NZ742560B - Device for sealing pipelines - Google Patents
Device for sealing pipelinesInfo
- Publication number
- NZ742560B NZ742560B NZ742560A NZ74256016A NZ742560B NZ 742560 B NZ742560 B NZ 742560B NZ 742560 A NZ742560 A NZ 742560A NZ 74256016 A NZ74256016 A NZ 74256016A NZ 742560 B NZ742560 B NZ 742560B
- Authority
- NZ
- New Zealand
- Prior art keywords
- disc
- stationary
- rigid tube
- shank
- axial
- Prior art date
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 30
- 210000001699 lower leg Anatomy 0.000 claims abstract description 30
- 230000000295 complement Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims description 6
- 230000000875 corresponding Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims 1
- 230000000087 stabilizing Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000023298 conjugation with cellular fusion Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001681 protective Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- 230000021037 unidirectional conjugation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/20—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with a compressible solid closure member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/12—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ
- F16L55/124—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ introduced radially into the pipe or hose
Abstract
device for sealing a pipeline passageway, said device comprising: a rigid tube (2) having a longitudinal centerline oriented at an oblique angle relative to a vertical plane; a stationary disc (3) located toward a lower end of the rigid tube and having a truncated cone profile; a movable disc (4) located opposite the stationary disc and having a truncated cone profile facing that of the stationary disc (3), the moveable disc including a shank (40) passing through the stationary disc; an elastomeric sealing ring (50) located between the stationary and moveable discs and having a side profile complementary to the truncated cone profile, respectively, of the stationary and movable discs; at least one slider (70) projecting transversely from the rigid tube, the at least one slider including two faces (71, 72) parallel to each other but sloping relative to the longitudinal centerline of the rigid tube, the faces configured to engage a complementary portion of the shank; wherein a force applied to the at least one slider causes axial movement of the moveable disc relative to the stationary disc. The device provides a simple and easy to use configuration for a device for sealing pipeline passageways particularly beneficial for use in sealing smaller diameter pipeline passageways. ) located opposite the stationary disc and having a truncated cone profile facing that of the stationary disc (3), the moveable disc including a shank (40) passing through the stationary disc; an elastomeric sealing ring (50) located between the stationary and moveable discs and having a side profile complementary to the truncated cone profile, respectively, of the stationary and movable discs; at least one slider (70) projecting transversely from the rigid tube, the at least one slider including two faces (71, 72) parallel to each other but sloping relative to the longitudinal centerline of the rigid tube, the faces configured to engage a complementary portion of the shank; wherein a force applied to the at least one slider causes axial movement of the moveable disc relative to the stationary disc. The device provides a simple and easy to use configuration for a device for sealing pipeline passageways particularly beneficial for use in sealing smaller diameter pipeline passageways.
Description
DEVICE FOR SEALING PIPELINES
DESCRIPTION OF THE INVENTION
The present invention relates to the technical field concerning the equipment
for performing installation, repair and/or maintenance operations of pipelines, which
carry fluids under pressure, for example gas, water, hydrocarbons and the like, without
interrupting the service and avoiding the dispersion of polluting substances in the
environment.
In particular, the apparatuses intended to operate on pipelines of medium
dimensions are taken into consideration, for example those belonging to a distribution
system, having the diameter of some inches, either below or above ground level,
therefore excluding the domestic systems.
Such apparatuses are known as plugging machines and are installed in pairs,
respectively upstream and downstream of the piece of pipeline to be acted upon, and
joined with a temporary pipeline, so as to create a by-pass, into which the flow is
deviated without being interrupted.
More in detail, the pipeline is perforated in two selected points, a connector and
valve (called “flat valve” in jargon) are applied to each of the holes and then the
respective plugging machines are fastened thereto; each of the latter includes a
substantially bell-like, main body in which a plugging head is housed. The plugging
head is lowered, by suitable means, made to pass through the flat valve and
connector, so as to enter the underlying pipeline.
In the known solutions, the plugging head is lowered with its axis substantially
orthogonal with respect to the pipeline and then rotated by 90°, so as to arrange it
coaxial with the latter; afterwards, means are operated to move the two discs, provided
at the head, close to each other. A sealing ring, made of rubber or the like, having for
example a trapezoidal cross-section, is interposed between the two discs.
Due to the axial compression, the sealing ring expands radially, adhering
strongly to the inner surface of the pipeline, thus making a seal. The passing fluid is
forced to deviate within the main body of the plugging machine upstream, then to flow
into the temporary pipeline and reach the plugging machine downstream, through
which it is reintroduced into the pipeline via a reverse path.
From a constructive point of view, a plugging machine of known type presents
the maximum complexity in the means which allow and control inclination of the
{1572430;}
plugging head. These means must comply, both from the strictly dimensional point of
view and from the functional point of view, with the means that move the discs,
between which the sealing ring is interposed, close and away from each other.
Independently from the mechanical solutions chosen for the above mentioned
means and from their bigger or smaller functional validity, it is obviously understood
that the strength and reliability characteristics, which are obtained with considerable
dimensions in case of big plugging machines, cannot be found in plugging machines
suitable for medium dimension pipelines (in proportion to the necessary dimension
reduction, thus to the inner diameter of the pipeline).
In other words, some technical solutions, valid for certain dimensioning,
become poor with reduced dimensions.
{1572430;}
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to propose a device associated to a
plugging machine for sealing pipelines, particularly simple and essential, so as to
obviate the principal drawbacks reported by the known solutions.
Another object of the invention is to obtain a device which is indicated, due to
its constructive characteristics, with medium-small dimensions of the pipelines into
which it is to be introduced, for example, with a diameter of a few inches, and
consequently of the plugging machine.
A still further object of the invention is to realize a strong device, which is very
rigid, so as not to be adversely affected by the pressure of the fluid and to assure a
correct and stable position inside the pipeline, thus an optimal tightness.
A still further object of the invention is to propose a compact device, which is
easy to handle due to its limited weight and dimensions, quick to be installed and
equally quick to be removed, to limit the total cost of the operations that require its use.
These and other objects are wholly obtained by a device for sealing of pipelines
according to a first aspect of the present invention. The device comprises:
a plugging machine (100) including a body;
a rigid tube (2) supported by the body (101) of the plugging machine (100) and
extended therebelow;
a stationary disc (3) integral to a lower end (2B) of the rigid tube (2) and
including an axial through opening (30) to which an internal cavity (20) of the rigid tube
(2) is joined and which has a face (31) shaped like a truncated cone;
a movable disc (4) arranged coaxial with and counter-facing the stationary disc
(3) with a relative face (41) having a truncated cone profile symmetrical to that of the
face (31) of the stationary disc (3), the movable disc (4) including an axial shank (40)
adapted to be inserted slidably in the axial opening (30) of the stationary disc (3), so
that the mutual distance between them can be adjusted;
a sealing ring (50) of elastomeric material with a trapezoidal cross-section
interposed between the stationary (3) and movable (4) discs and configured to expand
radially outward when an axial compression is exerted on the stationary and moveable
discs;
a control rod (6) slidably inserted in the rigid tube (2), extended upwards to
come out from the body (101) of the plugging machine (100) and downwards to abut
against the axial shank (40) of the movable disc (4);
{1572430;}
sliding drive means (7) provided between a lower portion (6B) of the control rod
(6) and the axial shank (40) of the movable disc (4), operated by axial translation of
the control rod (6) so as to make the axial shank (40) and the movable disc (4) move
away from or close to the stationary disc (3), the sliding drive means including two
faces (71, 72) parallel to each other but sloping relative to a longitudinal centerline of
the rigid tube, the faces configured to engage a complementary portion of the axial
shank of the moveable disc; and
operating means (8), associated to an upper portion (6A) of the control rod (6),
provided to determine axial movements of the control rod (6).
In another aspect, the present invention provides a device for sealing a pipeline
passageway. The device comprises:
a rigid tube (2) having a longitudinal centerline oriented at an oblique angle
relative to a vertical plane;
a stationary disc (3) located toward a lower end of the rigid tube and having a
truncated cone profile;
a movable disc (4) located opposite the stationary disc and having a truncated
cone profile facing that of the stationary disc (3), the moveable disc including a
shank (40) passing through the stationary disc;
an elastomeric sealing ring (50) located between the stationary and moveable
discs and having a side profile complementary to the truncated cone profile,
respectively, of the stationary and movable discs;
at least one slider (70) projecting transversely from the rigid tube, the at least
one slider including two faces (71, 72) parallel to each other but sloping relative to
the longitudinal centerline of the rigid tube, the faces configured to engage a
complementary portion of the shank;
wherein a force applied to the at least one slider causes axial movement of the
moveable disc relative to the stationary disc.
{1572430;}
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics of the invention will become evident from the following
description of a preferred embodiment of the device for sealing of pipelines under
discussion, in accordance with the contents of the claims and with help of the enclosed
figures, in which:
Fig. 1 is a schematic vertical cross-section of a plugging machine, provided with
the sealing device under discussion associated to a pipeline;
Fig. 2 illustrates, in enlarged scale, the detail H of Fig. 1, to point out the part of
the device inserted in the pipeline, in non operating position;
Fig. 3 is a view similar to that of Fig. 2, with the device in operative position;
Fig. 4 is a perspective view of a control rod of the device;
Fig. 5 is a cross-section view of a stationary disc of the device and a movable
disc to be coupled with the stationary disc, moved away to be better pointed out;
Fig. 6 is a perspective view of the movable disc of the previous Figure.
{1572430;}
DETAILED DESCRIPTION OF THE INVENTION
The device 1 is provided in connection with a plugging machine 100 of
substantially known type shown schematically in Fig. 1.
The plugging machine 100 is intended to be fastened to a connector 110, made
integral and communicating with a pipeline 200 that conveys a fluid under pressure.
The plugging machine 100 is designed to cooperate with a twin machine (not
shown) associated with the pipeline 200 to create a by-pass that isolates a piece of
the pipeline without interrupting the flow to allow maintenance and/or repair operations
in the piece.
According to the invention, device 1 includes a rigid tube 2 supported by a body
101 of the plugging machine 100 and extending therebelow to pass through the
connector 110 and a flat valve 120 of known type associated to the same connector
110. In this way, the tube enters the pipeline 200 with an axis almost orthogonal to
that of the latter.
In the non-limiting example shown in the figures, the tube 2 is inclined with
respect to the condition of perpendicularity by about 4°.
The rigid tube 2 protrudes upwards from the body 101 passing through a collar
102, which assures the tightness against the leaks of the fluid in a known way not
shown in detail.
A stationary disc 3 is integral, for example as a single body, with a lower end
2B of the rigid tube 2. Due to the positioning of the plugging machine 100 on the
pipeline 200, the stationary disc 3 is arranged coaxial with the latter.
The stationary disc 3 is provided with an axial through hole 30 into which the
internal cavity 20 of the tube 2 opens. The stationary disc 3 has a truncated cone-
shaped face 31 opposite to the one facing the tube.
A first annular rim 310 is thus defined in the face 31, the inner part of which
slightly protrudes with respect to the outer part.
{1572430;}
The stationary disc 3 mates with a movable disc 4, arranged coaxial therewith,
opposite thereto and featuring a face 41 with a truncated cone profile symmetrical to
that of face 31 of the stationary disc 3.
Consequently, a second annular rim 410 is defined in the face 41 of the
movable disc 4. An annular groove 5 having a trapezoidal cross-section is defined
between the second annular rim 410 and the opposite first annular rim 310. The
annular groove 5 houses a sealing ring 50 of elastomeric material, having a
complementary trapezoidal cross-section, in such a way that its sides remain in
contact with the first and second annular rim 310, 410.
The movable disc 4 is provided also with an axial shank 40 adapted to run
slidably within the axial hole 30 of the stationary disc 3 so that the mutual distance
between the discs, and accordingly the width of the annular groove 5, can be adjusted.
The external diameter of the sealing ring 50 is slightly smaller with respect to the
inner diameter of the pipeline 200, in non-operating condition R, in which no axial
compression is exerted on the discs, that is when the movable disc 4 is moved away
from the stationary disc 3.
The ring 50 can expand radially in operating condition W in a manner as to
adhere sealingly to the inner surface of the pipeline 200, due to an axial compression
caused by moving closer of the discs 3, 4.
A control rod 6 is provided to control the movements of the movable disc 4 close
to or away from the stationary disc 3 from outside of the plugging machine 100. The
control rod 6 is introduced slidably into tube 2, extended upwards to come out from
the body 101 of the machine 100 and downwards to abut against the axial shank 40
of the movable disc 4.
Drive means 7 are interposed between the lower portion 6B of the control rod 6
and shank 40 and are operated by axial translation of the rod 6 to make the shank 40
and the integral movable disc 4 carry out corresponding axial movements away from
or closer to the stationary disc 3 and to determine respectively the non-operating
condition “R” and operating condition “W“ of the sealing ring 50.
The drive means 7 include at least a slider 70 projecting transversely from the
control rod 6 and provided with two faces 71, 72 parallel to each other but sloping with
respect to the longitudinal axis of the rod 6.
The slider 70 is aimed at engaging in a complementary groove 44 made in the
shank 40 so that the axial thrust exerted on the rod 6, in one or the other direction,
{1572430;}
generates a component of a force parallel to the axis of discs 3, 4, by means of the
contact surfaces 71, 72 of the slider 70 and the corresponding surfaces of the groove
44. Thus, according to the direction of this component, axial movements of the
movable disc 4 away from or close to the stationary disc 3 are carried out.
In a preferred embodiment of the drive means 7, two parallel flat surfaces 60 are
made in the lower portion 6B of the rod 6, from which two respective symmetrical
sliders 70 protrude.
The shank 40 of the movable disc 4 features a longitudinal slit 42 arranged on a
median plane of the shank 40, which is thus divided in two portions.
The facing faces of the slit 42 feature two of the above mentioned mirror-like
grooves 44, within which the lower portion 6B of the rod 6 can be slidably introduced
with its flat surfaces 60, and the two sliders 70 can engage with the corresponding
grooves 44.
In order to obtain the movement of the movable disc 4 due to the raising and
lowering of the rod 6, it is necessary that the inclination angle of the sliders 70 and the
grooves 44 coupled mating therewith is suitably determined with respect to the axis of
the discs 3, 4. The value of this angle is comprised between 55° and 60°.
Operating means 8, associated in the upper portion 6A of the control rod 6, can
determine the axial translations of the rod 6 between two extreme positions
corresponding to the non-operating condition “R” and operating condition “W” of the
sealing ring 50.
In another embodiment, the operating means 8 include a threading 80 made in
the upper portion 6A of the control rod 6 and aimed at meshing with a threaded hole
81 made in a screw ring 82, the latter being rotatably supported by the rigid tube 2 and
designed to be manually operated to rotate, in one direction or in the other, to raise or
lower the control rod 6.
Advantageously, the device 1 includes also anti-rotational means 9, associated
to the rigid tube 2 adapted to stabilize the position of the latter and of the integral
stationary disc 3 in a manner that the axis of the stationary disc 3, as well as the
movable disc 4, coincide on a horizontal plane with that of the pipeline 200.
The anti-rotational means 9 are composed of, for example, a flange 90 locked at
the upper end 2A of the tube 2 from which a bar 91 protrudes radially and the bar is
aimed at introducing in a fork 92 fastened to the body 101 of the machine 100.
The figures illustrate a technical solution, according to which the bar 91 is hinged
{1572430;}
to the flange 90 to rotate upwards and release from the constraint of the fork 92. This
feature is useful in the installation steps and removal of the plugging machine 100.
The present invention’s simple and essential structure makes it suitable when
the dimensions of the pipelines, in which it is to be introduced, are medium or medium-
small, for example with a diameter of a few inches.
The device according to the invention is strong and very rigid due to the
constructive solution of the tube which is made as a single body with the stationary
disc.
In this way, a considerable resistance to the pressure exerted by the fluid is
obtained and a correct and stable position inside the pipeline, and consequently an
optimal tightness can be assured.
A special importance must be given to the conformation of the drive means which
allow the movable disc to move close to and away from the stationary disc and
consequently the sealing ring to be compressed and released. The solution of inclined
sliders within likewise inclined grooves is very simple from a mechanical point of view,
and, at the same time, it is effective in functional terms and extremely compact.
The combination of advantageous characteristics of the invention allows a
compact and easy to handle device to be obtained due to its limited weight and
dimensions, quick to be installed and equally quick to be removed so as to limit the
total cost of the operation.
It is understood, however, that what has been described above is illustrative
and not limiting, therefore, possible detail variations that could become necessary for
technical and/or functional reasons, are from now considered within the protective
scope as defined in the claims below.
{1572430;}
Claims (16)
1. A device (1) for the sealing of pipelines, the device comprising: a plugging machine (100) including a body; a rigid tube (2) supported by the body (101) of the plugging machine (100) and extended therebelow; a stationary disc (3) integral to a lower end (2B) of the rigid tube (2) and including an axial through opening (30) to which an internal cavity (20) of the rigid tube (2) is joined and which has a face (31) shaped like a truncated cone; a movable disc (4) arranged coaxial with and counter-facing the stationary disc (3) with a relative face (41) having a truncated cone profile symmetrical to that of the face (31) of the stationary disc (3), the movable disc (4) including an axial shank (40) adapted to be inserted slidably in the axial opening (30) of the stationary disc (3), so that the mutual distance between them can be adjusted; a sealing ring (50) of elastomeric material with a trapezoidal cross- section interposed between the stationary (3) and movable (4) discs and configured to expand radially outward when an axial compression is exerted on the stationary and moveable discs; a control rod (6) slidably inserted in the rigid tube (2), extended upwards to come out from the body (101) of the plugging machine (100) and downwards to abut against the axial shank (40) of the movable disc (4); sliding drive means (7) provided between a lower portion (6B) of the control rod (6) and the axial shank (40) of the movable disc (4), operated by axial translation of the control rod (6) so as to make the axial shank (40) and the movable disc (4) move away from or close to the stationary disc (3), the sliding drive means including two faces (71, 72) parallel to each other but sloping relative to a longitudinal centerline of the rigid tube, the faces configured to engage a complementary portion of the axial shank of the moveable disc; operating means (8), associated to an upper portion (6A) of the control rod (6), provided to determine axial movements of the control rod (6).
2. A device for sealing a pipeline passageway, said device comprising: {1572430;} a rigid tube (2) having a longitudinal centerline oriented at an oblique angle relative to a vertical plane; a stationary disc (3) located toward a lower end of the rigid tube and having a truncated cone profile; a movable disc (4) located opposite the stationary disc and having a truncated cone profile facing that of the stationary disc (3), the moveable disc including a shank (40) passing through the stationary disc; an elastomeric sealing ring (50) located between the stationary and moveable discs and having a side profile complementary to the truncated cone profile, respectively, of the stationary and movable discs; at least one slider (70) projecting transversely from the rigid tube, the at least one slider including two faces (71, 72) parallel to each other but sloping relative to the longitudinal centerline of the rigid tube, the faces configured to engage a complementary portion of the shank; wherein a force applied to the at least one slider causes axial movement of the moveable disc relative to the stationary disc.
3. The device of claim 2, further comprising: a control rod (6) slidably inserted in the rigid tube tube and abutting against the axial shank of the movable disc.
4. The device of claim 2, further comprising: operating means (8), associated to an upper portion (6A) of the control rod, provided to determine axial movements of the control rod.
5. The device according to claim 2 further comprising: the stationary disc including an axial through hole (30); the movable disc including a shank (40) adapted to be inserted slidably in said axial through hole (30) of the stationary disc.
6. The device according to claim 2, further comprising: {1572430;} the elastomeric sealing ring moving between a retracted and an expanded state through an axial compression exerted on the moveable and stationary discs.
7. The device according to claim 2, the complementary portion of the shank including a groove (44).
8. The device according to claim 3, further comprising: two parallel flat surfaces (60) in said lower portion (6B) of said control rod (6), said shank (40) of the movable disc (4) including a longitudinal slit (42) situated in a median plane of the shank (40), with said slit (42) containing grooves (44) configured to allow sliding insertion of said lower portion (6B) of the rod (6) with said flat surfaces (60) and engagement of the at least one slider (70) into the corresponding grooves (44).
9. The device according to claim 7, wherein said at least one slider (70) and groove (44) are inclined with respect to an axis of said stationary (3) and movable (4) discs by an angle in a range of 55° to 60°.
10. The device according to claim 4, wherein said operating means (8) include a thread (80) made in said upper portion (6A) of said control rod (6), intended to mesh with a threaded hole (81) formed in a threaded ring (82).
11. The device according to claim 2, further comprising: a first annular rim (310) in a face (31) of the stationary disc (3), with an inner portion slightly protruding with respect to an external portion, and a second mirror-like annular rim (410) in a face (41) of the movable disc (4), an annular groove (5) with a trapezoidal section between the same first and second annular rims (310, 410), the annular groove being designed to receive said sealing ring (50) with a complementary trapezoidal cross-section.
12. The device according to claim 2, wherein said rigid tube (2) and stationary disc (3) are made integral as a single body. {1572430;}
13. The device according to claim 2, wherein the longitudinal centreline of said rigid tube (2) is inclined with respect to an axis of said stationary disc (3) by an angle in a range of 3° to 6°.
14. The device according to claim 2, wherein anti-rotational means (9) are associated with said rigid tube (2) for stabilizing the position of the rigid tube and of the stationary disc (3), so that an axis of the stationary disc (3), as well as of said movable disc (4), coincide on a horizontal plane.
15. The device according claim 14, wherein said anti-rotational means (9) include a flange (90), locked to an upper end (2A) of said rigid tube (2), from which a bar (91) projects radially, adapted to enter a fork (92) of a body (101) of the plugging machine (100).
16. A device according to claim 15, wherein said bar (91) is hinged with respect to said flange (90) and can rotate upwards to release itself from the constraint of said fork (92). {1572430;}
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/985,038 US9746088B2 (en) | 2015-12-30 | 2015-12-30 | Device for sealing pipelines |
US14/985,038 | 2015-12-30 | ||
PCT/US2016/068921 WO2017117245A1 (en) | 2015-12-30 | 2016-12-28 | Device for sealing pipelines |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ742560A NZ742560A (en) | 2020-04-24 |
NZ742560B true NZ742560B (en) | 2020-07-28 |
Family
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