PL181068B1 - Insulated pipeline joint - Google Patents

Abstract

1. Insulating pipeline joint having the form of a cylindrical body inside which insulating spacers are mounted, characterized in that flanges (2) and (3) are inseparably attached to the end faces of pipes (1), wherein the flange (2) in the peripheral zone has a groove (4) for a permanently shaped lock (5) connected thereto, and the flange (3) on the end face (10) has an annular projection (11) with a cross-sectional outline close to a triangle, and its outer surface (12) is deflected from the plane perpendicular to the axis of the pipes (1) by an angle of several degrees, furthermore the flanges (2) and (3) are arranged in such a way relative to each other that there is an air gap of size (a) between the inner surface (13) of the flange (2) and the edge of the annular projection (11), furthermore the lock (5) has an inner surface (14) inclined at an angle approximately equal to the angle of inclination of the outer surface (12) of the flange (3).

Description

The subject of the invention is an insulating pipe joint for use in gas pipelines, in pipelines for transporting fluids.

Pipeline joints are known in which the flanges with insulating elements are screwed together with locks screwed onto the flanges or clamping rings.

The disadvantage of these solutions is the possibility of unsealing of the joint in the event of pipeline misalignment resulting from lack of precision during assembly or displacement in the ground, the possibility of unsealing caused by the burning of seals by the flowing electric charge from possible atmospheric discharges.

The object of the invention is to remedy the above drawbacks and inconveniences.

The essence of the invention, which is an insulating joint of pipelines, in the form of a cylindrical body, inside which insulating spacers are embedded, consists in the fact that flanges are permanently attached to the end faces of the pipes, while one of the flanges in the peripheral zone has a groove permanently connected to it shaped lock. The second flange has an annular projection with a cross-sectional outline close to a triangle, and its outer surface is deviated from the plane perpendicular to the pipe axis by a dozen or so degrees. In addition, the flanges are arranged relative to each other that an air gap exists between the inner surface of one flange and the edge of the annular projection. The lock, on the other hand, has an inside inclined at an angle approximately equal to that of the outer surface of the collar.

It is advantageous if insulating spacers are embedded in the spaces between the surfaces of the flanges and the lock.

Thanks to the solution according to the invention, the following technical and operational effects were obtained:

- high joint tightness coefficient,

- the possibility of obtaining a high coefficient of tightness with pipeline misalignment, _

- the possibility of transferring high-voltage electric charges between individual sections of the pipeline,

- pipeline lightning protection,

- securing the spacers against burning due to atmospheric discharges,

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- increasing the mechanical strength of the pipeline,

- elimination of interference in the connector of unauthorized persons,

- facilitating the quality control of welds,

- simplicity of construction and assembly,

- lower requirements for assembly alignment,

- insensitivity to pipeline displacement in the ground.

The subject of the invention, in an exemplary embodiment, is shown in the drawing which shows a diagram of the joint in a cross-section in the plane passing through the pipeline axis.

Flanges 2 and 3 are welded to the end faces of the pipes 1. The flange 2 has a groove 4 in its peripheral zone, in which a lock 5 is mounted, connected to the flange 2 by welding. In the central zone, the flange 2 has a recess 6 for an insulating spacer 7 and a sealant 8. In a central area, the flange 3 has a recess 9 for an insulating spacer 7 and a sealant 8. Above the recess 9 in the end face 10, it has an annular projection 11 with a cross-section similar to a triangle. . The outer surface 12 of the flange 3 is deviated from the plane perpendicular to the axis of the pipes 1 by an angle of several degrees. The flanges 2 and 3 are positioned with respect to each other such that between the inner surface 13 of the collar 2 and the edge of the annular tongue 11 of the collar 3 there is an air gap of the size a. The lock 5 has an inner surface 14 inclined at an angle corresponding to the inclination angle of the surface 12 of the collar 3. The spaces between the surfaces 13, 10 of the flanges 2 and 3 above the tongue 11 are filled with an insulating spacer 15; between the peripheral surfaces of the collar 3 and the lock 5 are filled with an insulating spacer 16; between the outer surface 12 of the collar 3 and the surface 14 of the lock 5 with a spacer 17, and the lock 5 is additionally sealed with a dielectric spacer. 18.

The joint, in the case of the coaxiality of the pipes 1 through the initial clamp of the insulating spacers 6, 7, 15, 16, 17 and 18, maintains a high degree of boundary tightness.

In the case of buckling of pipes 1 of adjacent sections, the tightness value is set at a predetermined level due to the inclination of the surface 12 of the flange 3 and the surface 14 of the lock 5.

In the event of a lightning strike in the relay station and high voltage flow to pipes 1, by using the blade effect on the annular lug 11, a high voltage spark will jump between the flanges 2 and 3, protecting the insulating spacers 7, 15, 16, 17 and 18 from carbonization, and thus against unsealing the pipeline.

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Publishing Department of the UP RP. Mintage 60 copies. Price PLN 2.00.

Claims (2)

Patent claims 1. Insulating connection of pipelines in the form of a cylindrical body, inside which insulating spacers are embedded, characterized in that flanges (2) and (3) are permanently attached to the end faces of the pipes (1), the flange (2) in the peripheral zone has a groove (4) for a shaped lock (5) permanently connected to it, and the flange (3) on the face (10) has an annular tongue (11) with a cross-sectional outline close to a triangle, and the outer surface (12) has a deviation from a plane perpendicular to the pipe axis (1) by an angle of several degrees, in addition, the flanges (2) and (3) are positioned in such a way that there is an air gap between the inner surface (13) of the flange (2) and the edge of the annular tongue (11) size (a), in addition, the lock (5) has an inside face. (14) inclined at an angle approximately equal to that of the outer surface (12) of the collar (3). 2. The connector according to claim 3. Insulating spacers (15), (16), (9) are embedded in the spaces between the surfaces (13), (12) and (10) of the collars (2) and (3) and the lock (5), (7).