A submarine pipeline end plugging device

Abstract

The utility model discloses a submarine pipeline end plugging device, wherein a front end sealing ring is installed on the outside of the end seat, an inner expansion clamp is inserted into the rear end and a fastening assembly is installed, an outer pressure sleeve is inserted into the rear end of the inner expansion clamp, and a pressure relief valve is installed in the middle of the end of the outer pressure sleeve. This patent drives the inner expansion clamp to clamp the inside of the pipeline by tightening the fastening device distributed circumferentially on the outer end, and at the same time, the sealing rings distributed front and back are deformed and squeezed to form a seal with the inner wall of the pipeline, thereby achieving the fixation and sealing of the pipeline end. By evenly sticking to the inner wall of the pipeline, there will be no local discontinuous jamming, ensuring uniform and continuous tightening of the pipeline in the circumferential direction, good sealing, no movement when subjected to a certain pressure, and stable and reliable during pipeline recovery construction.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering construction, in particular to a submarine pipeline end plugging device. Background Art

[0002] After years of development and use, some offshore facilities have lost their value for further development, or the facilities themselves can no longer meet the requirements of further development. Therefore, the offshore facilities that have lost their development value can only be recycled and abandoned. The abandonment of submarine pipelines is an important part of the recycling and abandonment construction. Before the submarine pipeline is abandoned, in order to avoid the residual oil or chemical agents inside it from polluting the environment, the entire submarine pipeline system is usually discharged, cleaned and collected to completely remove the pollutants in the submarine pipeline system. After cleaning, the submarine pipeline is cut by divers using an underwater cutting machine, and then the riser at the platform end is lifted with the conductor rack, and the horizontal pipeline is collected by the reverse method of laying pipes. However, some submarine pipelines and risers after cutting still have pollution risks, and temporary plugging is required during the recycling construction. Since there will be a certain internal and external pressure difference due to the influence of water pressure during the recycling operation, the plugging device needs to be able to be installed quickly and withstand a certain pressure.

[0003] In order to solve the above problems, we proposed a submarine pipeline end plugging device. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a submarine pipeline end plugging device, and the utility model provides the following technical solutions:

[0005] A submarine pipeline end plugging device comprises an end seat and an external pressure sleeve, wherein a front end sealing ring is installed on the outside of the end seat through a provided step, a fastening assembly is installed on the rear end of the end seat through threaded blind holes evenly distributed around the circumference, the rear end of the end seat is inserted into the front end of an internal expansion clamp, the front end of the external pressure sleeve is inserted into the rear end of the internal expansion clamp, the external pressure sleeve is installed through circumferentially evenly distributed light holes to allow the fastening assembly to pass through, a rear end sealing ring is installed on the outside of the external pressure sleeve through a provided step, and a pressure relief valve is installed in the middle of the end of the external pressure sleeve through a sealing thread.

[0006] Preferably, the end seat is a disc with a taper at the front end which is formed by processing a stainless steel plate.

[0007] Preferably, the inner expansion clamp is a component made of stainless steel with an annular groove on the outside and a wedge-shaped step nested inside, and a process retaining ring is provided at the rear end of the inner expansion clamp.

[0008] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0009] 1. By tightening the fastening device distributed circumferentially on the outer end, the inner expansion clamp is driven to clamp the inside of the pipe. At the same time, the sealing rings distributed in the front and back are deformed and squeezed to form a seal with the inner wall of the pipe, thereby fixing and sealing the end of the pipe;

[0010] 2. By evenly sticking to the inner wall of the pipe, there will be no local discontinuous sticking, ensuring uniform and continuous tightening of the pipe in the circumferential direction, good sealing, and no movement when subjected to a certain pressure, ensuring stability and reliability during pipe recovery construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used to illustrate the purpose of the preferred embodiment and are not considered to be limitations of the present invention. In the entire drawings, the same reference numerals are used to represent the same parts.

[0012] In the attached picture:

[0013] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the utility model;

[0014] Figure 2 It is a schematic diagram of the composition of the blocking device of the preferred embodiment of the utility model.

[0015] in, Figure 1~2 The corresponding relationship between the reference numerals and the components is as follows:

[0016] 1. End seat; 2. Front sealing ring; 3. Internal expansion clamp; 4. Rear sealing ring; 5. External pressure sleeve; 6. Fastening assembly; 7. Pressure relief valve. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0019] Combine the following Figure 1~2 A submarine pipeline end plugging device according to an embodiment of the utility model is specifically described.

[0020] like Figure 1~2 As shown, the submarine pipeline end plugging device is installed in the hole of the cut pipeline end. By tightening the fastening devices distributed circumferentially on it, the device clamps the inside of the pipeline. At the same time, the sealing ring of the outer ring sleeve is deformed and squeezed to form a seal, thereby fixing and sealing the pipeline end.

[0021] The end seat 1 is a stainless steel plate with a tapered disc at the front end, which is convenient for insertion into the pipe during installation. There is a step on the outside for installing the front end sealing ring 2. The overall outer diameter is smaller than the inner diameter of the pipe to be blocked, forming a single-sided gap to facilitate installation. The threaded blind holes evenly distributed around the rear end of the end seat 1 meet the requirements of the stud installation of the fastening component 6. The rear end of the end seat 1 is inserted into the hole of the inner expansion clamp 3 to achieve axial extrusion of the inner expansion clamp 3 when the fastening component 6 is pre-tightened, and the front end sealing ring 2 is extruded simultaneously. Due to the setting of the step, the front end sealing ring 2 will not be over-pressurized. In accordance with the need for lightweight structure and to improve the convenience of underwater operation, some grooves are processed inside the structure to moderately reduce the weight while meeting functional requirements.

[0022] The front end sealing ring 2 is a sealing ring with a square cross-section made of rubber. The ring sleeve is installed on the outside of the step of the end seat 1, and the other end is close to the end face of the inner expansion clamp 3. When the fastening component 6 is pre-tightened, the end face of the inner expansion clamp 3 and the end seat 1 are squeezed and deformed to fill the gap between the sealing device and the inner wall of the pipeline, thereby playing a sealing role.

[0023] The internal expansion clamp 3 is a component made of stainless steel with an annular groove on the outside and a wedge-shaped step nested inside. It is installed on the outer steps of the end seat 1 and the outer pressure sleeve 5 through a ring sleeve. A process retaining ring is also provided at the rear end to achieve uniform extrusion of the rear end sealing ring 4. According to the changes in the external expansion, the angle of the wedge-shaped step is different. The more the diameter is expanded, the larger the wedge angle is.

[0024] The rear end sealing ring 4 is a sealing ring with a square cross-section made of rubber. The ring sleeve is installed on the outside of the step of the outer pressure sleeve 5, and the other end is close to the end face of the inner expansion clamp 3. When the fastening component 6 is pre-tightened, the end face of the inner expansion clamp 3 and the outer pressure sleeve 5 are squeezed and deformed to fill the gap between the sealing device and the inner wall of the pipeline, thereby playing a sealing role.

[0025] The outer pressure sleeve 5 is a disc processed from a stainless steel plate. The middle through hole is threaded to meet the connection and installation of the pressure relief valve 7. The light holes evenly distributed around the circumference meet the installation of the studs of the fastening assembly 6. There is a step on the outside for the installation of the rear end sealing ring 4. The overall outer diameter is smaller than the inner diameter of the pipe to be blocked, forming a single-sided gap to facilitate installation. The front end is inserted into the hole of the inner expansion clamp 3 to achieve axial extrusion of the inner expansion clamp 3 when the fastening assembly 6 is pre-tightened. Due to the setting of the step, the rear end sealing ring 4 will not be over-pressurized. According to the needs of lightweight structure, the convenience of underwater operation is improved. Some grooves are processed inside the structure to moderately reduce the weight while meeting the functional needs.

[0026] The fastening assembly 6 is a sleeve with full threaded studs, thickened washers, and double nuts for locking. The studs are screwed into the threaded holes at the rear end of the end seat 1, passed through the flange holes of the outer pressure sleeve 5, and then the sleeve with thickened washers is put on. The end of the sleeve is installed with locking nuts and locking nuts, so that there is enough operating space during the fastening operation, which is convenient for the plugging device to be installed inside the pipe port. Different specifications of bolts are selected according to different fastening force requirements. At the same time, the exterior of the fasteners is galvanized or Teflon coated to meet the requirements of seawater corrosion resistance.

[0027] The pressure relief valve 7 is a standard valve with an external thread connection. It is installed in the middle of the end of the external pressure sleeve 5 and is installed through a sealing thread connection. When the sealing device is installed, the seawater caused by the volume change between the end seat 1 and the external pressure sleeve 5 is discharged to avoid difficulties in tightening and installation. The pressure relief valve 7 adopts a stainless steel ball valve to meet the maximum pressure tolerance during use.

[0028] The specific installation steps are:

[0029] Step 1: Design the pipeline end plugging device according to the parameters such as the inner diameter, water depth and material of the pipeline, complete the design and manufacture of the end seat 1, front end sealing ring 2, inner expansion clamp 3, rear end sealing ring 4 and outer pressure sleeve 5, purchase the fastening assembly 6 and the pressure relief valve 7, screw the stud of the fastening assembly 6 into the threaded hole of the end seat 1, insert the front end sealing ring 2, then install the inner expansion clamp 3, put the rear end sealing ring 4 on the outer pressure sleeve 5, and then align the stud of the fastening assembly 6 as a whole and insert it into the end face of the inner expansion clamp 3, then install the sleeve, locking nut and anti-loosening nut at the rear end of the fastening assembly 6, screw the pressure relief valve 7 into the center of the outer end face of the outer pressure sleeve 5, and the plugging device is assembled.

[0030] Step 2: After the cleaning of the submarine pipeline is completed, the diver goes into the water to install the cutting equipment to cut the pipeline, and moves the broken pipeline by crane to stagger the incisions, grinds the burrs on the cut ends, and hoists the end plugging device into the water. The diver operates to align the end seat 1 with the cut port of the pipeline, and slowly inserts the end plugging device into the pipeline. The insertion stops when the end face of the outer pressure sleeve 5 enters the pipeline port.

[0031] Step 3: Use a tool to temporarily clamp the sleeve at the rear end of the fastening assembly 6 to prevent the overall end plugging device from rotating when tightening the nut. Pre-tighten the locking nuts in the order of tightening the bolts to finally meet the moment / torque requirements. At this time, the internal expansion clamp 3 is opened and tightened inside the pipeline to provide axial fixing force to prevent it from coming out due to internal pressure. The front sealing ring 2 and the rear sealing ring 4 are squeezed and sealed to form a seal between the device and the pipeline to complete the installation. During the process, the internal seawater will overflow from the pressure relief valve 7 to avoid excessive tightening torque.

[0032] Step 4: After the pipeline is recovered, the pressure relief valve 7 is removed and the fastening assembly 6 is loosened. At this time, the inner expansion clamp 3 is retracted, and the front sealing ring 2 and the rear sealing ring 4 are deformed and restored. The plugging device is pulled out, the construction is completed, and the end plugging device is checked for damage. If there is damage, the components are replaced and then used for the plugging operation of the recovery construction.

Claims

1. A submarine pipeline end plugging device, comprising an end seat (1) and an outer pressure sleeve (5), characterized in that: The end seat (1) is externally provided with a front end sealing ring (2) through a provided step, the rear end of the end seat (1) is provided with a fastening assembly (6) through a threaded blind hole evenly distributed around the circumference, the rear end of the end seat (1) is inserted into the front end of the inner expansion clamp (3), the front end of the outer pressure sleeve (5) is inserted into the rear end of the inner expansion clamp (3), the outer pressure sleeve (5) is provided with a light hole evenly distributed around the circumference to allow the fastening assembly (6) to pass through and be installed, the outer pressure sleeve (5) is externally provided with a rear end sealing ring (4) through a provided step, and a pressure relief valve (7) is installed in the middle of the end of the outer pressure sleeve (5) through a sealing thread.

2. A submarine pipeline end plugging device according to claim 1, characterized in that: The end seat (1) is a circular disc with a taper at the front end, which is formed by processing a stainless steel plate.

3. The submarine pipeline end plugging device according to claim 1, characterized in that: The inner expansion clamp (3) is a component made of stainless steel, with an annular tooth groove on the outside and a wedge-shaped step nested inside. A process retaining ring is provided at the rear end of the inner expansion clamp (3).

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