RU2116553C1 - Device for removal of defects from operating pipe line and connection of branches to it - Google Patents

Abstract

FIELD: devices for removal of defects and connection of branches to pipe line. SUBSTANCE: device includes adapter branch pipe secured on pipe line, damper and unit consisting of chuck with drive, centering drill and cutter; it is provided with C-shaped circular magnet fitted in cavity of cutter for limited axial displacement; magnet has axial hole for centering drill; lower end surface of circular magnet engageable with pipe line has identical form. In preferable version, cutter has inner holding pins located in C-shaped circular cavity of magnet. EFFECT: enhanced efficiency. 2 cl, 1 dwg

Description

 The invention relates to pipeline transport technology and can be used primarily in the operation of gas pipelines, oil and product pipelines for cutting defects from the pipeline.

 A device is known for attaching branches to an existing pipeline, comprising a pipe and a threaded boss welded to the pipeline, a valve and a housing mounted on the pipe, a cover with an axial hole tightly fixed to the housing, a hollow shaft with a handle and a feed mechanism mounted in the opening of the cover with the possibility of axial and rotational movement, a cutting element mounted on a rod, made in the form of an electric cutter, a copier placed on the cover, a threaded sleeve mounted in the lower part with a rod with the possibility of impact with the boss, and the power cable passed through the hollow rod [1].

 Such devices make it possible to attach an outlet to an existing pipeline (water supply system) and to cut out defects from it, for example, traffic jams, which impede the passage of in-pipe shells through the pipeline. The use of such a device on an existing pipeline, through which natural gas, oil or oil product is transported under high pressure, is fire and explosion hazard due to window cutting by molten steel or an electric arc.

 The closest known device is for connecting bends to an existing pipeline, consisting of an adapter pipe, a valve and a device for cutting a window using mechanical cutters [2].

 However, when using this device, a cut piece of the pipe wall and metal chips are in the internal cavity of the pipeline and may subsequently cause malfunctions in the pipeline, in particular, they can damage the pump and / or in-line diagnostic projectile.

 The objective of the invention is to develop a device designed to remove defects from an existing pipeline and attach bends to it, preventing the cut piece of the pipe wall and metal chips from falling into the pipeline during the removal of defects.

 The problem is solved by the proposed device for removing defects from the existing pipeline and connecting the bends, containing a transition pipe fixed to the pipeline, a valve and a window cutting device, including a clamp pipe with a drive, a centering drill and a mill, which is equipped with a limited axial fit in the mill cavity displacements of a C-shaped annular magnet in longitudinal section with an axial hole for a centering drill, the lower end face over The ring magnet in contact with the pipeline has an identical shape to it.

 In a preferred embodiment, the milling cutter has internal holding fingers located in the C-shaped annular cavity of the magnet.

 The drawing shows a cross section of the device.

 A pipe 2 is provided to the pipeline 1. A valve 4 and a housing 5 are installed on the flange 3 of the pipe 2, in the cover 6 of which there is an axial hole with a stuffing box 7. The shaft 8 installed in the hole of the cover 6 with the possibility of axial and rotational movement has a handle for rotation 9 or driven gear of the drive (not shown in the drawing). A clamping device 10 is installed at the lower end of the shaft 8, and a cutter 12 is mounted in the outer chuck 11 of the cutter 12. Inside the cutter 12, a C-shaped annular magnet 13 is mounted with a limited axial displacement in longitudinal section with a cavity 14 and a hole 15 for a centering drill 16, moreover, the end surface of the annular magnet 13 is made curved with the possibility of a snug fit to the surface of the pipe 1. The cavity 14 of the magnet includes the internal holding fingers 17 of the cutter, and through the axial hole bypasses the centering drill 16 mounted in the inner chuck 18.

 Attachment of the tap and cutting out a defect, for example, a conical plug-chop 19, welded to eliminate damage and preventing the passage of in-tube shells, is as follows. A pipe 2 is welded to the pipeline 1. A valve 4 and a housing 5 are mounted on the pipe flange 3. The shaft 8 is lowered by the handle 9 at the upper end until the drill 16 and the curved surface of the magnet 13 adjoin the pipe surface 1. After drilling holes in the pipe with a drill 16, the cutter 12 cuts the pipe section with the defect 19. After cutting the circular element from the pipe, the shaft 8 rises, while the circular pipe wall element and metal chips are held by magnet 13. Giving the end surface to sheeting of a curved surface with the possibility of a snug fit to the pipe allows you to hold and remove the circular element of the pipe of large weight. The valve 4 closes, and the housing 5 is dismantled. After that, a pipe-branch is connected to the valve 4, through which pumping can be carried out.

 The use of the device allows for the cutting of defects and the connection of outlets with the removal of cut sections of the pipe from the pipeline and preventing metal chips from entering the pipeline.

Claims (2)

 1. A device for removing defects from an existing pipeline and attaching bends to it, comprising a transition pipe welded to the pipeline with a valve, on which a window cutting device is installed, including a housing, a centering drill and a milling cutter fixed in a chuck associated with the actuator, characterized the fact that the device for cutting the window is equipped with a ring magnet with a C-shaped in longitudinal section with an axial hole for a centering drill, and the ring magnet is installed in the cavity the axes with the possibility of limited axial movement and its lower end surface in contact with the pipeline has an identical shape with it.  2. The device according to p. 1, characterized in that the cutter has internal holding fingers located in the C-shaped annular cavity of the magnet.