KR20190115198A - Improved isolation tool with enhanced monitoring unit - Google Patents

Abstract

An isolation tool is configured to provide a sealed barrier extending in a transverse direction over a bore to isolate a section of the bore in a process of replacing a pipe section. The isolation tool comprises: a front plate, a rear plate, and a central annular ring for fixing front and rear sealing elements in a proper position to prevent the elements from being separated into an inner tool cavity; a moving gripping portion insertion body tightened with respect to a pipe with various diameters to keep the tool stationary during operation; and a support leg portion assembly body helping the tool to be installed, centered, and removed. The rear plate forms a plurality of port connection portions. A swaged and brightly painted index corresponding to torque and tightness sequences can improve visibility in darkness. The tool is electronically monitored by an additional enhanced monitoring unit.

Description

IMPROVED 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 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 and into the hot work 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 one or more of the following advantages can be realized by the use of the present invention:

The front and rear plates and the central annular ring are specially designed to fix the front and rear sealing elements in place to prevent them from falling into the inner cavity of the tool as follows:

The front plate has a front face and a rear face, the rear face fixing the front sealing element in place bordered on the front face, thereby preventing the sealing element from leaving into the inner cavity of the tool.

An annular bevel on the back plate secures the rear sealing element in place, bordered with respect to the rear face of the rear plate, thereby preventing the sealing element from leaving into the internal cavity of the tool. In addition, when the front and rear plates and the central annular ring are compressed together during assembly, the annular slope cooperates with the rear sealing element by promoting outward radial formation of the sealing element.

The annular slopes on the central annular ring fix the front and rear sealing elements in place bordered against the front and rear plates, thereby preventing the sealing elements from leaving into the internal cavity of the tool. In addition, when the front and rear plates and the central annular ring are compressed together during assembly, the annular slope cooperates with the sealing element by facilitating outward radial formation of the sealing element. The annular ring is centered into a suitable position in the tool by a tapered annular support sleeve.

The back plate serves as a transversely extending barrier of the pipe bore. The back plate also plays a role in the act of compressing the front and rear plates and the central annular ring together to deflect the front and rear sealing elements outwardly into a sealing engagement with the inner surface of the pipe. The back plate also provides any desired connection with a vent rod string or liquid level warning, for example for ventilation (ie steam, flare line, nitrogen purge, etc.). To provide a number of different sized port connections.

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 insert is conveniently tightened against the inner surface of various diameters of the pipe to hold the tool stationary at the proper position in the pipe and to maintain the back pressure without being moved out of the pipe. Movable 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 includes a support leg assembly that assists in tool installation, centering, and removal to allow the tool to deploy rapidly. 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 assembly is conveniently movable and adjustable up to different distances to accommodate various pipe diameters, through the thread of the screw.

The tool accelerates deployment by reducing the number of threaded elongated studs required for the operation of the sealing mechanism. Since there are fewer studs to apply torque compared to those present in the prior art tools, installation proceeds quickly.

The tool can accommodate sealing elements of various sizes spanning a larger range of pipe diameters, thereby allowing many schedules to be used with a single tool. The tool utilizes larger O-rings more easily to cover larger radial gaps as compared to prior art tools. 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 tool can also 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 front plate, the back plate, and the central annular ring are made of aluminum in order to lighten the whole tool and to facilitate handling by the technician. The seal can be formed of different deformable and elastic materials (eg, nitrile rubber) having various durometer values (ie, Buna-N 50 Durometer).

In order to avoid blurring that often occurs in indicators painted directly on the surface, the front plate of the tool includes a stamped indicator corresponding to the torque and tightening sequence. For example, the indicator is filled with a luminous agent or bright yellow paint so that it can be clearly seen within the dark light or darkness of the pipe bore. The front plate has a thickness sufficient to prevent bending during torqueing and tightening.

The tool includes a shoulder eye bolt through which chains, cables, ropes, and others can pass through and assist in ascent. In some embodiments, the technician can also simply grasp a lug or handle to manually transport or handle the tool.

The tool can be relayed to a separate enhanced monitoring unit such that information-for example, pressure testing, calibration, and a warning signal in case one or both of the front and rear sealing elements fail-can be relayed to the technician and back. Is monitored electronically.

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 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 aspect, the present invention includes an 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 bore, the tool comprising A linear assembly of components, wherein the linear assembly of such components is:

A gripping portion reliably engaged with the front sealing element and movable from an inoperative position in the depression to an outwardly extending operating position in contact with and gripping the inner surface of the pipe for holding the tool stationary during operation. A front plate, forming a depression for receiving the insert;

A rear plate that forms an annular slope for secure engagement with the rear sealing element and includes a support leg assembly to assist in the installation, centering, and removal of the tool in the pipe bore;

A central annular ring disposed between the front plate and the back plate and forming an annular slope for cooperating with the front sealing element and the rear sealing element and for spacing the front sealing element and the rear sealing element;

The front sealing element and the rear sealing element are elastic, deformable and annular, and when the front plate, the rear plate and the central annular ring are compressed together, the front sealing element and the rear sealing element are prevented from falling into the interior of the tool, It is compressed and deformed outwardly into a sealing engagement with the pipe and combined with the outer surface of the tool and the inner surface of the pipe to form a sealed annular space.

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 with reference to exemplary embodiments, with reference to the accompanying simplified, schematic, and non-scale drawings.
1 is an exploded perspective view of the isolation tool, detailing all components.
2 is a cross sectional view of the isolation tool shown in FIG. 1 fully assembled;
3A is a perspective view of the front plate of the isolation tool shown in FIG. 1.
3B is a front view of the front plate shown in FIG. 3A.
3C is a cross sectional view of the front plate shown in FIG. 3A.
4A is a perspective view of the grip insert of the isolation tool shown in FIG. 1.
4B is a side view of the gripper insert shown in FIG. 4A, showing the inner chamber in hidden line.
4C is a cross-sectional view taken at section line II of FIG. 4B.
4D is a side view of the bolt for insertion into the gripper insert shown in FIG. 4B.
FIG. 5A is a perspective view of the back plate of the isolation tool shown in FIG. 1, showing the front face of the back plate. FIG.
5B is a front view of the back plate shown in FIG. 5A.
FIG. 5C is a cross-sectional view taken at section line II of FIG. 5B.
FIG. 5D is a perspective view of the back plate of the isolation tool shown in FIG. 1, showing the back face of the back plate. FIG.
5E is a perspective view of a support leg assembly that may be attached to the rear face of the back plate shown in FIG. 5D.
6A is a perspective view of the central annular ring of the isolation tool shown in FIG. 1.
FIG. 6B is a front view of the central annular ring shown in FIG. 6A.
FIG. 6C is a cross-sectional view taken at section line II of FIG. 6B.
7A is a perspective view of the annular support sleeve of the isolation tool shown in FIG. 1.
FIG. 7B is a front view of the annular support sleeve shown in FIG. 7A.
FIG. 7C is a cross-sectional view taken at section line II of FIG. 7B.
8A is a front view of one embodiment of an enhanced monitoring unit for use with the isolation tool of FIG. 1.
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 improved 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 isolation tool 1 is shown in an unassembled state in FIG. 1, and in FIG. 2 is assembled and ready for operation. The isolation tool 1 can be inserted into the bore of a horizontal or vertical pipe. 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 isolation 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 isolation tool 1 generally comprises the following components: front plate 10, front sealing element 12, central annular ring 14, rear sealing element 16, and back plate 18. An isolation assembly comprising a linear assembly of elements. As used herein, the terms "front" and "rear" are used to describe the location of various components of the containment 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 sealing elements 12, 16 deform radially outward and seal against the inner surface (not shown) of the pipe. The support leg assembly 20 helps to center the isolation tool 1 in the bore of the pipe.

The isolation tool 1 is shown in the unassembled state in FIGS. 1, 3A-7C, in order to more specifically show all the components.

3A-3C, the front plate 10 includes a front portion 22, a rear portion 24, an outer edge 26, an inner edge 28, a plurality of recesses 30, a plurality of large It is a circular disk having a hole 32 and a plurality of small holes 34.

The large hole 32 is disposed over at least part or all of the front portion 22 of the front plate 10. In one embodiment, the large holes 32 are uniformly distributed in a manner spaced apart from the adjacent large holes 32 over the front portion 22. In one embodiment, the large hole 32 is disposed on each side of the depression 30. The large hole 32 penetrates through an elongated stud 36 which is secured by a complementary hex nut 38, as shown in FIGS. 1 and 2, and compresses the components of the isolation tool 1. To assist in assembly, it extends through the front portion 22.

The front portion 22 includes an indicator 40 (eg, a number) disposed in proximity to each large hole 32 and near the outer edge 26 of the front plate 10. The indicator 40 corresponds to the torque and tightening sequence of the hex nut 38 and the stud 36 during assembly of the isolation tool 1. In one embodiment, a crosswise torque and tightening sequence is used for the circular bolt pattern on the front portion 22. In one embodiment, a 12 bolt cross torque and tightening sequence is used for the 24-inch diameter isolation tool (FIG. 3B). In one embodiment, an eight bolt crosswise torque and tightening sequence is used to reduce the amount of time required to torque and tighten the hex nut 38 and the stud 36. However, it is contemplated that the torque and tightening sequence may be changed without departing from the scope of the present invention. Proper torque and tightening sequence ensures a uniform preload distribution. In one embodiment, the front plate 10 has a thickness sufficient to prevent bending during torque application and tightening. In one embodiment, the front plate 10 has a thickness of about 3/4 inch. The indicator 40 is stamped onto the front portion 22 to prevent blurring as often occurs in indicators painted directly on the surface. For example, the indicator 40 is filled with a luminous agent or bright yellow paint so that it can be clearly seen in the dark light or darkness of the pipe bore.

Small holes 34 are disposed over at least some or all of the front portion 22 of the front plate 10. In one embodiment, the small holes 34 are uniformly distributed in a manner spaced apart from adjacent small holes 34 over the front portion 22. In one embodiment, small holes 34 are disposed between adjacent depressions 30 and between two large holes 32. As shown in FIG. 1, the small hole 34 extends partially through the front plate 10 and forms a thread (not shown) for receiving the complementary threaded shoulder eye bolt 42. In one embodiment, three small holes 34 are used for the 24 inch diameter isolation tool 1 to accommodate the three shoulder eye bolts 42. However, it is contemplated that the number and size of the small holes 34 can be changed without departing from the scope of the present invention. The containment tool 1 can be raised and moved using conventional oilfield equipment. To aid in the ascension, chains, cables, ropes, and the like can pass through the shoulder eye bolts 42.

In one embodiment (not shown), the front portion 22 may include a handle or lug that is integrally formed with the front plate 10 and protrudes inwardly away from the outer edge 26 of the front plate 10. . Such an embodiment may be suitable for a large isolation tool 1, which may have a diameter of, for example, greater than about 24 inches. The technician can simply grip the handle or lug to manually transport or handle the isolation tool 1.

The front portion 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, six depressions 30 are used for the isolation tool 1 of 24 inch diameter. 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 46. In one embodiment, the depression 30 is shaped substantially rectangular in order to receive and receive the rectangular insert grip 46. Although the figure shows both the depression 30 and the grip insert 46 of rectangular shape, those skilled in the art will understand that other shapes are within the scope of the present invention.

As shown in FIGS. 4A-4C, the movable gripping portion insert 46 defines a substantially rectangular body 48 having an upper end 50, a lower end 52, and a protruding edge 53. Include. As seen in the cross section of FIG. 4B, the upper end 50 is curved slightly concave, the lower end 52 is substantially flat, while the sides 54a and 54b are tapered. The main body 48 defines an opening 56 extending through the main body 48 for receiving the slotted spring pin 58 therethrough (FIG. 1). Slotted spring pin 58 includes a cylindrical pin rolled from a strip of material having a slot so as to be flexible during insertion. Slotted spring pin 58 includes a body, the body having a diameter larger than the diameter of opening 56, and on either or both ends to assist in inserting pin 58 into opening 56. It has a chamfer. The spring action of the pin 58 allows the pin to be compressed if the pin has a diameter of the opening 56. As shown in FIG. 4D, the body 48 of the grip insert 46 receives a hex bolt 62 having a head 64, a thread 66, and a modified smooth end 68. The inner chamber 60 is configured to be fixed. A portion of the smooth end 68 was cut during manufacture to form the stem 70.

The front plate 10 forms a plurality of recess openings 72 extending through the front plate 10 from the outer edge 26 of the front plate 10 to the inner edge 28 thereof. When assembled, hex bolt 62 is screwed into recess opening 72 and extends through into interior chamber 60 of grip insert 46. As shown in FIGS. 4B and 4C, the opening 56 overlaps the inner chamber 60. The arrangement of the slotted spring pins 58 through the openings 56 is in contact with the stem 70 of the hex bolts 62 to hold the hex bolts 62 relative to the gripper insert 46.

The hex bolt 62 is manually rotated by a technician to move the gripper insert 46 from the rest non-operation position in the recess 30 to the operating position to extend outwardly from the recess 30. Make contact with and grip the inner surface (not shown). The grip insert 46 defines a plurality of strip grooves 74 formed longitudinally on the upper end 50 of the grip insert 46 to result in a gripping, serrated anti-slip surface. The grip insert 46 is provided with respect to the inner surfaces of the various diameters of the pipes in order to hold the isolation tool 1 stationary at a suitable position in the pipe and to maintain the back pressure without being moved out of the pipe. It is conveniently movable and adjustable to be tightened. Thus, the isolation tool 1 is easily and quickly deployed and remains stationary and stable in the pipe during use.

The protruding edge 53 of the grip insert 46 accommodates and secures temporary or sacrificial O-rings (not shown), whereby the O-rings may secure the front and rear sealing elements 12, 16. It is placed on the front plate 10 to protect it from hot sparks or slag.

As shown in FIG. 3C, the rear portion 24 of the front plate 10 has a diameter smaller than the diameter of the front portion 22, such that the front sealing element 12 is outside of the rear portion 24. Engage with the front sealing element 12 to extend above the surface 88. The rear portion 24 secures the front sealing element 12 in place in contact with the front portion 22, whereby the front sealing element 12 slides or collapses into the interior cavity of the isolation tool 1. To prevent them.

As shown in FIGS. 5A-5D, the back plate 18 is a circular disk having front and rear faces 92, 94. In one embodiment, the front face 92 is sloped along its circumference to form an annular slope 96. The annular slope 96 is angled backwards, preferably about 15 degrees. The annular slope 96 is engaged with the rear seal element 16 such that the rear seal element 16 extends above the annular slope 96. The annular slope 96 secures the rear sealing element 16 in place in contact with the rear face 94 of the rear plate 18, whereby the rear sealing element 16 is inside the isolation tool 1. Prevents slipping or crushing into the cavity. In addition, when the front and rear plates 10, 18 and the central annular ring 14 are compressed together during assembly, by promoting the outward radial formation of the rear sealing element 16, the annular slope 96 is Cooperate with rear sealing element 16.

The back plate 18 forms a plurality of threaded holes 98 arranged over at least part or the entirety of the front face 92. In one embodiment, the holes 98 are evenly distributed in a manner spaced apart from the adjacent holes 98 near the outer edge 100 of the front face 92. The hole 98 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 transversely extending barrier of the pipe bore (not shown). The back plate also acts to compress the front and back plates 10, 18 and the central annular ring 14 together to deform the front and rear sealing elements 12, 16 outwardly into a sealing engagement with the inner surface of the pipe. It plays a role in

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. (FIGS. 5A-5C). 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 110. In one embodiment, the back plate 18 forms a small diameter threaded opening 111 having a smaller diameter as compared to other port connections. In one embodiment, the back plate 18 forms a pair of small diameter threaded openings 111 with one opening having a diameter of about 3/4 inch and the other opening having a diameter of about 2 inches. . In one embodiment, the back plate 18 defines a peripheral threaded opening 113 for receiving a half-coupler 115. In one embodiment, the peripheral threaded opening 113 has a diameter greater than the diameter of the central threaded opening 110.

On its rear face 94, shown in FIG. 5D, the back plate 18 forms two sets of openings 112 proximate to the hole 98 on the lower portion of the back plate 18. In one embodiment, each set of openings 112 is disposed over and between two adjacent holes 98. Each set of openings 112 includes a pair of aligned openings through which attachment means such as, for example, cap screws 114 extend, to secure the support leg assembly 20.

As shown in FIG. 5E, the support leg assembly 20 includes a substantially “L” -shaped body 116 having a vertical wall 118 perpendicular to the horizontal base 120. The vertical wall 118 accommodates attachment means such as, for example, cap screws 114, for fastening the support leg assembly 20 to the lower or rear surface 94 of the back plate 18. Form a pair of openings 122. The horizontal base 120 defines an opening 124 for mounting a ball transfer unit bolt fixing comprising a roller ball 126 mounted within the adjustable bolt 128. In one embodiment, the pair of support leg assemblies 20 allow the isolation tool 1 to be easily installed, deployed, and removed. The isolation tool 1 can be rolled on the movable roller ball 126 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 128 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 the installation, centering, and removal of the tool so that the tool 1 can be deployed quickly. In one embodiment, two support leg assemblies 20 support a 24 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 126 may be replaced with a wheel.

As shown in FIGS. 2 and 6A-6C, a central annular ring 14 is disposed between the front plate 10 and the rear plate 18. In one embodiment, annular ring 14 is sloped along the perimeter of both edges 130a and 130b to form annular slopes 132a and 132b. The annular slopes 132a and 132b are angled backwards, preferably about 15 degrees. The annular slopes 132a, 132b are engaged with the front and rear seal elements 12, 16, respectively, so that the front and rear sealing elements 12, 16 extend above the respective annular slopes 132a, 132b. The annular slopes 132a, 132b hold the front and rear sealing elements 12, 16 in place, bounded by the front and rear plates 10, 18, thereby the front and rear sealing elements 12, 16. Is prevented from slipping or crushing into the inner cavity of the isolation tool 1. Furthermore, when the front and rear plates 10, 18 and the central annular ring 14 are compressed together during assembly, the annular slopes by promoting outward radial formation of the front and rear sealing elements 12, 16. 132a, 132b cooperate with the front and rear sealing elements 12, 16.

The annular ring 14 forms first and second opposing ports 134a and 134b to accommodate the connecting plugs 136a and 136b extending therethrough (FIG. 2). In one embodiment, each connection plug 136a, 136b comprises a brass connection plug, which provides good corrosion resistance, low wear resistance, and is softer and easier to thread than steel plugs. The connecting plugs 136a, 136b are coupled to a hose (not shown) to pump the water in and out to monitor the capability of the front and rear sealing elements 12, 16. One connecting plug 136a serves as the media inlet, while the other connecting plug 136b serves as the media outlet. If the tool 1 is properly installed, 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.

During assembly, the annular ring 14 is guided and centered to its proper position by the plurality of annular support sleeves 138. As shown in FIGS. 7A-7C, each annular support sleeve 138 has a substantially cylindrical-shaped, tapered edge 140, and an opening through which the elongated stud 36 passes when assembled. 142 is formed. The annular support sleeve 138 acts as a guide, on which the annular ring 14 is centered and placed in a suitable position in the isolation tool 1. When properly disposed, the annular ring 14 abuts both the front and rear sealing elements 12, 16 and separates the front sealing element 12 from the rear sealing element 16. In one embodiment, four annular support sleeves 138 support the annular ring 14 within the 24-inch diameter isolation tool 1. However, it is contemplated that the number of annular support sleeves 138 may be changed without departing from the scope of the present invention.

The front and rear sealing elements 12, 16 are annular and are formed of a deformable and elastic material, such as nitrile rubber. In one embodiment, the front and rear sealing elements 12, 16 comprise O-rings, and more particularly, O-rings of Buna-N, 50 durometer values that are compatible with oil and gas. As described above, the front and rear plates 10, 18 and the central annular ring 14 capture the O-rings 12, 16 in place so that the O-rings are internal cavities of the isolation tool 1. It is specifically designed to prevent deviations into. Conveniently, the isolation tool 1 can accommodate various sizes of O-rings 12, 16 over a wider range of pipe diameters, whereby many schedules are used with a single isolation tool 1. To be possible. In one embodiment, for example, one 24 inch isolation tool 1 may be used with an O-ring having a size range of about 5/8 inch cross section diameter to about 1 inch cross section diameter. 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 sealing elements 12, 16 provide a safety factor. The spaced sealing elements 12, 16 can be monitored for sealing leaks, which, if detected, can provide a welding break opportunity.

The isolation tool 1 may 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 central annular ring 14 are formed of aluminum so that the isolation tool 1 is formed of prior art isolation formed from steel or other material heavier than aluminum. Significantly lighter than a tool; In comparison, prior art steel isolation tools weigh about 330 pounds. In one embodiment, the 24-inch diameter isolation tool 1 weighs about 97 pounds. The O-ring may be formed of nitrile rubber that is compatible with oils and gases. Attachment means 36, 38, 42, 58, 62, 114 (e.g. elongated studs, hex nuts, shoulder eye bolts, slotted spring pins, hex bolts, cap screws) and ball transfer unit bolt fixings ( 126, 128 may be formed of steel, for example, stainless steel, carbon steel, and strength-bearing materials. The connection plugs 136a and 136b may be formed of brass or the like. The grip insert 46 is formed of stainless steel in view of contact-compatibility. In particular, there is little or no risk of carbon contamination of the stainless steel pipe, since the grip insert 46 is formed of the same material (ie stainless steel).

The isolation tool 1 can be assembled quickly inside the pipe in less than an hour, but not from several hours to one day as is required in conventional isolation tools. During the development of the present invention, it was found that the assembly time was less than 1 hour for a relatively large 36 inch diameter tool. By piecing all the components of the tool 1 in place in the pipe, the tool 1 has been assembled in the desired position in the pipe. The bolts 128 of the support leg assembly 20 are pre-adjusted to a distance that accommodates a particular diameter of the pipe, and the tool 1 is “self-centered” into the desired position in the pipe. Roll). The hex nut 38 and the stud 36 are torqued and tightened in the sequence described by the indicator 40 on the front plate 10, whereby the front and rear plates 10, 18 and the central annular ring ( 14) is compressed together to deform the front and rear sealing elements 12, 16 into a sealing engagement with the inner surface of the pipe. The hex bolt 62 is then manually rotated by the technician to move the gripper insert 46 from the rest non-operation position in the recess 30 to the operating position and extend outwardly from the recess 30. , Make contact with the inner surface of the pipe and grip it. Once the isolation tool 1 and seals 12, 16 are secured in place, the technician can safely replace the damaged section of the pipe downstream of the isolation tool 1.

When the tool 1 is properly installed and the front and rear sealing elements 12, 16 are compressed and deformed outwards in a sealing engagement with the pipe, the medium (eg water) is sealed by the annular subassembly 14. Pressurized space. The pressure gauge is used to display the pressure of the medium. The media pressure, which can be static or flowable, is monitored and provides a real-time indication of seal leakage. Observation of the gauge readings will tell the technician whether there is a decrease in media pressure and thereby indicate a seal leak.

In one embodiment, the pressure of the medium may be monitored remotely by the use of a separate enhanced monitoring unit 150, as shown in FIGS. 8A-8C. Monitoring unit 150 includes information; For example, pressure testing, calibration, and warning signals in case of failure of the front and rear sealing elements 12, 16 are relayed to the technician and vice versa.

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, 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, small 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, for example coupled to another component, such as, for example, complementary fitting 228, for coupling to tubing fitting 230. A malleable union fitting 225 and a connecting plug 226 are received. 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, a flow meter (not shown) 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 is 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, 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, a warning signal in the event of failure of either or both of the pressure testing, calibration, and front and rear sealing elements is relayed to the technician using a wireless transmitter.

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.

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.

After use of the tool 1, the technician disassembles all the components of the tool 1 piece by piece from within the pipe, such disassembly of the front and rear plates 10, 18 and compression of the central annular ring 14. Adjusting the grip insert 46 and loosening the hex nut 38 for release and to remove the sealing bond between the front and rear sealing elements 12, 16 and the inner surface of the pipe. .

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 (14)

An isolation tool for positioning in the pipe bore and for providing a sealing barrier extending laterally across the bore to isolate the section of the bore during the replacement of the section of the pipe, the tool comprising a linear assembly of components, The linear assembly of components is:
A gripping portion reliably engaged with the front sealing element and movable from an inoperative position in the depression to an outwardly extending operating position in contact with and gripping the inner surface of the pipe for holding the tool stationary during operation. A front plate, forming a depression for receiving the insert;
A rear plate that forms an annular slope for secure engagement with the rear sealing element and includes a support leg assembly to assist in the installation, centering, and removal of the tool in the pipe bore;
A central annular ring disposed between the front plate and the back plate and forming an annular slope for cooperating with the front sealing element and the rear sealing element and for spacing the front sealing element and the rear sealing element;
The front sealing element and the rear sealing element are elastic, deformable and annular, and when the front plate, the rear plate and the central annular ring are compressed together, the front sealing element and the rear sealing element are prevented from falling into the interior of the tool, Wherein the tool is compressed and deformed outwardly into a sealing engagement with the pipe and combined with the outer surface of the tool and the inner surface of the pipe to form a sealed annular space. The method of claim 1,
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 2,
The front plate includes a stamped and painted indicator corresponding to the torque and tightening sequence for the hex nut and the elongated stud. The method of claim 2,
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 4, wherein
Each grip insert further includes a body defining an opening for penetrating the slotted spring pin, and an inner chamber for receiving and securing a hex bolt that is adjustable to actuate the grip insert. The method of claim 5,
Wherein the hex bolt includes an end forming a stem that cooperates with the slotted spring pin. The method of claim 6,
The front plate defines a recess opening for receiving the hexagon bolt through the inner chamber of the grip insert. The method of claim 5,
Each grip insert defines a protruding edge for securing the sacrificial O-ring to protect the front and rear 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 defining an opening for receiving attachment means for attaching the support leg assembly to the back plate. And the horizontal base forms an opening for mounting the adjustable bolt and roller ball. The method of claim 2,
The central annular ring forms a pair of opposed ports for receiving a connection plug for coupling to a hose for sealing leak testing. The method of claim 10,
Further comprising an annular support sleeve for centering the central annular ring, each annular support sleeve being substantially cylindrically shaped, having a tapered edge, and defining an opening for allowing the passage of an elongated stud; . The method of claim 1,
The front plate, the back plate, and the central annular ring are formed of aluminum, and the grip insert is formed of stainless steel. The method of claim 1,
The front plate is configured to provide a lifting means selected from the shoulder eye bolts, lugs, handles, or a combination thereof. The method of claim 1,
The back plate forms one or more port connections comprising threaded openings extending therethrough to allow for gas ventilation or provision of liquid level warnings.

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