A patch for a pipe includes a patch body that has an outer surface and an inner surface. The patch body is curved to correspond to the curvature of a pipe that may include a defect that is desired to be sealed. A plug extends from the inner surface of the patch and the plug is configured to fit within the defect while the inner surface of the patch is in contact with an outer diameter of the pipe. The patch is adhered to the pipe using a primer and an adhesive that is applied to the outer diameter of the pipe surrounding the defect, the inner surface of the patch, or to both surfaces. Attachment straps may wrap around the pipe and the patch as the adhesive sets to maintain contact between the pipe and the patch.

The injector assembly device disclosed herein provides a rapid and inexpensive way to seal leaks in bolted tanks, without having to drain the tank. Leaks occur over time either between the overlapping tank panels, around the tank bolts or a combination of both. It is a very costly and time-consuming process to drain tanks in order to repair such leaks. The device disclosed can therefore find application specifically in field of bolted tanks, but also in numerous different applications when a water tight seal is required between two pieces of material that are bolted together.

The present invention provides leakage plugging devices and methods for sealing a leakage at a remote site in a pipe, the device including a porous carrier plug of a deformable material including pores and at least one sealant composition disposed in the pores, wherein the porous carrier plug is adapted to transport the at least one sealant composition from a first site to a remote site and to plug the leakage at the remote site.

A trap door cap for sealing around a trap door of a trap is disclosed. The canister includes a closed end and side walls extending from the closed end, wherein the side walls and the closed end together define a cup-shaped body having an open end opposite the closed end. The trap door cap further includes a seal configured to selectively apply a pressure-tight seal around an exterior surface of the trap at a longitudinal location of the trap inward of the trap door and a pressure-tight connection between the seal and the open end of the cup-shaped body, wherein the side walls, the closed end, the seal, and the pressure-tight connection together form a pressure-tight inner volume within the canister.

An assembly to plug a leak in a flowline includes a plug configured to plug the leak in the flowline, which includes a circumferential surface and a longitudinal axis. A plug insertion subassembly supports the plug. The plug insertion subassembly can move the plug between the circumferential surface and the longitudinal axis of the flowline. An axial positioning subassembly supports the plug insertion subassembly. The axial positioning subassembly can move the plug insertion subassembly along the longitudinal axis of the flowline. A chain-operated rotational positioning subassembly supports the axial positioning subassembly. The rotational positioning subassembly can be attached to the flowline with the leak. The rotational positioning subassembly is movable and can move the axial positioning subassembly on the circumferential surface of the flowline.

Methods of sealing tubulars are disclosed herein, which methods may include: providing a patch plug assembly that includes: a shaft; a wedge coupled to the shaft; a slip coupled to the shaft; a plug slidably coupled to the wedge; and a ferrule disposed between the wedge and the plug; pushing the slip against the tubular; pushing the plug against the ferrule after the slip is pushed against the tubular; pushing the ferrule against the wedge after the plug is pushed against the ferrule; and pushing a plug portion of the plug against an inner surface of the tubular.

An assembly to plug a leak in a flowline includes a plug configured to plug the leak in the flowline, which includes a circumferential surface and a longitudinal axis. A plug insertion subassembly supports the plug. The plug insertion subassembly can move the plug between the circumferential surface and the longitudinal axis of the flowline. An axial positioning subassembly supports the plug insertion subassembly. The axial positioning subassembly can move the plug insertion subassembly along the longitudinal axis of the flowline. A chain-operated rotational positioning subassembly supports the axial positioning subassembly. The rotational positioning subassembly can be attached to the flowline with the leak. The rotational positioning subassembly is movable and can move the axial positioning subassembly on the circumferential surface of the flowline.

The invention relates to a sealing device with a longitudinal axis for plugging a leak in the wall of a pipe or tank, further comprising a drive means at one end, a plug and a tap. According to the main features, at its other end the device comprises a drilling head suitable for drilling a cylindrical hole in the thickness of the wall at the location of the leak, the plug comprises a thread and a thread runout chamfer on which the thread ends, the end of the thread extending to a clearance groove and a smooth upper chamfer suitable for deforming the thread at the end of internal thread, the hole being intended to be sealed by the plug.

The invention also relates to a method for sealing a leak in the wall of a pipe or tank.

A sealing element (10) for use in a fluid-carrying pipeline (16) comprising a substantially central core (14) surrounded by a coating (12). The outer coating (12) is adapted to perform a partial extrusion through an opening (15) in a pipeline wall (16) to seal the opening (15). The density of the sealing element (10) is substantially the same as the density of the fluid (11) in the pipeline (16). The coating (12) comprises a two-part epoxy putty, and the core (14) is formed from a deformable material. A method of making the sealing element is also disclosed.

A temporary trap door cap device for sealing around a pressure-leaking trap door at an end of a pipeline terminating in a trap includes a canister formed from a longitudinally extending pipe having an open end and a closed end; and an annular rim connected to the open end, with an inner diameter smaller than an inner diameter of the canister. The annular rim is configured such that the inner diameter of the annular rim fits over the trap door of the trap terminating the pipeline. After the annular rim has passed over the trap door, the inner diameter of the annular rim is compressible against a body of the trap terminating the pipeline so as to seal an inner volume of the canister pressure-tight thereby containing the trap door within the pressure-tight volume.