CA2852546A1 - Closure apparatus for resource-transport pipeline and method therefor - Google Patents

Abstract

A closure apparatus for a resource-transport pipeline defines a pipeline passageway; the closure apparatus includes a first closure assembly configured to selectively cover the pipeline passageway of the resource-transport pipeline; the first closure assembly defines a closure channel extending through the first closure assembly in such a way that the closure channel is in fluid communication with the pipeline passageway once the first closure assembly is positioned to cover the pipeline passageway; the closure apparatus also includes a second closure assembly configured to selectively sealably cover the closure channel of the first closure assembly once the second closure assembly is positioned to cover the closure channel.

Description

CLOSURE APPARATUS FOR RESOURCE-TRANSPORT PIPELINE AND METHOD
THEREFOR
TECHNICAL FIELD
[0001] Aspects generally relate to (and are not limited to) a closure apparatus for a resource-transport pipeline, a method thereof, and/or a resource-transport pipeline having a closure apparatus.
SUMMARY

[0002] Issues surrounding operational safety of resource-transport pipelines were studied. For instance, pipelines conveying flammable or explosive material, such as natural gas or oil, pose safety concerns.

[0003] In view of the foregoing, it will be appreciated that there exists a need to mitigate (at least in part) problems associated with addressing safety issues surrounding resource-transport pipelines. After much study of the safety issues of resource-transport pipelines along with experimentation, an understanding of the problem and its solution has been identified and is articulated below.

[0004] In order to mitigate, at least in part, the problem(s) identified with resource-transport pipelines, there is provided (in accordance with an aspect) a closure apparatus for a resource-transport pipeline defines a pipeline passageway; the closure apparatus includes a first closure assembly configured to selectively cover the pipeline passageway of the resource-transport pipeline; the first closure assembly defines a closure channel extending through the first closure assembly in such a way that the closure channel is in fluid communication with the pipeline passageway once the first closure assembly is positioned to cover (and/or close) the pipeline passageway; the closure apparatus also includes a second closure assembly configured to selectively sealably cover the closure channel of the first closure assembly once the second closure assembly is positioned to cover (and/or close) the closure channel.

[0005] In order to mitigate, at least in part, the problem(s) identified with resource-transport pipelines, there is provided (in accordance with an aspect) a closure apparatus for a resource-transport pipeline defining a pipeline passageway; the closure apparatus includes a first closure assembly defining a closure channel extending therethrough; the first closure assembly is configured to be selectively movable between a closed position and an open position relative to the pipeline passageway of the resource-transport pipeline; the closure apparatus also includes a second closure assembly configured to be selectively movable between a closed state and an open state relative to the closure channel of the first closure assembly.

[0006] In order to mitigate, at least in part, the problem(s) identified with resource-transport pipelines, there is provided (in accordance with an aspect) a resource-transport pipeline defining a pipeline passageway; the resource-transport pipeline includes a closure apparatus; the closure apparatus includes a first closure assembly defining a closure channel extending therethrough; the first closure assembly is configured to be selectively movable between a closed position and an open position relative to the pipeline passageway of the resource-transport pipeline; the closure apparatus also includes a second closure assembly configured to be selectively movable between a closed state and an open state relative to the closure channel of the first closure assembly.

[0007] In order to mitigate, at least in part, the problem(s) identified with resource-transport pipelines, there is provided (in accordance with an aspect) a method of operating a closure apparatus for a resource-transport pipeline defining a pipeline passageway;
the method includes:
(A) selectively moving a first closure assembly defining a closure channel extending therethrough between a closed position and an open position relative to the pipeline passageway of the resource-transport pipeline; and (B) selectively moving a second closure assembly between a closed state and an open state relative to the closure channel of the first closure assembly.

[0008] In order to mitigate, at least in part, the problem(s) identified with resource-transport pipelines, there is provided (in accordance with an aspect) a method of operating a closure apparatus for a resource-transport pipeline defining a pipeline passageway.
The method includes selectively covering the pipeline passageway of the resource-transport pipeline with a first closure assembly defining a closure channel extending through the first closure assembly in such a way that the closure channel is in fluid communication with the pipeline passageway once the first closure assembly is positioned to cover the pipeline passageway. The method also includes selectively sealably covering the closure channel of the first closure assembly with a second closure assembly once the second closure assembly is positioned to cover the closure channel.

[0009] In order to mitigate, at least in part, the problem(s) identified above, in accordance with an aspect, there is provided other aspects as identified in the claims.

[00010] Other aspects and features of the non-limiting embodiments may now become apparent to those skilled in the art upon review of the following detailed description of the non-limiting embodiments with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS

[00011] The non-limiting embodiments may be more fully appreciated by reference to the following detailed description of the non-limiting embodiments when taken in conjunction with the accompanying drawings, in which:

[00012] FIG. 1 (SHEET 1/23) depicts a cross-sectional view of an example of a resource-transport pipeline;

[00013] FIGS. 2A, 2B, 2C, 2D and 2E (SHEETS 2/23 to 6/23, respectively) depict views of an example of a closure apparatus for the resource-transport pipeline of FIG. 1;

[00014] FIGS. 3A, 3B, 3C and 3D (SHEETS 7/23 to 10/23, respectively) depict views of examples of a closure apparatus for the resource-transport pipeline of FIG. 1;

[00015] FIGS. 4A, 4B and 4C (SHEETS 11/23 to 13/23, respectively) depict views of examples of a closure apparatus for the resource-transport pipeline of FIG. 1; and

[00016] FIGS. 5, 6, 7A, 7B, 7C, 8, 9, 10, 11 and 12 (SHEETS 14/23 to 23/23, respectively) depict cross-sectional side views of examples of a closure apparatus for the resource-transport pipeline of FIG. 1.

[00017] The drawings are not necessarily to scale and may be illustrated by phantom lines, diagrammatic representations and fragmentary views. In certain instances, details not necessary for an understanding of the embodiments (and/or details that render other details difficult to perceive) may have been omitted.

[00018] Corresponding reference characters indicate corresponding components throughout the several figures of the Drawings. Elements in the several figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be emphasized relative to other elements for facilitating an understanding of the various presently disclosed embodiments. In addition, common, but well-understood, elements that are useful or necessary in commercially feasible embodiments are often not depicted in order to facilitate a less obstructed view of the various embodiments of the present disclosure.
LISTING OF REFERENCE NUMERALS USED IN THE DRAWINGS
100 closure apparatus 102 first closure assembly 103 first closure lug 104 closure channel 105 first closure threads 108 closed position 110 open position 112 second closure assembly 113 second closure lug 114 closed state 115 internal threads 116 open state 117 end section 118 interface assembly 119 interface channel 120 pivot assembly 121 pivot support 122 closure-extension assembly 123 end portion 124 extension channel 125 pressure-alert valve 126 arm assembly 127 chain assembly 128 slidable-collar assembly 129 gasket 130 collar channel 132 stop assembly 134 pressure-relief valve 135 rotation movement 136 pivotal movement 900 resource-transport pipeline 901 ground 902 pipeline passageway 903 support structure 904 pig receiver 905 isolation valve 906 pig interface 908 pig apparatus 910 vent device 911 vent valve 912 drain device 913 drain valve 914 pipeline closure 916 closure interface 917 weld line 918 threads 920 discovery tool 922 user 924 frozen hydrate DETAILED DESCRIPTION OF THE NON-LIMITING EMBODIMENT(S)

[00019] The following detailed description is merely exemplary in nature and is not intended to limit the described embodiments or the application and uses of the described embodiments. As used herein, the word "exemplary" or "illustrative" means "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other implementations. All of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. For purposes of the description herein, the terms "upper," "lower," "left," "rear," "right," "front," "vertical,"
"horizontal," and derivatives thereof shall relate to the examples as oriented in the drawings. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments (examples), aspects and/or concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise. It is understood that "at least one" is equivalent to "a". The aspects (examples, alterations, modifications, options, variations, embodiments and any equivalent thereof) are described with reference to the drawings. It should be understood that the invention is limited to the subject matter provided by the claims, and that the invention is not limited to the particular aspects depicted and described.

[00020] FIG. 1 depicts a cross-sectional view of an example of a resource-transport pipeline 900.

[00021] The resource-transport pipeline 900 is also called an oil and gas pipeline, an oil pipeline, or a gas pipeline, etc. The resource-transport pipeline 900 is buried in the ground 901, and extends from below the ground 901 to above the ground 901. The resource-transport pipeline 900 defines a pipeline passageway 902. The resource-transport pipeline 900 is configured to convey (transport) goods therethrough. Liquids and gases are transported in the resource-transport pipeline 900 and any chemically stable substance may be sent through the resource-transport pipeline 900, such as gas, oil, sewage, slurry, water, crude petroleum, refined petroleum products including fuels, oil, natural gas, and/or biofuels. For the case where the resource-transport pipeline 900 includes a pneumatic tube configured to use compressed air, the resource-transport pipeline 900 may transport solid capsules

[00022] In general terms, the resource-transport pipeline 900 includes a pig receiver 904 defining a pig-receiver interior 906. The pig-receiver interior 906 is configured to receive a pig apparatus 908. The pipeline passageway 902 of the resource-transport pipeline 900 includes the pig-receiver interior 906 of the pig receiver 904.

[00023] A pig receiver 904 is configured to terminate an end section of the resource-transport pipeline 900. The pig receiver 904 is supported above the ground 901 by a support structure 903.
The pig receiver 904 defines a pig-receiver interior 906 that is in fluid communication with the pipeline passageway 902 of the resource-transport pipeline 900. The pig receiver 904 is also known as a receiving trap, a pig catcher, or a receiving station.

[00024] An isolation valve 905 is positioned in the pipeline passageway 902; the isolation valve 905 is configured to be placed in an open state and a closed state; in the open state (open condition), the pipeline passageway 902 and the pig-receiver interior 906 are in fluid communication with each other; in the closed state (closed condition), the pipeline passageway 902 and the pig-receiver interior 906 are not in fluid communication (are fluidly isolated from each other).

[00025] A pig apparatus 908 (also called a cleaning pig or a pig) is configured to be (is dimensioned to be): (A) movable through the pipeline passageway 902 of the resource-transport pipeline 900; (B) movable between the pipeline passageway 902 and the pig-receiver interior 906;
and (C) receivable in the pig-receiver interior 906 of the pig receiver 904.
The pig apparatus 908 is movable between the pipeline passageway 902 and the pig-receiver interior 906 for the case where the isolation valve 905 is in the open state; in the open state, the pipeline passageway 902 and the pig-receiver interior 906 are in fluid communication with each other. The pig apparatus 908 includes, for example, plastic disks configured to seal against the inside of the resource-transport pipeline 900. The pig apparatus 908 is configured to be propelled through the interior 902 of the resource-transport pipeline 900; as the pig apparatus 908 is propelled through the resource-transport pipeline 900, the pig apparatus 908 is configured to remove loose sedimentation or scale buildup from the inner surface of the resource-transport pipeline 900. The pig apparatus 908 may also include a magnet assembly configured to attract and remove any loose metal objects positioned in the resource-transport pipeline 900. Pigging in the context of the resource-transport pipeline 900 refers to the practice of using the pig apparatus 908 to perform various maintenance operations on the resource-transport pipeline 900. Preferably, maintenance is done without stopping the flow of the product (gas, oil, etc.) in the resource-transport pipeline 900. These operations include but are not limited to cleaning and inspecting the resource-transport pipeline 900. This is accomplished by inserting the pig apparatus 908 into a pig launcher or a launching station (both not depicted but known), which is an oversized section in the resource-transport pipeline 900 that reduces the normal diameter of the resource-transport pipeline 900. The launching station is then closed and the pressure-driven flow of the product in the resource-transport pipeline 900 is used to push the pig apparatus 908 down the resource-transport pipeline 900 until the pig apparatus 908 reaches the pig receiver 904.

[00026] A closure interface 916 and the pig receiver 904 are fixedly connectable together; for example, the closure interface 916 and the pig receiver 904 are fixedly welded together by way of a weld line 917.

[00027] A pipeline closure 914 (also called a pig closure) and the closure interface 916 are configured to be selectively sealably coupled together. For example, the pipeline closure 914 and the closure interface 916 may define threads 918 configured to permit the pipeline closure 914 and the closure interface 916 to be: (A) threadably connectable with and dis-connectable from each other (together); and (B) selectively sealable against each other once connected (coupled) together.
For the case where access to the interior of: (A) the closure interface 916, of the pig receiver 904 is required; and/or (B) the resource-transport pipeline 900 is required, it will be appreciated that the pipeline closure 914 may be selectively removed from the closure interface 916 thereby permitting access.

[00028] The closure interface 916 defines a closure interior 906. The closure interface 916 includes a vent device 910 extending from the closure interior 906. A vent valve 911 is disposed in the vent device 910, and the vent valve 911 is configured to selectively release internal pressure from the closure interior 906 to an exterior of the closure interface 916 via the vent device 910; for instance, the vent device 910 may include a tubular structure.

[00029] The closure interface 916 includes a drain device 912 extending from the closure interior 906. A drain valve 913 is disposed in the drain device 912, and the drain valve 913 is configured to selectively release accumulated fluid from the closure interior 906 to the exterior of the closure interface 916 via the drain device 912; for instance, the drain device 912 may include a tubular structure.

[00030] A safety issue associated with the resource-transport pipeline 900 is safe access to the interior of the closure interface 916, of the pig receiver 904 and/or of the resource-transport pipeline 900. The resource-transport pipeline 900 operates under pressure (when the product, such as oil, is made to move therethrough); therefore, it is important for the operator (user) of the resource-transport pipeline 900 to gain safe access to the interior of the resource-transport pipeline 900 (when required to do just so). While the isolation valve 905 is used to isolate the pressure side of the interior of the resource-transport pipeline 900 from an isolated section of the resource-transport pipeline 900, the isolated section of the resource-transport pipeline 900 still poses a safety issue to the user since the isolated section may still be internally pressurized. The vent valve 911 is configured to selectively release unwanted pressure from the isolated section of the resource-transport pipeline 900, and the drain valve 913 is configured to selectively release unwanted product from the isolated section of the resource-transport pipeline 900 (under some pressure above atmospheric pressure); therefore, removal of the pipeline closure 914 may represent a safety hazard for the user. For instance, for the case where the temperature of the interior of the isolated section of the resource-transport pipeline 900 is below the freezing of water (zero degrees centigrade), a frozen hydrate (and/or ice) is formed in the isolated section of the resource-transport pipeline 900; sometimes, the frozen hydrate inadvertently forms an unwanted temporary seal within the isolated section of the resource-transport pipeline 900 thereby forming a pressurized pocket within the isolated section of the resource-transport pipeline 900 even though the vent valve 911 and/or the drain valve 913 appear to have vented and/or drained the interior of the isolated section of the resource-transport pipeline 900. Then, when the pipeline closure 914 is opened or is removed from the closure interface 916 (by the user), the frozen hydrate warms up, and any unwanted pressure positioned behind the frozen hydrate becomes released toward the user. For the case where the user uses a tool (not depicted in FIG. 1) to manually break and/or remove the frozen hydrate, the user may inadvertently release the unwanted pressure from behind the frozen hydrate, and the unwanted pressure may inadvertently push the tool toward the user to cause injury to the user; this situation represents a safety hazard to the user of the resource-transport pipeline 900.

[00031] FIGS. 2A, 2B, 2C, 2D and 2E depict views of an example of a closure apparatus 100 for the resource-transport pipeline 900 of FIG. 1.

[00032] With reference to FIGS. 2A, 2B, 2C, and 2D, the closure apparatus 100 may be called a pig-discovery portal or a pig-discovery apparatus. With reference to FIG. 2E, the closure apparatus 100 may be called a pipeline-portal apparatus.

[00033] FIG. 2A depicts a bottom view of an example of the closure apparatus 100.

[00034] In accordance with the example depicted in FIG. 2A, the closure apparatus 100 includes: a first closure assembly 102 defining a closure channel 104, a second closure assembly 112, an interface assembly 118 defining an interface channel 119, a pivot assembly 120, a pivot support 121 (depicted in FIG. 2B), a closure-extension assembly 122 (also called a barrel assembly or a tubular assembly) defining an extension channel 124 (depicted in FIG. 3B
and FIG. 5), an arm assembly 126, a slidable-collar assembly 128 defining a collar channel 130 (depicted in FIG. 5), a stop assembly 132, a pressure-relief valve 134, a pressure-alert valve 125 (also called a back-up valve), and a chain assembly 127. The pivot support 121 is depicted in FIG.
2B. The closure-extension assembly 122 is also called a barrel assembly or a tubular assembly.
The extension channel 124 is depicted in FIG. 3B and FIG. 5). The collar channel 130 is depicted in FIG. 5. The pressure-alert valve 125 is also called a back-up valve. It will be appreciated that these assemblies may be manufactured from steel alloys, etc., and are configured to operate under a relatively higher pressure (as may be required).

[00035] Referring to FIG. 2A, the first closure assembly 102 includes an interface assembly 118 defining an interface channel 119; the interface assembly 118 is configured to interface the first closure assembly 102 with the pipeline passageway 902 of the resource-transport pipeline 900. The interface assembly 118 includes an end section 117 configured to be threadably connected to the first closure assembly 102. Generally, the first closure assembly 102 is configured to threadably interface with an end section 117 of the interface assembly 118. The first closure assembly 102 includes (defines) the first closure threads 105. The end section 117 of the interface assembly 118 includes (defines) mating threads configured to mate with the first closure threads 105 of the first closure assembly 102. The opposite end section of the interface assembly 118 is configured to be:
(A) slidably received into an end section of the resource-transport pipeline 900; and (B) fixedly attached to an end section of the resource-transport pipeline 900 (by way of a weld line 917 (depicted in FIG. 2D).

[00036] Referring to FIG. 2A, the first closure assembly 102 includes the pivot assembly 120 configured to support pivotal movement 136 of the first closure assembly 102.
The pivot assembly 120 is fixedly connected to the outer section of the interface assembly 118.
The pivot assembly 120 may include, as depicted, a sleeve component.

[00037] The first closure assembly 102 further includes the arm assembly 126 that is pivotally mounted to the pivot assembly 120. More specifically, an end portion of the arm assembly 126 is operatively pivotally mounted to the pivot assembly 120; as depicted, the arm assembly 126 is slidably received in the pivot assembly 120. The arm assembly 126 is generally U shaped (and it will be appreciated that any suitable shape may be used). Another end portion of the arm assembly 126 is fixedly attached to the slidable-collar assembly 128.

[00038] Generally, the first closure assembly 102 further includes the slidable-collar assembly 128 defining a collar channel 130 extending therethrough; the collar channel 130 is configured to slidably receive the closure-extension assembly 122; the slidable-collar assembly 128 being coupled to the arm assembly 126.

[00039] Generally, the first closure assembly 102 further includes the closure-extension assembly 122 defining an extension channel 124 extending therethrough; the closure-extension assembly 122 is attached to the first closure assembly 102; the closure-extension assembly 122 surrounds the closure channel 104 of the first closure assembly 102; the closure-extension assembly 122 extends from the first closure assembly 102; the extension channel 124 is in fluid communication with the closure channel 104 of the first closure assembly 102.

[00040] The second closure assembly 112 is configured to be selectively movable between the closed state 114 and the open state 116 relative to the extension channel 124 of the closure-extension assembly 122.

[00041] The slidable-collar assembly 128 is slidably received over the outer surface of the closure-extension assembly 122. The slidable-collar assembly 128 and the outer surface of the closure-extension assembly 122 are slide movable relative to each other. The slidable-collar assembly 128 is configured to surround the closure-extension assembly 122.

[00042] An end portion of the closure-extension assembly 122 is fixedly connected (welded) to an outer surface of the first closure assembly 102. The closure-extension assembly 122 and the first closure assembly 102 may be coaxially aligned relative to each other. The closure-extension assembly 122 defines the extension channel 124 (depicted in FIG. 5) that extends through the length of the closure-extension assembly 122 (from opposite ends thereof). The closure-extension assembly 122 (depicted in FIG. 5) surrounds the closure channel 104 (depicted in FIG. 5) in such a way that the extension channel 124 and the closure channel 104 are in fluid communication with each other. The extension channel 124 and the closure channel 104 may be coaxially aligned relative to each other. The closure channel 104 is in fluid communication with the interior of the interface assembly 118 (leading to the interior of the pig interface 906 and/or to the interior of the resource-transport pipeline 900). For instance, the closure channel 104 may be round shaped or any suitable shape.

[00043] Referring to FIG. 2A, the closure-extension assembly 122 has an end portion 123. The second closure assembly 112 is configured to threadably interface with the end portion 123 of the closure-extension assembly 122. The end portion 123 and the second closure assembly 112 are threadably connectable with each other. The second closure assembly 112 defines internal threads 115 that mate with the external threads defined at the end portion 123 of the closure-extension assembly 122. The end portion 123 of the closure-extension assembly 122 includes (defines) mating threads configured to mate with the internal threads 115 of the second closure assembly 112.

[00044] The pressure-relief valve 134 is fixedly mounted to the closure-extension assembly 122, and is positioned proximate to the second closure assembly 112. The pressure-relief valve 134 is in selective fluid communication with the extension channel 124 of the closure-extension assembly 122 (as depicted in FIG. 3B). Before the second closure assembly 112 is removed from the closure-extension assembly 122, the user may depressurize the extension channel 124 of the closure-extension assembly 122 by using the pressure-relief valve 134. The pressure-relief valve 134 is configured to selectively de-pressurize the extension channel 124 of the closure-extension assembly 122.

[00045] Referring to FIG. 2A, the first closure assembly 102 further includes a stop assembly 132 extending from the closure-extension assembly 122; the stop assembly 132 is configured to stop movement of the slidable-collar assembly 128 along the closure-extension assembly 122.
More specifically, the stop assembly 132 is fixedly connected to the outer surface of the closure-extension assembly 122, and is positioned between the pressure-relief valve 134 and the slidable-collar assembly 128. The stop assembly 132 extends around the closure-extension assembly 122.

The stop assembly 132 is configured to prevent inadvertent damage to the pressure-relief valve 134 and/or to the second closure assembly 112. The stop assembly 132 is configured to stop movement of the slidable-collar assembly 128 along the closure-extension assembly 122 in such a way that the slidable-collar assembly 128 does not interfere with operation of the pressure-relief valve 134.

[00046] Generally, the first closure assembly 102 further includes the pressure-relief valve 134 that is operative coupled to the closure-extension assembly 122, and is configured to selectively relieve pressure from the extension channel 124 of the closure-extension assembly 122.

[00047] The first closure assembly 102 includes a first closure lug 103 (also called a handle).
Three instances of the first closure lug 103 radially extend from the outer surface of the first closure assembly 102. The user may grasp the first closure lug 103 and rotate the first closure assembly 102 in order to (threadably) disconnect or to remove the first closure assembly 102 from the interface assembly 118 in order to gain access to the interior of the interface assembly 118 (leading into the pig receiver 904). The first closure assembly 102 is configured to be rotatably removed from the interface assembly 118, and rotatably connected (and sealed) to the interface assembly 118. A seal assembly may be mounted or positioned between the first closure assembly 102 and the interface assembly 118.

[00048] The second closure assembly 112 includes a second closure lug 113 (also called a handle). Three instances of the second closure lug 113 radially extend from the outer surface of the second closure assembly 112. The user may grasp the second closure lug 113 and rotate the second closure assembly 112 in order to (threadably) disconnect or to remove the second closure assembly 112 from the closure-extension assembly 122 in order to gain access to the interior of the closure-extension assembly 122 leading into the closure channel 104 (as depicted in FIG. 3C) of the first closure assembly 102. The second closure assembly 112 is configured to be rotatably removed from the closure-extension assembly 122, and rotatably connected (and sealed) to the closure-extension assembly 122. A seal assembly may be mounted or positioned between the second closure assembly 112 and the closure-extension assembly 122.

[00049] The first closure assembly 102 is configured to operate in: (A) a closed position 108 (depicted in FIGS. 2A, 2C, 4A, 4C, 5, 6, 7A, 7B, 7C, 8, 11, and 12); and (B) an open position 110 (depicted in FIGS. 2B, 2D, 2E, 4B, 9, and 10).

[00050] The second closure assembly 112 is configured to operate in: (A) a closed state 114 (depicted in FIGS. 2A, 2B, 2C, 2D, 2E, 4A, 4B, 5, and 12); and (B) an open state 116 (depicted in FIGS. 4C, 6, 7A, 7B, 7C, 8, 9, 10, and 11).

[00051] In view of the above description (in general terms), the closure apparatus 100 is for the resource-transport pipeline 900 that defines the pipeline passageway 902. The closure apparatus 100 includes a first closure assembly 102 defining a closure channel 104 extending therethrough.
The first closure assembly 102 is configured to be selectively movable between the closed position 108 and the open position 110 relative to the pipeline passageway 902 of the resource-transport pipeline 900. The closure apparatus 100 also includes a second closure assembly 112 configured to be selectively movable between a closed state 114 and an open state 116 relative to the closure channel 104 of the first closure assembly 102.

[00052] In view of the above description (in general terms), the closure apparatus 100 is for the resource-transport pipeline 900 that defines the pipeline passageway 902. The closure apparatus 100 includes a first closure assembly 102 configured to selectively cover the pipeline passageway 902 of the resource-transport pipeline 900. The first closure assembly 102 defines a closure channel 104 extending through the first closure assembly 102 in such a way that the closure channel 104 is in fluid communication with the pipeline passageway 902 once the first closure assembly 102 is positioned to cover (and/or close) the pipeline passageway 902. The closure apparatus 100 also includes a second closure assembly 112 configured to selectively sealably cover the closure channel 104 of the first closure assembly 102 once the second closure assembly 112 is positioned to cover (and/or close) the closure channel 104.

[00053] More specifically, the first closure assembly 102 is configured to be selectively movable between a closed position 108 and an open position 110 relative to the pipeline passageway 902 of the resource-transport pipeline 900. In the closed position 108, the first closure assembly 102 is closable against the pipeline passageway 902 of the resource-transport pipeline 900, and permits limited user access to the pipeline passageway 902 via the closure channel 104. In the open position 110, the first closure assembly 102 is movable away from the pipeline passageway 902 of the resource-transport pipeline 900, and permits additional user access to the pipeline passageway 902.

[00054] More specifically, the second closure assembly 112 is configured to be selectively movable between a closed state 114 and an open state 116 relative to the closure channel 104 of the first closure assembly 102. In the closed state 114, the second closure assembly 112 is sealably closable against the closure channel 104 of the first closure assembly 102, and prevents user access to the pipeline passageway 902 via the closure channel 104. In the open state 116, the second closure assembly 112 is movable away from the closure channel 104 of the first closure assembly 102, and permits user access to the pipeline passageway 902 via the closure channel 104.

[00055] FIG. 2B depicts a front view of an example of the closure apparatus 100.

[00056] The interface assembly 118 is: (A) received (at least in part) in the interior defined by the pig receiver 904 (as depicted in FIG. 2B and FIG. 2D); and (B) extends (at least in part) from the pig receiver 904 (as depicted in FIG. 2D).

[00057] The pivot support 121 connects the pivot assembly 120 to the interface assembly 118.
The pivot support 121 extends from an end portion of the interface assembly 118 (as depicted in FIGS. 2B and 2D). The pivot assembly 120 is fixedly connected to the pivot support 121.

[00058] As depicted in FIG. 2B, the arm assembly 126 is U shaped; the arm assembly 126 has one end that is pivotally connected to the pivot assembly 120, and has another end that is fixedly connected to the slidable-collar assembly 128. The first closure assembly 102 contacts (abuts) and rests on the slidable-collar assembly 128. The weight of the first closure assembly 102, the closure-extension assembly 122 and the second closure assembly 112 are supported by the arm assembly 126 and the slidable-collar assembly 128.

[00059] As depicted in FIG. 2B, once the first closure assembly 102 is disconnected from the interface assembly 118, the user may have access to the interior of the pig receiver 904 in order to gain access to the pig apparatus 908 (when required).

[00060] FIG. 2C depicts a side view of an example of the closure apparatus 100.

[00061] The pressure-alert valve 125 is mounted to an outer surface of the interface assembly 118 at an end section of the interface assembly 118. The pressure-alert valve 125 is configured to depressurize the interior of the interface assembly 118. The chain assembly 127 is configured to couple the pressure-alert valve 125 to the first closure assembly 102.

[00062] FIG. 2D depicts a side view of an example of the closure apparatus 100.

[00063] The first closure assembly 102, the closure-extension assembly 122, the second closure assembly 112, the stop assembly 132, and the slidable-collar assembly 128 are coaxially aligned relative to each other.

[00064] More specifically, the first closure assembly 102 is configured to be selectively movable between the closed position 108 and the open position 110 relative to the pig-receiver interior 906 of the pig receiver 904 of the pipeline passageway 902 of the resource-transport pipeline 900.

[00065] More specifically, the closure channel 104 of the first closure assembly 102 is configured to permit access to the pig apparatus 908 received in the pig-receiver interior 906 of the pig receiver 904 of the resource-transport pipeline 900 once the first closure assembly 102 is selectively moved from the closed position 108 to the open position 110 relative to the pig-receiver interior 906 of the pig receiver 904.

[00066] More specifically, the first closure assembly 102 includes the interface assembly 118 that is configured to interface the first closure assembly 102 with the pig-receiver interior 906 of the pig receiver 904 of the resource-transport pipeline 900.

[00067] FIG. 2E depicts a side view of an example of the closure apparatus 100.

[00068] With reference to FIG. 2E, the closure apparatus 100 may be called a pipeline portal apparatus. As depicted in FIG. 2E, once the first closure assembly 102 is disconnected from the interface assembly 118, the user may have access to the interior of the pig receiver 904 in order to gain access to the interior 902 of the resource-transport pipeline 900 (when required).

[00069] FIGS. 3A, 3B, 3C and 3D depict views of examples of a closure apparatus 100 for the resource-transport pipeline 900 of FIG. 1.

[00070] FIG. 3A depicts an end view of an example of the closure apparatus 100.

[00071] As depicted in FIG. 3A, the second closure assembly 112 is threadably sealably connected to the end portion of the closure-extension assembly 122.

[00072] FIG. 3B depicts an end view of an example of the closure apparatus 100.

[00073] As depicted in FIG. 3B, the second closure assembly 112 of FIG. 3A
has been removed to reveal the extension channel 124 of the closure-extension assembly 122. A
gasket 129 is mounted to the end section of the closure-extension assembly 122, and surrounds the extension channel 124. The pressure-relief valve 134 is in selective fluid communication with the extension channel 124 of the closure-extension assembly 122.

[00074] FIG. 3C depicts an end view of an example of the closure apparatus 100.

[00075] As depicted in FIG. 3C, the pivot support 121 is connected to the interface assembly 118. The pivot assembly 120 is fixedly mounted to the pivot support 121. The arm assembly 126 is pivotally mounted to the pivot assembly 120.

[00076] FIG. 3D depicts an end view of an example of the closure apparatus 100.

[00077] As depicted in FIG. 3D, the first closure assembly 102 is disconnected from the interface assembly 118 of FIG. 3C.

[00078] FIGS. 4A, 4B, and 4C depict views of examples of a closure apparatus 100 for the resource-transport pipeline 900 of FIG. 1.

[00079] FIG. 4A depicts a side view of an example of the closure apparatus 100.

[00080] As depicted in FIG. 4A, the closure apparatus 100 is depicted as aligned horizontally (relative to the ground). FIG. 4A depicts the first closure assembly 102 sealably connected with the interface assembly 118, and the second closure assembly 112 sealably connected with the closure-extension assembly 122. To disconnect the first closure assembly 102 from the interface assembly 118, the first closure assembly 102 is rotated along a rotation movement 135.
To disconnect the second closure assembly 112 from the closure-extension assembly 122, the second closure assembly 112 is rotated along a rotation movement 135. Once the first closure assembly 102 has been disconnected from the interface assembly 118, the arm assembly 126 may be pivotally moved along a pivotal movement 136.

[00081] FIG. 4B depicts a side view of an example of the closure apparatus 100.

[00082] As depicted in FIG. 4B, the first closure assembly 102 is disconnected from the interface assembly 118 (in such a way that the user may have access to the interior of the interface assembly 118), and the second closure assembly 112 is sealably connected with the closure-extension assembly 122. The arm assembly 126 is pivotally moved in such a way that the closure-extension assembly 122 is aligned vertically relative to the ground. The first closure assembly 102 touches or abuts the slidable-collar assembly 128. The weight of the closure apparatus 100 is supported by the pivot assembly 120 and the arm assembly 126.

[00083] FIG. 4C depicts a side view of an example of the closure apparatus 100.

[00084] As depicted in FIG. 4C, the first closure assembly 102 is sealably connected with the interface assembly 118, and the second closure assembly 112 is disconnected from the closure-extension assembly 122 in such a way that the user may have access to the interior of the closure-extension assembly 122.

[00085] FIGS. 5, 6, 7A, 7B, 7C, 8, 9, 10, 11 and 12 depict cross-sectional side views of examples of a closure apparatus 100 for the resource-transport pipeline 900 of FIG. 1.

[00086] FIG. 5 depicts a side view of an example of the closure apparatus 100.

[00087] The first closure assembly 102 is depicted in the closed position 108, and the second closure assembly 112 is depicted in the closed state 114. Before the second closure assembly 112 is removed from the closure-extension assembly 122, the user of the closure apparatus 100 uses the pressure-relief valve 134 to release pressure from the extension channel 124 of the closure-extension assembly 122. Once the internal pressure from the extension channel 124 is released, then the second closure assembly 112 may be removed from the closure-extension assembly 122.
The second closure assembly 112 is threadably engaged with the end section of the closure-extension assembly 122 via first closure threads 105. The second closure assembly 112 is rotated to remove the second closure assembly 112 from the closure-extension assembly 122.

[00088] FIG. 6 depicts a side view of an example of the closure apparatus 100.

[00089] The first closure assembly 102 is depicted in the closed position 108, and the second closure assembly 112 is depicted in the open state 116. Since the internal pressure from the extension channel 124 of the closure-extension assembly 122 has been removed, it is safe for the user to gain user access to the extension channel 124.

[00090] FIG. 7A depicts a side view of an example of the closure apparatus 100.

[00091] A discovery tool 920 is inserted into the extension channel 124 of the closure-extension assembly 122 (from the open end of the closure-extension assembly 122). The discovery tool 920 includes an elongated shaft and/or a handle having a hook or grasping mechanism attached to a distal end thereof.

[00092] FIG. 7B depicts a side view of an example of the closure apparatus 100.

[00093] The user 922 is depicted as grasping a proximal end of the discovery tool 920. The discovery tool 920 is inserted along the extension channel 124 of the closure-extension assembly 122, into and along the closure channel 104 of the first closure assembly 102, and through the interior 119 of the interface assembly 118. The user 922 pushes or urges the discovery tool 920 against the frozen hydrate 924 (also called ice) with enough force in such a way as to break the frozen hydrate 924 apart; then, once the frozen hydrate 924 is broken, the pressure behind the frozen hydrate 924 is released and may escape to the atmosphere (exterior of the closure apparatus 100) via the interior 119 of the interface assembly 118, along the closure channel 104 of the first closure assembly 102, and along the extension channel 124 of the closure-extension assembly 122.
The closure channel 104 of the first closure assembly 102 is of a size that permits the discovery tool 920 to move therein without interference. The user 922 should use caution while inserting and/or removing the discovery tool 920 into the extension channel 124 of the closure-extension assembly 122 by not standing directly behind the discovery tool 920 (in case the discovery tool 920 is inadvertently or accidentally moved toward the user 922).

[00094] FIG. 7C depicts a side view of an example of the closure apparatus 100.

[00095] Once the user is satisfied that the frozen hydrate 924 has been broken and the pressure behind the frozen hydrate 924 has been dissipated (as depicted in FIG. 7B), the user may then use the discovery tool 920 to hook and move the pig apparatus 908 towards the first closure assembly 102 (if so desired).

[00096] FIG. 8 depicts a side view of an example of the closure apparatus 100.

[00097] The first closure assembly 102 exists in the closed position 108.
The first closure assembly 102 is removed or disconnected from the interface assembly 118 by rotation; in this way the first closure assembly 102 may be threadably disconnected from the interface assembly 118. In this manner, the user may gain access to the interior 119 of the interface assembly 118.

[00098] FIG. 9 depicts a side view of an example of the closure apparatus 100.

[00099] FIG. 9 depicts the first closure assembly 102 in the open position 110. The arm126 is pivoted via the pivot assembly 120 so that the arm assembly 126 may be rotated and the first closure assembly 102 becomes displaced from the entrance of the interface assembly 118; in this way, the user may gain access to the interior 119 of the interface assembly 118. The user 922 may remove the pig apparatus 908 from the pig receiver 904 (as depicted in FIG. 9 or FIG. 2D) and/or may gain access to the interior 902 of the resource-transport pipeline 900 (as depicted in FIG. 2E).
The weight of the first closure assembly 102 and the closure-extension assembly 122, etc., is supported by the pivot assembly 120 and the arm assembly 126. As depicted in FIG. 9, the first closure assembly 102 abuts the slidable-collar assembly 128.

[000100] FIG. 10 depicts a side view of an example of the closure apparatus 100.

[000101] FIG. 10 depicts the first closure assembly 102 in an offline position relative to the interface assembly 118. Once the user no longer needs user access to the interior 119 of the interface assembly 118, the arm assembly 126 may be pivoted in such a way that the first closure assembly 102 may be positioned coaxially (in an inline position) relative to the interface assembly 118.

[000102] FIG. 11 depicts a side view of an example of the closure apparatus 100.

[000103] The first closure assembly 102 is positioned coaxially in the inline position relative to the interface assembly 118. The first closure assembly 102 is rotated in such a way as to become threadably sealably engaged (operatively connected) with the interface assembly 118 thereby moving the first closure assembly 102 from the open position 110 (depicted in FIG. 10) to the closed position 108 (as depicted in FIG. 11). For example, the closure-extension assembly 122 may be rotated while the first closure assembly 102 is rotated since the closure-extension assembly 122 is fixedly connected to the first closure assembly 102.

[000104] FIG. 12 depicts a side view of an example of the closure apparatus 100.

[000105] The second closure assembly 112 is installed to the distal end of the closure-extension assembly 122 in such a way that the second closure assembly 112 is threadably sealably connected to the closure-extension assembly 122.

[000106] In general terms (with reference to FIGS. 5 to 12), there is described a method of operating the closure apparatus 100 for the resource-transport pipeline 900 defining the pipeline passageway 902. The method includes: (A) selectively moving the first closure assembly 102 defining the closure channel 104 extending therethrough between the closed position 108 and the open position 110 relative to the pipeline passageway 902 of the resource-transport pipeline 900;
and (B) selectively moving the second closure assembly 112 between the closed state 114 and the open state 116 relative to the closure channel 104 of the first closure assembly 102.

[000107] in general terms, (with reference to FIGS. 5 to 12), there is described a method of operating the closure apparatus 100 for the resource-transport pipeline 900 defining the pipeline passageway 902. The method includes selectively covering the pipeline passageway of the resource-transport pipeline with a first closure assembly defining a closure channel extending through the first closure assembly in such a way that the closure channel is in fluid communication with the pipeline passageway once the first closure assembly is positioned to cover the pipeline passageway. The method also includes selectively sealably covering the closure channel of the first closure assembly with a second closure assembly once the second closure assembly is positioned to cover the closure channel.

[000108] In accordance with an option, the resource-transport pipeline 900 includes the closure apparatus 100.

[000109] This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to make and use the invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

[000110] It may be appreciated that the assemblies and modules described above may be connected with each other as may be required to perform desired functions and tasks that are within the scope of persons of skill in the art to make such combinations and permutations without having to describe each and every one of them in explicit terms. There is no particular assembly, or components, that are superior to any of the equivalents available to the art.
There is no particular mode of practicing the disclosed subject matter that is superior to others, so long as the functions may be performed. It is believed that all the crucial aspects of the disclosed subject matter have been provided in this document. It is understood that the scope of the present invention is limited to the scope provided by the independent claim(s), and it is also understood that the scope of the present invention is not limited to: (i) the dependent claims, (ii) the detailed description of the non-limiting embodiments, (iii) the summary, (iv) the abstract, and/or (v) the description provided outside of this document (that is, outside of the instant application as filed, as prosecuted, and/or as granted). It is understood, for the purposes of this document, that the phrase "includes" is equivalent to the word "comprising." It is noted that the foregoing has outlined the non-limiting embodiments (examples). The description is made for particular non-limiting embodiments (examples). It is understood that the non-limiting embodiments are merely illustrative as examples.

Claims (21)

WE CLAIM:

1. A closure apparatus for a resource-transport pipeline defining a pipeline passageway, the closure apparatus comprising:
a first closure assembly being configured to selectively cover the pipeline passageway of the resource-transport pipeline, and the first closure assembly defining a closure channel extending through the first closure assembly in such a way that the closure channel is in fluid communication with the pipeline passageway once the first closure assembly is positioned to cover the pipeline passageway; and a second closure assembly being configured to selectively sealably cover the closure channel of the first closure assembly once the second closure assembly is positioned to cover the closure channel.

2. The closure apparatus of claim 1, wherein:
the first closure assembly is configured to be selectively movable between a closed position and an open position relative to the pipeline passageway of the resource-transport pipeline;
the second closure assembly is configured to be selectively movable between a closed state and an open state relative to the closure channel of the first closure assembly;
in the closed position, the first closure assembly is closable against the pipeline passageway of the resource-transport pipeline, and permits limited user access to the pipeline passageway via the closure channel;
in the open position, the first closure assembly is movable away from the pipeline passageway of the resource-transport pipeline, and permits additional user access to the pipeline passageway;
in the closed state, the second closure assembly is sealably closable against the closure channel of the first closure assembly, and prevents user access to the pipeline passageway via the closure channel; and in the open state, the second closure assembly is movable away from the closure channel of the first closure assembly, and permits user access to the pipeline passageway via the closure channel.

3. The closure apparatus of claim 1, wherein:
the first closure assembly is configured to be selectively movable between a closed position and an open position relative to the pipeline passageway of the resource-transport pipeline;
the second closure assembly is configured to be selectively movable between a closed state and an open state relative to the closure channel of the first closure assembly;
in the closed position, the first closure assembly closes the pipeline passageway of the resource-transport pipeline;
in the open position, the first closure assembly is moved away from the pipeline passageway of the resource-transport pipeline;
in the closed state, the second closure assembly sealably closes the closure channel of the first closure assembly; and in the open state, the second closure assembly is moved away from the closure channel of the first closure assembly.

4. The closure apparatus of claim 1, wherein:
the first closure assembly includes:
an interface assembly defining an interface channel, and the interface assembly being configured to interface the first closure assembly with the pipeline passageway of the resource-transport pipeline.

5. The closure apparatus of claim 4, wherein:
the first closure assembly is configured to threadably interface with an end section of the interface assembly.

6. The closure apparatus of claim 1, wherein:
the first closure assembly includes:
a closure-extension assembly defining an extension channel extending therethrough, the closure-extension assembly being attached to the first closure assembly, the closure-extension assembly surrounding the closure channel of the first closure assembly, the closure-extension assembly extending from the first closure assembly, and the extension channel being in fluid communication with the closure channel of the first closure assembly.

7. The closure apparatus of claim 6, wherein:
the second closure assembly is configured to be selectively movable between a closed state and an open state relative to the extension channel of the closure-extension assembly.

8. The closure apparatus of claim 7, wherein:
the second closure assembly is configured to threadably interface with an end portion of the closure-extension assembly.

9. The closure apparatus of claim 1, wherein:
the first closure assembly includes:
a pivot assembly being configured to support pivotal movement of the first closure assembly.

10. The closure apparatus of claim 4, wherein:
the first closure assembly includes:
a pivot assembly being configured to support pivotal movement of the first closure assembly; and a pivot support connecting the pivot assembly to the interface assembly.

11. The closure apparatus of claim 9, wherein:
the first closure assembly further includes:
a closure-extension assembly defining an extension channel extending therethrough, the closure-extension assembly being attached to the first closure assembly, the closure-extension assembly surrounding the closure channel of the first closure assembly, the closure-extension assembly extending from the first closure assembly, and the extension channel being in fluid communication with the closure channel of the first closure assembly.

12. The closure apparatus of claim 11, wherein:
the first closure assembly further includes:
an arm assembly being pivotally mounted to the pivot assembly.

13. The closure apparatus of claim 12, wherein:
the first closure assembly further includes:
a slidable-collar assembly defining a collar channel extending therethrough, the collar channel being configured to slidably receive the closure-extension assembly, and the slidable-collar assembly being coupled to the arm assembly.

14. The closure apparatus of claim 13, wherein:
the first closure assembly further includes:
a stop assembly extending from the closure-extension assembly, and the stop assembly being configured to stop movement of the slidable-collar assembly along the closure-extension assembly.

15. The closure apparatus of claim 11, wherein:
the first closure assembly further includes:

a pressure-relief valve being operatively coupled to the closure-extension assembly, and being configured to selectively relieve pressure from the extension channel of the closure-extension assembly.

16. The closure apparatus of claim 13, wherein:
the first closure assembly further includes:
a pressure-relief valve being operatively coupled to the closure-extension assembly, and being configured to selectively relieve pressure from the extension channel of the closure-extension assembly; and a stop assembly extending from the closure-extension assembly, and the stop assembly being configured to stop movement of the slidable-collar assembly along the closure-extension assembly in such a way that the slidable-collar assembly does not interfere with operation of the pressure-relief valve.

17. The closure apparatus of claim 1, wherein:
the resource-transport pipeline includes a pig receiver defining a pig-receiver interior, and the pig-receiver interior is configured to receive a pig apparatus;
the pipeline passageway of the resource-transport pipeline includes the pig-receiver interior of the pig receiver; and the first closure assembly is configured to be selectively movable between a closed position and an open position relative to the pig-receiver interior of the pig receiver of the pipeline passageway of the resource-transport pipeline.

18. The closure apparatus of claim 17, wherein:
the closure channel of the first closure assembly is configured to permit access to the pig apparatus received in the pig-receiver interior of the pig receiver of the resource-transport pipeline once the first closure assembly is selectively moved from the closed position to the open position relative to the pig-receiver interior of the pig receiver.

19. The closure apparatus of claim 18, wherein:
the first closure assembly includes:
an interface assembly being configured to interface the first closure assembly with the pig-receiver interior of the pig receiver of the resource-transport pipeline.

20. A resource-transport pipeline defining a pipeline passageway, the resource-transport pipeline comprising:
a closure apparatus, including:
a first closure assembly defining a closure channel extending therethrough, and the first closure assembly being configured to be selectively movable between a closed position and an open position relative to the pipeline passageway of the resource-transport pipeline;
and a second closure assembly being configured to be selectively movable between a closed state and an open state relative to the closure channel of the first closure assembly.

21. A method of operating a closure apparatus for a resource-transport pipeline defining a pipeline passageway, the method comprising:
selectively covering the pipeline passageway of the resource-transport pipeline with a first closure assembly defining a closure channel extending through the first closure assembly in such a way that the closure channel is in fluid communication with the pipeline passageway once the first closure assembly is positioned to cover the pipeline passageway;
and selectively sealably covering the closure channel of the first closure assembly with a second closure assembly once the second closure assembly is positioned to cover the closure channel.