KR20190115199A - Inflatable isolation tool with enhanced monitoring unit - Google Patents

Abstract

The present invention relates to an inflatable isolation tool having an improved monitoring unit. The isolation tool is to be installed in a pipe bore to separate a section of a bore while a pipe section is being replaced. Also, the isolation tool is to provide a sealing barrier extended in a horizontal direction across the pipe bore. The isolation tool includes a pair of inflatable sealing units installed in a middle tool section by a ring-shaped lower assembly preventing the sealing unit from being separated from a cavity of an inner tool by fixing the sealing unit at a predetermined position. The inflatable sealing unit permits flexibility as the inflatable isolation tool can be used within a range of the wider diameter in a pipe. When gas is pumped at same time in the both sealing units by a single gas inlet of a share type pipe assembly, the tool is self-centered at a proper position in the pipe. So, the inflatable isolation tool can be rapidly installed and removed. An operable holding unit insert is clamped on the surface of the inner pipe and maintains stop of the tool. A support leg unit assembly helps installation and removal of the tool. A rear plate forms multiple port connection units. The tool is electronically monitored by the additional improved monitoring unit.

Description

INFLATABLE ISOLATION TOOL WITH ENHANCED MONITORING UNIT}

The present invention generally relates to an improved mechanical assembly or isolation tool for use in providing a sealing barrier in a pipe bore during the replacement of a pipe section, and an improved monitoring unit for such mechanical assembly or isolation tool.

In the manufacture of fluid flow systems, it is typical to use conduits or pipes for the transfer of liquids, such as petrochemicals, or gases, such as natural gas. Since the pipes are made only of finite length, various lengths or elbows must be connected together to constitute the conduit fluid conveying means. This can be done by butt welding the ends of the pipes together or on elbows or the like, or alternatively, welding the ends of the pipes to a butt flange and in general juxtaposition of each butt of the respective butt flanges, for example. By means of juxtaposition of the two butt flanges together by the use of a bolt through the annular portion. Generally, such flanges cooperatively use a gasket as a sealing element. Since the amount of fluid escaping from any weld or flange / flange interface is required to be reduced to an acceptable limit, the weld is tested to determine whether there are any leaks.

The problem is related to creating a safe environment for performing hot work on existing pipelines carrying hydrocarbon resources. Canadian Patent No. 2,847,874, filed by Applicant, describes an isolation tool that safely isolates lines for high temperature work to maintain human safety. The isolation tool is arranged into the line where the hot-work is performed upstream. Once the isolation tool is properly installed and two outer seals are built, the medium is introduced and pressurized into the annulus between the seals. Once this pressure is established, the technician actively monitors the seal to ensure that no harmful vapors are transferred beyond the containment tool into the hot working zone. The problem that Applicants face in such a containment tool is that as the pipe grows, the containment tool needs to be larger to seal the larger pipe. However, this results in heavier, more expensive tools that are difficult to install and remove. There is also a need for being able to monitor remotely rather than in close proximity to the work area.

Thus, there is a need in the art for improved containment tools that alleviate the aforementioned problems.

The present invention generally relates to an improved mechanical assembly or isolation tool for use in providing a sealing barrier in a pipe bore during replacement of a pipe section, and an improved monitoring unit for such mechanical assembly or isolation tool. Surprisingly, it has been found that by the use of the present invention, one or more of the following advantages can be realized:

The tool is the same inflatable front and rear seal disposed in the mid-section of the tool, by an annular subassembly specially designed to secure the front and rear sealing elements in place to prevent them from falling into the interior cavity of the tool. Contains a pair of elements. In contrast to solid O-ring materials, having an expandable seal with a fairly large radial expansion capability allows for greater flexibility, whereby the tool can be used over a wider range of pipe diameters, thereby Many schedules can be used with a single tool. This also translates into a minimum manufacturing cost (eg, the manufacture of smaller sized isolation tools) and significant operating cost savings both in the company and their customers.

The expandable front and rear sealing elements are deformed in two directions to reduce the risk of leakage-radially inward to depress and seal against the annular subassembly and radially outward in a sealing engagement with the pipe, whereby The outer surface of the tool and the inner surface of the pipe are combined to form a tightly sealed annular space.

When the gas is pumped simultaneously into both the front and rear expandable sealing elements through a single gas inlet of the shared plumbing assembly, the tool is "self-centered" at its proper location in the pipe; And provide a sealed annular volume. Thus, the tool can compensate for problems in out-of-round piping applications, which is a common problem in large piping and may require a technician to spend time for processing in the field.

The tool can be installed quickly, because the tool is "self-centering" and does not require time-consuming torqueing of the particular pattern of studs. The technician places the tool in the pipe, adjusts the support leg assembly and grip insert of the tool, and the tool is “self-centered” within the pipe by the front and rear sealing elements that seal against the inner surface of the pipe. Simply pump air into the front and rear inflatable sealing elements until After use, the tool can be quickly removed because the technician simply has to bleed air from within the front and rear sealing elements and readjust the grip insert and support leg assembly. This requires difficult, time consuming assembly of pipes by slicing all components of the isolation tool in place in the pipe and by applying and tightening the torque to multiple studs according to a predetermined sequence. Compared to the containment tools of the prior art, there is a significant substantial improvement.

The tool can be moved from a resting non-operational position in the depression to an operating position for extending outwardly from the depression to contact and grip the inner surface of the pipe. insert). The grip pad is conveniently moved to be tightened against the inner surfaces of the various diameters of the pipe in order to keep the tool stationary at the proper position in the pipe and to maintain the back pressure without being moved out of the pipe. Possible and adjustable. As a result, the tool is easily and quickly deployed and remains stationary and stable in the pipe during use. The grip insert is formed of stainless steel taking into account material contact-compatibility. In particular, there is little or no risk of carbon contamination of the stainless steel pipe, since the grip insert is formed of the same material (ie stainless steel). In addition, the grip insert does not damage the inner diameter of the pipe as compared to other prior art tools.

The provision of a gripper insert eliminates the need to use a commercially available standard gripper kit to provide the back pressure-holding capacity, nitrogen purge, line-stop work, etc. required for a particular task. Remove

The tool comprises a support leg assembly which assists in the installation and removal of the tool to allow the tool to be deployed quickly. The support leg includes a roller ball that is smooth and will not damage the inner surface of the lower end of the pipe. The roller ball in the support leg is conveniently movable and adjustable up to different distances to accommodate various pipe diameters, through the thread of the screw.

The front plate, the back plate, and the annular subassembly are formed of aluminum to lighten the entire tool and to facilitate handling by the technician. The seal can be formed of different deformable and elastic materials (eg nitrile rubber) having various hardness values (ie EPDM 60-durometer, Buna-N 50-hardness).

The back plate may, for example, make any desired connection with a vent rod string or liquid level warning part for ventilation (i.e. steam, flare line, nitrogen purge, etc.). To provide a number of different sized port connections.

The tool includes a shoulder eye bolt, a lug, or both, through which chains, cables, ropes, and others can pass through and assist in climbing. The technician can also simply grip the lug for carrying the tool or the handle for handling the tool.

Information to the technician, for example, pressure testing, calibration, the amount and pressure of air pumped into the front and rear expandable sealing elements, and a warning signal in case one or both of the front and rear sealing elements has failed. The instrument is then monitored electronically by a separate enhanced monitoring unit so that it can be relayed back.

The enhanced monitoring unit provides "double alarms" by the provision of analog pressure gauges and digital pressure switches, which digital pressure switches measure pressure and allow the readings to be visible to technicians over long distances, green or Display the digital readout of the pressure in red. A digital pressure switch is connected to an auto flasher that activates the LED light to flash, serving as a second backup warning signal with a "red" reading. Where a warning bell or siren may not be heard in noisy environments or at long distances, visual cues are preferred. However, an audible warning may also be provided.

The technician can safely replace damaged sections of the pipe downstream of the tool. A pump located on the ground can be used to circulate the pressurized medium (eg, water) down into the sealed space of the annular subassembly and back to the ground. The medium (eg, water) pressurizes the sealed space formed by the annular subassembly. The pressure of the medium, which can be static or flowable, is displayed by an analog pressure gauge and a digital pressure switch, monitored and provides a real-time indication of sealing leaks. Observation of the readings will tell the technician whether there is a decrease in media pressure and thereby indicate a seal leak.

The tool may be used for hydrodynamic services. Instead of a medium (eg, water) that remains static in the sealed space formed by the annular subassembly, the medium can be circulated through the tool to remove heat from the metal of the pipe and to provide downstream or upstream piping for that heat. Protect from exposure. In one embodiment, the expandable front and rear sealing elements can withstand temperatures higher than about 1100 ° F. (or about 593 ° C.).

In one aspect, the present invention includes an inflatable isolation tool for placing in a pipe bore to isolate a section of the bore during replacement of a section of the pipe, and for providing a sealing barrier extending laterally across the pipe bore. Such a tool includes a linear assembly of components, wherein the linear assembly of such components is:

Forming a depression that receives a grip insert that is movable from an inoperable position within the depression to a working position extending outwardly from the depression to contact and grip the inner surface of the pipe to hold the tool stationary during operation. , Front plate;

A back plate carrying a support leg assembly to assist in the installation and removal of the tool in the pipe bore;

An annular subassembly disposed between the front plate and the rear plate, the annular subassembly comprising an annular core and an annular ring forming a groove for engaging with the same pair of front and rear inflatable sealing elements;

The front and rear inflatable sealing elements are elastic, deformable and annular, and when the front plate, the rear plate and the annular subassembly are compressed, the front and rear inflatable sealing elements are prevented from falling into the interior of the tool, and the annular It can be expanded at the same time to deform radially inward with respect to the subassembly and radially outward with the sealing engagement with the pipe, thereby and in combination with the outer surface of the tool and the inner surface of the pipe to form a tightly sealed annular space. do.

In another aspect, the present invention includes a monitoring unit for use with the inflatable isolation tool described above. The monitoring unit includes a housing, a front panel subassembly, a rear panel, an electrical inlet, and an LED power supply. In one embodiment, the front panel subassembly comprises a pair of analog pressure gauges and a pair of digital pressure switches for measuring the pressure and displaying the digital readout of the pressure in color to provide a first visual signal. The switch is electrically connected to a flasher for activating the LED light to provide a second visual signal.

Additional aspects and advantages of the invention will be apparent from the following description. It should be understood, however, that the detailed description and specific examples illustrate preferred embodiments of the invention, but are provided by way of illustration only, and from this detailed description those skilled in the art will clearly understand various changes and modifications within the spirit and scope of the invention. Because it is.

The invention will now be described using exemplary embodiments, with reference to the accompanying simplified, schematic, and non-actual drawings.
1 is an exploded perspective view of one embodiment of an inflatable isolation tool, detailing all components.
FIG. 2 is a front view of the inflatable isolation tool shown in FIG. 1.
3 is a cross-sectional view of the inflatable isolation tool shown in FIG. 1.
4A is a perspective view of the front plate of the inflatable isolation tool shown in FIG. 1.
4B is a front view of the front plate shown in FIG. 4A.
FIG. 5A is a perspective view of the grip insert of the inflatable isolation tool shown in FIG. 1. FIG.
5B is a side view of the gripper insert shown in FIG. 5A, showing the inner chamber in hidden line.
FIG. 5C is a cross-sectional view taken at section line II of FIG. 5B.
FIG. 5D is a side view of the bolt for insertion into the grip pad shown in FIG. 5B. FIG.
6A is a perspective view of the back plate of the inflatable isolation tool shown in FIG. 1, showing the front face of the back plate.
FIG. 6B is a front view of the back plate shown in FIG. 6A.
FIG. 6C is a cross-sectional view taken at section line II of FIG. 6B.
FIG. 6D is a perspective view of the back plate of the inflatable isolation tool shown in FIG. 1, showing the back face of the back plate. FIG.
FIG. 6E is a perspective view of a support leg assembly that may be attached to the back plate shown in FIG. 6D.
FIG. 7A is an exploded perspective view of the annular subassembly of the inflatable isolation tool shown in FIG. 1 showing the annular core, annular ring, and annular front and rear inflatable sealing elements. FIG.
FIG. 7B is a cross-sectional view taken at section line II of FIG. 7A.
8A is a front view of one embodiment of an enhanced monitoring unit for use with the inflatable isolation tool of FIG. 1.
FIG. 8B is an exploded perspective view of the improved monitoring unit main housing subassembly shown in FIG. 8A.
FIG. 8C is an exploded perspective view of the enhanced monitoring unit front panel subassembly shown in FIG. 8A, showing more specifically all internal components. FIG.

Prior to describing the present invention in more detail, it should be understood that the present invention is not limited to the specific embodiments described, but may of course vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not limiting, since the scope of the present invention will be limited only by the appended claims.

Where a range of values is given, unless otherwise stated, the value of each intermediate value between the upper and lower limits of the range, up to 1/10 of the lower limit, and such description It will be understood that any other stated or intermediate values within the ranges specified are included in the present invention. Upper and lower limits of these smaller ranges may also be included independently within the smaller range, and are also included in the present invention, according to any specifically excluded limits within the stated range. Where the stated range includes one or both of the limits, the range excluding either or both of the included limits is also included in the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, a limited number of exemplary methods and materials are described herein.

As used herein and in the claims, it should also be noted that the singular forms “a,” “an,” and “the” include plural objects unless the context clearly dictates otherwise.

The present invention provides a mechanical assembly or “isolation tool” for use in providing a sealing barrier that extends transversely across the pipe bore to isolate the section of the bore during replacement of the pipe section, and such mechanical assembly or isolation tool. An improved monitoring unit for the present invention.

The invention will now be described with reference to the accompanying drawings. The inflatable isolation tool 1 is shown unassembled in FIG. 1 and assembled and ready for operation in FIG. 3. The tool 1 is inserted into the bore of a horizontal or vertical pipe and seals against the pipe inner surface in use. As used herein, the term "horizontal" means the orientation of a plane or line that is substantially parallel to the plane of the horizontal line. As used herein, the term "vertical" means the orientation of a plane or line that is substantially perpendicular to the horizontal plane. In one embodiment, the pipe has an inner diameter of about 20 inches or more. The purpose of the tool 1 is to provide a sealed barrier that prevents the combustible fluid from moving from within the bore of the pipe to the point where a cutting, welding or other hot-working operation is carried out.

The tool 1 generally includes the following components: front plate 10, front inflatable sealing element 12, annular subassembly 14, rear inflatable sealing element 16, and rear plate 18. And an isolation assembly comprising a linear assembly of components that comprise. As used herein, the terms "front" and "rear" are used to describe the location of various components of the tool 1. The term "front" refers to a position closer to the open end of the pipe. The term "rear" refers to a position remote from the open end of the pipe. When the components are compressed together, the axially spaced annular front and rear expandable sealing elements 12, 16 expand to deform in two directions to reduce the risk of leakage—pressurizing and pressing against the annular subassembly 14. It is deformed radially inward to seal and radially outward in sealing engagement with the pipe, whereby it is combined with the outer surface of the tool and the inner surface of the pipe to form a sealed annular space. The support leg assembly 20 assists in the installation and removal of the tool 1 in the pipe bore.

The tool 1 is shown in the unassembled state in FIGS. 1, 2 and 4A-7B in order to show all the components more specifically.

4A-4B, the front plate 10 includes a front face 22, a rear face 24, an outer edge 26, an inner edge 28, a plurality of recesses 30, and a plurality of agents. It is a circular disk having one hole 32 and a plurality of second holes 34.

The first hole 32 is disposed over at least part or all of the front face 22 of the front plate 10. In one embodiment, the first holes 32 are evenly distributed in a manner spaced apart from the adjacent first holes 32 over the front face 22. In one embodiment, the first hole 32 is disposed on each side of the depression 30. The first hole 32 penetrates the elongated stud 36 secured by the complementary hex nut 38 and washer 39, as shown in FIG. 2, and is a component of the isolation tool 1. To assist in compression and assembly of the tape, it extends through the front plate 10 from the front face 22 to the rear face 24.

The second hole 34 is disposed over at least part or all of the front face 22 of the front plate 10. In one embodiment, the second holes 34 are evenly distributed in a manner spaced apart from the adjacent second holes 34 over the front face 22. In one embodiment, the second hole 34 is disposed between adjacent depressions 30 and between two first holes 32. As shown in FIGS. 1, 4A and 4B, the second hole 34 extends partially through the front plate 10 and is threaded to receive the complementary threaded shoulder eye bolt 40. C). In one embodiment, to accommodate the four shoulder eye bolts 40, four second holes 34 are used for the tool 1 of 24 inch diameter. However, it is contemplated that the number and size of the second holes 34 can be changed without departing from the scope of the present invention.

In the embodiment shown in FIG. 1, the front face 22 is formed of opposing lugs 42 integrally formed with the front plate 10 and projecting inwardly away from the outer edge 26 of the front plate 10. It contains a pair. In one embodiment, lug 42 is provided on tool 1 having a diameter of about 30 inches or more. For small tools 1 having a diameter, for example, in the range from about 20 inches to about 24 inches, shoulder eye bolts 40 are preferred over lugs 42. The tool 1 can be raised and moved using conventional oilfield equipment. To aid in the ascension, chains, cables, ropes, and the like may pass through shoulder eye bolts 40, lugs 42, or both. The technician can also simply grip the lug 42 to manually transport or handle the isolation tool 1. In one embodiment shown in FIG. 1, the front face 22 defines one or more protrusions 44 integrally formed with the front plate 10 and protruding inwardly away from the outer edge 26 of the front plate 10. Include. In one embodiment, the front face 22 includes two protrusions 44. The protrusion 44 supports a label or other tool information, such as, for example, a serial number or other text.

The front face 22 forms a depression 30 disposed along at least part or all of the outer edge 26 of the front plate 10. In one embodiment, the depressions 30 are evenly distributed in a manner spaced apart from the adjacent depressions 30 along the outer edges 26 of the front plate 10. In one embodiment, eight depressions 30 are used for the 36 inch diameter isolation tool 1. However, it is contemplated that the number and size of the depressions 30 can be changed without departing from the scope of the present invention. The depression 30 is configured to receive and receive the complementary movable gripping insert 48. In one embodiment, the depression 30 is shaped into a substantially rectangular shape to receive and receive the rectangular insert grip 48. Although the figure shows both the depression 30 and the grip insert 48 of a rectangular shape, those skilled in the art will understand that other shapes are within the scope of the present invention.

As shown in FIGS. 5A-5C, the movable gripping portion insert 48 defines a substantially rectangular body 50 having an upper end 52, a lower end 54, and a protruding edge 56. Include. As seen in the cross section of FIG. 5B, the upper end 52 is curved slightly concave, the lower end 54 is substantially flat while the sides 58a and 58b are tapered. The main body 50 forms an opening 60 extending through the main body 50 to accommodate the slotted spring pin 62 therethrough (FIG. 4A). Slotted spring pin 62 includes a cylindrical pin rolled from a strip of material having a slot so as to be flexible during insertion. Slotted spring pin 62 includes a body, the body having a diameter greater than the diameter of opening 60 and on either or both ends to assist in inserting pin 62 into opening 60. It has a chamfer. The spring action of the pin 62 allows the pin to be compressed if the pin has a diameter of the opening 60. As shown in FIG. 5D, the body 50 of the grip insert 48 receives a hex bolt 66 having a head 68, a thread 70, and a modified smooth end 72. The inner chamber 64 is configured to be fixed. A portion of the smooth end 72 was cut during manufacture to form the stem 74.

The front plate 10 defines a plurality of threaded recess openings 76 that extend through the front plate 10 from the outer edge 26 of the front plate 10 to the inner edge 28 thereof. When assembled, the hex bolt 66 is screwed into the recess opening 76 and extends through into the inner chamber 64 of the grip insert 48. As shown in FIGS. 5B and 5C, the opening 60 overlaps the inner chamber 64. The arrangement of the slotted spring pins 62 through the opening 60 is in contact with the stem 74 of the hex bolt 66 to hold the hex bolt 66 with respect to the gripper insert 48.

The hex bolt 66 is manually rotated by a technician to move the gripper insert 48 from the rest non-operational position in the recess 30 to the operating position to extend outwardly from the recess 30. Make contact with the inner surface of the grip and hold it. The grip insert 48 defines a plurality of strip grooves 78 formed longitudinally on the upper end 52 of the grip insert 48 to result in a gripping, serrated anti-slip surface. The grip insert 48 is provided with various diameter inner surfaces of the pipe to hold the tool 1 stationary at an appropriate position within the pipe and to maintain back pressure without moving out of the tool 1. It is conveniently movable and adjustable to be tightened relative to. Accordingly, the tool 1 is easily and quickly deployed and remains stationary and stable in the pipe during use.

The protruding edge 56 of the grip insert 48 accommodates and secures temporary or sacrificial O-rings (not shown), whereby the O-rings allow for front and rear expandable sealing elements 12, 16. ) Is placed on the front plate 10 to protect it from hot sparks or slag.

As shown in FIGS. 6A-6D, the back plate 18 is a circular disk having front and rear faces 80, 82. Front face 80 may support label 46 or other instrument information, such as, for example, serial number or other text.

The back plate 18 forms a plurality of threaded holes 84 disposed over at least part or the entirety of the front face 80. In one embodiment, the holes 84 are uniformly distributed in a manner spaced apart from the adjacent holes 84 near the outer edge 86 of the front face 80. The hole 84 extends partially into the back plate 18 to accommodate the complementary threaded end of the elongated stud 36 that aids in the compression and assembly of the components of the isolation tool 1.

The back plate 18 serves as a barrier extending laterally of the pipe bore. It may also play a role in the compression of the front and rear plates 10, 18 and the annular subassembly 14 together. After the components are compressed together, the axially spaced annular front and rear expandable sealing elements 12, 16 are radially inward with respect to the annular subassembly 14 and radially outward with a sealing engagement with the pipe. It can be expanded to deform, thereby combining with the outer surface of the tool 1 and the inner surface of the pipe to form a tightly sealed annular space.

The back plate 18 forms one or more port connections that include small, medium, or large diameter threaded openings for safely re-routing any upstream vapor away from the hot- working area. do. In order to further ensure the safety of the hot-work, the upstream activity can also be monitored via a gauge. If any change in upstream activity is detected, the hot-work is immediately stopped until the situation is resolved. For that purpose, the back plate 18 forms a port connection that extends through to enable the provision of gas ventilation (eg, steam, flare lines, nitrogen purge, etc.) or liquid level warnings. In one embodiment, the back plate 18 forms a central threaded opening 88. In one embodiment, the back plate 18 defines a peripheral threaded opening 87 for receiving a threaded half-coupler 89 and a threaded pipe plug 91. In one embodiment, the peripheral threaded opening 87 has a diameter greater than the diameter of the central threaded opening 88.

The back plate 18 forms two sets of openings 90 proximate to the hole 84 on the lower portion of the back plate 18. In one embodiment, each set of openings 90 is disposed above and between two adjacent holes 84. Each set of openings 90 includes a pair of aligned openings through which attachment means, such as, for example, cap screws 92, extend through to secure the support leg assembly 20.

As shown in FIG. 6E, the support leg assembly 20 includes a substantially “L” -shaped body 94 having a vertical wall 96 perpendicular to the horizontal base 98. The vertical wall 96 accommodates attachment means such as, for example, a cap screw 92, for fastening the support leg assembly 20 to the lower surface or rear surface 82 of the back plate 18. To form a pair of openings 100. The horizontal base 98 defines an opening 110 for mounting a ball transfer unit bolt fixing that includes a roller ball 112 mounted in an adjustable bolt 114. In one embodiment, the pair of support leg assemblies 20 allow the tool 1 to be easily centered and deployed. The tool 1 can be rolled on the movable roller ball 112 which is smooth and will not damage the bottom inner surface of the pipe and can easily be placed in the desired position on the bottom inner surface of the pipe. The bolt 114 of the ball transfer unit bolt fixture can be conveniently moved and adjusted up to different distances to accommodate various pipe diameters.

The support leg assembly 20 assists in installing and removing the tool so that the tool can be deployed quickly. In one embodiment, two support leg assemblies 20 support a 36 inch diameter isolation tool 1. However, it is contemplated that the number and style of support leg assemblies 20 may be varied without departing from the scope of the present invention. For example, in one embodiment (not shown), the roller ball 112 may be replaced with a wheel. In one embodiment (not shown), the grip insert 48 can be replaced by a bracket that includes a movable roller ball. In one embodiment, the pair of grip inserts 48 is replaced by a pair of brackets. Provision of a forward movable roller ball may be advantageous in long-reach applications.

As shown in FIGS. 1, 7A and 7B, the annular subassembly 14 is disposed between the front plate 10 and the back plate 18 and includes an annular core 116 and an annular ring 118. do. In one embodiment, the annular core 116 and the annular ring 118 are manufactured as separate components that are held together by welding or other suitable technique known to those skilled in the art, and then processed to form the annular subassembly 14. Cause. Both annular core 116 and annular ring 118 are substantially ring-shaped. The annular core 116 has a thickness thicker than the thickness of the annular ring 118. However, the annular ring 118 has a larger diameter than the annular core 116 to fit into and extend over the annular core 116, as shown in FIGS. 7A and 7B.

The annular ring 118 is disposed above the middle of the annular core 116 to form grooves 122a and 122b on the outer surface 120 of the annular core 116. Grooves 122a and 122b are engaged with front and rear inflatable sealing elements 12 and 16 extending over annular core 116. The annular ring 118 abuts against the front and rear inflatable sealing elements 12, 16 and separates the front inflatable sealing element 12 from the rear inflatable sealing element 16. Thereby, the annular core 116 and the annular ring 118 prevent the front and rear inflatable sealing elements 12, 16 from slipping or crushing into the internal cavity of the tool 1.

The annular ring 118 and the annular core 116 form first and second opposing ports 126a, 126b to receive the connecting plugs 128a, 128b extending therethrough (FIG. 3). In one embodiment, each connection plug 128a, 128b includes a brass connection plug, which provides good corrosion resistance, low wear resistance, and is softer and easier to thread than steel plugs. Connection plugs 128a and 128b are coupled to other components, such as, for example, elbows 130a and 130b and nipples 132a, 132b, 133a and 133b and are thus forward and backward expandable. It is finally coupled to a hose (not shown) to pump water in and out to monitor the ability of the sealing elements 12, 16. One connecting plug 128a serves as the media inlet, while the other connecting plug 128b serves as the media outlet. When the tool 1 is properly installed and the front and rear inflatable sealing elements 12, 16 are inflated, the medium (eg water) pressurizes the sealed space formed by the annular subassembly 14. The pressure gauge is used to display the pressure of the medium. The pressure of the medium, which may be static or flowing, is monitored and provides a real-time indication of sealing leaks. Observation of the gauge readings will tell the technician whether there is a decrease in media pressure and thereby indicate a seal leak.

The tool 1 provides the same pair of expandable front and rear sealing elements 12, 16 arranged in the mid-section of the tool 1 by the annular subassembly 14. The front and rear expandable sealing elements 12, 16 are cyclic and are made of deformable and elastic elastomeric material, such as ethylene propylene diene monomer (M-class) rubber (abbreviated as "EPDM" rubber). Is formed. In one embodiment, the front and rear inflatable sealing elements 12, 16 comprise EPDM rubber seals with a square profile (DR94, Dynamic Rubber, Inc).

As shown in FIG. 1, the front and rear inflatable sealing elements 12, 16 pump gas (eg, nitrogen) into the front and rear sealing elements 12, 16 to simultaneously expand such sealing elements. To tubing 142a, 142b connected to the gas inlet 144 and pressure gauges 146a, 146b for the purpose of monitoring and monitoring the pressure during expansion of the front and rear inflatable sealing elements 12, 16. It is configured with coupled threaded pipe lock nuts 140a, 140b. 1 and 3 show an exemplary “piping assembly” 148 for inflating the front and rear sealing elements 12, 16, the skilled person would appreciate that other assemblies for gas expansion and pressure measurement are within the scope of the present invention. Will be understood. When gas is pumped simultaneously into the front and rear inflatable sealing elements 12, 16 through a single gas inlet 144 of the shared piping assembly 148, the tool 1 effectively " -Centered ".

Having the front and rear inflatable sealing elements 12, 16 with relatively large radial expansion capability allows greater flexibility and convenience, which allows the tool 1 to be used in a wider range of pipe diameters. Because. This also translates into minimum manufacturing costs and significant operating cost savings for both the company and their customers. In addition, providing two axially separated front and rear inflatable sealing elements 12, 16 provide a safety factor. The spaced apart inflatable sealing elements 12, 16 can be monitored for sealing leaks, which, if detected, can provide an opportunity for welding breaks.

The tool 1 can be constructed from any material or combination of materials having suitable properties such as, for example, mechanical strength, low temperature and ability to withstand negative field conditions, corrosion resistance, and easy processing. In one embodiment, the front plate 10, the back plate 18 and the annular subassembly 14 are formed of aluminum such that the tool 1 is formed of a prior art isolation tool formed of steel or other material heavier than aluminum. Significantly lighter than; In comparison, prior art steel isolation tools weigh about 490 pounds. In one embodiment, the 36 inch diameter tool 1 has a weight of about 130 pounds. The front and rear inflatable sealing elements 12, 14 can be formed from EPDM rubber. Attachment means 36, 38, 39, 40, 66, 92, 140a, 140b (e.g. elongated studs, hex nuts, washers, shoulder eye bolts, slotted spring pins, hex bolts, cap screws, threaded Pipe lock nut) and ball transfer unit bolt fixings 112, 114 may be formed of steel, for example, stainless steel, carbon steel, and strength-bearing materials. The connection plugs 128a and 128b, the elbows 130a and 130b, and the nipples 132a, 132b, 133a, and 133b may be formed of brass or the like. The grip insert 48 is formed of stainless steel in view of contact-compatibility.

Once assembled, the tool 1 can be deployed quickly within minutes (eg, 10-15 minutes), rather than hours or days as required by a containment tool of the prior art. Operation of the tool 1 generally involves inserting the fully assembled tool 1 into a pipe bore. The bolt 114 of the support leg assembly 20 is pre-adjusted to a distance that accommodates a particular diameter of the pipe, and the tool 1 is partially “self-centered” into the desired position in the pipe. Rolled on 20. Subsequently, the hex bolt 66 is manually rotated by a technician to move the grip pad 48 from the rest non-operation position in the recess 30 to the operating position to extend outwardly from the recess 30. Contact and grip the inner surface of the pipe. The piping assembly 148 is then activated to pump gas through the gas inlet 144 into the front and rear expandable sealing elements 12, 16 that extend until it is sealed against the inner surface of the pipe. In one embodiment, the pressure of the gas pumped into the front and rear inflatable sealing elements 12, 16 can be visually monitored by reading the pressure gauges 146a, 146b.

In one embodiment, the pressure of the gas pumped into the front and rear inflatable sealing elements 12, 16 is remoted by the use of a separate enhanced monitoring unit 150, as shown in FIGS. 8A-8C. Can be monitored. Monitoring unit 150 includes information; For example, the technician may be informed of pressure testing, calibration, and the amount and pressure of gas pumped into the front and rear inflatable sealing elements 12, 16, and a warning signal in case of failure of the front and rear sealing elements 12, 16. And relay in reverse.

The enhanced monitoring unit 150 generally comprises a housing 152, front panel assembly, assembled together to form a substantially rectangular-shaped box to which the handle 158 can be attached by suitable attachment means 160. 154, and rear panel 156. The back panel 156 is removably attached by fastening means 162, 164 to allow access to the front panel subassembly 154. Various required labels 166a, 166b, 166c, 166d are attached to the monitoring unit 150, including, for example, authentication stickers, notification labels, warning labels, manufacturing labels, and the like. In order to receive a power cord connecting the monitoring unit 150 to a power source, an electrical inlet 168 is attached to one side of the housing 152 by an attachment means 170. In one embodiment (not shown), an internal battery is provided, eliminating the need to connect the monitoring unit 150 to a power source. LED green illuminated rocker switch 171a, with protective cover 171b, serves as an "on / off" switch. The electrical inlet 168 has a watertight and waterproof function to seal against moisture and wavefront. Power source 172 is electrically connected to front panel subassembly 154 via wires 176 for powering the LEDs. Fuse 178a and fuse holder 178b provide overcurrent protection of the electrical circuit.

The front panel assembly 154 is shown in the unassembled state in FIG. 8C, to illustrate the internal components more specifically. Front panel 180 is substantially rectangular-shaped to form window 182, window opening 183, top opening 184, middle opening 185, bottom opening 186, and corner opening 188. Includes the edition.

Window 182 is configured to receive and receive pressure switch mounting plate 190. The pressure switch mounting plate 190 has an opening for receiving a pair of digital pressure switches 194 mounted to the plate 190 by a bracket 196 and attached to the pipe fitting 195 and the pipe fitting 197. Form a pair. Required labels (eg, authentication stickers and the like) 198 may be attached to the pressure switch mounting plate 190. The transparent housing 200 is disposed above the digital pressure switch 194 and mounted by the attachment means 210. The housing 200 is fixed to the pressure switch mounting plate 190 by the fastening means 212. An optional identification tag 214 may be attached to the monitoring unit 150 by appropriate attachment means.

Top opening 184 receives pressure gauge 187. In one embodiment, the pressure gauge 187 is an analog pressure gauge. The middle opening 185 accommodates an LED lamp 218 mounted therein. In one embodiment, the first LED light is red 218a and the second LED light is amber 218b. The LED lamps 218a and 218b are electrically connected to the electronic flasher 220 by the wiring 222.

Bottom opening 186 is nipple 224, malleable union fitting (eg, coupled to another component, such as, for example, complementary fitting 228, for coupling to tubing fitting 230). malleable union fitting) 225, and a connection plug 226. Conduit fitting 230 receives tubing 232. Tubing 232 is attached to pipe fitting 233 and elbow 234, which in turn is connected to digital pressure switch 194 connected to the bottom port. The pressure switch holder 236 and the attachment means 238a, 238b, 238c secure the digital pressure switch to the front panel 180.

The corner opening 188 accommodates the attachment means 239 extending therethrough to secure the front panel 180 to the housing 152.

The tool 1 can be monitored electronically by connecting to the monitoring unit 150 using a suitable hose (not shown) connected to each of the nipple 224 and the connecting plug 226. In one embodiment (not shown), a flow meter is provided to monitor the flow rate of the vented gas. In one embodiment, the pressure reading is provided by both analog pressure gauge 187 and digital pressure switch 194. Each digital pressure switch 194 of the monitoring unit 150 may be initially adjusted using a button to set the desired minimum and / or maximum pressure for each of the “ventilation” and “tool”. The digital pressure switch 194 measures the pressure and displays the digital reading of the pressure in green or red so that the reading can be easily seen by the technician over long distances. "Green" indicates a reading of the pressure that meets the minimum and / or maximum set pressure. "Red" indicates the reading of the pressure above the maximum set pressure or lowered below the minimum set pressure. The digital pressure switch 194 is electrically connected to a flasher 220 that activates the LED lamps 218a and 218b to blink, serving as an additional warning signal with a "red" reading. The technician is thus warned of the problem of the tool 1 by a "dual" visual signal. Where a warning bell or siren may not be heard in noisy environments or at long distances, visual cues are preferred. However, hand-held devices, multiprocessor systems, microprocessor-based or programmable customer electronics, personal computers, network PCs, small-computers, mainframe computers, mobile phones, smartphones, tablets, personal digital assistants, and Audible warning or output messages for others may also be provided. In one embodiment, such apparatus is configured via a wireless communication protocol to set up, read, and / or monitor configuration, programming, operation, and messages from monitoring unit 150, and to allow data storage and retrieval. It may be temporarily or permanently connected to the monitoring unit 150.

A data acquisition system (not shown) captures and records the input from the digital pressure switch 194. Such data or other information; For example, pressure testing, calibration, and the amount of air pumped into the front and rear expandable sealing elements and warning signals when either or both of the front and rear sealing elements fail, can be relayed to the technician using a wireless transmitter. do.

Once the isolation tool 1 and seals 12, 16 are locked in place and the monitoring unit 150 is operated, the technician can safely replace the damaged section of the pipe downstream of the isolation tool 1. A pump located on the ground surface can be used to circulate the pressurized medium (eg, water) down into the sealed space of the annular subassembly 14 and back to the ground surface. The medium (eg, water) pressurizes the sealed space formed by the annular subassembly 14. The pressure of the static or flowing medium is displayed by the analog pressure gauge 187 and the digital pressure switch 194, monitored and provide a real time indication of the seal leak. Observation of the readings will tell the technician whether there is a decrease in media pressure and thereby indicate a seal leak. After use of the tool 1, the technician only has to readjust the grip insert 48 to withdraw gas from the front and rear sealing elements 12, 16 and to remove the tool 1 from the pipe bore. .

The tool can also be used for hydrodynamic services. Instead of a medium (eg, water) that remains static in the sealed space formed by the annular subassembly, the medium can be circulated through the tool to remove heat from the metal of the pipe and to provide downstream or upstream piping for that heat. Protect from exposure. In one embodiment, the expandable front and rear sealing elements can withstand temperatures higher than about 1100 ° F. (or about 593 ° C.).

However, it will be apparent to one skilled in the art that many additional modifications other than those already described may be made without departing from the spirit of the invention. Accordingly, the claimed subject matter is not limited except as by the scope of the disclosure. In addition, in interpreting the disclosure, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted to refer to an element, component, or step in a non-exclusive manner, and the element, component, or step referred to may exist or be used. Or may be combined with other elements, components, or steps not expressly described. Accordingly, various changes and modifications may be made and used to the exemplary embodiments without departing from the scope of the invention as defined in the following claims.

Claims (15)

An inflatable isolation tool for placing in a pipe bore to isolate a section of the bore during the replacement of a section of the pipe and for providing a sealing barrier extending laterally across the pipe bore, said tool comprising a linear assembly of components. The linear assembly of components includes:
Forming a depression that receives a grip insert that is movable from an inoperable position within the depression to a working position extending outwardly from the depression to contact and grip the inner surface of the pipe to hold the tool stationary during operation. , Front plate;
A back plate carrying a support leg assembly to assist in the installation and removal of the tool in the pipe bore;
An annular subassembly disposed between the front plate and the rear plate, the annular subassembly comprising an annular core and an annular ring forming a groove for engaging with the same pair of front and rear inflatable sealing elements;
The front and rear inflatable sealing elements are elastic, deformable and annular, and when the front plate, the rear plate and the annular subassembly are compressed, the front and rear inflatable sealing elements are prevented from falling into the interior of the tool, and the annular It can be expanded at the same time to deform radially inward with respect to the subassembly and radially outward with the sealing engagement with the pipe, thereby and in combination with the outer surface of the tool and the inner surface of the pipe to form a tightly sealed annular space Tool. The method of claim 1,
The front and rear inflatable sealing element includes a threaded pipe lock nut for coupling to a single gas inlet to simultaneously expand the front and rear inflatable sealing element. The method of claim 2,
The pressure of the gas inflating the front and rear inflatable sealing elements is monitored by a monitoring unit. The method of claim 3,
The monitoring unit includes a housing, a front panel subassembly, a rear panel, an electrical inlet, and an LED power source. The method of claim 4, wherein
The front panel subassembly includes a pair of analog pressure gauges and a pair of digital pressure switches for measuring pressure and displaying the digital readout of the pressure in color to provide a first visual signal, wherein the digital pressure switch includes an LED light. And electrically connected to a flasher for activating to provide a second visual cue. The method of claim 2,
An elongate stud extends through an opening formed by the front plate and the rear plate and is fixed by a complementary hex nut to compress the components together. The method of claim 6,
Wherein each grip insert forms a longitudinally formed strip groove on an upper end of the grip insert to result in a gripped, serrated slip-proof surface. The method of claim 7, wherein
Each grip insert further includes a body defining an opening for penetrating the slotted spring pin, and an interior chamber for receiving and securing a hexagonal bolt adjustable to actuate the grip pad. The method of claim 8,
Wherein the hex bolt includes an end forming a stem that cooperates with the slotted spring pin. The method of claim 9,
The front plate forms a recess opening for receiving the hexagon bolt through the inner chamber of the grip pad. The method of claim 8,
Each grip insert defines a protruding edge for securing the sacrificial O-ring to protect the front and rear inflatable sealing elements. The method of claim 2,
Each support leg assembly comprises a substantially L-shaped body having a vertical wall perpendicular to the horizontal base and forming an opening for receiving attachment means for attaching the support leg assembly to the back plate, The horizontal base forms an opening for mounting the adjustable bolt and roller ball. The method of claim 2,
The annular ring and the annular core form a pair of opposed ports for receiving a connection plug for coupling to a water hose for sealing leak testing. The method of claim 2,
The front plate is configured to provide a lifting means selected from the shoulder eye bolts, opposing lugs or both. The method of claim 2,
The back plate forms one or more port connections extending therethrough to allow for gas ventilation or the provision of a liquid level warning.

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