A plugging device and construction method for marine hose construction

Abstract

The present invention discloses a sealing device and a construction method for marine hose construction. The sealing device includes: a pipe cleaning ball, an end pressure plate, a connecting component and a pulling component. The pulling component consists of a pulling steel pipe and a lifting ring. The pulling steel pipe is a through pipe pre-buried in the pipe cleaning ball and coaxial with the pipe cleaning ball. The connecting component consists of a connecting steel pipe and a valve. The connecting steel pipe is a through pipe pre-buried in the pipe cleaning ball and non-coaxial with the pipe cleaning ball. The pipe cleaning ball adopts high-strength polyurethane foam, which has a larger contact area with the pipeline than the traditional form, has better pollution cleaning function and sealing, thereby preventing corrosion of the pipeline or pipe mouth flange and extending the life of the pipeline. The connecting component ensures the internal pressure balance of the pipe cleaning ball. The present invention is connected to the sea end flange before laying the pipeline to achieve good sealing. Therefore, after the pipeline is laid and connected to the submarine riser, when the device is dismantled, the seawater entering the riser can be brought out, further reducing the risk of pipeline corrosion.

Description

Technical Field

[0001] The present invention relates to a plugging device and a construction method, in particular to a plugging device and a construction method for marine hose construction, belonging to the technical field of marine hose construction. Background Art

[0002] During the underwater connection of the starting point of marine hose construction, a towing head is used to pull the connector at the front of the hose to the vicinity of the underwater riser flange. After the towing head is released, the riser flange and the hose connector flange are connected. The towing head needs to be removed during the connection process, and with the hose end left open, seawater can enter the hose. Seawater is highly corrosive to marine hose pipelines, and entering seawater can easily cause corrosion to the stainless steel skeleton within the hose. Since entering seawater is extremely difficult to displace, the medium within the pipeline is contaminated during transportation. Residual seawater can even corrode the metal skeleton within the hose over time, causing perforations that affect transportation safety. The commonly used solution during construction is to continuously inject fresh water from the upper end of the hose connected to the seabed riser on the construction vessel while the seawater entry end of the marine hose pipeline is open. The continuous outflow of fresh water ensures that no seawater enters the pipeline, thereby preventing seawater from seeping into the hose and causing corrosion. However, offshore freshwater resources are precious and costly, with poor construction economics, making them unsuitable for large-scale use. Especially when the pipe diameter is larger, more fresh water is required. Once the underwater docking time is long, the freshwater reserves are likely to be insufficient, causing construction accidents and affecting the freshwater supply for subsequent construction.

[0003] It is in this context that this patent application proposes a plugging device and a construction method for marine hose construction. Summary of the Invention

[0004] The main purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a plugging device and a construction method for marine hose construction.

[0005] The present invention is achieved by the following technical solutions:

[0006] A plugging device for marine hose construction, comprising a pigging ball, an end pressure plate, a connecting assembly and a pulling assembly.

[0007] The cleaning ball is a cylindrical column made of polyurethane foam, and the end pressure plates are respectively provided on both ends of the cleaning ball. The end pressure plates are thin plates made of stainless steel with holes for the connecting components and the pulling components to pass through.

[0008] The pulling assembly consists of a pulling steel pipe and a lifting ring. The pulling steel pipe is a through pipe pre-buried in the pigging sphere and coaxial with the pigging sphere. Both ends of the pulling steel pipe are processed with threads. The front end of the pulling steel pipe is connected to the lifting ring through threads. The pulling steel pipe is tightened to both sides of the end pressure plate by fastening nuts.

[0009] The connecting assembly consists of a connecting steel pipe and a valve. The connecting steel pipe is a through pipe pre-buried in the cleaning sphere and non-coaxial with the cleaning sphere. Both ends of the connecting steel pipe are processed with threads. The front end of the connecting steel pipe is connected to the valve through threads. The connecting steel pipe is tightened to both sides of the end pressure plate by fastening nuts.

[0010] The present invention also relates to a method for constructing a plugging device for marine hose construction, the method comprising the following steps:

[0011] Step S1: Complete the design and manufacture of the plugging device in accordance with the design and use requirements and transport it to the construction site. On the ship's deck, remove the protective shield and other parts of the initial section of the marine hose assembly, open the valve on the connecting assembly, insert the plugging device into the hole of the flange at the end of the marine hose assembly, insert it to a certain depth, close the valve, connect the shackle and the short-section wire rope single-branch lock to the ear seat pulling point of the towing head, bolt the towing head to the flange at the end of the marine hose assembly, install the sealing ring as required, and pre-tighten all bolts;

[0012] Step S2: Connect the pulling wire rope to pull the towing head and then drive the marine hose assembly to be lowered. Use the underwater pulley assembly pre-installed by the diver or underwater robot to pull the end of the marine hose assembly gradually into the water. Before entering the water, inject air into the other end of the marine hose assembly and adjust the air pressure according to the water depth. Since the pig ball has a certain interference fit, it can fit tightly against the inner wall of the hose to achieve a sealing effect, control the pressure deviation before and after the plugging device, balance the internal pressure of the plugging device with the water pressure of the external seawater depth, and ensure that the plugging device does not move. Gradually increase the pressure and pull the towing head to move the marine hose assembly to the vicinity of the platform riser flange;

[0013] Step S3: Remove the connecting bolts of the towing head, insert the sealing steel ring and other annular components that need to be installed, connect the wire rope of the pulling eye with the wire rope embedded in the riser, align the flange of the marine hose assembly with the riser flange with bolts and pull them closer, gradually insert the bolts in the circumferential holes, and pre-tighten all the connecting bolts according to the pre-tightening requirements;

[0014] Step S4: After the flange connection is completed, the pre-buried steel wire rope in the riser is pulled, and at the same time, the other end of the pipeline is appropriately pressurized to control the pulling force of the pre-buried steel wire rope not to exceed the allowable pulling force of the plugging device. The steel wire rope is continuously pulled so that the pipe cleaning ball gradually enters the riser and is gradually pushed out from the top of the riser, draining the seawater inside the riser and the front end of the hose connector. The plugging device is recovered and the construction ship is officially laid.

[0015] Beneficial effects of the present invention:

[0016] Due to the adoption of the above technical solution, the present invention adopts a high-strength polyurethane foam body with a polyurethane elastomer material on its surface, which plays a role in blocking the front and rear end pipelines while ensuring the deformation of the pipe cleaning ball and the pipeline cleaning effect. Compared with the traditional form, the contact area with the pipeline is larger, and it has better cleaning function and sealing, thereby preventing corrosion of the pipeline or pipe flange and extending the service life of the pipeline; the internal pressure balance of the pipe cleaning ball is ensured by the connecting component; the present invention can achieve better sealing by connecting to the sea end flange before laying the pipeline, so after laying the pipeline and connecting to the submarine riser, when the device is dismantled, the seawater entering the riser can be taken out together, which can further reduce the risk of pipeline corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the construction composition of a preferred embodiment of the present invention.

[0019] Among them: 1. Towing head; 2. Sealing device; 3. Marine hose assembly; 21. Pipe cleaning ball; 22. End pressure plate; 23. Connecting component; 24. Pulling component; 31. Flange; 32. Hose; 231. Connecting steel pipe; 232. Valve; 241. Pulling steel pipe; 242. Lifting ring. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] like Figure 1As shown: A plugging device for marine hose construction, including a pig sphere 21, an end pressure plate 22, a connecting component 23 and a pulling component 24. The pig sphere 21 is a cylindrical column made of polyurethane foam. The two end surfaces of the pig sphere 21 are respectively provided with end pressure plates 22. The end pressure plates 22 are thin plates made of stainless steel with holes for the connecting component 23 and the pulling component 24 to pass through. The pulling component 24 consists of a pulling steel pipe 241 and a lifting ring 242. The pulling steel pipe 241 is a through pipe pre-buried in the pig sphere 21 and coaxial with the pig sphere 21. The pulling steel pipe 241 is threaded at both ends, and the front end of the pulling steel pipe 241 is connected to a lifting ring 242 by a thread, and the pulling steel pipe 241 is pressed against both sides of the end pressure plate 22 by a fastening nut; the connecting component 23 is composed of a connecting steel pipe 231 and a valve 232. The connecting steel pipe 231 is a through pipe pre-buried in the cleaning sphere 21 and non-coaxial with the cleaning sphere 21. The connecting steel pipe 231 is threaded at both ends, and the front end of the connecting steel pipe 231 is connected to a valve 232 by a thread, and the connecting steel pipe 231 is pressed against both sides of the end pressure plate 22 by a fastening nut.

[0022] The present invention implements the steps:

[0023] like Figure 2 As shown, the plugging device 2 is designed and manufactured according to the design and use requirements and transported to the construction site. On the ship's deck, the protective shield and other parts of the starting section of the marine hose assembly 3 are removed. The valve 232 on the connecting component 23 is opened, and the plugging device 2 is inserted into the hole of the flange 31 at the end of the marine hose assembly 3. After it is inserted to a certain depth, the valve 232 is closed. The shackle and the single-branch lock of the short-section wire rope are connected to the ear seat pulling point of the towing head 1. The towing head 1 is bolted to the flange 31 at the end of the marine hose assembly 3. The sealing ring is installed as required and all bolts are pre-tightened.

[0024] The connecting pulling wire rope will pull the towing head 1 and then drive the marine hose assembly 3 to be lowered. The end of the marine hose assembly 3 will be pulled gradually into the water through the underwater pulley group pre-installed by the diver or underwater robot. Before entering the water, air is injected into the other end of the marine hose assembly 3 to adjust the air pressure according to the depth of entry into the water. Since the pig sphere 21 has a certain interference fit, it can be tightly attached to the inner wall of the hose 32 to achieve a sealing effect, control the pressure deviation before and after the plugging device 2, and balance the internal pressure of the plugging device 2 with the water pressure of the external seawater depth, so that the plugging device 2 will not move. Gradually pressurize and pull the towing head 1 to move the marine hose assembly 3 to the vicinity of the platform riser flange;

[0025] Remove the connecting bolts of the towing head 1, insert the sealing steel ring and other annular components that need to be installed, connect the wire rope of the pulling ring 242 to the wire rope embedded in the riser, use bolts to align the flange 31 of the marine hose assembly 3 with the riser flange and pull them closer, gradually insert the bolts in the circumferential holes, and pre-tighten all the connecting bolts according to the pre-tightening requirements;

[0026] After the flange connection is completed, the pre-buried steel wire rope in the riser is pulled, and at the same time, the pipeline at the other end is appropriately pressurized to control the pulling force of the pre-buried steel wire rope not to exceed the allowable pulling force of the plugging device 2. The steel wire rope is continuously pulled so that the pipe cleaning ball 21 gradually enters the riser and is gradually pushed out from the top of the riser, draining the seawater inside the riser and the front end of the hose connector. The plugging device 2 is recovered and the construction ship is officially laid.

[0027] The embodiments described are only part of the embodiments of the present invention, not all of them. Equivalent structures or equivalent processes based on the contents of the embodiment description of the present invention, directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for constructing a plugging device for marine hose construction, using a plugging device for marine hose construction, characterized in that: It comprises a pigging sphere (21), an end pressure plate (22), a connecting component (23) and a pulling component (24), The cleaning ball (21) is a cylindrical columnar body made of polyurethane foam, and the end pressure plates (22) are respectively provided on both end surfaces of the cleaning ball (21). The end pressure plates (22) are thin plates made of stainless steel with holes for the connecting component (23) and the pulling component (24) to pass through. The pulling assembly (24) is composed of a pulling steel pipe (241) and a hanging ring (242), wherein the pulling steel pipe (241) is a through pipe pre-buried in the cleaning sphere (21) and coaxial with the cleaning sphere (21), and both ends of the pulling steel pipe (241) are processed with threads, and the front end of the pulling steel pipe (241) is connected to the hanging ring (242) through threads, and the pulling steel pipe (241) is pressed against both sides of the end pressure plate (22) by tightening nuts; The connecting assembly (23) is composed of a connecting steel pipe (231) and a valve (232). The connecting steel pipe (231) is a through-pipe pre-buried in the cleaning sphere (21) and non-coaxial with the cleaning sphere (21). Both ends of the connecting steel pipe (231) are processed with threads. The front end of the connecting steel pipe (231) is connected to the valve (232) through threads. The connecting steel pipe (231) is pressed against both sides of the end pressure plate (22) by tightening nuts. The construction method uses the following steps: Step S1: Complete the design and manufacture of the plugging device (2) in accordance with the design and use requirements, transport it to the construction site, remove the protective shield of the starting section of the marine hose assembly (3) on the ship deck, open the valve (232) on the connecting component (23), insert the plugging device (2) into the hole of the flange (31) at the end of the marine hose assembly (3), insert it to a certain depth and close the valve (232), connect it to the ear seat pulling point of the towing head (1) through the shackle and the short section of the wire rope single lock, bolt the towing head (1) to the flange (31) at the end of the marine hose assembly (3), install the sealing ring and pre-tighten all the bolts as required; Step S2: Connect the pulling wire rope to pull the towing head (1) and then drive the marine hose assembly (3) to be lowered. Through the underwater pulley group pre-installed by the diver or the underwater robot, the end of the marine hose assembly (3) is pulled gradually into the water. Before entering the water, air is injected into the other end of the marine hose assembly (3) to adjust the air pressure according to the depth of the water. Since the cleaning ball (21) has a certain amount of interference, it can be tightly attached to the inner wall of the hose (32) to achieve a sealing effect, control the pressure deviation before and after the plugging device (2), balance the internal pressure of the plugging device (2) with the water pressure of the external seawater depth, and realize that the plugging device (2) will not move. Gradually pressurize and pull the towing head (1) to move the marine hose assembly (3) to the vicinity of the platform riser flange; Step S3: Remove the connecting bolts of the towing head (1), insert the annular component to be installed on the sealing steel ring, connect the wire rope of the pulling ring (242) with the wire rope pre-buried in the riser, align the flange (31) of the marine hose assembly (3) with the riser flange with bolts and pull them closer, gradually insert the bolts in the circumferential holes, and pre-tighten all the connecting bolts according to the pre-tightening requirements; Step S4: After the flange connection is completed, the pre-buried steel wire rope in the riser is pulled, and at the same time, the other end of the pipeline is appropriately pressurized to control the pulling force of the pre-buried steel wire rope not to exceed the allowable pulling force of the plugging device (2). The steel wire rope is continuously pulled so that the cleaning ball (21) gradually enters the riser and is gradually pushed out from the top of the riser, draining the seawater inside the riser and the front end of the hose connector. The plugging device (2) is recovered and the construction ship is officially laid.

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