An assembly is provided that includes first and second end plates adapted to be coaxially aligned when in use. One or more members extend from the end plates or an annular ring, the annular ring provided between the end plates, the other of the end plates or annular ring comprising one or more first slots at one end thereof to be aligned with and for receiving the one or more members of the first end plate, and one or more second slots at the other end thereof to be aligned with and for receiving the one or more members. Resilient sealing members are provided around the one or more members between the end plates and annular ring, and an urging mechanism urges the first and second end plates towards the annular ring to deform the first and second resilient sealing members to engage the inner wall of the pipe.

A welding accessory tool for thin walled pipes includes a bolt, a first hub, a second hub, and a plurality of arm assemblies. Each of the plurality of arm assemblies that is radially positioned around the first hub and second hub includes a first arm section, a flat arm section, and a second arm section. The first arm section is hingedly mounted to the flat arm section and the second arm section. The first arm section and the second arm section are terminally positioned opposite of each other about the flat arm section. The first arm section is hingedly mounted to the first hub. The second arm section is hingedly mounted to the second hub. The first hub is concentrically positioned around the bolt. The second hub is threadedly engaged with the bolt thus enabling the arm assemblies to expand and collapse through rotational movement of the bolt.

Embodiments relate generally to systems and methods for decommissioning a pipeline. The system may comprise a mechanical assembly and chemical assembly. The mechanical assembly may include a main body and contact assembly. When the mechanical assembly is provided in the pipeline, the contact assembly is configurable to contact with the pipeline's interior wall. The chemical assembly may be arranged serially in line with the mechanical assembly. The chemical assembly may include a front section having a cross-sectional portion configurable to resemble the cross-section of the pipeline. The chemical assembly may also include a rear section having a cross-sectional portion. The front and rear sections may be arranged in such a way that, when the chemical assembly is provided in the pipeline, the cross-sectional portions of the front and rear sections cooperate with the pipeline's interior wall to form a chamber operable to receive and house a removal medium.

System and method for decommissioning a pipeline. The system comprises mechanical and chemical assemblies. The mechanical assembly includes a main body and a contact assembly. When the mechanical assembly is provided in the pipeline, the contact assembly is configurable to contact with the interior wall of the pipeline. The chemical assembly is arranged serially in line with the mechanical assembly. The chemical assembly includes a front section having a cross-sectional portion and a rear section having a cross-sectional portion. The front and the rear section are arranged in such a way that the cross-sectional portions of the front and the rear section cooperate with the interior wall of the pipeline to form a chamber to house a removal medium. The system and method can effectively and efficiently remove most or all of such residual mercury and/or other toxic substance from the interior wall of the pipeline before abandonment.

Apparatuses and methods for repairing a defect in a nuclear reactor are provided. The apparatus includes a body for insertion in a tubular structure, the body includes: an end effector having a weld torch operable to deposit weld material by forming molten weld droplets and depositing the weld droplets the tubular structure. A drive unit includes a brace for selectively anchoring against said tubular structure; at least one linear actuator for moving the apparatus relative to the brace; and a rotational actuator coupled to rotate the weld torch. The method includes inserting a repair apparatus into tubular structure of the nuclear reactor; moving the repair apparatus to a defect location; depositing a protective weld layer over the defect by sequentially depositing weld droplets atop a weld pool on the tubular structure, wherein the protective weld layer bonds to the tubular structure surrounding the defect.

A method of aligning first and second pipes end-to-end in a position ready for welding. Each pipe has an end bevelled with a shape scanned and stored in memory of a control unit. At least one of the pipes has machine readable codes distributed around their circumference of the pipe. The method includes effecting relative movement of the ends of the first and second pipes towards each other, reading at least one of the codes with a reader, and ascertaining the relative movement required to align the pipes in accordance with a target orientation. The relative movement is ascertained with information provided by the read code and the shapes of the bevelled ends stored in the control unit memory. In other aspects, a closed loop control method and machine-learning may be used to align the pipes. A pipe-laying vessel including pipe handling equipment and the control unit is also provided.

A weld system for welding two pipes includes a frame, a plurality of rollers, a drive motor, a brake system, an inspection detector, a weld torch, one or more battery cells and one or more processors. The frame is configured to be placed within the pipes. The plurality of rollers is configured to rotatably support the frame. The drive motor drives the rollers to move the frame within the pipes. The brake system secures the frame from movement at a desired location within the pipes. The weld torch, the inspection detector and the one or more battery cells are carried by the frame. The inspection detector is configured to detect a characteristic of an interface region between the pipes. The one or more battery cells are configured to power the drive motor, the inspection detector and the weld torch.

Method and device for centering and temporary fixation of tube parts (1, 5) in relation to each other's interior surfaces. A first tool (9) is centered relative to a tube part interior surface (2, 6) by a radially adjustable centering mechanism (13). The centering mechanism (13) is insertable in the tube part (1, 5). A second tool (10) is centered relative to the first tool (9), by a guiding mechanism (15) which cooperates for centering of the tools (9, 10) relative to one another. The second tool comprises fixing mechanism (17) to fix the exterior surface of the tube part (1, 5) to the second tool (10), and at least one third guide (18) which centers two such second tools (10) relative to one another in their mounted position on respective tube part end (4, 8) and at least one coupling member (19) to connect the two second tools (10).

A pair of separators is overlapped and placed on a base jig and thereby positioned with each other. Respective through-holes thereof are positioned to the position of a pin hole provided in the base jig. When a main jig is pressed against the base jig to clamp the pair of separators, and a pin of a sub-jig is inserted into the pin hole to clamp the pair of separators by a head, an annular light guiding path is formed by a gap generated between an opening provided in the main jig and the head of the sub-jig, and hence a laser welding position which surrounds the through-holes is exposed. The surrounding of each through-hole is seamlessly laser-welded when the laser welding position is irradiated with a laser beam.

Embodiments relate generally to systems and methods for decommissioning a pipeline. The system may comprise a mechanical assembly and chemical assembly. The mechanical assembly may include a main body and contact assembly. When the mechanical assembly is provided in the pipeline, the contact assembly is configurable to contact with the pipeline's interior wall. The chemical assembly may be arranged serially in line with the mechanical assembly. The chemical assembly may include a front section having a cross-sectional portion configurable to resemble the cross-section of the pipeline. The chemical assembly may also include a rear section having a cross-sectional portion. The front and rear sections may be arranged in such a way that, when the chemical assembly is provided in the pipeline, the cross-sectional portions of the front and rear sections cooperate with the pipeline's interior wall to form a chamber operable to receive and house a removal medium.