Marine LNG ventilation double-wall pipe pressure test tool and pressure test method thereof

Abstract

The invention relates to a marine LNG ventilation double-wall pipe pressure test tool, and relates to the field of ship construction design, the marine LNG ventilation double-wall pipe pressure test tool comprises an inner wall pipe, the outer side of the inner wall pipe is sleeved with an outer wall pipe, a ventilation channel is formed between the inner wall pipe and the outer wall pipe, the outer wall pipe is fixedly connected with a sealing assembly relative to the ventilation channel, and the sealing assembly is fixedly connected with the inner wall pipe. A pressure test hole is formed in the sealing assembly, the ventilation channel is communicated with the outside through the pressure test hole, and a plugging piece is connected to the pressure test hole in a sealed mode. The double-wall pipe pressure test device has the advantages of solving the problem that double-wall pipe pressure test construction is complex, removing the procedures of welding, cutting, polishing and the like, and greatly improving the pressure test construction efficiency.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding design, and in particular to a pressure testing tool for a ship-used LNG ventilation double-wall pipe and a pressure testing method thereof. Background Art

[0002] In dual-fuel ships, equipment gas pipelines in dangerous areas of the engine room need to adopt a ventilated double-walled pipe design, which can effectively isolate the gas pipeline and reduce potential safety risks. During the shipbuilding process, after the double-walled pipe is installed, the inner and outer wall pipes need to be subjected to pressure and sealing tests to ensure the quality and safety of the pipelines.

[0003] For double-walled pipes after pressure testing, the existing construction method is usually to use welded sealing plates to seal the vents, except for the part with flanges at the end. This practice can effectively seal the vents and ensure that there will be no gas leakage or other safety problems during the pressure test. After the pressure test is completed, the pipeline needs to be pressure tested to verify the pressure resistance and sealing performance of the pipeline.

[0004] Once the pressure test is completed and passed the acceptance, the construction personnel will cut off the welded sealing plate so that the double-wall pipeline can be used normally. This construction process ensures the safety and integrity of the pipeline during the pressure test, and also provides protection for subsequent use and maintenance. Through strict pressure testing and inspection processes, the safe operation of the equipment gas pipeline in dual-fuel ships can be effectively ensured, ensuring the safety of the ship and crew.

[0005] Regarding the above-mentioned related technologies, the inventor believes that the double-walled gas pipe is made of stainless steel, and cutting off the pressure test sealing plate will damage the parent material, and requires welding and grinding, which is time-consuming and labor-intensive. The double-walled pipe in the equipment has a small space and construction is very difficult. Welding and cutting open flame operations are highly dangerous. Summary of the invention

[0006] In order to solve the complex problem of double-wall pipe pressure test construction, eliminate welding, cutting, grinding and other processes, and greatly improve the pressure test construction efficiency, the present application provides a ship-based LNG ventilation double-wall pipe pressure test tooling and a pressure test method thereof.

[0007] The present application provides a marine LNG ventilation double-wall pipe pressure test tool, which adopts the following technical solution:

[0008] A ship-based LNG ventilation double-wall pipe pressure test tool comprises an inner wall pipe, an outer wall pipe is sleeved on the outer side of the inner wall pipe, a ventilation channel is formed between the inner wall pipe and the outer wall pipe, a closing component is fixedly connected to the outer wall pipe relative to the ventilation channel, a pressure test hole is opened on the closing component, the pressure test hole connects the ventilation channel with the outside, and a plugging piece is sealed and connected to the pressure test hole.

[0009] Optionally, the sealing component includes a pressure test seat plate, the bottom wall of which is fixedly connected to the end of the outer wall tube, and the pressure test seat plate seals the end of the annular space formed between the inner wall tube and the outer wall tube.

[0010] Optionally, the blocking member is a sealing bolt, the sealing bolt extends into the interior of the pressure test hole, and the sealing bolt is threadedly connected to the pressure test seat plate.

[0011] Optionally, a seal is provided between the sealing bolt and the pressure test seat plate.

[0012] Optionally, the sealing element is a raw tape.

[0013] Optionally, a plurality of sealing members are arranged along the circumference of the pressure test seat plate.

[0014] Optionally, the pressure test hole is opposite to the ventilation channel, and the peripheral side of the pressure test hole is completely located inside the vertical projection of the ventilation channel.

[0015] The present application also provides a pressure test method, which is applied to the above-mentioned ship LNG ventilation double-wall pipe pressure test tooling, and the method comprises:

[0016] S01: During the double-wall pipe production stage, a pressure test seat plate with sealing bolts is welded in advance to seal the outer wall pipe end;

[0017] S02: After the double-walled pipe is fully installed on the ship, the system pressure test uses nitrogen or water pressure test at the ventilation test port of the outer wall pipe;

[0018] S03: After the pressure test is completed, remove the sealing bolts on the pressure test seat plate.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. Simple design, easy operation, no need for hot work, reducing the workload of workers.

[0021] 2. The pressure test process has been improved, which has greatly improved the operating efficiency and the process technology level.

[0022] 3. Improved economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a ship-based LNG ventilation double-wall pipe pressure test tooling in an embodiment of the present application.

[0024] Figure 2 It is a structural schematic diagram of a pressure test seat plate of a ship-used LNG ventilation double-wall pipe pressure test tooling in an embodiment of the present application.

[0025] Figure 3 It is a top view of a pressure test seat plate of a ship-used LNG ventilation double-wall pipe pressure test tooling in an embodiment of the present application.

[0026] Explanation of the reference numerals: 1. inner wall tube; 2. outer wall tube; 3. ventilation channel; 4. pressure test seat plate; 41. pressure test hole; 42. sealing bolt. DETAILED DESCRIPTION

[0027] In dual-fuel ships, equipment gas pipelines in dangerous areas of the engine room need to adopt a ventilated double-walled pipe design, which can effectively isolate the gas pipeline and reduce potential safety risks. During the shipbuilding process, after the double-walled pipe is installed, the inner and outer wall pipes need to be subjected to pressure and sealing tests to ensure the quality and safety of the pipelines.

[0028] For double-walled pipes after pressure testing, the existing construction method is usually to use welded sealing plates to seal the vents, except for the part with flanges at the end. This practice can effectively seal the vents and ensure that there will be no gas leakage or other safety problems during the pressure test. After the pressure test is completed, the pipeline needs to be pressure tested to verify the pressure resistance and sealing performance of the pipeline.

[0029] Once the pressure test is completed and passed the acceptance, the construction personnel will cut off the welded sealing plate so that the double-wall pipeline can be used normally. This construction process ensures the safety and integrity of the pipeline during the pressure test, and also provides protection for subsequent use and maintenance. Through strict pressure testing and inspection processes, the safe operation of the equipment gas pipeline in dual-fuel ships can be effectively ensured, ensuring the safety of the ship and crew.

[0030] Regarding the above-mentioned related technologies, the inventor believes that the double-walled gas pipe is made of stainless steel, and cutting off the pressure test sealing plate will damage the parent material, and requires welding and grinding, which is time-consuming and labor-intensive. The double-walled pipe in the equipment has a small space and construction is very difficult. Welding and cutting open flame operations are highly dangerous.

[0031] In order to solve the complex problem of double-wall pipe pressure test construction, eliminate welding, cutting, grinding and other processes, and greatly improve the pressure test construction efficiency, the present application provides a ship-based LNG ventilation double-wall pipe pressure test tooling and a pressure test method thereof.

[0032] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0034] The following is combined with Figure 1-3 This application is described in further detail.

[0035] The present application embodiment discloses a pressure test tool for a double-walled LNG ventilation pipe used on a ship. Figure 1 , Figure 2 A ship-used LNG ventilation double-wall pipe pressure test tool includes a vertically arranged inner wall pipe 1, an outer wall pipe 2 is sleeved on the outer side of the inner wall pipe 1, and the inner wall pipe 1 and the outer wall pipe 2 are coaxially arranged. A gap is left between the outer wall of the inner wall pipe 1 and the inner wall of the outer wall pipe 2 to form a ventilation channel 3, the ventilation channel 3 is an annular structure, and the ventilation channel 3 and the inner wall pipe 1 and the outer wall pipe 2 are coaxially arranged.

[0036] A pressure test seat plate 4 is horizontally arranged at the top of the outer wall tube 2. The pressure test seat plate 4 is a circular ring structure, and the pressure base is coaxially arranged with the outer wall tube 2. The bottom wall of the pressure test seat plate 4 is fixedly connected to the outer wall tube 2, and the inner side of the pressure test seat plate 4 is fixedly connected to the inner wall tube 1. The top side wall of the ventilation channel 3 is completely closed by the pressure test seat plate 4.

[0037] Reference Figure 2 , Figure 3 A pressure test hole 41 is vertically opened on the top wall of the pressure test seat plate 4. The pressure test hole 41 completely penetrates the pressure test seat plate 4, and the ventilation channel 3 between the inner wall tube 1 and the outer wall tube 2 is relatively connected to the outside through the pressure test hole 41. The pressure test hole 41 is opposite to the ventilation channel 3, and the vertical projection of the pressure test hole 41 is completely inside the vertical projection of the ventilation channel 3.

[0038] A sealing bolt 42 is disposed inside the pressure test hole 41 , and the sealing bolt 42 is threadedly connected to the pressure test seat plate 4 . The pressure test hole 41 is sealed by the sealing bolt 42 , thereby separating the ventilation channel 3 from the outside.

[0039] The sealing bolt 42 includes a threaded portion extending into the pressure hole and a driving portion located above the pressure test hole 41, the threaded portion is fixedly connected to the driving portion, and the threaded portion is threadedly connected to the pressure test seat plate 4, and the bottom wall of the driving portion is located on the upper surface of the pressure test seat plate 4. In some embodiments, the driving portion is a hexagonal structure, so that it is convenient for the operator to rotate the driving portion. In some embodiments, a raw tape is also provided between the threaded portion and the pressure test hole 41, and the raw tape provided outside the threaded portion improves the sealing effect between the threaded portion and the pressure test hole 41.

[0040] The present application also discloses a pressure test method, which is applied to the above-mentioned ship LNG ventilation double-wall pipe pressure test tooling, and the method comprises:

[0041] S01: During the double-wall pipe manufacturing stage, a pressure test seat plate 4 with sealing bolts 42 is welded in advance to seal the end of the outer wall pipe 2;

[0042] S02: After the double-walled pipe ship is fully installed, the system pressure test uses nitrogen or water pressure test at the ventilation detection port of the outer wall pipe 2;

[0043] S03: After the pressure test is completed, the sealing bolts 42 on the pressure test seat plate 4 are removed.

[0044] In this application, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A pressure test tool for marine LNG ventilation double-wall pipes, characterized in that: The invention comprises an inner wall tube (1), an outer wall tube (2) is sleeved on the outer side of the inner wall tube (1), a ventilation channel (3) is formed between the inner wall tube (1) and the outer wall tube (2), a sealing component is fixedly connected to the outer wall tube (2) relative to the ventilation channel (3), a pressure test hole (41) is opened on the sealing component, the pressure test hole (41) connects the ventilation channel (3) with the outside, and a sealing member is sealed and connected to the pressure test hole (41).

2. The pressure test tool for the marine LNG ventilation double-wall pipe according to claim 1 is characterized in that: The sealing component comprises a pressure test seat plate (4), the bottom wall of which is fixedly connected to the end of the outer wall tube (2), and the pressure test seat plate (4) seals the end of the annular space formed between the inner wall tube (1) and the outer wall tube (2).

3. The pressure test tool for the marine LNG ventilation double-wall pipe according to claim 1 is characterized in that: The blocking member is a sealing bolt (42), the sealing bolt (42) extends into the interior of the pressure test hole (41), and the sealing bolt (42) is threadedly connected to the pressure test seat plate (4).

4. The pressure test tool for the marine LNG ventilation double-wall pipe according to claim 3 is characterized in that: A sealing member is provided between the sealing bolt (42) and the pressure test seat plate (4).

5. The pressure test tool for the marine LNG ventilation double-wall pipe according to claim 4 is characterized in that: The sealing element is a raw tape.

6. The pressure test tool for the marine LNG ventilation double-wall pipe according to claim 1 is characterized in that: A plurality of sealing members are arranged along the circumference of the pressure test seat plate (4).

7. The pressure test tool for the marine LNG ventilation double-wall pipe according to claim 1 is characterized by: The pressure test hole (41) is opposite to the ventilation channel (3), and the peripheral side of the pressure test hole (41) is completely located inside the vertical projection of the ventilation channel (3).

8. A pressure testing method, characterized in that: The method applied to the pressure test fixture for the marine LNG ventilation double-wall pipe according to any one of claims 1 to 7 comprises: S01: During the double-wall pipe manufacturing stage, a pressure test seat plate (4) with sealing bolts (42) is welded in advance to seal the end of the outer wall pipe (2); S02: After the double-walled pipe ship is fully installed, the system is pressure tested by pressing nitrogen or water through the ventilation detection port of the outer wall pipe (2); S03: After the pressure test is completed, the sealing bolts (42) on the pressure test seat plate (4) are removed.

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