RU2269642C2 - Flanged coupling for equipment - Google Patents

Abstract

FIELD: mechanical engineering, particularly for oil and gas production, oil refinery and other industries to design flanged and quick-disconnecting joints for well control head, main pipelines and to connect pumping units with pipelines.

SUBSTANCE: flanged connection comprises sealing metal pad inserted in end grooves between end surfaces of equipment to be connected and resilient guard collar. The guard collar is installed in inner annular groove formed in metal pad. The second guard collar is arranged in annular groove created in the metal pad. The guard collars have trapezoid cross-sections and arranged so that major trapeze base are located in corrosive medium action direction and a gap is created between side surfaces thereof and side surfaces of the annular grooves.

EFFECT: increased air-tightness and extended service life.

2 dwg

Description

The invention relates to the field of engineering, in particular to the oil and gas extraction, oil and gas processing industry, and can be used in the new design of flange and quick disconnect connections of wellhead equipment, main pipelines, connections of pumping units with pipelines operated, for example, in sea water, in the development of oil and gas fields sea shelves.

Known flange connections of equipment [1] - [4].

The disadvantages of the known flange connections of the equipment are the lack of reliability during operation, the large tensile forces of the flange connections to ensure tightness, regular monitoring during their operation.

Known flange connection of equipment [5], containing a sealing metal gasket with a safety elastic ring mounted in its internal groove with the possibility of interaction with the sealing surfaces of the connection equipment.

The disadvantages of the known flange connection of the equipment are unreliability during operation, as a result of the lack of protection of the connection from the effects of pumped and external aggressive media at the same time, the need for regular monitoring during their operation, which is technically complicated when developing oil fields on offshore shelves.

The technical task of the invention is to increase the reliability of sealing flange joints of equipment, to protect joints at the same time both from pumped aggressive media, and from the effects of, for example, sea water in the development of oil fields on offshore shelves, in ensuring fire and environmental safety, in their repeated use without repair and restoration operations, in reducing overhead costs to ensure the tightness of flange joints of equipment.

The solution to the technical problem is achieved by the fact that the flange connection of the equipment containing a sealing metal gasket installed in the end grooves between the end sealing surfaces of the equipment, a safety elastic ring installed in the inner ring groove made in the sealing metal gasket with the possibility of interaction with the sealing surfaces of the equipment, characterized in that it is equipped with a second safety ring mounted in the annular groove made in a sealing metal gasket, while the safety rings are made in the form of a trapezoid in cross section and are installed in the annular grooves of the sealing metal gasket with the greater side of the trapezoid in the direction of influence of the pumped and external aggressive media and with gaps between their side surfaces and the side surfaces of the ring grooves of the sealing metal gaskets for their axial displacements and with the possibility of elastic deformation of the large sides of the trapezoid when interacting with densified surfaces of equipment for protection against the effects of pumped and external aggressive media.

Figure 1 shows the flange connection of the equipment to tighten the flanges with threaded connecting elements.

Figure 2 shows the flange connection of the equipment during operation, for example, in sea water.

The flange connection of the equipment contains:

flange connection of equipment, e.g. piping, 1,

sealing metal gasket 2,

annular grooves 3 made in a sealing metal gasket (figure 1, figure 2),

safety elastic rings made in the form of trapezoid in section 4 (figure 1, figure 2),

end sealing surfaces of the flange connection of equipment 5,

connecting threaded elements 6,

large sides of the trapezoid 7 (figure 1, figure 2),

the side surfaces 8 of the annular grooves (figure 1, figure 2),

the gaps 9 (Δ1) between the side surfaces of the safety elastic rings and the side surfaces of the annular grooves (figure 1) during installation,

the side surfaces 10 of the safety elastic rings (figure 1, figure 2), the axis of the flange connection of the equipment 11,

the gaps 12 (Δ2) between the side surfaces of the safety elastic rings and the side surfaces of the annular grooves during operation,

pumped aggressive environment 13 (figure 2),

external aggressive environment 14 (figure 2), for example, sea water.

In the static position, the elements of the flange connection of the equipment interact as follows.

In the annular grooves 3 made in the sealing metal gasket 2, safety elastic rings are installed, made in the form of a trapezoid in section 4.

The sealing metal gasket 2 with the safety elastic rings 4 is installed in the end grooves of the flange connection of the equipment 1 between the end sealing surfaces 5 (Fig. 1).

In this case, the gaps 9 (Δ1) between the lateral surfaces 8 of the annular grooves and the lateral surfaces of the safety elastic rings 10 (Fig. 1) during installation vary within the difference between the dimensions of the width of the annular grooves and the corresponding thickness of the safety elastic rings, as well as tolerances for their manufacture.

Connecting threaded elements 6, the flange connection of the equipment 1 is pulled together (figure 2).

Moreover, the large sides of the trapezoid 7 (Fig. 1) of the safety elastic rings 4 are elastically deformed (Fig. 2) and simultaneously move relative to the axis of the flange connection of the equipment 11, depending on the tolerances for the manufacture of safety elastic rings 4, the metal sealing ring 2, as well as tolerances for the manufacture of grooves for the flange connection of the equipment [5] with the formation of gaps 12 (Δ2) between the side surfaces of the safety elastic rings 10 and the side surfaces 8 of the annular grooves 3.

In a dynamic position, during operation, for example, in sea water 14 during the development of oil and gas fields on offshore shelves, the elements of the flange connection of the equipment interact as follows.

Safety elastic rings made in the form of a trapezoid in section 4, through the interaction of the connecting threaded elements 6 interact with the end sealing surfaces 5 of the flange connection of the equipment 1 (Fig. 1), elastically deform and acquire a convex shape (Fig. 2) in the direction of exposure to the pumped aggressive environment 13 and external aggressive environment 14, such as sea water.

At the same time, additional joint seals and simultaneous protection of the joint against pumped and external aggressive media are provided.

At the same time, under the influence of the connecting threaded elements 6, a sealing of the sealing metal strip 2 is provided along the end grooves of the flange connection of the equipment 1 (Fig. 2, metal-metal seal).

Therefore, the proposed invention, the flange connection of the equipment provides a rigid connection that meets the requirements of fire and environmental safety, especially for equipment operating on offshore shelves.

The proposed flange connection of equipment in terms of technical solutions has no analogues both in the Russian Federation and abroad, it is simple to manufacture, reliable in operation, competitive and will be widely used in the oil and gas industry of the Russian Federation and abroad, especially in the development of oil and gas fields in offshore Shelves with a positive technical and economic effect.

Information sources

1. RF № 2170807, 1996.

2. RF No. 2167265, 1996.

3. RF No. 2123631, 1997.

4. GOST 28919-91.

5. RF No. 2178510, 1998.

Claims (1)

A flange connection of equipment containing a sealing metal gasket installed in the end grooves between the end sealing surfaces of the equipment, a safety elastic ring installed in the inner ring groove made in the sealing metal gasket with the ability to interact with the sealing surfaces of the equipment, characterized in that it is provided with a second safety ring installed in an annular groove made in a sealing metal laying, while the safety rings are made in the form of a trapezoid in cross section and are installed in the annular grooves of the sealing metal gasket with the greater side of the trapezoid in the direction of influence of the pumped and external aggressive media and with gaps between their side surfaces and the side surfaces of the ring grooves of the sealing metal gasket for their axial movements when interacting with sealed surfaces of equipment to protect against the effects of pumped and external aggressive media.

Images