A method and installation device for onshore installation of stern transport hose

Abstract

This invention relates to the field of ship installation technology, and discloses a shore-based installation method and device for stern-mounted flexible hoses. It overcomes site limitations, considering the confined space at the stern of an FPSO, by employing a simple installation device and utilizing land resources for operation. Even with limited space on the ship, rapid and accurate installation can be achieved. This invention minimizes damage during the installation of the stern-mounted flexible hose. During the connection process, an installation trolley is placed at three positions—fore, middle, and aft—to support the hose and prevent bending damage during connection. Furthermore, a specialized guide column is used during the retrieval of the stern-mounted flexible hose to the winch drum, improving installation efficiency and ensuring reliability. By controlling the radius of curvature at the inflection points of the stern-mounted flexible hose and the position of the lifting points, damage or breakage due to improper angle control at the inflection points is prevented. Pressure testing verifies the reliability of the connection and ensures connection quality.

Description

Technical Field

[0001] This invention relates to the field of ship installation technology, and in particular to a method and device for onshore installation of a stern delivery hose. Background Technology

[0002] With the rapid development of the marine oil and gas equipment manufacturing industry, FPSOs have gradually become one of the most widely used floating platforms. FPSO, or Floating Production Storage and Offloading Unit, processes, stores, and transports crude oil extracted at sea to oil tankers. The transport to the tankers mainly relies on the stern hoses installed at the stern of the FPSO. These hoses are connected by flanges and secured with a certain number of bolts, providing insulation, buoyancy, and transportation functions, playing a crucial role in offshore extraction. Therefore, achieving efficient and simple installation of the stern hoses has become a key aspect of FPSO construction. Various methods exist for installing stern hoses, but current methods suffer from low automation, long installation times in the water, potential damage to the hoses during installation, and inconsistent installation quality.

[0003] Patent application CN 102661443B discloses a method for installing oil hoses in a floating production storage and offloading (FPSO) unit. The method involves using a dock crane to sequentially lift and transport segmented oil hoses to appropriate positions on the deck of the FPSO unit. The key feature is that the oil hoses are installed directly on the deck using a moving tool and service hoist.

[0004] The existing installation method has problems such as low automation, long water occupation time, damage to the stern hose during installation, and inability to guarantee installation quality.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a shore-based installation device and method for a stern delivery hose. The shore-based installation device is convenient and safe to operate and avoids damage to the stern delivery hose. It is of great significance for reducing installation costs, improving the installation efficiency of the stern delivery hose, improving the connection reliability of each section of the hose, ensuring the safety of the stern delivery hose during the recovery process to the drum, and solving the space limitations of the FPSO stern.

[0007] The technical solution adopted in this invention is:

[0008] A method for installing a stern delivery hose includes the following steps:

[0009] Step 1: Clear a site on the approach bridge near the dock for connecting the stern hoses. Starting from the corresponding stern hose winch position, arrange the stern hoses in the direction of dock according to the connection sequence. Place three installation trolleys at each section of stern hose. Use the dockside crane, hose boom, and slings on the hoisting frame to lift all the stern hoses from the rack to the designated positions of the pre-placed installation trolleys arranged according to their numbers.

[0010] Step 2: Connect the stern hose in sequence. Secure the flange connection with 16 bolts. Tighten the bolts using a torque wrench with a rated torque of 600 N·m. Tighten the bolts in three stages: the first tightening is 30% of the rated torque, the second is 60%, and the third is 60%. Apply force symmetrically and evenly for each bolt tightening, in the following order: 1, 9, 5, 13, 2, 10, 6, 14, 3, 11, 7, 15, 4, 12, 8, 16.

[0011] Step 3: After all connections of the stern hose are completed, carefully check whether the connection sequence is correct and whether any gaskets between the flanges are missing;

[0012] Step 4: Secure the stern hose in the appropriate position and install a pressure testing blind flange and pressure gauge at the flange at the end of the stern hose;

[0013] Step 5: Use the water pump to start filling the entire stern hose with dock fire-fighting water until the entire set of stern hoses is filled with water. Start the pressure test pump to gradually increase the pressure to 12 bar. After the pressure value stabilizes, start the pressure holding time for 3 hours. Record the pressure value every 15 minutes. If the pressure drop is less than 5% within 3 hours and there is no leakage, the pressure test is qualified.

[0014] Step 6: Connect the entire hose to the winch drum. Install an emergency release valve at the hose interface of the winch drum and adjust it to a vertical position. Erect scaffolding below for the connection operation.

[0015] Step 7: Using the dockside crane, slings, and forklift on the lifting frame, send the entire stern hose to the winch drum along the pre-designed route, connect the head hose to the interface on the winch drum, seal the crude oil inlet end of the winch with a blind flange, and then perform another hydrostatic test according to the operation method in Step 5.

[0016] Step 8: After the pressure test, the rotating winch drum retracts all the stern delivery hoses in the direction of the stern delivery hose movement. The forklift pulls the stern delivery hoses forward in the horizontal direction to ensure that the installation trolley and the stern delivery hoses move smoothly. At the inflection point, the stern delivery hoses transition from horizontal to vertical direction with the assistance of the lifting frame and the forklift. The lifting frame continues to pull in the vertical direction, reaching the winch drum through another guide column. The two guide columns are arranged at the inflection point during the hoisting process of the stern delivery hoses. The stern delivery hoses are easy to slide when passing through them. The lifting frame and forklift are used to pull in the corresponding direction, while other forklifts are used to cooperate. The winch drum is operated to retract the stern delivery hoses at the same speed as the land speed.

[0017] Step 9: After the stern hose is retrieved, cover the stern hose and winch drum together with a three-proof cloth. If necessary, set up 5S protection to complete the operation.

[0018] Preferably, in step 8, the parameter relationship between the curvature radius R of the control at the inflection point and the radius R0 of the stern delivery hose is as follows: R>R0.

[0019] Preferably, in step 8, the method for determining the key parameters of the lifting frame during the retrieval of the stern delivery hose is as follows:

[0020] θ1+θ2=θ

[0021] L1 2 =R 2 +R1 2 -2RR1cosθ1

[0022] L2 2 =R 2 +R1 2 -2RR1cosθ2

[0023]

[0024] a=R1sinθ2

[0025] Where θ is the total angle at the inflection point, θ1 is the angle between the lifting point and the starting end of the inflection point, θ2 is the angle between the lifting point and the ending end of the inflection point, L1 is the length of the lifting rope at the starting end, L2 is the length of the lifting rope at the ending end, a is the horizontal distance between the lifting point and the ending end of the inflection point, b is the vertical distance between the lifting point and the ending end of the inflection point, and R1 is the distance between the lifting point and the center of the inflection point. The values ​​of a and b are known measured values. After the radius of curvature R of the inflection point is determined by the radius R0 of the stern transport hose, θ is a constant value. Then the variables L1, L2, θ1, and θ2 can be determined.

[0026] Preferably, in step 7, the head hose is connected to the emergency release valve on the winch drum.

[0027] Preferably, an installation device for a stern-mounted hose includes an installation trolley, a lifting frame, a forklift, operating tools, a guide column, and a winch drum. The installation trolley is positioned below the stern-mounted hose on the dock shore, the lifting frame is positioned above the stern-mounted hose and between it and the dock, the forklift is positioned between the stern-mounted hose and the dock, and the guide column is positioned at the inflection point during the hoisting process of the stern-mounted hose.

[0028] By adopting the above structure, considering the limited space at the stern of the FPSO, a simple installation device is used, and operations can be carried out using land resources. Even when space is limited, quick and accurate installation can be achieved.

[0029] Preferably, the stern hose consists of 25 hoses, including one head hose, twenty-three middle hoses, and one tail hose, which are connected in sequence by flanges and fixed with bolts.

[0030] By adopting the above structure, the stern hose can be sorted, marked, and hoisted, which can save hoisting costs and reduce the time required for on-site construction, thus facilitating efficient installation and reducing installation costs.

[0031] Preferably, the operating tools include a torque wrench, a pressure testing blind flange, a pressure gauge, a pressure testing pump, and a water injection pump.

[0032] By adopting the above structure, the operating tools are used for connecting each section of the hose and for subsequent hydrostatic testing, ensuring the accuracy of the stern hose connection.

[0033] Preferably, the hoisting frame is equipped with a dockside crane, flexible hose jacks, and slings.

[0034] By adopting the above structure, during the connection of each section of the stern hose, hoisting each section of the hose to the designated position is beneficial to improving the connection efficiency of the stern hose. During the retrieval of the stern hose, the stern hose is pulled forward according to the pre-set movement route of the stern hose, ensuring that the retrieval process of the stern hose is fast and efficient.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. This invention can solve site limitations. Considering the limited space at the stern of the FPSO, a simple installation device is used, which can be operated with the help of land resources. Even when the space of the hull is limited, it can achieve fast and accurate installation.

[0037] 2. This invention minimizes damage during the installation of the stern hose. During the connection of each hose section, an installation trolley is placed at each of the three positions (front, middle, and rear) to support the hose, avoiding bending damage during the connection process. In addition, a special guide column is used during the stern hose retraction to the winch drum, which improves installation efficiency and ensures installation reliability. Furthermore, by controlling the radius of curvature at the inflection point of the stern hose and the position of the lifting point, the stern hose will not be damaged or broken at the inflection point due to improper angle control.

[0038] 3. The installation quality of this invention is reliable. During the installation process, pressure tests are conducted after the stern conveying hose is fully connected and after the stern conveying hose is connected to the winch drum. This can verify the reliability of the connection and ensure the connection quality.

[0039] 4. This invention has the advantages of high integration, stable operation, low noise, easy installation, convenient operation and maintenance, and safety and reliability. In the preparation work, the stern delivery hose is sorted, marked and hoisted, which can save the hoisting cost of the stern delivery hose, reduce the time required for on-site construction, and facilitate the efficient installation of the stern delivery hose and reduce the installation cost of the stern delivery hose. Attached Figure Description

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0041] Figure 1 Flowchart of the stern delivery hose installation process of this invention;

[0042] Figure 2 This is a layout diagram of the stern hose installation device of the present invention;

[0043] Figure 3 This is a connection diagram of the stern delivery hose of the present invention;

[0044] Figure 4 This is a top view of the stern delivery hose recovery system of the present invention;

[0045] Figure 5 This is a diagram showing the location of the lifting points for the stern-mounted flexible hose of the present invention;

[0046] Figure 6 Schematic diagram of the catheter column of this invention;

[0047] Figure 7 This is a diagram showing the tightening sequence of the flange connection bolts for the stern transport hose of the present invention.

[0048] Among them: 10, installation trolley; 20, lifting frame; 30, forklift; 40, operating tools; 50, guide column; 60, stern hose; 70, winch drum; 80, emergency release valve; 61, head hose; 62, middle hose; 63, tail hose. Detailed Implementation

[0049] like Figure 1-7 As shown, a method for installing a stern hose includes the following steps:

[0050] Step 1: Clear a site on the approach bridge near the dock for connecting the stern hoses 60. Starting from the corresponding stern hose winch position, arrange the stern hoses 60 in the dock direction according to the connection sequence. Place three installation trolleys 10 at each stern hose 60 position in advance. Use the dock crane, hose boom, and slings on the hoisting frame 20 to lift all the stern hoses 60 from the rack to the designated positions of the pre-placed installation trolleys 10 arranged according to their numbers.

[0051] Step 2: Connect the stern hose 60 in sequence. Secure the flange connection with 16 bolts. Tighten the bolts with a torque wrench with a rated torque of 600 N.M. Tighten the bolts in three stages: the first tightening is 30% of the rated torque, the second is 60%, and the third is 60%. Apply force symmetrically and evenly for each bolt tightening, in the following order: 1, 9, 5, 13, 2, 10, 6, 14, 3, 11, 7, 15, 4, 12, 8, 16.

[0052] Step 3: After all connections of the stern hose 60 are completed, carefully check whether the connection sequence is correct and whether any gaskets between the flanges are missing;

[0053] Step 4: Secure the stern hose 60 in the appropriate position, and install a pressure testing blind flange and pressure gauge at the end flange of the tail hose 63;

[0054] Step 5: Use the water pump to start filling the entire string of stern hoses 60 with dock fire-fighting water until the entire string of stern hoses 60 is filled with water. Start the pressure test pump to gradually increase the pressure to 12 bar. After the pressure value stabilizes, start the pressure holding period for 3 hours. Record the pressure value every 15 minutes. If the pressure drop is less than 5% within 3 hours and there is no leakage, the pressure test is qualified.

[0055] Step 6: Connect the stern conveying hose 60 to the winch drum 70. Install the emergency release valve 80 at the hose interface of the winch drum 70 and adjust it to a vertical position. Set up scaffolding below for the connection operation.

[0056] Step 7: Using the quay crane, slings and forklift 30 on the lifting frame 20, send the whole stern transport hose 60 to the winch drum 70 according to the pre-designed route. Connect the head hose 61 to the interface on the winch drum 70. Connect the head hose 61 to the emergency release valve 80 on the winch drum 70. Seal the crude oil inlet end of the winch with a blind flange. Then, perform another hydrostatic test according to the operation method in Step 5.

[0057] Step 8: After the pressure test, the rotating winch drum 70 retracts all the stern delivery hoses 60 in the direction of movement of the stern delivery hoses 60. The forklift 30 pulls the stern delivery hoses 60 forward in the horizontal direction to ensure the smooth movement of the installation trolley 10 and the stern delivery hoses 60. At the inflection point, the stern delivery hoses 60, with the assistance of the lifting frame 20 and the forklift 30, complete the transition from horizontal to vertical direction via the guide column 50. The lifting frame 20 continues to pull in the vertical direction, reaching the winch drum 70 via another guide column 50. The two guide columns 50 are arranged at the inflection points during the hoisting process of the stern delivery hoses 60, which can control the relationship between the radius of curvature at the inflection point and the radius of the stern delivery hose 60, effectively... To mitigate the risk of damage or breakage of the stern hose 60, which is prone to sliding during transport, a lifting frame 20 and a forklift 30 are used for traction in the corresponding direction, with other forklifts 30 assisting. The winch drum 70 is operated to retrieve the stern hose 60 at the same speed as on land. An inflection point is set to ensure that the stern hose 60 minimizes damage due to bending during installation while allowing it to slide smoothly along the fixed device in both horizontal and vertical directions. The curvature radius R at the inflection point is controlled to maintain the following relationship with the radius R0 of the stern hose 60: R > R0. This ensures that the stern hose 60 is not damaged during retrieval. Additionally, if... Figure 5 As shown, the method for determining the key parameters of the lifting frame 20 during the recovery of the stern delivery hose 60 is as follows:

[0058] θ1+θ2=θ

[0059] L1 2 =R 2 +R1 2 -2RR1cosθ1

[0060] L2 2 =R 2 +R1 2 -2RR1cosθ2

[0061]

[0062] a=R1sinθ2

[0063] Where θ is the total angle at the inflection point, θ1 is the angle between the lifting point and the starting end of the inflection point, θ2 is the angle between the lifting point and the ending end of the inflection point, L1 is the length of the lifting rope at the starting end, L2 is the length of the lifting rope at the ending end, a is the horizontal distance between the lifting point and the ending end of the inflection point, b is the vertical distance between the lifting point and the ending end of the inflection point, and R1 is the distance between the lifting point and the center of the inflection point. The values ​​of a and b are known measured values. After the radius of curvature R of the inflection point is determined by the radius R0 of the stern transport hose 60, θ is a constant value, and then the variables L1, L2, θ1, and θ2 can be determined.

[0064] Step 9: After the stern hose 60 is retrieved, cover the stern hose 60 and the winch drum 70 with a three-proof cloth. If necessary, set up 5S protection to complete the operation.

[0065] This invention overcomes site limitations. Considering the limited space at the stern of an FPSO, it employs a simple installation device and utilizes land resources for operation, enabling rapid and accurate installation even with limited space. This invention minimizes damage to the stern hose 60 during installation. During the connection process, installation trolleys 10 are placed at three positions (front, middle, and rear) to support the hose, preventing bending damage during connection. Furthermore, a dedicated guide column 50 is used during the retrieval of the stern hose 60 to the winch drum 70, improving installation efficiency and reliability. By controlling the radius of curvature at the inflection points of the stern hose 60 and the position of the lifting points, the hose is prevented from breaking or snapping due to improper angle control at these points. This invention ensures reliable installation quality. Pressure tests are conducted after the stern hose 60 is fully connected and after it is connected to the winch drum 70, verifying the reliability of the connection and guaranteeing its quality.

[0066] like Figure 2As shown, an installation device for a stern-mounted hose includes an installation trolley 10, a lifting frame 20, a forklift 30, operating tools 40, a guide column 50, and a winch drum 70. The installation trolley 10 is positioned below the stern-mounted hose 60 on the dock shore. One installation trolley 10 is placed at the front, middle, and rear positions of each section of the stern-mounted hose 60 to support the hose and ensure its movement during retrieval. Using three trolleys helps prevent bending and deformation of the hose during connection and movement. The lifting frame 20 is positioned above the hose 60 and between it and the dock. The forklift 30 is positioned between the hose 60 and the dock, providing traction and assisting the crane in ensuring the hose moves steadily forward during retrieval. The guide column 50 is positioned at the turning points during the lifting of the hose 60. The stern hose 60 consists of 25 hoses, including one head hose 61, twenty-three middle hoses 62, and one tail hose 63, which are connected sequentially by flanges and secured with bolts. The operating tools 40 include a torque wrench, a pressure test blind flange, a pressure gauge, a pressure test pump, and a water injection pump, used for connecting each section of the hose and for subsequent hydrostatic testing. These are key equipment to ensure the accuracy of the stern hose 60 connection. The lifting frame 20 is equipped with a quay crane, hose lifting bar, and lifting slings. During the connection of each section of the stern hose 60, each section of the hose is lifted to a designated position, which helps improve the connection efficiency of the stern hose 60. During the retrieval of the stern hose 60, the stern hose 60 is pulled forward according to a pre-set movement route, ensuring a fast and efficient retrieval process. The installation device has advantages such as high integration, stable operation, low noise, easy installation, convenient operation and maintenance, and safety and reliability. In the preparation work, the stern hose 60 is sorted, marked and hoisted, which can save hoisting costs of the stern hose 60, reduce the time required for on-site construction, facilitate the efficient installation of the stern hose 60 and reduce the installation cost of the stern hose 60.

[0067] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should be included within the scope of protection defined by the claims of the present invention.

Claims

1. A method for installing a stern transport hose, characterized in that: Includes the following steps: Step 1: Clear a site on the approach bridge near the dock for connecting the stern hoses. Starting from the corresponding stern hose winch position, arrange the stern hoses in the direction of dock according to the connection sequence. Place three installation trolleys at each section of stern hose. Use the dockside crane, hose boom, and slings on the hoisting frame to lift all the stern hoses from the rack to the designated positions of the pre-placed installation trolleys arranged according to their numbers. Step 2: Connect the stern hose in sequence. Secure the flange connection with 16 bolts. Tighten the bolts with a torque wrench with a rated torque of 600 N.M. Tighten the bolts in three stages: the first tightening is 30% of the rated torque, the second is 60%, and the third is 60%. Apply force symmetrically and evenly for each bolt tightening, in the following order: 1, 9, 5, 13, 2, 10, 6, 14, 3, 11, 7, 15, 4, 12, 8, 16. Step 3: After all connections of the stern hose are completed, carefully check whether the connection sequence is correct and whether any gaskets between the flanges are missing; Step 4: Secure the stern hose in the appropriate position and install a pressure test blind flange and pressure gauge at the flange at the end of the stern hose; Step 5: Use the water pump to start filling the entire stern hose with dock fire-fighting water until the entire set of stern hoses is filled with water. Start the pressure test pump to gradually increase the pressure to 12 bar. After the pressure value stabilizes, start the pressure holding period for 3 hours. Record the pressure value every 15 minutes. If the pressure drop is less than 5% within 3 hours and there is no leakage, the pressure test is qualified. Step 6: Connect the stern conveying hose to the winch drum. Install an emergency release valve at the hose interface of the winch drum and adjust it to a vertical position. Erect scaffolding below for the connection operation. Step 7: Using the dockside crane, slings, and forklift on the lifting frame, send the entire stern hose to the winch drum along the pre-designed route, connect the head hose to the interface on the winch drum, seal the crude oil inlet end of the winch with a blind flange, and then perform another hydrostatic test according to the operation method in Step 5. Step 8: After the pressure test, the rotating winch drum retracts all the stern delivery hoses in the direction of the stern delivery hose movement. The forklift pulls the stern delivery hoses forward in the horizontal direction to ensure that the installation trolley and the stern delivery hoses move smoothly. At the inflection point, the stern delivery hoses transition from horizontal to vertical direction with the assistance of the lifting frame and the forklift. The lifting frame continues to pull in the vertical direction, reaching the winch drum through another guide column. The two guide columns are arranged at the inflection point during the hoisting process of the stern delivery hoses. The stern delivery hoses are easy to slide when passing through them. The lifting frame and forklift are used to pull in the corresponding direction, while other forklifts are used to cooperate. The winch drum is operated to retract the stern delivery hoses at the same speed as the land speed. Step 9: After the stern hose is retrieved, cover the stern hose and winch drum together with a three-proof cloth to complete the operation.

2. The method for installing a stern transport hose according to claim 1, characterized in that: In step 8, the relationship between the curvature radius R controlled at the inflection point of the stern delivery hose and the radius R0 of the stern delivery hose is as follows: .

3. The method for installing a stern transport hose according to claim 1, characterized in that: In step 8, the method for determining the key parameters of the lifting frame during the retrieval of the stern delivery hose is as follows: in, The total angle at the inflection point. The angle between the lifting point and the starting end of the inflection point. The angle between the lifting point and the end of the inflection point. The length of the suspension rope at the starting end. denoted as , where 'a' is the length of the suspension rope at the end, 'b' is the horizontal distance between the suspension point and the end of the inflection point, and 'a' is the vertical distance between the suspension point and the end of the inflection point. The distance between the lifting point and the center of the inflection point is denoted by ; the values ​​of a and b are known measured values, and the radius of curvature R of the inflection point is determined by the radius R0 of the stern transport hose. If the value is constant, then the variable , , , That should confirm it.

4. The method for installing a stern transport hose according to claim 1, characterized in that: In step 7, the head hose is connected to the emergency release valve on the winch drum.

5. The method for installing a stern transport hose according to claim 1, characterized in that: The installation equipment includes an installation trolley, a lifting frame, a forklift, operating tools, a guide column, and a winch drum. The installation trolley is positioned below the stern delivery hose on the shore of the dock, the lifting frame is positioned above the stern delivery hose and between it and the dock, the forklift is positioned between the stern delivery hose and the dock, and the guide column is positioned at the turning point during the hoisting process of the stern delivery hose.

6. The method for installing a stern transport hose according to claim 5, characterized in that: The stern hose consists of 25 hoses, including one head hose, twenty-three middle hoses, and one tail hose, which are connected in sequence by flanges and fixed with bolts.

7. The method for installing a stern transport hose according to claim 5, characterized in that: The operating tools include a torque wrench, a pressure testing blind flange, a pressure gauge, a pressure testing pump, and a water injection pump.

8. The method for installing a stern transport hose according to claim 5, characterized in that: The hoisting frame is equipped with a dockside crane, flexible hose jacks, and slings.

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