Explosion-proof method for fire operation of open pipeline

Abstract

The invention belongs to the field of pipeline welding construction, and relates to an opening pipeline fire operation anti-explosion method. An operation opening is formed in the gas incoming upstream of the to-be-transformed cutting part of the pipeline. And a long-nozzle air bag is placed into the pipeline through the operation opening, and the long-nozzle air bag is filled with a medium till the pipeline is blocked by the long-nozzle air bag. The long-nozzle air bag has good deformability, can be suitable for pipelines of different specifications, and is good in universality. And after the pipeline is cut and transformed, the medium in the long-nozzle air bag is discharged, the long-nozzle air bag is taken out of the pipeline through the operation opening, and the operation opening is blocked. According to the device, flammable and explosive media can be effectively prevented from entering a fire operation point, the blocking effect is good, the device can be conveniently detached after operation, the long-nozzle air bag can be repeatedly used, and the device can be applied to pipelines of different specifications and is good in universality.

Description

Technical Field

[0001] The present invention belongs to the field of pipeline welding construction and relates to an explosion-proof method for hot work on an open pipeline. Background Art

[0002] When oil and gas fields, chemical plants, and devices for transporting flammable and explosive media are carrying out pipeline renovation construction, due to the presence of oil at the low point of the pipeline or oil sludge on the inner wall of the pipeline, after nitrogen replacement of the pipeline, it will continue to volatilize. The pipeline will no longer meet the standards within a certain period of time after the replacement is qualified. When making a hot work connection to such a pipeline, since the pipe opening is open to the air, air will enter the pipeline, and a flammable and explosive area will be formed in a local area. During hot work, there may be a risk of combustion and explosion.

[0003] Generally, the conventional methods for such operations are as follows: 1. Build a butter wall, but the butter wall is prone to collapse when heated and cannot be detected. Therefore, it cannot ensure the continuity of the butter wall during construction operations, and the operation risk is uncontrollable. At the same time, the butter wall cannot be removed after the operation, which may cause blockage at the valve or pipeline reducer. 2. Capsule plugging, but after some construction operations, the capsule cannot be removed, and the capsule is an inflatable capsule, which is prone to damage and failure when heated. Summary of the Invention

[0004] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an explosion-proof method for hot work on an open pipeline. The present invention can effectively prevent flammable and explosive media from entering the hot work point, and can be easily disassembled after the operation, and the long-nozzle airbag can be reused.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The present invention discloses an explosion-proof method for hot work on an open pipeline, including the following steps:

[0007] Open an operation port upstream of the gas inlet at the pipeline cutting part to be renovated;

[0008] Insert a long-nozzle airbag into the pipeline through the operation port, and fill the long-nozzle airbag with a medium until the long-nozzle airbag blocks the pipeline;

[0009] After completing the cutting and renovation of the pipeline, discharge the medium in the long-nozzle airbag, remove the long-nozzle airbag from the pipeline through the operation port, and block the operation port.

[0010] Further, insert a long-nozzle airbag into the pipeline through the operation port, inflate the long-nozzle airbag, and after inflation is completed, close the inflation port of the long-nozzle airbag and fix the inflation port of the long-nozzle airbag on the operation port.

[0011] Further, the long-nozzle airbag is in a strip shape, and the long-nozzle airbag is provided with a flared opening.

[0012] Further, a medium is filled into the long-nozzle airbag, and the medium is a non-combustible medium.

[0013] Further, the long-nozzle airbag is made of PE, PET, nylon, rubber or plastic.

[0014] Further, the operation port is blocked as follows:

[0015] A plug is embedded inside the operation port;

[0016] And a flange is installed on the operation port to complete the blocking.

[0017] Further, the operation port protrudes outward from the pipeline, and a fitting surface for fitting with the flange is provided on the operation port.

[0018] Further, the flange is fixed on the fitting surface of the operation port by bolts.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the present invention, an operation port is opened upstream of the incoming gas at the part of the pipeline to be reformed and cut. A long-nozzle airbag is inserted into the pipeline through the operation port, and a medium is filled into the long-nozzle airbag until the long-nozzle airbag blocks the pipeline. The long-nozzle airbag has good deformation ability and can be applied to pipelines of different specifications, with good versatility. After the cutting and reforming of the pipeline are completed, the medium in the long-nozzle airbag is discharged, and the long-nozzle airbag is taken out of the pipeline through the operation port, and the operation port is blocked. The present invention can effectively block flammable and explosive media from entering the hot work point, with good blocking effect, and can be conveniently disassembled after the operation, that is, the long-nozzle airbag can be reused and can be applied to pipelines of different specifications, with good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flowchart of the method of the present invention;

[0022] Figure 2 It is a structural diagram of an embodiment of the present invention;

[0023] Figure 3 It is a structural diagram of another embodiment of the present invention;

[0024] Figure 4 It is an effect diagram of the blocking of the present invention.

[0025] Wherein: 1, pipeline; 2, part to be reformed and cut; 3, operation port; 4, long-nozzle airbag. DETAILED DESCRIPTION OF THE INVENTION

[0026] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solution in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0028] The following further describes the present invention in detail with reference to the accompanying drawings:

[0029] See Figure 1 , the present invention discloses an explosion-proof method for hot work on an open pipeline, including the following steps:

[0030] S1. Open an operation port 3 upstream of the gas inlet at the part 2 to be modified and cut of the pipeline 1.

[0031] S2. Insert a long-nozzle airbag 4 into the pipeline 1 through the operation port 3, and fill the long-nozzle airbag 4 with a medium until the long-nozzle airbag 4 blocks the pipeline 1.

[0032] Insert a long-nozzle airbag 4 into the pipeline 1 through the operation port 3, inflate the long-nozzle airbag 4. After inflation is completed, close the inflation port of the long-nozzle airbag 4 and fix the inflation port of the long-nozzle airbag 4 on the operation port 3.

[0033] The long-nozzle airbag 4 is strip-shaped and the long-nozzle airbag 4 is provided with a flared opening.

[0034] Fill the long-nozzle airbag 4 with a medium, and the medium is a non-combustible medium.

[0035] The material of the long-nozzle airbag 4 is PE, PET, nylon, rubber or plastic.

[0036] S3. After completing the cutting and transformation of the pipeline 1, discharge the medium in the long-nozzle airbag 4, take out the long-nozzle airbag 4 from the pipeline 1 through the operation port 3, and block the operation port 3.

[0037] The plugging operation opening 3 is as follows:

[0038] Embed a plug inside the operation opening 3;

[0039] And install a flange on the operation opening 3 to complete the plugging.

[0040] The operation opening 3 protrudes outward from the outer side of the pipeline 1, and the operation opening 3 is provided with a fitting surface that fits the flange.

[0041] The flange is fixed on the fitting surface of the operation opening 3 through bolts.

[0042] See Figure 1 , in another feasible embodiment of the present invention, the following is adaptively modified according to the situation. An operation opening 3 is opened upstream of the incoming gas at the part 2 to be modified and cut of the pipeline 1. A long-nozzle airbag 4 is inserted into the pipeline 1 through the operation opening 3, and a medium is filled into the long-nozzle airbag 4 until the long-nozzle airbag 4 plugs the pipeline 1. The long-nozzle airbag 4 has good deformation ability and can be applied to pipelines 1 of different specifications, with good versatility. After the cutting and modification of the pipeline 1 are completed, the medium in the long-nozzle airbag 4 is discharged, and the long-nozzle airbag 4 is taken out of the pipeline 1 through the operation opening 3, and the operation opening 3 is plugged. The plugging effect of the present invention is good, the long-nozzle airbag 4 can be reused, and it can be applied to pipelines 1 of different specifications, with good versatility. See Figure 4 This is the plugging effect diagram of the present invention.

[0043] Embodiment 1:

[0044] See Figure 1 , this embodiment of the present invention discloses an explosion-proof method for hot work on an open pipeline, including the following steps:

[0045] S1. Open an operation opening 3 upstream of the incoming gas at the part 2 to be modified and cut of the pipeline 1;

[0046] S2. Insert a long-nozzle airbag 4 into the pipeline 1 through the operation opening 3, and fill a medium into the long-nozzle airbag 4 until the long-nozzle airbag 4 plugs the pipeline 1;

[0047] Insert a long-nozzle airbag 4 into the pipeline 1 through the operation opening 3, inflate the long-nozzle airbag 4, after the inflation is completed, close the inflation port of the long-nozzle airbag 4, and fix the inflation port of the long-nozzle airbag 4 on the operation opening 3.

[0048] The long - nozzle airbag 4 is generally made of rubber or plastic materials such as PE, PET or nylon, which has high elasticity and a certain thickness. It has a flared opening, is similar to a balloon, is in a long - strip shape when unfilled, and is spherical when filled with a filling medium. The long - nozzle airbag 4 can be filled with liquid or non - combustible gas, such as non - combustible gases like water and nitrogen. The long - nozzle airbag 4 expands under the action of filling with water or nitrogen, blocks the channel between the working weld and the low - pressure incoming gas, and clamps the mouth of the long - nozzle airbag 4 after it is filled to prevent the medium inside the long - nozzle airbag 4 from flowing out. During the weld operation, high temperature is generated and transferred to the sealing surface. Due to the protection and heat absorption of water inside the long - nozzle airbag 4, the temperature of the airbag can be reduced, ensuring the integrity of the long - nozzle airbag 4 within a certain period of time.

[0049] After completing the cutting and transformation of the pipeline 1, drain the medium inside the long - nozzle airbag 4, take out the long - nozzle airbag 4 from the pipeline 1 through the operation port 3, and seal the operation port 3.

[0050] After the operation is completed, drain the medium inside the long - nozzle airbag 4. The long - nozzle airbag 4 returns to its original size, is withdrawn from the operation port 3, and the operation port 3 is sealed. The sealing of the operation port 3 can be in the form of blind - plate sealing, threaded plug sealing, etc.

[0051] The long - nozzle airbag 4 presents an elliptical shape in the filled state, has a certain contact area with the pipe wall, undergoes a certain shape change under the low pressure on the blocking side in the pipe, and generates an opposite acting force with the pipe wall to block the low - pressure incoming gas.

[0052] The long - nozzle airbag 4 of the present invention can adopt two methods of injecting gas and injecting water, effectively blocking flammable and explosive media from entering the hot - work point, and can also be conveniently disassembled and reused after the operation.

[0053] Embodiment 2:

[0054] See Figure 1 , the present embodiment of the invention discloses an explosion - proof method for hot - work on an open pipeline, including the following steps:

[0055] S1. Open an operation port 3 upstream of the incoming gas at the part 2 to be transformed and cut of the pipeline 1. The operation port 3 is arranged on the lower side of the pipeline 1. See Figure 2 ;

[0056] S2. Place the long - nozzle airbag 4 into the pipeline 1 through the operation port 3, and fill the long - nozzle airbag 4 with a medium until the long - nozzle airbag 4 blocks the pipeline 1. When the operation port 3 is downward, see Figure 2 , it is convenient to fill the liquid. By observing the filling amount or the filling size of the airbag from the side of the weld, it can be judged whether further filling is required;

[0057] After the cutting and transformation of pipeline 1 are completed, untie the airbag nozzle. The liquid in the airbag is drained completely under the action of gravity and returns to its original size. Then, take out the long-nozzle airbag 4 from pipeline 1 through the operation port 3 and seal the operation port 3.

[0058] Embodiment 3:

[0059] Refer to Figure 1 , this embodiment of the present invention discloses an explosion-proof method for hot work on an open pipeline, including the following steps:

[0060] S1. Open an operation port 3 upstream of the gas inlet at the cutting part 2 to be transformed of pipeline 1. The operation port 3 is arranged on the upper side of pipeline 1. Refer to Figure 3 ;

[0061] S2. Place a long-nozzle airbag 4 into pipeline 1 through the operation port 3 and fill the long-nozzle airbag 4 with a medium until the long-nozzle airbag 4 seals pipeline 1;

[0062] S3. After the cutting and transformation of pipeline 1 are completed, drain the medium in the long-nozzle airbag 4, take out the long-nozzle airbag 4 from pipeline 1 through the operation port 3, and seal the operation port 3.

[0063] Refer to Figure 3 , when the operation port 3 is upward, it is convenient to fill the liquid. However, when draining the liquid, a suction machine must be used to suck out the liquid in the airbag. But when filling gases such as nitrogen, a suction machine is not required.

[0064] When reconstructing and constructing pipeline 1 in oil and gas fields, chemical plants, and inflammable and explosive medium transportation devices, since there is oil at the low point of pipeline 1 or there is oil sludge on the inner wall of pipeline 1, after nitrogen replacement of pipeline 1, it will continue to volatilize. Pipeline 1 will no longer be qualified for a period of time after the replacement is qualified. When making a hot work connection for such a pipeline 1, since the pipe orifice is open to the air, air will enter pipeline 1 and a flammable and explosive area will be formed in a local area. During hot work, there may be a risk of combustion and explosion. The present invention effectively blocks inflammable and explosive media from entering the hot work point and effectively eliminates the risk of combustion and explosion. Using a simple and easy method, by adding a construction port before the operation and innovating the long-nozzle capsule, which can be put in through the construction port and can be easily disassembled after the operation, the structure is simple, the construction is convenient, it is easy to disassemble and can be reused.

[0065] The above content is only to illustrate the technical idea of the present invention and cannot limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An explosion-proof method for hot work on an open pipeline, characterized in that, it includes the following steps: An operation port (3) is opened upstream of the gas inlet at the part (2) to be reconstructed and cut of the pipeline (1)(1); A long-nozzle airbag (4) is placed into the pipeline (1) through the operation port (3), and a medium is filled into the long-nozzle airbag (4) until the long-nozzle airbag (4) blocks the pipeline (1); After the cutting and reconstruction of the pipeline (1) are completed, the medium in the long-nozzle airbag (4) is discharged, the long-nozzle airbag (4) is taken out of the pipeline (1) through the operation port (3), and the operation port (3) is blocked.

2. An explosion-proof method for hot work on an open pipeline according to claim 1, characterized in that, the long-nozzle airbag (4) is placed into the pipeline (1) through the operation port (3), the long-nozzle airbag (4) is inflated, after the inflation is completed, the inflation port of the long-nozzle airbag (4) is closed, and the inflation port of the long-nozzle airbag (4) is fixed on the operation port (3).

3. An explosion-proof method for hot work on an open pipeline according to claim 2, characterized in that, the long-nozzle airbag (4) is in a strip shape, and the long-nozzle airbag (4) is provided with a flared opening.

4. An explosion-proof method for hot work on an open pipeline according to claim 3, characterized in that, the medium filled into the long-nozzle airbag (4) is a non-combustible medium.

5. An explosion-proof method for hot work on an open pipeline according to claim 4, characterized in that, the material of the long-nozzle airbag (4) is PE, PET, nylon, rubber or plastic.

6. An explosion-proof method for hot work on an open pipeline according to claim 1, characterized in that, the blocking of the operation port (3) is specifically as follows: A plug is embedded inside the operation port (3); And a flange is installed on the operation port (3) to complete the blocking.

7. An explosion-proof method for hot work on an open pipeline according to claim 6, characterized in that, the operation port (3) protrudes outward from the pipeline (1), and the operation port (3) is provided with a fitting surface that fits the flange.

8. An explosion-proof method for hot work on an open pipeline according to claim 7, characterized in that, the flange is fixed on the fitting surface of the operation port (3) by bolts.

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