A natural gas pipeline explosion-proof metal hose

Abstract

The present invention relates to the field of metal hoses, and specifically to an explosion-proof metal hose for natural gas pipeline transportation, which solves the problems of low strength and large flow rate of existing metal hoses. It includes a metal hose. On one side of the metal hose, there is a fixed group of a flange and a loose flange. On the other side of the metal hose, there is a butt welding flange for fixation. The metal hose is covered with a steel strip of a multi-layer structure. Both ends of the metal hose and the steel strip are fixed through the cooperation of a metal short section and a compression collar. A reinforcing ring is wound around the metal hose. The structure of the existing metal hose is optimized in this device. A reinforcing ring is designed in the metal hose, which improves the strength of the metal hose and achieves the dual explosion-proof effect of the metal hose. At the same time, the structure of the steel strip wound around the existing metal hose is optimized. Through the change of the winding sequence, the steel strips wrapped around the outer layer of the corrugated pipe are in misaligned contact with each other, suppressing the generation of frictional static electricity.

Description

Technical Field

[0001] The present invention relates to the field of metal hoses, and particularly to an explosion-proof metal hose for natural gas pipeline transportation. Background Art

[0002] In the natural gas transportation and petrochemical industries, reciprocating compressors are most commonly used. During the operation of pipelines, they mostly suffer from alternating loads and are in a high-pressure state. In the domestic oil and gas field areas, high-pressure natural gas or gas has caused flash explosions and fires due to the formation of static electricity during the pipeline leakage process on many occasions, resulting in heavy casualties and losses of human and material resources. Moreover, incidents of hydrogen sulfide poisoning caused by natural gas leakage (blowout) also occur occasionally in the domestic and foreign oil and gas field industries.

[0003] The use of metal hoses not only achieves better compensation for the axial expansion and radial offset of pipelines but also plays a shock-absorbing role, reducing the damage caused by alternating loads. However, ordinary metal hoses have low strength and weak high-pressure resistance, resulting in a tendency for the metal hoses to burst and leak, causing significant losses to enterprises. Since metal hoses are the weak links in the natural gas compression and transportation pipeline network system, once the combustible gas under high pressure leaks, the high-pressure natural gas is prone to generate static sparks and static flash explosions due to the large flow rate and friction at the nozzle. Moreover, the natural gas in gas fields contains hydrogen sulfide, chloride ions, and other minerals. The leakage of natural gas containing these harmful components will also cause harm to people and livestock in the surrounding area or pollute the environment, with extremely high potential safety risks. Summary of the Invention

[0004] The present invention provides an explosion-proof metal hose for natural gas pipeline transportation, aiming to solve the problems of low strength and large flow rate of existing metal hoses.

[0005] To achieve the above object, the technical solution adopted by the present invention is specifically as follows:

[0006] An explosion-proof metal hose for natural gas pipeline transportation includes a metal hose 5. A fixed group of a flange 1 and a loose flange 2 is arranged on one side of the metal hose 5, and a butt weld flange 9 is arranged on the other side of the metal hose 5 for fixation. It is characterized in that: the metal hose 5 is covered with a steel strip 7 having a multi-layer structure, and both ends of the metal hose 5 and the steel strip 7 are fixed through the cooperation of a metal nipple 3 and a compression collar 4. A reinforcing ring 6 is wound around the metal hose 5.

[0007] Both ends of the metal hose 5 are connected to the metal nipple 3 through end rings 8.

[0008] The metal hose 5 adopts a corrugated pipe structure.

[0009] Both the flange 1 and the butt weld flange 9 are fixed to both ends of the metal nipple 3 through a first weld 10, and the first weld 10 adopts a Y-shaped weld.

[0010] The compression collar 4 is fixed to the metal nipple 3 through the second weld joint 11, and the second weld joint 11 adopts an over fillet weld.

[0011] Both ends of the steel strip 7 are fixedly nested between the metal nipple 3 and the compression collar 4.

[0012] The reinforcing ring 6 is wound around the trough of the corrugated pipe of the metal hose 5.

[0013] The structure of the steel strip 7 includes three or more layers, and the layers are in staggered contact with each other.

[0014] The beneficial effects of the present invention are as follows: 1. Through technical improvement, the present invention optimizes the structure of the existing metal hose. A reinforcing ring is designed in the metal hose, which improves the strength of the metal hose, achieves the dual explosion-proof effect of the metal hose, reduces the accident rate, and also extends its service life.

[0015] 2. The present invention optimizes the structure of the steel strip wound on the existing metal hose. By changing the winding sequence, the steel strips wrapped around the outer layer of the corrugated pipe are in staggered contact with each other. For the staggered contact metal steel strips, each surface layer covers the steel strip gaps of the lower layer, and they are covered layer by layer in sequence. The outflow path of the leaked gas changes from a straight line type to a numerous winding type, achieving a multi-stage pressure reduction effect, reducing the natural gas leakage speed successively until it is close to zero, thereby suppressing the generation of frictional static electricity. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention;

[0018] Figure 3 is Figure 2 the enlarged view at A in

[0019] Figure 4 is Figure 2 the enlarged view at B in

[0020] Figure 5 is Figure 2 the enlarged view at C in

[0021] Figure 6 is Figure 2 the enlarged view at D in

[0022] Figure 7 is Figure 2 the enlarged view at E in

[0023] Figure 8 is a schematic diagram of the steel strip structure;

[0024] Figure 9It is a comparison diagram of the existing steel strip and the traditional steel strip;

[0025] As shown in the figure: small flange 1, loose flange 2, metal nipple 3, compression collar 4, metal hose 5, reinforcing ring 6, steel strip 7, end ring 8, butt welding flange 9, first weld joint 10, second weld joint 11. Specific implementation mode

[0026] The technical solution of the present invention will be further described below in conjunction with the attached drawings and through specific embodiments:

[0027] Such as Figures 1 - 9 A natural gas pipeline explosion-proof metal hose shown is described in detail in the following installation structure:

[0028] Such as Figure 1 And Figure 2 As shown, this device uses the metal hose 5 as the base body, and the steel strip 7 is wrapped on the outer surface of the metal hose 5. Metal nipples 3 with a cylindrical structure are installed at both ends of the metal hose 5. In order to make the contact between the metal nipple 3 and the metal hose 5 stable, an end ring 8 is provided between the metal nipple 3 and the metal hose 5, as Figure 5 shown.

[0029] In order to make the metal nipple 3, the metal hose 5 and the steel strip 7 stable, the compression collar 4 structure is selected. The installation structure is as Figure 3 shown. The compression collar 4 is fixedly welded to the metal nipple 3, and the weld joint is the second weld joint 11. This weld joint adopts a fillet weld according to the on-site welding situation, as Figure 6 shown. Before welding the metal nipple 3 and the compression collar 4, the end of the steel strip 7 is placed between the metal nipple 3 and the compression collar 4 to ensure the stability of the steel strip 7 after welding, and then the metal nipple 3, the compression collar 4, the metal hose 5 and the steel strip 7 form a stable whole.

[0030] After forming the whole, it is necessary to install and fix this whole, as Figure 1 shown. At the left end of the whole, an installation end with a combined structure of a small flange 1 and a loose flange 2 is adopted, and at the right end of the whole, an installation end with a butt welding flange 9 is adopted, and then it is fixed through a bolt structure.

[0031] Both of the two metal nipples 3 are welded to the small flange 1 and the butt welding flange 9 by the first weld joint 10, and the weld joint adopts a Y-shaped weld.

[0032] Embodiment 1:

[0033] Such as Figures 1 - 9 A natural gas pipeline explosion-proof metal hose shown aims to solve the problem that because the natural gas leakage flow rate is large, it is easy to generate static sparks and static flash explosions by friction at the nozzle. To solve the above problems, this device adopts a different steel strip 7 design. The specific installation is as follows:

[0034] As Figure 1 and Figure 2 shown, the device uses a metal hose 5 as the base body, and a steel strip 7 is wrapped around the outer surface of the metal hose 5. Metal nipples 3 with a cylindrical structure are installed at both ends of the metal hose 5. To ensure stable contact between the metal nipple 3 and the metal hose 5, an end ring 8 is provided between the metal nipple 3 and the metal hose 5, as Figure 5 shown.

[0035] To keep the metal nipple 3, the metal hose 5 and the steel strip 7 stable, a compression collar 4 structure is selected. The installation structure is as Figure 3 shown. The compression collar 4 is fixedly welded to the metal nipple 3, and the weld joint is the second weld joint 11. According to the on-site welding situation, a fillet weld is used for this weld joint, as Figure 6 shown. Before welding the metal nipple 3 and the compression collar 4, the end of the steel strip 7 is placed between the metal nipple 3 and the compression collar 4 to ensure the stability of the steel strip 7 after welding, and then the metal nipple 3, the compression collar 4, the metal hose 5 and the steel strip 7 form a stable whole.

[0036] In this whole, the steel strip 7 is designed in a stacked manner with three or more layers. In this embodiment, a three-layer structure is adopted, as Figure 8 shown, which is divided into a bottom layer, a middle layer and a surface layer. The gaps between the three layers are all offset to achieve the effects of explosion protection and buffer leakage, and the buffer effect is as Figure 9 shown.

[0037] After forming the whole, it is necessary to install and fix this whole, as Figure 1 shown. At the left end of the whole, an installation end with a combination structure of a small flange 1 and a loose flange 2 is adopted, and at the right end of the whole, an installation end with a butt welding flange 9 is adopted, and then it is fixed through a bolt structure.

[0038] Both of the two metal nipples 3 and the small flange 1 and the butt welding flange 9 are welded with the first weld joint 10, and the weld joint adopts a Y-shaped weld.

[0039] Embodiment 2:

[0040] As Figures 1 - 9 shown, a natural gas pipeline explosion-proof metal hose aims to solve the problems that the strength of a common metal hose is relatively low, the high-pressure resistance ability is weak, and there is a tendency for the metal hose to burst and leak. To solve the above problems, an additional design of a reinforcing ring 6 is adopted in this device. The specific installation is as follows:

[0041] As Figures 1 - 9 shown, a natural gas pipeline explosion-proof metal hose aims to solve the problems that because the flow rate of natural gas leakage is large, it is easy to generate electrostatic sparks and electrostatic flash explosions by friction at the nozzle. To solve the above problems, a different design of the steel strip 7 is adopted in this device. The specific installation is as follows:

[0042] As Figure 1 and Figure 2 shown, the device uses the metal hose 5 as the base body, and a steel strip 7 is wrapped around the outer surface of the metal hose 5. Metal short joints 3 with a cylindrical structure are installed at both ends of the metal hose 5. In order to make the contact between the metal short joint 3 and the metal hose 5 stable, an end ring 8 is provided between the metal short joint 3 and the metal hose 5, as Figure 5 shown.

[0043] In order to make the metal hose 5 have high strength and high pressure resistance, the metal hose 5 adopts a spiral corrugated pipe structure, and the specific structure is as Figure 7 shown. A reinforcing ring 6 is wound around the metal hose 5 with a spiral corrugated pipe structure. A gap is reserved between the reinforcing ring 6 and the metal hose 5 for expansion compensation. At the same time, the reinforcing ring 6 is made of stainless steel material, which can play a dual explosion-proof role for the metal hose and enhance the strength of the metal hose 5.

[0044] In order to make the metal short joint 3, the metal hose 5 and the steel strip 7 stable, the structure of the compression binding ring 4 is selected. The installation structure is as Figure 3 shown. The compression binding ring 4 is fixedly welded to the metal short joint 3, and the weld joint is the second weld joint 11. This weld joint adopts an over-corner weld according to the on-site welding situation, as Figure 6 shown. Before welding the metal short joint 3 and the compression binding ring 4, the end of the steel strip 7 is placed between the metal short joint 3 and the compression binding ring 4 to ensure the stability of the steel strip 7 after welding, and then the metal short joint 3, the compression binding ring 4, the metal hose 5 and the steel strip 7 form a stable whole.

[0045] After forming the whole, it is necessary to install and fix this whole, as Figure 1 shown. At the left end of the whole, an installation end with a combined structure of a small flange 1 and a loose flange 2 is adopted, and at the right end of the whole, an installation end with a butt welding flange 9 is adopted, and then it is fixed through a bolt structure.

[0046] Both of the two metal short joints 3 and the small flange 1 and the butt welding flange 9 are welded by the first weld joint 10, and the weld joint adopts a Y-shaped weld.

[0047] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A natural gas pipeline explosion-proof metal hose, comprising a metal hose. A fixed group of a flange and a loose sleeve flange is arranged on one side of the metal hose, and a butt welding flange is arranged on the other side of the metal hose for fixation. It is characterized in that: A steel strip with a multi-layer structure covers the metal hose. Both ends of the metal hose and the steel strip are fixed through the cooperation of a metal nipple and a compression collar. A reinforcing ring is wound around the metal hose. Both ends of the metal hose are connected to the metal nipple through end rings. The reinforcing ring is wound at the wave trough of the corrugated pipe. Both the flange and the butt welding flange are fixed to the metal nipple through a first weld joint, and the first weld joint adopts a Y-shaped weld. The compression collar is fixed to the metal nipple through a second weld joint, and the second weld joint adopts an over-corner weld. Both ends of the steel strip are fixedly nested between the metal nipple and the compression collar. The steel strip structure includes more than three layers, and the layers are in staggered contact with each other.

2. The natural gas pipeline explosion-proof metal hose according to claim 1, It is characterized in that: The metal hose adopts a corrugated pipe structure.

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