A method and apparatus for cleaning a pipeline in an FPSO topside module

Abstract

The present application relates to the field of FPSO cleaning, and particularly discloses a pipeline equipment cleaning method for upper module of FPSO, which comprises a cleaning tank and a carrier for fixing the pipe fittings, the cleaning tank is circular, a driving shaft is rotatably installed in the middle of the cleaning tank, the carrier is fixed with the driving shaft, the carrier is located around the inside of the cleaning tank, the driving shaft rotates under the driving of a driving source, and drives the carrier and the pipe fittings to swing in the cleaning tank, the inside of the cleaning tank is filled with cleaning liquid, the liquid level of the cleaning liquid is higher than the highest point of the pipe fittings, the opening of the pipe fittings to be cleaned is opposite to the rotation direction of the driving shaft, when the pipe fittings swing circumferentially under the driving of the carrier and the driving shaft, the oil stains on the pipe fittings are cleaned and fall off to float on the liquid level of the cleaning liquid, a circulating assembly is installed on the side wall of the cleaning tank, and the circulating assembly is used for pumping the upper layer of the cleaning liquid, treating the cleaning liquid through a filtering device, and then pumping the cleaning liquid into the cleaning tank again.

Description

Technical Field

[0001] This invention relates to the field of FPSO cleaning technology, and more particularly to a method and procedure for cleaning pipeline equipment in the top module of an FPSO. Background Technology

[0002] Floating Production Storage and Offloading (FPSO) units are integrated facilities used in the oil and gas industry for processing, storing, and offloading subsea oil and gas in nearshore areas. They integrate functions such as oil and gas processing, storage and export, power generation, and wastewater treatment. Used to produce, store, and transfer oil and gas from subsea wells to onshore facilities, the piping system of the FPSO topside module is a critical component in the offshore oil and gas extraction and production process. It requires precise and complex design, installation, and maintenance to ensure the safe and efficient operation of the entire platform. The piping interfaces between the FPSO topside module and the hull mainly include: oil and gas export, heat transfer fluid circulation, wastewater discharge, fire suppression, public gas, instrument gas, chlorine, inert gas, seawater system, and flare system. Due to the unique nature of FPSO top module pipelines, thorough degreasing before delivery is challenging and time-consuming. The duration and efficiency of degreasing directly impact the normal commissioning of the FPSO system. To ensure the degreasing effect meets delivery requirements within the specified timeframe, the cleaning process must be scientifically and comprehensively controlled. The purpose of pre-delivery degreasing of the top module is to ensure equipment and pipeline safety, prepare for product receipt, and lay the groundwork for commissioning. Due to the long process, FPSO top module pipelines inevitably accumulate contaminants such as oil, welding slag, dust, silt, and rust during manufacturing, transportation, storage, and installation. The presence of these contaminants, especially oil, can cause safety hazards and equipment damage during operation after commissioning, and in severe cases, explosions, resulting in significant losses to personnel and equipment. Pre-delivery degreasing effectively removes oil and impurities, creating favorable conditions for the normal operation of the equipment and pipelines after delivery.

[0003] While existing cleaning equipment can clean pipe fittings in pipeline systems, it cannot promptly remove the oil residue. The oil remains in the cleaning solution and continues to clean other pipe fittings, causing secondary pollution. Technicians typically replace the entire cleaning solution to avoid secondary pollution, but this significantly reduces cleaning efficiency, thus necessitating improvement. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] This invention provides a method for cleaning pipeline equipment in the upper module of an FPSO, which solves the problem that existing methods cannot handle the oil stains removed during cleaning. The specific solution is as follows: On one hand, the present invention provides a method for cleaning pipeline equipment in the upper module of an FPSO, including a cleaning tank and a carrier for fixing pipe fittings. The cleaning tank is circular, and a drive shaft is rotatably mounted in the middle of the cleaning tank. The carrier is fixed to the drive shaft and is located around the inside of the cleaning tank. The drive shaft rotates under the drive of a drive source, causing the carrier and pipe fittings to swing inside the cleaning tank. The inside of the cleaning tank is filled with cleaning fluid, and the liquid level of the cleaning fluid is higher than the highest point of the pipe fittings. The opening of the pipe fittings to be cleaned faces the rotation direction of the drive shaft. When the pipe fittings are circumferentially swung by the carrier and the drive shaft, the oil stains on the pipe fittings are cleaned off and float on the surface of the cleaning fluid. A circulation component is installed on the side wall of the cleaning tank. The circulation component is used to extract the upper layer of cleaning fluid, process it through a filter device, and then pump it back into the cleaning tank.

[0006] Preferably, the cleaning tank has a turbulence device in the middle, which is used to guide floating objects in the central area of ​​the cleaning liquid to the periphery of the cleaning liquid. The top of the cleaning tank is fixedly connected to a top frame, the bottom of the drive shaft is rotatably connected to the bottom of the inner wall of the cleaning tank, and the top of the drive shaft is rotatably connected to the middle of the top frame.

[0007] Preferably, the turbulence device includes several blades, which are evenly distributed on the outer wall of the drive shaft, and several blades are higher than the surface of the cleaning liquid. When the drive shaft rotates, the several blades rotate synchronously, thereby generating a downward wind force that blows the surface floating objects in the central area of ​​the cleaning liquid to the surrounding area of ​​the cleaning liquid.

[0008] Preferably, the circulation assembly includes an outlet pipe and an inlet pipe. One end of the outlet pipe is fixed to the outer wall of the cleaning tank, and the other end is connected to the inlet of the filter device. One end of the inlet pipe is connected to the top of the cleaning tank via a circulation pump, and the other end is connected to the outlet of the filter device. At least a portion of the cross-section of the end of the outlet pipe connected to the cleaning tank covers the surface of the cleaning liquid, thereby allowing the circulation pump to pump the uppermost layer of the cleaning liquid containing oil to the filter device.

[0009] Preferably, a liquid level sensor is installed on the inner wall of the cleaning tank, and an industrial control computer is installed on the outside of the cleaning tank. The signals of the liquid level sensor and the circulation component are all connected to the signals of the industrial control computer.

[0010] Preferably, the carrier includes a connecting arm, one end of which is fixedly connected to the drive shaft, and the other end of which has a mounting box. The mounting box has through ports at both ends. The pipe is installed inside the mounting box, and the two ends of the pipe extend to the two ends of the mounting box through the through ports. A base is installed at the bottom of the inner wall of the mounting box, and the shape of the base matches the shape of the lower half of the pipe. A pressure ring is located at the top of the mounting box. The pressure ring presses downward and works together with the base to fix the pipe.

[0011] Preferably, a limiting plate is fixedly connected to one end of the connecting arm near the mounting box, one end of the mounting box is slidably connected to the limiting plate, a limiting post is fixedly connected to the bottom of the mounting box, a limiting groove is opened at the corresponding position of the connecting arm and the limiting post, the limiting post is slidably connected to the limiting groove, and a first spring is sleeved on the outer wall of the limiting post, with the two ends of the first spring fixedly connected to the bottom of the mounting box and the top of the connecting arm, respectively.

[0012] Preferably, the bottom of the mounting box has an arc-shaped protrusion, and the inner wall of the cleaning box has a drive column at the corresponding height of the protrusion. The mounting box is in the lowest position by default. When the protrusion abuts against the drive column, the mounting box rises against the contraction force of the first spring. When the protrusion leaves the drive column, the mounting box falls back to its original height under the action of gravity and the restoring effect of the first spring. Through the up and down movement of the mounting box, the cleaning fluid impacts the inner wall of the pipe, thereby thoroughly cleaning the inner wall of the pipe.

[0013] Preferably, a limiting block is fixed to the side of the limiting plate near the mounting box. A limiting sleeve is fitted on the outer wall of the limiting block. A lower pressure plate is fixed to the bottom of the limiting sleeve. A slider is fixed to the bottom of the lower pressure plate. The bottom of the slider is fixed to the pressure ring via a sliding column. A fixed beam is fixed to the inner wall of the mounting box. The sliding column and slider are slidably connected to the fixed beam. A second spring is fixed between the top of the pressure ring and the bottom of the fixed beam. The compressive force of the second spring causes the pressure ring to press downward. The bottom of the lower pressure plate has an inclined block with a pressing block on it. A sliding sleeve is fixed to the side wall of the mounting box. One end of the pressing block is slidably connected to the side wall of the sliding sleeve. The pressing block is connected to the top of the sliding sleeve via a third spring. The third spring is in a contracted state by default. When the carrier swings with the drive shaft, under centrifugal force, the pressing block overcomes the contraction force of the third spring and swings around the cleaning box, thereby pressing the inclined block, which in turn causes the lower pressure plate to continue pressing downward, allowing the pipe to obtain a stronger clamping force when being swung for cleaning.

[0014] On the other hand, the present invention provides a method for cleaning pipeline equipment in the upper module of an FPSO, comprising the following steps: S1. Securely install the pipe fittings to be cleaned onto the carrier, positioning the pipe fittings around the inside of the cleaning tank, and ensuring that the openings of the pipe fittings face the direction of rotation of the drive shaft. S2. Pour cleaning fluid into the cleaning tank to the set height, so that the liquid level of the cleaning fluid is higher than the highest point of the pipe fitting when it rotates with the carrier. S3. Start the drive source to drive the drive shaft to rotate. The drive shaft drives the carrier and pipes to swing circumferentially in the cleaning fluid. Using centrifugal force and liquid flow flushing, the oil on the pipes is removed and floats to the upper layer of the cleaning fluid. S4. During the rotary cleaning process, the circulation component is activated to extract the cleaning liquid containing floating oil stains from the upper layer of the inner side wall of the cleaning tank and transport it to the filter device for oil removal and impurity filtration. Then, the purified cleaning liquid is pumped back into the cleaning tank to achieve the circulation and purification of the cleaning liquid. The cleaning liquid is also replenished according to the consumption.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. This invention, through the installation of a circulation component and a multi-stage filtration device, extracts and purifies the oily mixture from the upper layer of the liquid surface for reuse. Combined with a flow-dispersing device, it guides the central floating oil to the vicinity of the tank wall, allowing the outlet pipe to accurately extract liquid from high-concentration oily areas. This mechanism avoids the problem of detached oil re-adhering to the pipe surface, as seen in traditional equipment, fundamentally eliminating cross-contamination during the cleaning process and significantly improving the stability of cleaning quality.

[0016] 2. This invention eliminates the waiting time for frequent discharge and addition of cleaning fluid through a dynamic circulation mechanism of "cleaning and filtering at the same time". Combined with the circumferential swing and up-and-down oscillation of the carrier, as well as the centrifugal force self-reinforcing clamping structure, it achieves efficient synergy between physical flushing and chemical cleaning, which greatly shortens the cleaning cycle of a single batch of pipe fittings and meets the timeliness requirements of FPSO upper module maintenance operations.

[0017] 3. The present invention generates a downward wind field by driving the blades to rotate through the drive shaft, forming a specific surface flow field. This forces the light oil stains that have accumulated in the center to be driven to the edge area of ​​the inner wall of the box. This active turbulence guiding design not only solves the problem of slow natural diffusion of oil stains and difficulty in concentrated extraction, but also ensures that the liquid outlet pipe always extracts the surface liquid with the highest oil stain content, which greatly improves the oil removal efficiency of the filtration system.

[0018] 4. This invention utilizes the interaction between the drive column on the inner wall of the cleaning tank and the protrusion at the bottom of the mounting box to generate periodic lifting and lowering motions of the carrier during rotation. This vertical oscillation causes the cleaning fluid to generate strong impact and turbulence inside the pipe, effectively removing stubborn oil and deposits adhering to the pipe wall and weld seams, thus solving the defects of insufficient fluid impact force and easy retention of dead corners when simply rotating horizontally for cleaning.

[0019] 5. This invention utilizes a centrifugal force adaptive clamping mechanism. As the drive shaft speed increases, the clamping force of the pressure ring automatically increases, preventing the pipe fittings from loosening under high-speed swinging. Simultaneously, a cover plate reduces liquid splashing and evaporation, and a side-wall feed inlet facilitates convenient loading and unloading. The overall structural design balances mechanical safety under high-speed operation with ease of on-site operation, reducing worker fatigue and operational risks.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a perspective view of the entire invention without the cover plate; Figure 2 This is a top view of the present invention; Figure 3 This is a perspective view of the entire invention; Figure 4 This is a perspective view of the vehicle of the present invention; Figure 5 This is a perspective view of the vehicle of the present invention from another side; Figure 6 This is a perspective view of the pipe fitting clamping state of the present invention; Figure 7 This is a side view of the vehicle of the present invention; Figure 8 This is a schematic diagram of the feed inlet and sealing block of the present invention; Figure 9 This is an exploded view of the vehicle of the present invention; Figure 10 This is a partial perspective view of the vehicle of the present invention.

[0022] The accompanying figure is labeled as follows: 1. Cleaning tank; 2. Pipe fittings; 3. Carrier; 4. Drive shaft; 5. Circulation assembly; 6. Outlet pipe; 7. Inlet pipe; 8. Circulation pump; 9. Liquid level sensor; 10. Top frame; 11. Blade; 12. Cover plate; 13. Connecting arm; 14. Mounting box; 15. Through port; 16. Base support; 17. Pressure ring; 18. Limiting plate; 19. Limiting post; 20. Limiting groove; 21. First spring; 22. Protrusion; 23. Drive post; 24. Feed inlet; 26. Limiting block; 27. Limiting sleeve; 28. Lower pressure plate; 29. ​​Slider; 30. Sliding column; 31. Fixed beam; 32. Second spring; 33. Inclined block; 34. Extrusion block; 35. Sliding sleeve; 36. Third spring; 37. Sealing block. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0024] Example 1: As Figure 1 As shown, this embodiment provides a method for cleaning pipeline equipment in the upper module of an FPSO, including a cleaning tank 1 and a carrier 3 for fixing pipe fittings 2. The cleaning tank 1 is circular, and a drive shaft 4 is rotatably mounted in the middle of the cleaning tank 1. The carrier 3 is fixed to the drive shaft 4 and is located around the inside of the cleaning tank 1. The drive shaft 4 rotates under the drive of a drive source (the drive source can be a motor), and drives the carrier 3 and pipe fittings 2 to swing inside the cleaning tank 1. The inside of the cleaning tank 1 is filled with cleaning fluid, and the liquid level of the cleaning fluid is higher than the highest point of the pipe fittings 2 when they are being rotated and cleaned. The opening of the pipe fittings 2 to be cleaned is aligned with the rotation direction of the drive shaft 4, so that the cleaning fluid can be poured into the inside of the pipe fittings 2. When the pipe fittings 2 are circumferentially swung under the drive of the carrier 3 and the drive shaft 4, the oil stains on the pipe fittings 2 are cleaned off and float on the surface of the cleaning fluid. A circulation component 5 is installed on the side wall of the cleaning tank 1. The circulation component 5 is used to extract the upper layer of cleaning fluid, process it through a filter device, and then pump it back into the cleaning tank 1.

[0025] It should be noted that the filter elements in the above-mentioned filtration device can be distributed as follows: First stage: Pre-filter (protective stage): Filter elements can be: stainless steel woven mesh, sintered mesh, PP melt-blown coarse filter element, and oil suction filter.

[0026] Second stage: Pre-filtration / coalescing separation (core oil removal stage): The filter element can be either a coalescing filter element or a separating filter element.

[0027] Third stage: Precision filtration (deep purification level): The filter element can be: PP melt-blown filter element, glass fiber filter element, wound filter element, or precision filter (5–10μm).

[0028] Fourth stage: Adsorption / membrane separation: The filter element can be: activated carbon filter element / filter, ultrafiltration (UF) membrane module.

[0029] The filtration sequence is: inlet water → coarse filter cartridge (50–100μm) → coalescing + separation filter cartridge (oil removal) → media filtration → precision filter cartridge (1–10μm) → activated carbon / ultrafiltration → outlet water.

[0030] Those skilled in the art can also select other types of filtration devices according to actual needs, as long as they can treat oil stains.

[0031] The circulation assembly 5 includes an outlet pipe 6 and an inlet pipe 7. One end of the outlet pipe 6 is fixedly connected to the outer wall of the cleaning tank 1, and the other end is connected to the inlet end of the filter device. One end of the inlet pipe 7 is connected to the top of the cleaning tank 1 through the circulation pump 8, so that the filtered cleaning liquid can enter the cleaning tank 1. The other end is connected to the outlet end of the filter device. At least part of the cross section of the end of the outlet pipe 6 connected to the cleaning tank 1 covers the liquid surface of the cleaning liquid, so that the circulation pump 8 can pump the uppermost layer of the cleaning liquid containing oil to the filter device.

[0032] A liquid level sensor 9 is installed on the inner wall of the cleaning tank 1, and an industrial control computer (not shown in the figure) is installed on the outside of the cleaning tank 1. The signals of the liquid level sensor 9 and the circulation pump 8 are both connected to the signals of the industrial control computer. The circulation pump 8 can pump in new cleaning fluid according to the signal of the liquid level sensor 9.

[0033] like Figure 2 As shown, the cleaning tank 1 has a turbulence device in the middle, which is used to guide floating objects in the central area of ​​the cleaning liquid to the surrounding area of ​​the cleaning liquid. The top of the cleaning tank 1 is fixedly connected to the top frame 10, the bottom of the drive shaft 4 is rotatably connected to the bottom of the inner wall of the cleaning tank 1, and the top of the drive shaft 4 is rotatably connected to the middle of the top frame 10.

[0034] The turbulence-inducing device includes several blades 11, which are evenly distributed on the outer wall of the drive shaft 4. Some of the blades 11 are higher than the surface of the cleaning fluid. As the drive shaft 4 rotates, the blades 11 rotate synchronously, generating a downward airflow that blows surface debris from the central area of ​​the cleaning fluid to the surrounding area (e.g.,...). Figure 2 (As shown by the dashed arrow in the image), this allows the liquid outlet pipe 6 to pump out the top layer of cleaning liquid, thus enabling the oil stains in the cleaning liquid to be treated in real time, avoiding secondary pollution to the pipe fitting 2. Compared with existing technologies, the cleaning efficiency is also higher, and there is no need to replace the entire cleaning liquid in the cleaning tank 1.

[0035] As a possible embodiment, or as an alternative to the turbulence device, it can also be implemented without blades 11. Instead, a reciprocating motion device can be used to move the object in the central area of ​​the cleaning liquid, causing water ripples on the liquid surface to spread outwards. This can also spread the oil stains, making it easier for the liquid outlet pipe 6 to collect them.

[0036] like Figure 3 As shown, in order to reduce the evaporation of cleaning fluid and prevent it from splashing, a cover plate 12 is installed on the top of the cleaning tank 1, and the cover plate 12 can be reserved with the required opening, and the cover plate 12 also has a handle for easy handling.

[0037] Example 2: The technical solution of this example differs from that of Example 1 in that, as follows... Figure 4 , Figure 5 , Figure 6 As shown, the carrier 3 includes a connecting arm 13, one end of which is fixedly connected to the drive shaft 4, and the other end of the connecting arm 13 has a mounting box 14. The mounting box 14 has through holes 15 at both ends. The pipe fitting 2 is installed inside the mounting box 14, and the two ends of the pipe fitting 2 extend to the two ends of the mounting box 14 through the through holes 15. A base support 16 is installed at the bottom of the inner wall of the mounting box 14. The shape of the base support 16 matches the shape of the lower half of the pipe fitting 2. A pressure ring 17 is located above the mounting box 14. The pressure ring 17 presses downward and works together with the base support 16 to fix the pipe fitting 2 inside the mounting box 14.

[0038] like Figure 7 As shown, a limiting plate 18 is fixedly connected to one end of the connecting arm 13 near the mounting box 14. One end of the mounting box 14 is slidably connected to the limiting plate. A limiting post 19 is fixedly connected to the bottom of the mounting box 14. A limiting groove 20 is opened at the corresponding position of the connecting arm 13 and the limiting post 19. The limiting post 19 is slidably connected to the limiting groove 20. A first spring 21 is sleeved on the outer wall of the limiting post 19. The two ends of the first spring 21 are fixedly connected to the bottom of the mounting box 14 and the top of the connecting arm 13, respectively.

[0039] like Figure 7 , Figure 8 As shown, the bottom of the mounting box 14 has an arc-shaped protrusion 22. The inner wall of the cleaning box 1 has a drive column 23 at the height corresponding to the protrusion 22. The mounting box 14 is in the lowest position by default. When the protrusion 22 abuts against the drive column 23, the mounting box 14 rises against the contraction force of the first spring 21. When the protrusion 22 leaves the drive column 23, the mounting box 14 falls back to its original height under the action of gravity and the recovery of the first spring 21. Through the up and down movement of the mounting box 14, the cleaning fluid impacts the inner wall of the pipe 2, thereby thoroughly cleaning the inner wall of the pipe 2. Compared with the simple swing cleaning solution, the cleaning efficiency is higher and the cleaning effect is better.

[0040] like Figure 8As shown, the side wall of the cleaning tank 1 is provided with a feed port 24. The feed port 24 is used to allow the pipe fitting 2 to be cleaned to be inserted into the cleaning tank 1. The position of the feed port 24 can be coaxial with the through port 15 on the mounting box 14, so as to facilitate the loading and unloading of the pipe fitting 2. A sealing block 37 is slidably installed inside the feed port 24. The sealing block 37 is fixed to the feed port 24 by bolts and nuts.

[0041] like Figure 9 As shown, a limiting block 26 is fixedly connected to the side of the limiting plate 18 near the mounting box 14. A limiting sleeve 27 is fitted on the outer wall of the limiting block 26. A lower pressure plate 28 is fixedly connected to the bottom of the limiting sleeve 27. A slider 29 is fixedly connected to the bottom of the lower pressure plate 28. The bottom of the slider 29 is fixedly connected to the pressure ring 17 through a sliding column 30. A fixing beam 31 is fixedly connected to the inner wall of the mounting box 14. The sliding column 30 and the slider 29 are slidably connected to the fixing beam. A second spring 32 is fixedly connected between the top of the pressure ring 17 and the bottom of the fixing beam 31. The squeezing force of the second spring 32 causes the pressure ring 17 to be squeezed downward.

[0042] like Figure 10 As shown, the bottom of the lower pressure plate 28 has an inclined block 33, and the inclined block 33 has a pressing block 34. The side wall of the mounting box 14 is fixedly connected to a sliding sleeve 35. One end of the pressing block 34 is slidably connected to the sliding sleeve 35. The pressing block 34 is connected to the top of the sliding sleeve 35 through a third spring 36. The third spring 36 is in a contracted state by default. When the carrier 3 swings with the drive shaft 4, under the centrifugal tendency, the pressing block 34 overcomes the contraction force of the third spring 36 and swings around the cleaning box 1, thereby pressing the inclined block 33, so that the lower pressure plate 28 continues to press downward, so that the pipe 2 obtains a stronger clamping force when it is being swung and cleaned.

[0043] Example 3: This example differs from Example 2 in that it provides a method for cleaning pipeline equipment in the upper module of an FPSO, including the following steps: S1. The operator feeds the pipe fitting 2 to be cleaned into the mounting box 14 through the feed inlet 24. The pipe fitting 2 rests on the base 16. At this time, the pressure ring 17 presses the upper part of the pipe fitting 2 under the action of the second spring 32, achieving initial pre-tightening. Then the cover plate 12 is closed, and cleaning fluid is injected into the cleaning tank 1 until the liquid level is above the highest point of the pipe fitting 2 when it is rotating.

[0044] S2. Start the drive source, and drive shaft 4 begins to rotate at high speed. The carrier 3 fixed on drive shaft 4 drives pipe 2 to swing in a circular motion. Since the opening of pipe 2 faces the direction of rotation, the cleaning fluid is forcefully injected into the interior of pipe 2 under the action of inertia, flushing the inner wall. At the same time, the protrusion 22 at the bottom of the mounting box 14 touches the drive column 23 on the inner wall of the cleaning box 1 as it rotates, forcing the entire mounting box 14 to lift upward along the limiting column 19 against the elastic force of the first spring 21; when the protrusion 22 disengages from the drive column 23, the mounting box 14 falls back under the action of gravity and the first spring 21. This periodic lifting and lowering motion causes the cleaning fluid in pipe 2 to oscillate and impact, further removing stubborn dirt.

[0045] S3. During the high-speed swing of the carrier 3, which generates centrifugal force, the squeezing block 34 overcomes the tension of the third spring 36 and slides away from the axis. Through the cooperation of the inclined block 33 and the lower pressure plate 28, the centrifugal tendency is converted into downward pressure, forcing the pressure ring 17 to further tighten the pipe 2. The higher the rotation speed, the greater the clamping force, ensuring that the pipe 2 will not shift or fall off during violent shaking.

[0046] S4. Simultaneously with the rotation of drive shaft 4, blade 11 rotates. Blade 11, positioned above the liquid surface, generates a downward airflow during rotation, blowing the oil accumulated on the central surface of the cleaning tank 1 towards the surrounding edges. At this time, circulation pump 8 is activated, and outlet pipe 6 extracts the oily mixture from the surface layer. The liquid undergoes multi-stage filtration: first, large particles are intercepted by a coarse filter; then, oil and water are separated by a coalescing filter; next, it undergoes deep purification by a precision filter; and finally, trace amounts of organic matter are adsorbed by activated carbon or an ultrafiltration membrane before being re-injected into the cleaning tank 1 through inlet pipe 7. Liquid level sensor 9 monitors the liquid level in real time; when the liquid level drops, the industrial control computer controls liquid replenishment.

[0047] S5. Through the above cycle, the oil floating on the liquid surface is continuously pumped away and separated, and the cleaning solution is purified and recycled. After cleaning is completed, the drive source is stopped, the cover plate 12 is opened, the carrier 3 is reset, and the cleaned pipe fitting 2 can be taken out through the feed port 24 to prepare for the next round of operation.

[0048] In summary, this invention, by incorporating a circulation component 5 and a multi-stage filtration device, extracts and purifies the oily mixture on the surface of the liquid for reuse in real time. Combined with a turbulence device, it guides the central floating oil to the vicinity of the tank wall, allowing the outlet pipe 6 to accurately extract liquid from the high-concentration oily area. This mechanism avoids the problem of detached oil re-adhering to the surface of the pipe fittings 2, as seen in traditional equipment, fundamentally eliminating cross-contamination during the cleaning process and significantly improving the stability of cleaning quality. Through a dynamic circulation mechanism of "cleaning and filtering simultaneously," it eliminates the waiting time for frequent discharge and refilling of cleaning fluid. Combined with the circumferential swinging and vertical oscillation of the carrier 3, and the centrifugal force self-reinforcing clamping structure, it achieves efficient synergy between physical flushing and chemical cleaning, significantly shortening the cleaning cycle for a single batch of pipe fittings 2 and meeting the timeliness requirements of FPSO upper module maintenance operations. The downward wind field generated by the drive shaft 4 driving the blades 11 to rotate forms a specific surface flow field, which forcibly drives the light oil stains gathered in the center to the edge area of ​​the inner wall of the box. This active turbulence guidance design not only solves the problem of slow natural diffusion of oil stains and difficulty in concentrated extraction, but also ensures that the liquid outlet pipe 6 always extracts the surface liquid with the highest oil stain content, which greatly improves the oil removal efficiency of the filtration system. By cooperating with the drive column 23 on the inner wall of the cleaning box 1 and the protrusion 22 at the bottom of the mounting box 14, the carrier 3 generates periodic lifting and lowering motion during rotation. This vertical oscillation generates strong impact and turbulence of the cleaning fluid inside the pipe fitting 2, effectively removing stubborn oil and deposits adhering to the pipe wall and weld seams. This solves the problems of insufficient fluid impact and the tendency to leave dead zones during simple horizontal rotation cleaning. Through a centrifugal force adaptive clamping mechanism, the clamping force of the pressure ring 17 automatically increases as the drive shaft 4 speed increases, preventing the pipe fitting 2 from loosening under high-speed swing. Simultaneously, the cover plate 12 reduces liquid splashing and evaporation, and the side inlet 24 facilitates convenient loading and unloading. The overall structural design balances mechanical safety under high-speed operation with ease of on-site operation, reducing worker fatigue and operational risks.

[0049] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0052] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cleaning device for pipelines in an FPSO top module, comprising a cleaning tank and a carrier for fixing pipe fittings, characterized in that: The cleaning tank is circular, with a drive shaft rotatably mounted in the center. The carrier is fixed to the drive shaft and is located around the inside of the cleaning tank. The drive shaft rotates under the drive source, causing the carrier and pipes to swing inside the cleaning tank. The cleaning tank is filled with cleaning fluid, and the level of the cleaning fluid is higher than the highest point of the pipes. The opening of the pipe to be cleaned faces the direction of rotation of the drive shaft. When the pipes are swung circumferentially under the drive of the carrier and drive shaft, the oil stains on the pipes are cleaned off and float on the surface of the cleaning fluid. A circulation component is installed on the side wall of the cleaning tank. The circulation component is used to extract the upper layer of cleaning fluid, process it through a filter, and then pump it back into the cleaning tank.

2. The equipment for cleaning pipelines in the top module of an FPSO as described in claim 1, characterized in that: The cleaning tank has a flow-dispersing device in the middle, which is used to guide floating objects in the central area of ​​the cleaning liquid to the periphery of the cleaning liquid. The top of the cleaning tank is fixedly connected to a top frame, the bottom of the drive shaft is rotatably connected to the bottom of the inner wall of the cleaning tank, and the top of the drive shaft is rotatably connected to the middle of the top frame.

3. The equipment for cleaning pipelines in the top module of an FPSO as described in claim 2, characterized in that: The turbulence device includes several blades, which are evenly distributed on the outer wall of the drive shaft. Some of the blades are higher than the surface of the cleaning fluid. As the drive shaft rotates, the blades rotate synchronously, thereby generating a downward wind force that blows the surface floating objects in the central area of ​​the cleaning fluid to the surrounding area of ​​the cleaning fluid.

4. The equipment for cleaning pipelines in the top module of an FPSO as described in claim 1, characterized in that: The circulation assembly includes an outlet pipe and an inlet pipe. One end of the outlet pipe is fixed to the outer wall of the cleaning tank, and the other end is connected to the inlet of the filter device. One end of the inlet pipe is connected to the top of the cleaning tank through a circulation pump, and the other end is connected to the outlet of the filter device.

5. A cleaning device for pipelines in the top module of an FPSO as described in claim 1, characterized in that: A liquid level sensor is installed on the inner wall of the cleaning tank, and an industrial control computer is installed on the outside of the cleaning tank. The signals of the liquid level sensor and the circulation component are all connected to the signals of the industrial control computer.

6. The equipment for cleaning pipelines in the top module of an FPSO as described in claim 1, characterized in that: The carrier includes a connecting arm, one end of which is fixed to the drive shaft, and the other end of which has a mounting box. Both ends of the mounting box have through ports. The pipe is installed inside the mounting box, and both ends of the pipe extend to both ends of the mounting box through the through ports. A base is installed on the bottom of the inner wall of the mounting box, and the shape of the base matches the shape of the lower half of the pipe. A pressure ring is located on the top of the mounting box.

7. A cleaning device for pipelines in the top module of an FPSO as described in claim 6, characterized in that: A limiting plate is fixedly connected to one end of the connecting arm near the mounting box. One end of the mounting box is slidably connected to the limiting plate. A limiting post is fixedly connected to the bottom of the mounting box. A limiting groove is opened at the corresponding position of the connecting arm and the limiting post. The limiting post is slidably connected to the limiting groove. A first spring is sleeved on the outer wall of the limiting post. The two ends of the first spring are fixedly connected to the bottom of the mounting box and the top of the connecting arm, respectively.

8. A device for cleaning pipelines in the top module of an FPSO as described in claim 7, characterized in that: The bottom of the mounting box has an arc-shaped protrusion, and the inner wall of the cleaning box has a drive column at the corresponding height of the protrusion. The mounting box is in the lowest position by default.

9. A cleaning device for pipelines in the top module of an FPSO as described in claim 7, characterized in that: A limiting block is fixed to the side of the limiting plate near the mounting box. A limiting sleeve is fitted on the outer wall of the limiting block. A lower pressure plate is fixed to the bottom of the limiting sleeve. A slider is fixed to the bottom of the lower pressure plate. The bottom of the slider is fixed to the pressure ring via a sliding column. A fixing beam is fixed to the inner wall of the mounting box. The sliding column and slider are slidably connected to the fixing beam. A second spring is fixed between the top of the pressure ring and the bottom of the fixing beam. The compression force of the second spring causes the pressure ring to press downward. The bottom of the lower pressure plate has an inclined block with a pressing block on it. A sliding sleeve is fixed to the side wall of the mounting box. One end of the pressing block is slidably connected to the side wall of the sliding sleeve. The pressing block is connected to the top of the sliding sleeve via a third spring. The third spring is in the retracted state by default.

10. A method for cleaning pipeline equipment in an FPSO top module, employing the method for cleaning pipeline equipment in an FPSO top module as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Securely install the pipe fittings to be cleaned onto the carrier, positioning the pipe fittings around the inside of the cleaning tank, and ensuring that the openings of the pipe fittings face the direction of rotation of the drive shaft. S2. Pour cleaning fluid into the cleaning tank to the set height, so that the liquid level of the cleaning fluid is higher than the highest point of the pipe fitting when it rotates with the carrier. S3. Start the drive source to drive the drive shaft to rotate. The drive shaft drives the carrier and pipes to swing circumferentially in the cleaning fluid. Using centrifugal force and liquid flow flushing, the oil on the pipes is removed and floats to the upper layer of the cleaning fluid. S4. During the rotary cleaning process, the circulation component is activated to extract the cleaning liquid containing floating oil stains from the upper layer of the inner side wall of the cleaning tank and transport it to the filter device for oil removal and impurity filtration. Then, the purified cleaning liquid is pumped back into the cleaning tank to achieve the circulation and purification of the cleaning liquid. The cleaning liquid is also replenished according to the consumption.

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