RU2423640C2 - Device for pipeline shut down - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device consists of flange 1, of movable flange 2, gland seal 3 attached to external side of movable flange, of swinging bracket 4 equipped with insertion 5 for shut down and insertion 6 for passage of transported medium flow. Erection pins 7, 8 and 9 are installed in bosses of the flanges parallel to the pipeline. Erection pin 7 is secured in boss 10 on cylinder surface and rotates around its own axis. Erection pin 8 is secured in boss 11 and rotates in plane of radial section of the pipeline. Opposite sides of pins 7, 8 and erection pin 9 enter threaded connections with nuts 12. The latter are secured in bosses 13 with spherical bearings 14. Under operation mode flanges 1, 2 and one of insertions are tightened with pins 16 and nuts 17, while the seal gland is tightened with bolts 18. In a version of the invention swinging bracket 4 is installed on erection pin 7 with sleeve nut 15 with a pitch less, than pitch of threaded connections of erection pins with nuts 12. In the third version of the invention the device has a flange movable along axis of the pipeline; on external end of the flange there is arranged a gland seal.

EFFECT: elimination of warps of threaded connections, reduced labour input at shutting down and elimination of harmful deformations of pipeline.

3 cl, 2 dwg

Description

The invention relates to pipeline transport and can be used to shut off pipelines for technological purposes (installation, repair, testing, etc.).

A device is known for technological overlapping of pipelines, see patent RU 2321794. The device contains flanges with bosses that are rigidly connected by traverses fixed in bosses parallel to the pipeline. Flanges and traverses form a frame in which the gland packing and swivel bracket are located, equipped with inserts for blocking and passing the flow of the transported medium. A swivel bracket is installed between the flanges on one of the traverses. The device provides overlapping of the pipeline without changing the position of the connected pipes while maintaining the construction dimensions and centering indicators.

The device is inconvenient to maintain, since it does not have an axial shift mechanism for the liners and seal parts, and the crossheads make it difficult to access the stuffing box packing. The device is significant in size and weight.

Closest to the proposed invention is a device for technological shutoff of a pipeline through a flange connection, see patent RU 2349828. The device contains flanges with bosses, a swivel bracket equipped with inserts for blocking and passing the flow of the transported medium, mounting studs and tightening studs with nuts. Mounting pins are installed parallel to the pipeline in bosses on threaded connections in the opposite direction, and a swivel bracket is installed between the flanges and mounted on one of the mounting studs. In working condition, the flanges and liners are tightened with studs and nuts. Mounting pins provide dilution and flattening of flanges when changing liners due to deformations of adjacent sections of the pipeline and the flanges themselves. At the same time, distortions and significant loads occur in threaded joints, which impede the work of personnel and create the risk of damage to the pipeline. The device does not provide the removal of the liners from the sealing surfaces of the flanges and the free rotation of the liners in the gap between the flanges, which requires additional mounting effort.

The problem solved by the invention is to reduce operating costs and increase the safety of technological overlap of the pipeline.

The technical result from the use of the invention is to eliminate distortions of threaded joints, reducing the complexity of the overlap and eliminating dangerous deformation of the pipeline.

The proposed device for technological overlapping of pipelines contains flanges with bosses, a swivel bracket with inserts for shutting off and passing the flow of the transported medium, mounting studs and tightening studs with nuts fixed in parallel to the pipeline. A swivel bracket is installed between the flanges and fits on one of the mounting studs.

In order to exclude distortions of threaded joints and maintain the necessary centering of the connected sections of the pipeline, one mounting pin is fixed in the boss of the flange along a cylindrical surface with the possibility of rotation about its axis. The second mounting pin is fixed in the boss of the flange with the possibility of rotation in the plane of the radial section of the pipeline. The opposite sides of these studs and the third mounting stud are threaded to nuts, which are secured to the boss by spherical bearings.

The device provides dilution and flattening of the flanges with minimal effort without jamming the threaded joints of the mounting studs.

The second version of the device. The device for overlapping according to the first embodiment, characterized in that the swivel bracket is mounted on the mounting pin by means of a sleeve nut, and the threaded connection “sleeve nut - mounting pin” is made with a smaller pitch than in other threaded connections of mounting studs.

The device provides removal of the liners from the sealing surfaces of the flanges and the free rotation of the liners in the gap between the flanges.

The third version of the device. The device for overlapping according to the first embodiment, characterized in that it is made with a flange movable along the axis of the pipeline, on the outer end of which a gland seal is installed.

The device eliminates installation deformations of the pipeline and provides free access to the packing gland.

Figure 1 presents the kinematic diagram of the device, figure 2 is a General view of the preferred design of the device.

The device consists of a fixed flange 1, a movable flange 2, mounted on the outside of the movable flange of the stuffing box seal 3, a swivel bracket 4, equipped with a liner 5 for overlapping and a liner 6 for passing the flow of the transported medium.

Mounting studs 7, 8 and 9 are installed in the bosses of the flanges parallel to the pipeline. Mounting stud 7 is mounted in the boss 10 along a cylindrical surface with the possibility of rotation about its axis. The mounting pin 8 is fixed in the boss 11 with the possibility of rotation in the plane of the radial section of the pipeline. The opposite sides of the studs 7, 8 and the mounting stud 9 are threaded to the nuts 12, which are fixed in the bosses 13 by means of spherical bearings 14.

The swivel bracket 4 is mounted on the mounting pin 7 by means of the sleeve nut 15. The threaded connection “sleeve nut 15 - mounting pin 7” is made with a step smaller than the step of the threaded connections of the mounting studs with nuts 12. The mounting studs 7 and 9 are equipped with turnkey places.

In working condition, the flanges 1, 2 and one of the liners are tightened with pins 16 and nuts 17, and the stuffing box seal is tightened with bolts 18.

The device operates as follows.

If it is necessary to shut off the pipeline by rotating the bolts 18, remove the tightness in the packing 3, remove the nuts 17 and the studs 16. Rotate the flanges and the insert 5 by rotating one and fixing the other part of the “mounting stud-nut” connections. In this case, between the insert 5 and the adjacent surfaces of the flanges are formed Clearances due to the smaller thread pitch in the connection of the stud 7 and the sleeve nut 15 relative to the thread pitch in the connection of the mounting studs to the nuts 12.

By turning the bracket 4 from the flow part of the device, the insert 5 is inserted and the insert 6 is inserted. By rotating one and fixing the other part of the “mounting stud-nut” connections, the flanges and insert 6 are brought together. Then, the studs 16, nuts 17 are installed, the flanges and insert are tightened, and the bolts 18 tighten the stuffing box seal.

After completion of work on the pipeline in the same sequence, replace liner 6 with liner 5 to pass the flow of the transported medium.

The industrial applicability of the invention is confirmed by the operation of the installation series. The production of the proposed device is implemented in a metalworking plant.

The present invention allows to reduce operating costs for technological overlap of pipelines.

Claims (3)

1. A device for technological overlapping of pipelines, containing flanges with bosses, a swivel bracket with inserts for blocking and passing the flow of the transported medium, mounting studs fixed in the bosses parallel to the pipeline, mounting studs, tightening studs with nuts, a rotary bracket mounted between the flanges and mounted on one of the mounting studs characterized in that one mounting pin is fixed in the boss of one of the flanges on a cylindrical surface with the possibility of rotation about its axis, sec i stud assembly is secured to the boss of one of the flanges to rotate in a radial sectional plane of a pipeline, the opposite sides of these pins and the third assembly includes a stud threaded connections with bolts which are secured in the lugs by means of spherical bearings. 2. The device for technological overlapping of pipelines according to claim 1, characterized in that the swivel bracket is mounted on the mounting pin by means of a sleeve nut, and the threaded connection “sleeve nut - mounting pin” is made with a step smaller than the step of the other threaded connections of the mounting studs. 3. The device for technological overlapping of pipelines according to claim 1, characterized in that it is made with a flange movable along the axis of the pipeline, at the outer end of which a gland seal is installed.

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