamber 60, and the pressure P is in turn greater than the pressure P in the downstream section 18.
- This pressure drop or gradient provides the propelling force for pig 14 and front plug 22' to clear the liquid 20 to a downstream outlet.
- Any liquids 20 which bypass the sliding seal wall 24' and enter into the drying chamber 60 to form the liquid pool 21' are picked up by the liquid pickup line 64.
- the liquid pickup is based on the pressure P in chamber 60 being greater than the pressure P, in the downstream section 18.
- a suitable check valve 71 is provided in line 70 to prevent liquids from entering line 70 and hence the drying section 60.
- the inner cylindrical wall 12 in the upstream section 16 becomes substantially dry as a result of a single traverse of pig 14 through pipe 10.
- the orientation of the nozzles 72 is such as to cause a stirring effect on whatever solid debris 21 that may have gathered in the water pool 20. This stirring effect facilitates the removal of the solids by the downstream flow of the water 20.
- the discharge under pressure of the gases and water through nozzles 72 also causes a rotation of the pig l4 inside the pipe 10 thereby equalizing the wear on the deformable sliding walls 24, 24.
- the hollow shaft 34 rotates inside the swivel to assure that the gas and water pickup line 64 is always directed downwardly so as to pick up any liquids in the pool 21' in the drying chamber 60 even at the lowermost portion of pipe 10.
- a pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
- each plug being adapted to restrain fluid flow thereacross
- each plug having a deformable wall formed of resilient material and defining an external peripheral surface
- said surface being expandable in response to fluid pressure in said plug to provide a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
- coupling means adapted to securely fasten said plugs to each other and to maintain said plugs in longitudinal spaced apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs;
- said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug
- said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and
- ing means include a siphon tube
- siphon tube orientation means for orienting said siphon tube in a downwardly direction.
- siphon tube orientation means include a swivel rotatably coupled to said coupling means.
- each plug includes a fluid pressure expandable tire mounted on a rim.
- a pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
- each plug being adapted to restrain fluid flow thereacross
- each plug having a wall defining an external peripheral surface
- said wall providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
- a drying chamber is defined by the inner volume of said pipe confined between said plugs; said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug,
- said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and
- liquid pickup means responsive to said fluid pressure gradient between said drying chamber and said downstream section for removing liquids from said drying chamber.
- a pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
- each plug having a deformable wall formed of resilient material and defining an external peripheral surface
- said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
- coupling means adapted to securely fasten said plugs to each other and to maintain said plugs in longitudinal spaced apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs;
- said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug
- said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and
- said coupling means including liquid pickup means comprising a swivel rotatably mounted on said coupling means and a siphon tube coupled to said swivel for picking up liquids from said drying chamber and expelling them into said downstream section.
- a pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
- said plug having a deformable wall formed of resilient material and defining an external peripheral surface
- said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
- said plug when inserted into said pipe divides said pipe into a downstream section in front of said plug
- fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said downstream section, whereby said fluid pressure gradient is established for propelling said pig through said pipe;
- said fluid communication means including liquid pickup means comprising a swivel rotatably mounted on said fluid communication means and a siphon tube coupled to said swivel for picking up fluids from said upstream section and expelling them into said downstream section.
- a pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
- said plug having a deformable wall formed of resilient material and defining an external peripheral surface
- said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
- said plug when inserted into said pipe divides said pipe into a downstream section in front of said plug
- fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said downstream section, whereby said fluid pressure gradient is established for propelling said pig through said pipe;
- said fluid communication means including liquid pickup means comprising a siphon tube for picking up fluids from said upstream section and expelling them into said downstream section;
- siphon tube orientation means for orienting said siphon tube in a downwardly direction.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning In General (AREA)
Abstract
This invention relates to apparatus commonly known as pigs for removing liquids and solids from pipe lines. The pig includes at least two transverse stoppers or plugs spaced apart and coupled together to form a moving drying chamber between the plugs. The pig is adapted to be propelled through the pipe by a fluid pressure gradient. Each stopper has an external peripheral surface provided by a resilient material forming a sealing but slidable engagement with the surrounding cylindrical interior wall of the pipe. Under the influence of the pressure gradient the front stopper pushes the fluids downstream and any remaining liquids within the moving drying chamber, which is formed by the inner cylindrical wall of the pipe between the moving stoppers, become siphoned out by a siphon tube outwardly from the drying chamber in the direction of fluid flow.
Description
United States Patent (72] inventors James Calley Smith Beaumont, Ten; Marvin Dewy Powers, 6060 Skyllne Drive, Apt. 14, Houston. Tex. 77027 [211 App]. No. 816.181
[22] Filed Apr. l0 I969 [45! Putented Aug. 24, 1971 U73 1 Assignee said Powers, by said Smith [54] PRESSURIZED PIPELINE PIGS 2,332,984 10/1943 Braciteen 2,447,966 8/1948 Stephens Primary Examiner-Edward L. Roberts Attorney-Michael P. Breston ABSTRACT: This invention relates to apparatus commonly known as pigs for removing liquids and solids from pipe lines. The pig includes at least two transverse stoppers or plugs spaced apart and coupled together to form a moving drying chamber between the plugs. The pig is adapted to be propelled through the pipe by a fluid pressure gradient. Each stopper has an external peripheral surface provided by a resilient material fonning a sealing but slidable engagement with the surrounding cylindrical interior wall of the pipe. Under the influence of the pressure gradient the front stopper pushes the fluids downstream and any remaining liquids within the moving drying chamber, which is formed by the inner cylindrical wall of the pipe between the moving stoppers, become siphoned out by a siphon tube outwardly from the drying chamber in the Patented Aug. 24, 1971 2 Sheets-Sheet 1 James C. Smith 8 Marvin 0. Powers INVENTORS BY fa /r. 2,4
ATTORNEY Patented Aug. 24, 1911 3,600,736
2 Sheets-Sheet z I James C. Smith 8 Marvin 0. Powers INVENTORS ATTORNEY PRESSURIZED PIPELINE PIGS BACKGROUND OF THE INVENTION Various pipe line liquid removers and cleaners are known in the art. One such widely used pig includes a pair of rubber cups mounted at each end of a center shaft. The pressure gradient between the upstream section of the pipe and the downstream section of the pipe on either side of the pig forces outwardly the inside lip of each cup into sealing but slidable engagement with the inner cylindrical wall of the pipe. Such pigs may be used for segregating products transported by the pipe line, clearing liquids and, with the aid of suitable cleaning attachments, cleaning the inner wall of the pipe line.
It has been found that while such prior art tools may be adequate for cleaning purposes they are relatively inefficient for clearing and removing liquids from pipe lines. For example, it is common practice to test new pipe lines under hydrostatic pressure to detect leaks and weak joints. After the hydrostatic test, it is necessary of course to clear the pipe line of the water prior to feeding hydrocarbon fluids such as combustible gases, oils, gasolines, etc. If such products are sent through an improperly dehydrated pipe line, the products are likely to be rejected by the customer or consumer for containing an excessive amount of moisture. As a result, pipe line operators spend considerable time and money in making certain that substantially all of the water in the pipe line has been cleared, prior to allowing the pipe line to carry hydrocarbon products. But even when great care is exercised in clearing the water from the pipe line with conventional pigs, there is still no assurance that substantially all of the water was cleared out. Pockets of water frequently remain in spaced-apart sections of the pipe line and their existence may only become revealed when the hydrocarbon products are analyzed for their moisture content.
SUMMARY OF THE INVENTION This invention relates to pressurized pigs propelled through a pipe line by a fluid pressure gradient. The pig includes two transverse end plugs sealingly and slidably engaging the inner cylindrical wall of the pipe as the pig travels through the pipe. The front plug of the pig clears the bulk of the liquids in the pipe, while both plugs form a drying chamber in the space contained between the end plugs and confined by the inner cylindrical wall of the pipe. The drying chamber clears any liquids which may have passed through the front plug and/or which may exist on the inner cylindrical wall of the pipe. The drying' chamber is operated by the pressure gradient established by the plugs as the pig is propelled through the pipe line.
Accordingly, it is a main object of this invention to provide for use in pipe lines new and improved pigs which are especially effective in clearing liquids from pipe lines.
It is another object of this invention to provide a new and improved pipe line liquid remover which clears the pipe line of liquids and at the same time dries the inner cylindrical wall of the pipe line.
Yet, it is another object of this invention to provide a new and improved pipe line liquid remover which is relatively inexpensive to manufacture and which clears the pipe lines of liquids in a relatively short time and in a very economic manner.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in longitudinal cross section of a preferred embodiment of a pig in accordance with this invention;
FIG. 2 is a view taken on line 2-2 in FIG. 1; and
FIG. 3 is a front view taken on line 3-3 in FIG. 1.
The invention will be illustrated by reference to a specific presently preferred embodiment as shown in the figures where the same numerals designate identical parts and where primed numerals identify symmetrical parts in the end plugs.
Since the pig 14 is especially useful for clearing liquids from pipe lines, it is illustrated as being inside a pipe or tube 10 having an inner cylindrical wall 12. The pig is typically propelled through the pipe line by a pressurized gas. At any instant of time, pig 14 separates pipe 10 into an upstream pipe section 16 and a downstream pipe section 18 assuming that the pig moves from right to left as viewed in FIG. 1. It is the object of pig 14 to clear the liquids, typically water 20 and solid debris 21 from the downstream section 18 through an outlet (not shown) further down the pipe line. It will be apparent that a long pipe line is not usually stretched in a straight line but on the contrary has many turns both in lateral and vertical directions. Consequently, it is desirable for the pig to continuously maintain a sealing but slidable engagement with the inner cylindrical wall 12 of tube 10. Such engagement is afforded by at least two end stoppers or plugs, generally designated as 22, 22'. Of course, more than two such stoppers may be provided if desired. Since the stoppers can be conveniently made substantially identical to each other, symmetrically disposed parts in stopper 22 are designated with the same numerals as their corresponding parts in plug 22 but with primes added thereto.
Each stopper or plug may be thought of as providing a movable wall or piston against which a fluid pressure is exerted. Plug 22 can be built of commercially available parts to provide a deformable wall 24 positioned in sealing and sliding engagement with the inner cylindrical wall 12 of pipe 10. Wall 24 can be the peripheral circumferential wall of a tubeless tire 26 mounted on a suitable rim 28 to the center of which is welded a centering plate 30.
To maintain the end plugs 22, 22' in longitudinally spaced, parallel alignment there is provided a mechanical coupling assembly, generally designated as 32. Assembly 32 includes a hollow coupling shaft 34 rigidly fastened, as by welding, to two inner end plates 36,36. The rim 28 is sandwiched between inner plate 36 and an outer end plate 38. Plates 36 and 38 are secured to each other by long bolts 40 extending through apertures in the center plate 30. A fluid inlet port 50 which may be provided by a small tube 52, which is secured to outer end plate 38, allows fluid pressure to communicate between the upstream section 16 and a drying chamber or section 60. The fluid communication is established to chamber 60 through tube 54, hollow shaft 34 and outlet tubes 56 radially extending from hollow shaft 34. Let the pressure in the upstream section 16 be designated as P,, the pressure in the drying chamber 60, defined by the inner end plates 36, 36 and the inner cylindrical wall 12, as P and the pressure in the downstream section 18 as P where P is greater than P and P is greater than P due to the restrictive orifices. The flow of the gases from the upstream section 16 into the drying section 60 is indicated by single-headed arrows 62.
The fluids from the drying chamber 60 are removed by a fluid pickup line or siphon tube 64 which extends from the lowermost portion of the cylindrical wall 12 to a port 66 formed by an opening in the cylindrical wall of hollow shaft 34. Communicating with port 66 and a discharge head 68 secured to end plate 38' is an elongated tube 70 passing through the centers of plates 36', 38 and 30'. The fluid from discharge head 68 is channeled through a plurality of discharge pipes 73 (FIG. 3) having oriented nozzles 72 to produce effects to be later described. The path of the fluid flow from the drying chamber 60 to the downstream section 18 is indicated by double-headed arrows 74. A plurality of reinforcing ribs are provided to strengthen the mechanical coupling assembly 32.
The siphon line 64 is preferably made of a resilient tube 81 coupled to an L-shaped pipe section 82. Siphon line 64 establishes fluid communication with a swivel chamber 84 formed within a cylindrical swivel assembly, generally designated as 86. Swivel 86 is rotatably mounted on the hollow shaft 34 and maintained in axial alignment by a pair of radially extending shoulders 88, 90. The swivel assembly 86 rotatably rests on the outer cylindrical wall of hollow shaft 34 on two annular end fingers 92, 94. To assure that the siphon line 64 will always extend to the lowermost position of drying chamber 60 and intowhatever liquid pool 21 that may exist in the drying chamber 60, the swivel 86 is provided with a weight 100, such as lead bolted by bolts 102 to the outer wall of the swivel. Thus, regardless of the orientation of pig 14 in the pipe 10, the siphon line 64 will point downwardly, as desired.
In operation, pig 14 is inserted in the pipe line in a conventional manner. A suitable driving gas is employed to establish the desired pressure gradient to propel the pig through the pipe line. The gas becomes exerted against end plate 38. The pressure inside the tubeless tires 26, 26 is adjusted so that the pressure difference across the tire walls is not sufficient to unseat the tires from their respective rims 28, 28. The relatively small pressure difference across the wall of each tire aids in flattening out the deformable wall 24 to provide even a better sliding seal between wall 24 and the inner cylindrical wall 12 of tube 10. The driving gas from the upstream section 16 passes through tubes 52, 54, hollow shaft 34, outlets 56 and into the drying chamber 60. The gases from drying chamber 60 are allowed to escape through the siphon line 64, the swivel chamber 84, port 66, liquid return line 70, discharge head 68 and nozzles 72 into the downstream section 18 of pipe 10. Thus, the upstream pressure P sustains a pressure drop and is greater than the interim pressure P in the drying chamber 60, and the pressure P is in turn greater than the pressure P in the downstream section 18. This pressure drop or gradient provides the propelling force for pig 14 and front plug 22' to clear the liquid 20 to a downstream outlet. Any liquids 20 which bypass the sliding seal wall 24' and enter into the drying chamber 60 to form the liquid pool 21' are picked up by the liquid pickup line 64. The liquid pickup is based on the pressure P in chamber 60 being greater than the pressure P, in the downstream section 18. A suitable check valve 71 is provided in line 70 to prevent liquids from entering line 70 and hence the drying section 60.
In this manner the inner cylindrical wall 12 in the upstream section 16 becomes substantially dry as a result of a single traverse of pig 14 through pipe 10. The orientation of the nozzles 72 is such as to cause a stirring effect on whatever solid debris 21 that may have gathered in the water pool 20. This stirring effect facilitates the removal of the solids by the downstream flow of the water 20. The discharge under pressure of the gases and water through nozzles 72 also causes a rotation of the pig l4 inside the pipe 10 thereby equalizing the wear on the deformable sliding walls 24, 24. Since the swivel 86 is weighted, the hollow shaft 34 rotates inside the swivel to assure that the gas and water pickup line 64 is always directed downwardly so as to pick up any liquids in the pool 21' in the drying chamber 60 even at the lowermost portion of pipe 10.
While this invention has been described and illustrated with reference to presently preferred embodiments, it will be apparent to those skilled in the art that various modifications in the design of the pig as illustrated may be made without departing from the scope of the invention as defined in the appended claims.
What we claim is:
1. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
at least a front fluid pressure expandable plug and a rear fluid pressure expandable plug,
each plug being adapted to restrain fluid flow thereacross,
each plug having a deformable wall formed of resilient material and defining an external peripheral surface,
said surface being expandable in response to fluid pressure in said plug to provide a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
coupling means adapted to securely fasten said plugs to each other and to maintain said plugs in longitudinal spaced apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs;
said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug,
an upstream section in rear of said rear plug, and into said drying chamber;
said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and
between said drying chamber and said downstream section on the other hand,
whereby said fluid pressure gradient is established for propelling said pig through said pipe.
2. The pig as recited in claim 1 wherein said fluid communication means between said drying chamber and said downstream section of said pipe include liquid-extracting means for extracting liquids from said drying chamber and ejecting them into said downstream sectron.
3. The pig as recited in claim 2 wherein ing means include a siphon tube, and
siphon tube orientation means for orienting said siphon tube in a downwardly direction.
4. The pig as recited in claim 3 wherein said siphon tube orientation means include a swivel rotatably coupled to said coupling means.
5. The pig as recited in claim 1 wherein said coupling means include a hollow shaft in fluid communication with said fluid communication means.
6. The pig as recited in claim 1 wherein said fluid communication means further include fluid discharge means positioned in front of said front plug facing said downstream section.
7. The pig as recited in claim 6 wherein said fluid discharge means have an orientation to allow said pig to rotate inside said pipe in response to rotational forces generated by said fluid discharge means.
8. The pig as defined in claim 6 wherein said fluid discharge means cause the fluids contained in said downstream section in front of said front plug to become stirred up thereby facilitating the removal of any solids in front of said front plug.
9. The pig as recited in claim 1 wherein each plug includes a fluid pressure expandable tire mounted on a rim.
10. The pig as recited in claim 4 wherein said rotatably mounted swivel includes a ballast weight.
11. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
at least a front plug and a rear plug,
each plug being adapted to restrain fluid flow thereacross,
each plug having a wall defining an external peripheral surface,
said wall providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
coupling means adapted to fasten said plugs to each other and to maintain said plugs in longitudinal spaced-apart relationship'whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs; said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug,
an upstream section in rear of said rear plug, and into said drying chamber;
said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and
between said drying chamber and said downstream section on the other hand,
whereby said fluid pressure gradient is established for propelling said pig through said pipe; and
liquid pickup means responsive to said fluid pressure gradient between said drying chamber and said downstream section for removing liquids from said drying chamber.
12. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
at least a front plug and a rear plug,
said liquid extracteach plug being adapted to restrain fluid flow thereacross,
each plug having a deformable wall formed of resilient material and defining an external peripheral surface,
said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
coupling means adapted to securely fasten said plugs to each other and to maintain said plugs in longitudinal spaced apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs;
said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug,
an upstream section in rear of said rear plug, and into said drying chamber;
said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and
between said drying chamber and said downstream section on the other hand,
whereby said fluid pressure gradient is established for propelling said pig through said pipe; and
said coupling means including liquid pickup means comprising a swivel rotatably mounted on said coupling means and a siphon tube coupled to said swivel for picking up liquids from said drying chamber and expelling them into said downstream section.
13. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
at least one plug adapted to restrain fluid flow thereacross,
said plug having a deformable wall formed of resilient material and defining an external peripheral surface,
said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
said plug when inserted into said pipe divides said pipe into a downstream section in front of said plug, and
an upstream section in rear of said plug;
fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said downstream section, whereby said fluid pressure gradient is established for propelling said pig through said pipe; and
said fluid communication means including liquid pickup means comprising a swivel rotatably mounted on said fluid communication means and a siphon tube coupled to said swivel for picking up fluids from said upstream section and expelling them into said downstream section.
14. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising:
at least one plug adapted to restrain fluid flow thereacross,
said plug having a deformable wall formed of resilient material and defining an external peripheral surface,
said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe;
said plug when inserted into said pipe divides said pipe into a downstream section in front of said plug, and
an upstream section in rear of said plug;
fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said downstream section, whereby said fluid pressure gradient is established for propelling said pig through said pipe;
said fluid communication means including liquid pickup means comprising a siphon tube for picking up fluids from said upstream section and expelling them into said downstream section;
siphon tube orientation means for orienting said siphon tube in a downwardly direction.
Claims (14)
1. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising: at least a front fluid pressure expandable plug and a rear fluid pressure expandable plug, each plug being adapted to restrain fluid flow thereacross, each plug having a deformable wall formed of resilient material and defining an external peripheral surface, said surface being expandable in response to fluid pressure in said plug to provide a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe; coupling means adapted to securely fasten said plugs to each other and to maintain said plugs in longitudinal spaced apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs; said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug, an upstream section in rear of said rear plug, and into said drying chamber; said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and between said drying chamber and said downstream section on the other hand, whereby said fluid pressure gradient is established for propelling said pig through said pipe.
2. The pig as recited in claim 1 wherein said fluid communication means between said drying chamber and said downstream section of said pipe include liquid-extracting means for extracting liquids from said drying chamber and ejecting them into said downstream section.
3. The pig as recited in claim 2 wherein said liquid extracting means include a siphon tube, and siphon tube orientation means for orienting said siphon tube in a downwardly direction.
4. The pig as recited in claim 3 wherein said siphon tube orientation means include a swivel rotatably coupled to said coupling means.
5. The pig as recited in claim 1 wherein said coupling means include a hollow shaft in fluid communication with said fluid communication means.
6. The pig as recited in claim 1 wherein said fluid communication means further include fluid discharge means positioned in front of said front plug facing said downstream section.
7. The pig as recited in claim 6 wherein said fluid discharge means have an orientation to allow said pig to rotate inside said pipe in response to rotational forces generated by said fluid discharge means.
8. The pig as defined in claim 6 wherein said fluid discharge means cause the fluids contained in said downstream section in front of said front plug to become stirred up thereby facilitating the removal of any solids in front of said front plug.
9. The pig as recited in claim 1 wherein each plug includes a fluid pressure expaNdable tire mounted on a rim.
10. The pig as recited in claim 4 wherein said rotatably mounted swivel includes a ballast weight.
11. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising: at least a front plug and a rear plug, each plug being adapted to restrain fluid flow thereacross, each plug having a wall defining an external peripheral surface, said wall providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe; coupling means adapted to fasten said plugs to each other and to maintain said plugs in longitudinal spaced-apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs; said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug, an upstream section in rear of said rear plug, and into said drying chamber; said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and between said drying chamber and said downstream section on the other hand, whereby said fluid pressure gradient is established for propelling said pig through said pipe; and liquid pickup means responsive to said fluid pressure gradient between said drying chamber and said downstream section for removing liquids from said drying chamber.
12. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising: at least a front plug and a rear plug, each plug being adapted to restrain fluid flow thereacross, each plug having a deformable wall formed of resilient material and defining an external peripheral surface, said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe; coupling means adapted to securely fasten said plugs to each other and to maintain said plugs in longitudinal spaced apart relationship whereby a drying chamber is defined by the inner volume of said pipe confined between said plugs; said pig when inserted into said pipe divides said pipe into a downstream section in front of said front plug, an upstream section in rear of said rear plug, and into said drying chamber; said coupling means including fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said drying chamber on one hand, and between said drying chamber and said downstream section on the other hand, whereby said fluid pressure gradient is established for propelling said pig through said pipe; and said coupling means including liquid pickup means comprising a swivel rotatably mounted on said coupling means and a siphon tube coupled to said swivel for picking up liquids from said drying chamber and expelling them into said downstream section.
13. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising: at least one plug adapted to restrain fluid flow thereacross, said plug having a deformable wall formed of resilient material and defining an external peripheral surface, said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe; said plug when inserted into said pipe divides said pipe into a downstream section in front of said plug, and an upstream section in rear of said plug; fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said downstream section, whereby said fluid pressure gradient is established for propelling said pig through said pipe; and said fluid communication means including liqUid pickup means comprising a swivel rotatably mounted on said fluid communication means and a siphon tube coupled to said swivel for picking up fluids from said upstream section and expelling them into said downstream section.
14. A pipe line pig adapted to become propelled through a pipe by a fluid pressure gradient comprising: at least one plug adapted to restrain fluid flow thereacross, said plug having a deformable wall formed of resilient material and defining an external peripheral surface, said surface providing a movable seal between said surface and the adjacently surrounding portion of the inner cylindrical wall of said pipe; said plug when inserted into said pipe divides said pipe into a downstream section in front of said plug, and an upstream section in rear of said plug; fluid communication means for establishing fluid communication at least in the direction of fluid flow between said upstream section and said downstream section, whereby said fluid pressure gradient is established for propelling said pig through said pipe; said fluid communication means including liquid pickup means comprising a siphon tube for picking up fluids from said upstream section and expelling them into said downstream section; siphon tube orientation means for orienting said siphon tube in a downwardly direction.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81618169A | 1969-04-10 | 1969-04-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3600736A true US3600736A (en) | 1971-08-24 |
Family
ID=25219891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US816181A Expired - Lifetime US3600736A (en) | 1969-04-10 | 1969-04-10 | Pressurized pipeline pigs |
Country Status (1)
Country | Link |
---|---|
US (1) | US3600736A (en) |
Cited By (20)
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US3708819A (en) * | 1970-06-05 | 1973-01-09 | M Breston | Apparatus for drying pipelines |
US3731701A (en) * | 1970-07-25 | 1973-05-08 | Suzuei Co Ltd | Separator for forcing fluids by pipeline |
US4011100A (en) * | 1974-01-21 | 1977-03-08 | Ross L A R | Pipe cleaning method and apparatus |
US5699577A (en) * | 1996-12-27 | 1997-12-23 | Tdw Delaware, Inc. | Magnetic cleaning pig |
US6022421A (en) * | 1998-03-03 | 2000-02-08 | Sonsub International, Inc, | Method for remotely launching subsea pigs in response to wellhead pressure change |
US6099657A (en) * | 1997-11-21 | 2000-08-08 | Boyer; Mark L. | Method for cleaning a pipe |
US6527869B1 (en) * | 2000-06-08 | 2003-03-04 | Christopher J. Bourg | Method for cleaning deposits from the interior of pipes |
EP1215436A3 (en) * | 2000-12-12 | 2003-05-28 | I.S.T. Industrie Service Technologie Beratungs-und Beteiligungsgesellschaft mbh | Pipeline pig |
WO2003106882A1 (en) * | 2002-06-14 | 2003-12-24 | Tdw Delaware, Inc. | Inhibitor dispensing pipeline pig |
US6857158B1 (en) * | 2003-07-24 | 2005-02-22 | Junius Hunter | Apparatus for cleaning the interior of pipelines |
US6886206B1 (en) * | 1999-04-02 | 2005-05-03 | Total | Scraper for inhibiting corrosion in the arch of a pipe carrying a multiphase corrosive liquid |
US20100162503A1 (en) * | 2006-01-20 | 2010-07-01 | Rosen Swiss Ag | Cleaning Pig |
US20110100644A1 (en) * | 2009-10-30 | 2011-05-05 | Angus George Bowie | Pipeline tool |
CN104858187A (en) * | 2015-04-27 | 2015-08-26 | 中国石油大学(华东) | Depositional sulfur remover for high-sulfur-content gathering and transportation pipeline |
CN105822868A (en) * | 2015-12-31 | 2016-08-03 | 西华大学 | Hydraulic feedback speed-controllable pipeline robot |
US20170095846A1 (en) * | 2014-07-14 | 2017-04-06 | Mac & Mac Hydrodemolition Inc. | Method and apparatus for high pressure water treatment of the inside of a pipe section |
DE102016104761A1 (en) * | 2016-03-15 | 2017-09-21 | Rosen Swiss Ag | Pig for applying liquid to the inner wall of a pipeline |
US10213816B2 (en) | 2015-04-21 | 2019-02-26 | Tdw Delaware, Inc. | Pipeline pig with hydraulically balanced collapsible sealing elements |
CN110293104A (en) * | 2019-07-23 | 2019-10-01 | 泸州职业技术学院 | A kind of rotating-spray pipe cleaner with check valve |
US11446710B2 (en) * | 2018-12-14 | 2022-09-20 | The Boeing Company | Wash and dry tool for enclosed channels and method for use |
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Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3708819A (en) * | 1970-06-05 | 1973-01-09 | M Breston | Apparatus for drying pipelines |
US3731701A (en) * | 1970-07-25 | 1973-05-08 | Suzuei Co Ltd | Separator for forcing fluids by pipeline |
US4011100A (en) * | 1974-01-21 | 1977-03-08 | Ross L A R | Pipe cleaning method and apparatus |
US5699577A (en) * | 1996-12-27 | 1997-12-23 | Tdw Delaware, Inc. | Magnetic cleaning pig |
DE19750384B4 (en) * | 1996-12-27 | 2006-02-16 | TDW Delaware, Inc., Wilmington | Magnetic pipe cleaner |
US6099657A (en) * | 1997-11-21 | 2000-08-08 | Boyer; Mark L. | Method for cleaning a pipe |
US6022421A (en) * | 1998-03-03 | 2000-02-08 | Sonsub International, Inc, | Method for remotely launching subsea pigs in response to wellhead pressure change |
US6886206B1 (en) * | 1999-04-02 | 2005-05-03 | Total | Scraper for inhibiting corrosion in the arch of a pipe carrying a multiphase corrosive liquid |
US6527869B1 (en) * | 2000-06-08 | 2003-03-04 | Christopher J. Bourg | Method for cleaning deposits from the interior of pipes |
EP1215436A3 (en) * | 2000-12-12 | 2003-05-28 | I.S.T. Industrie Service Technologie Beratungs-und Beteiligungsgesellschaft mbh | Pipeline pig |
US6874193B2 (en) * | 2002-06-14 | 2005-04-05 | Tdw Delaware, Inc. | Inhibitor dispensing pipeline pig |
US6755916B1 (en) * | 2002-06-14 | 2004-06-29 | Tdw Delaware, Inc. | Method of dispensing inhibitor in a gas pipeline |
WO2003106882A1 (en) * | 2002-06-14 | 2003-12-24 | Tdw Delaware, Inc. | Inhibitor dispensing pipeline pig |
US20040200019A1 (en) * | 2002-06-14 | 2004-10-14 | Pruett Rick D. | Inhibitor dispensing pipeline pig |
US6857158B1 (en) * | 2003-07-24 | 2005-02-22 | Junius Hunter | Apparatus for cleaning the interior of pipelines |
US20100162503A1 (en) * | 2006-01-20 | 2010-07-01 | Rosen Swiss Ag | Cleaning Pig |
US8281444B2 (en) * | 2006-01-20 | 2012-10-09 | Rosen Swiss Ag | Cleaning pig |
US20110100644A1 (en) * | 2009-10-30 | 2011-05-05 | Angus George Bowie | Pipeline tool |
EP2343470A3 (en) * | 2009-10-30 | 2012-06-06 | STATS (UK) Limited | Pipeline tool |
US10774975B2 (en) * | 2009-10-30 | 2020-09-15 | Stats (Uk) Limited | Pipeline tool |
US20170095846A1 (en) * | 2014-07-14 | 2017-04-06 | Mac & Mac Hydrodemolition Inc. | Method and apparatus for high pressure water treatment of the inside of a pipe section |
US10478870B2 (en) * | 2014-07-14 | 2019-11-19 | Mac & Mac Hydrodemolition Inc. | Method and apparatus for high pressure water treatment of the inside of a pipe section |
US10213816B2 (en) | 2015-04-21 | 2019-02-26 | Tdw Delaware, Inc. | Pipeline pig with hydraulically balanced collapsible sealing elements |
CN104858187B (en) * | 2015-04-27 | 2016-05-25 | 中国石油大学(华东) | A kind of deposition sulphur remover for high sulfur-bearing gathering line |
CN104858187A (en) * | 2015-04-27 | 2015-08-26 | 中国石油大学(华东) | Depositional sulfur remover for high-sulfur-content gathering and transportation pipeline |
CN105822868B (en) * | 2015-12-31 | 2017-10-17 | 西华大学 | Hydraulic feedback rate controlling pipe robot |
CN105822868A (en) * | 2015-12-31 | 2016-08-03 | 西华大学 | Hydraulic feedback speed-controllable pipeline robot |
DE102016104761A1 (en) * | 2016-03-15 | 2017-09-21 | Rosen Swiss Ag | Pig for applying liquid to the inner wall of a pipeline |
US11446710B2 (en) * | 2018-12-14 | 2022-09-20 | The Boeing Company | Wash and dry tool for enclosed channels and method for use |
CN110293104A (en) * | 2019-07-23 | 2019-10-01 | 泸州职业技术学院 | A kind of rotating-spray pipe cleaner with check valve |
CN110293104B (en) * | 2019-07-23 | 2023-02-28 | 泸州职业技术学院 | Rotary injection pipe cleaner with one-way valve |
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