Emptying vertical pipe based on stress release and used for natural gas long-distance pipeline

Abstract

The utility model discloses an emptying vertical pipe for a natural gas long-distance pipeline based on stress release. The emptying vertical pipe comprises a vertical pipe main body, the vertical pipe body is of a reducing structure and comprises a large barrel, a small barrel and a reducing section arranged between the large barrel and the small barrel. The diameter of the large barrel is larger than that of the small barrel; the variable-diameter section is a conical pipe body without a head, one end with a smaller diameter is connected with the small cylinder body, and one end with a larger diameter is connected with the large cylinder body; a first high-pressure vent nozzle, a medium-pressure vent nozzle, a second high-pressure vent nozzle and a drain outlet are sequentially formed in the pipe wall of the large barrel from one end connected with the reducing section to the other end; an included angle of 45 + / -2 degrees is formed between the first high-pressure vent nozzle, the medium-pressure vent nozzle and the second high-pressure vent nozzle and one end, far away from the variable-diameter section, of the large barrel; a partition plate which is inclined relative to the axis is arranged in the large barrel and at the position of the drain outlet; and a spiral spoiler taking the axial direction of the small cylinder body as an axis is arranged on the outer wall of the small cylinder body. According to the utility model, stress release of natural gas diffusion is realized.

Description

Technical Field

[0001] This utility model relates to the field of natural gas venting technology, and in particular to a venting riser for long-distance natural gas pipelines based on stress relief. Background Technology

[0002] In long-distance natural gas pipeline systems, vent risers are indispensable safety devices. When pipelines require maintenance, replacement, or emergency venting, the vent riser is used to safely release the natural gas inside the pipeline into the atmosphere.

[0003] In existing technologies, the opening of the vent riser is mostly horizontal. Therefore, during the natural gas venting process, the high-speed flowing natural gas will generate a large impact force at the opening, resulting in high stress at the pipe opening.

[0004] Under such high stress conditions for a long period of time, the equipment is prone to fatigue cracks or even fractures, which seriously affects the safety and service life of the venting riser and thus poses a threat to the safe operation of long-distance natural gas pipelines.

[0005] Furthermore, high stress may cause the seal at the connection between the vent riser and the pipeline to fail, leading to safety accidents such as natural gas leaks.

[0006] Furthermore, when dealing with complex environmental loads such as wind pressure and earthquakes, the stability of the existing vent riser structure is difficult to guarantee due to stress concentration at the pipe opening.

[0007] Therefore, how to effectively reduce pipe stress, improve the safety and service life of venting risers, and ensure the safe and stable operation of long-distance natural gas pipelines has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] In view of the above-mentioned deficiencies of the prior art, this utility model provides a stress-relieving venting riser for long-distance natural gas pipelines. The purpose is to effectively reduce the stress at the pipe inlet, improve the safety and service life of the venting riser, and ensure the safe and stable operation of long-distance natural gas pipelines.

[0009] To achieve the above objectives, this utility model discloses a stress-relieving venting riser for long-distance natural gas pipelines, including a riser body;

[0010] The main body of the riser is a variable diameter structure, including a large cylinder, a small cylinder, and a variable diameter section disposed between the large cylinder and the small cylinder;

[0011] The diameter of the large cylinder is larger than the diameter of the small cylinder;

[0012] The variable diameter section is a tapered tube with the end removed, with the smaller diameter end connected to the small cylinder and the larger diameter end connected to the large cylinder.

[0013] The pipe wall of the large cylinder is provided with a first high-pressure vent, a medium-pressure vent, a second high-pressure vent, and a drain outlet in sequence from one end connected to the variable diameter section to the other end. It is connected to the long-distance natural gas pipeline through the first high-pressure vent, the medium-pressure vent, and / or the second high-pressure vent, and natural gas is released through the end of the small cylinder away from the variable diameter section.

[0014] The first high-pressure vent, the medium-pressure vent, and the second high-pressure vent form an angle of 45 degrees ± 2 degrees with the end of the large cylinder that is away from the variable diameter section;

[0015] The sewage outlet is arranged perpendicularly to the large cylindrical body;

[0016] Inside the large cylindrical body, a partition is provided at the location of the sewage outlet, which is inclined to the axis.

[0017] The outer wall of the small cylinder is provided with a spiral baffle plate with the axis of the small cylinder as the axis;

[0018] The outer surface of the riser body, the spiral baffle, the portion of the riser body near the baffle, and the side of the baffle facing the water accumulation portion inside the riser body are all coated with an anti-corrosion coating.

[0019] Preferably, a bolt seat is provided at the end of the large cylinder away from the diameter-changing section, and the cylinder is fixed to the civil foundation through the bolt seat.

[0020] More preferably, the bolt seat includes a bolt seat base plate disposed at one end of the large cylinder away from the variable diameter section, a bolt seat ring plate disposed between the bolt seat base plate and the drain outlet and disposed parallel to the bolt seat base plate, and a plurality of bolt seat ribs disposed between the bolt seat base plate and the bolt seat ring plate.

[0021] The bolt seat base plate is annular or circular in shape and is welded and fixed to the end of the large cylinder away from the variable diameter section;

[0022] The bolt seat ring plate is annular in shape, and its inner hole is welded and fixed to the outer wall of the large cylinder located between the bolt seat bottom plate and the drain outlet.

[0023] All the bolt seat stiffeners are rectangular, evenly distributed around the axial direction of the large cylinder, and are welded and fixed to the bolt seat base plate, the bolt seat ring plate, and the outer wall of the large cylinder.

[0024] Preferably, the first high-pressure vent includes a first high-pressure vent pipe connected at one end to the large cylinder, and a first high-pressure vent flange disposed at the other end of the first high-pressure vent pipe.

[0025] The medium-pressure vent includes a medium-pressure vent pipe connected at one end to the large cylinder, and a medium-pressure vent flange disposed at the other end of the medium-pressure vent pipe.

[0026] The second high-pressure vent includes a second high-pressure vent pipe connected at one end to the large cylinder, and a second high-pressure vent flange disposed at the other end of the second high-pressure vent pipe.

[0027] The drain outlet includes a drain outlet pipe connected to the large cylinder at one end, a drain valve installed on the drain outlet pipe, and a drain elbow installed at the other end of the drain outlet pipe.

[0028] Preferably, the natural gas long-distance pipeline is fastened to the first high-pressure vent, the medium-pressure vent, and / or the second high-pressure vent by means of flanges and bolts, and sealed by means of gaskets.

[0029] Preferably, the spiral baffle is made of Q235B flat steel and is fixed to the small cylinder by welding.

[0030] Preferably, the pipe wall of the large cylinder is provided with a hand hole located between the second high-pressure vent and the sewage outlet.

[0031] Preferably, the anti-corrosion coating on the outer surface of the riser body and the spiral baffle is three or more layers of anti-corrosion paint.

[0032] Preferably, the anti-corrosion coating applied to the portion of the riser body near the partition and the side of the partition facing the water accumulation portion of the riser body is a solvent-free liquid epoxy coating.

[0033] The coating height of the solvent-free liquid epoxy coating inside the main body of the riser is not less than 500mm;

[0034] The solvent-free liquid epoxy coating has a uniform, glossy, and consistent color, and is free from pinholes, runs, and exposed substrate.

[0035] Preferably, the outer wall of the small cylinder is provided with a lifting lug located between the spiral baffle and the variable diameter section.

[0036] The beneficial effects of this utility model are:

[0037] This invention realizes stress relief at the natural gas inlet of the vent riser, enhancing the safety, stability, and reliability of the equipment.

[0038] This utility model has a structure that facilitates operation and maintenance and reduces equipment maintenance costs.

[0039] This invention effectively improves the safety and service life of the vent riser, ensuring the safe and stable operation of long-distance natural gas pipelines.

[0040] This invention sets the opening pipe at a downward 45° angle, which changes the flow direction of natural gas during venting. This effectively avoids fatigue cracks and sealing failures caused by stress concentration at the pipe opening, greatly improves the safety of the venting riser, enhances the structural stability of the venting riser, thereby extending the service life of the venting riser, reducing maintenance and replacement costs, and ensuring the safe operation of long-distance natural gas pipelines.

[0041] The following will further explain the concept, specific structure and technical effects of this utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of this utility model. Attached Figure Description

[0042] Figure 1 A schematic diagram of an embodiment of the present invention is shown.

[0043] The components include: 1. Bolt seat; 1-1. Bolt seat base plate; 1-2. Bolt seat stiffener plate; 1-3. Bolt seat ring plate; 1-4. Bolt seat pad plate; 2. Riser body; 2-1. Large cylinder; 2-2. Partition plate; 2-3. Variable diameter section; 2-4. Small cylinder; 3. Second high-pressure vent; 3-1. Second high-pressure vent flange; 3-2. Second high-pressure vent connector; 4. Medium-pressure vent; 4-1. Medium-pressure vent flange; 4-2. Medium-pressure vent connector; 5. First high-pressure vent; 5-1. First high-pressure vent flange; 5-2. First high-pressure vent connector; 6. Manhole; 7. Drain outlet; 7-1. Drain outlet connector; 7-2. Drain valve; 7-3. Drain elbow; 8. Lifting lug; 9. Spiral baffle. Detailed Implementation

[0044] Example: Figure 1 As shown, a stress-relief-based venting riser for long-distance natural gas pipelines includes a riser body 2.

[0045] The main body 2 of the riser is a variable diameter structure, including a large cylinder 2-1, a small cylinder 2-4, and a variable diameter section 2-3 set between the large cylinder 2-1 and the small cylinder 2-4;

[0046] The diameter of the large cylinder 2-1 is larger than the diameter of the small cylinder 2-4;

[0047] The variable diameter section 2-3 is a tapered tube with the head removed. The end with the smaller diameter is connected to the small cylinder 2-4, and the end with the larger diameter is connected to the large cylinder 2-1.

[0048] The pipe wall of the large cylinder 2-1 is provided with a first high-pressure vent 5, a medium-pressure vent 4, a second high-pressure vent 3 and a drain outlet 7 in sequence from one end connected to the reducing section 2-3 to the other end. It is connected to the long-distance natural gas pipeline through the first high-pressure vent 5, the medium-pressure vent 4 and / or the second high-pressure vent 3, and the natural gas is released through the end of the small cylinder 2-4 away from the reducing section 2-3.

[0049] The first high-pressure vent 5, the medium-pressure vent 4, and the second high-pressure vent 3 form an angle of 45 degrees ± 2 degrees with the end of the large cylinder 2-1 that is away from the diameter-changing section 2-3.

[0050] The drain outlet 7 is set perpendicularly to the main cylinder 2-1;

[0051] Inside the large cylindrical body 2-1, a partition 2-3 is provided at the location of the sewage outlet 7, which is inclined to the axis.

[0052] The outer wall of the small cylinder 2-4 is provided with a spiral baffle 9 with the axial direction of the small cylinder 2-4 as the axis;

[0053] The outer surface of the riser body 2, the spiral baffle 9, the part of the riser body 2 near the baffle 2-3, and the side of the baffle 2-3 facing the water accumulation part inside the riser body 2 are all coated with an anti-corrosion coating.

[0054] In this invention, the spiral-shaped baffle 9 can change the airflow pattern, reduce the lift and drag generated by wind load, and reduce the possibility of wind-induced vibration. Especially in windy weather or high-altitude, windy areas, it can improve the stability of the vent riser under wind load and effectively reduce the deflection effect of wind load on the vent riser.

[0055] The drain outlet 7 can easily drain rainwater and other impurities from the present invention, which not only effectively reduces corrosion and improves the safety of the drain riser, but also eliminates the need to connect a drain pipe, thus improving economy.

[0056] In some embodiments, a bolt seat 1 is provided at the end of the large cylinder 2-1 away from the diameter-changing section 2-3, and the bolt seat 1 is used to fix it to the civil foundation.

[0057] In some embodiments, the bolt seat 1 includes a bolt seat base plate 1-1 disposed at one end of the large cylinder 2-1 away from the diameter-changing section 2-3, a bolt seat ring plate 1-3 disposed between the bolt seat base plate 1-1 and the drain port 7 and disposed parallel to the bolt seat base plate 1-1, and a plurality of bolt seat stiffeners 1-2 disposed between the bolt seat base plate 1-1 and the bolt seat ring plate 1-3.

[0058] The bolt seat base plate 1-1 is an annular or circular plate, and is welded and fixed to the end of the large cylinder 2-1 away from the diameter-changing section 2-3;

[0059] The bolt seat ring plate 1-3 is an annular plate, and its inner hole is welded and fixed to the outer wall of the large cylinder 2-1 located between the bolt seat bottom plate 1-1 and the drain outlet 7.

[0060] All bolt seat stiffeners 1-2 are rectangular, evenly distributed axially around the large cylinder 2-1, and are welded and fixed to the bolt seat base plate 1-1, bolt seat ring plate 1-3, and the outer wall of the large cylinder 2-1.

[0061] In some embodiments, the first high-pressure vent 5 includes a first high-pressure vent pipe 5-1 connected at one end to the large cylinder 2-1, and a first high-pressure vent flange 5-2 disposed at the other end of the first high-pressure vent pipe 5-1.

[0062] The medium-pressure vent port 4 includes a medium-pressure vent port pipe 4-1 connected at one end to the large cylinder 2-1, and a medium-pressure vent port flange 4-2 provided at the other end of the medium-pressure vent port pipe 4-1.

[0063] The second high-pressure vent 3 includes a second high-pressure vent pipe 3-1 connected at one end to the large cylinder 2-1, and a second high-pressure vent flange 3-2 provided at the other end of the second high-pressure vent pipe 3-1;

[0064] The drain outlet 7 includes a drain outlet pipe 7-1 connected to the large cylinder 2-1 at one end, a drain valve 7-2 installed in the drain outlet pipe 7-1, and a drain elbow 7-3 installed at the other end of the drain outlet pipe 7-1.

[0065] In some embodiments, the natural gas long-distance pipeline is fastened to the first high-pressure vent 5, the medium-pressure vent 4, and / or the second high-pressure vent 3 by means of flanges and bolts, and sealed by means of gaskets.

[0066] In some embodiments, the spiral baffle 9 is made of Q235B flat steel and is fixed to the small cylinder 2-4 by welding.

[0067] In some embodiments, the pipe wall of the large cylinder 2-1 is provided with a handhole 6 located between the second high-pressure vent 3 and the drain outlet 7.

[0068] In some embodiments, the anti-corrosion coating on the outer surface of the riser body 2 and the spiral baffle 9 consists of three or more layers of anti-corrosion paint.

[0069] In some embodiments, the anti-corrosion coating applied to the portion of the riser body 2 near the partition 2-3, and to the side of the partition 2-3 facing the water accumulation portion inside the riser body 2, is a solvent-free liquid epoxy coating.

[0070] The coating height of the solvent-free liquid epoxy coating inside the main body 2 of the riser shall not be less than 500mm;

[0071] Solvent-free liquid epoxy coatings produce a uniform, glossy, and consistent color finish, free from pinholes, runs, and exposed substrate.

[0072] In some embodiments, the outer wall of the small cylinder 2-4 is provided with a lifting lug 8 located between the spiral baffle 9 and the variable diameter section 2-3.

[0073] In practical applications, after the invention is manufactured, it is transported to the site for hoisting and positioning, and finally connected to the long-distance natural gas pipeline and the matching nuts are tightened.

[0074] In actual use, when a natural gas long-distance pipeline needs to be vented, the natural gas enters through the first high-pressure vent 5, the medium-pressure vent 4 and the second high-pressure vent 3, which are inclined downwards at 45°, and is discharged into the atmosphere through the top opening.

[0075] Due to the special angle design of the first high-pressure vent 5, the medium-pressure vent 4, and the second high-pressure vent 3, the impact force generated by the natural gas flow is effectively dispersed, and the stress at the pipe opening is significantly reduced.

[0076] The spiral baffle 9 of this invention increases stability; at the same time, the anti-corrosion coating prevents corrosion from the external environment, thus ensuring the safe and stable operation and long service life of this invention.

[0077] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A vent riser for long-distance natural gas pipelines based on stress relief; characterized in that, Including the main body of the riser (2); The main body (2) of the riser is a variable diameter structure, including a large cylinder (2-1), a small cylinder (2-4), and a variable diameter section (2-3) disposed between the large cylinder (2-1) and the small cylinder (2-4); The diameter of the large cylindrical body (2-1) is larger than the diameter of the small cylindrical body (2-4); The variable diameter section (2-3) is a tapered tube with the head removed. The end with the smaller diameter is connected to the small cylinder (2-4), and the end with the larger diameter is connected to the large cylinder (2-1). The pipe wall of the large cylinder (2-1) is provided with a first high-pressure vent (5), a medium-pressure vent (4), a second high-pressure vent (3) and a drain (7) sequentially from one end connected to the variable diameter section (2-3) to the other end. It is connected to the long-distance natural gas pipeline through the first high-pressure vent (5), the medium-pressure vent (4) and / or the second high-pressure vent (3), and natural gas is released through the end of the small cylinder (2-4) away from the variable diameter section (2-3). The first high-pressure vent (5), the medium-pressure vent (4) and the second high-pressure vent (3) form an angle of 45 degrees ± 2 degrees with the end of the large cylinder (2-1) away from the variable diameter section (2-3); The sewage outlet (7) is set perpendicular to the large cylinder (2-1); Inside the large cylindrical body (2-1), a partition (2-2) is provided at the location of the sewage outlet (7) and is inclined to the axis; The outer wall of the small cylinder (2-4) is provided with a spiral baffle (9) with the axis of the small cylinder (2-4) as the axis; The outer surface of the riser body (2), the spiral baffle (9), the part of the riser body (2) near the partition (2-2), and the side of the partition (2-2) facing the water accumulation part inside the riser body (2) are all coated with an anti-corrosion coating.

2. The stress-relief-based venting riser for long-distance natural gas pipelines according to claim 1, characterized in that, The large cylindrical body (2-1) is provided with a bolt seat (1) at the end away from the variable diameter section (2-3), and is fixed to the civil foundation through the bolt seat (1).

3. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 2, characterized in that, The bolt seat (1) includes a bolt seat base plate (1-1) disposed at one end of the large cylinder (2-1) away from the variable diameter section (2-3), a bolt seat ring plate (1-3) disposed between the bolt seat base plate (1-1) and the drain port (7) and disposed parallel to the bolt seat base plate (1-1), and a plurality of bolt seat stiffeners (1-2) disposed between the bolt seat base plate (1-1) and the bolt seat ring plate (1-3); The bolt seat base plate (1-1) is an annular or circular plate, and is welded and fixed to the end of the large cylinder (2-1) away from the variable diameter section (2-3); The bolt seat ring plate (1-3) is annular in shape, and its inner hole is welded and fixed to the outer wall of the large cylinder (2-1) located between the bolt seat bottom plate (1-1) and the drain port (7). All the bolt seat stiffeners (1-2) are rectangular and are evenly distributed around the axial direction of the large cylinder (2-1). They are all welded and fixed to the bolt seat base plate (1-1), the bolt seat ring plate (1-3), and the outer wall of the large cylinder (2-1).

4. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The first high-pressure vent (5) includes a first high-pressure vent pipe (5-1) connected at one end to the large cylinder (2-1), and a first high-pressure vent flange (5-2) disposed at the other end of the first high-pressure vent pipe (5-1); The medium-pressure vent (4) includes a medium-pressure vent pipe (4-1) connected at one end to the large cylinder (2-1), and a medium-pressure vent flange (4-2) disposed at the other end of the medium-pressure vent pipe (4-1); The second high-pressure vent (3) includes a second high-pressure vent pipe (3-1) connected at one end to the large cylinder (2-1), and a second high-pressure vent flange (3-2) disposed at the other end of the second high-pressure vent pipe (3-1); The drain outlet (7) includes a drain outlet pipe (7-1) connected to the large cylinder (2-1) at one end, a drain valve (7-2) provided on the drain outlet pipe (7-1), and a drain elbow (7-3) provided on the other end of the drain outlet pipe (7-1).

5. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The natural gas long-distance pipeline is fastened to the first high-pressure vent (5), the medium-pressure vent (4), and / or the second high-pressure vent (3) by means of flanges and bolts, and sealed by means of gaskets.

6. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The spiral baffle (9) is made of Q235B flat steel and is fixed to the small cylinder (2-4) by welding.

7. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The pipe wall of the large cylinder (2-1) is provided with a hand hole (6) located between the second high-pressure vent (3) and the sewage outlet (7).

8. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The anti-corrosion coating on the outer surface of the riser body (2) and the spiral baffle (9) consists of three or more layers of anti-corrosion paint.

9. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The anti-corrosion coating applied to the part of the riser body (2) near the partition (2-2) and the side of the partition (2-2) facing the water accumulation part inside the riser body (2) is a solvent-free liquid epoxy coating. The coating height of the solvent-free liquid epoxy coating inside the riser body (2) shall not be less than 500 mm; The solvent-free liquid epoxy coating has a uniform, glossy, and consistent color, and is free from pinholes, runs, and exposed substrate.

10. The stress-relief-based vent riser for long-distance natural gas pipelines according to claim 1, characterized in that, The outer wall of the small cylindrical body (2-4) is provided with a lifting lug (8) located between the spiral baffle (9) and the variable diameter section (2-3).

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