A method of integrated installation of a slip ring internal pipeline

Abstract

The application discloses a kind of integrated installation methods of slip ring internal pipeline, the application proposes to build scaffold tower to carry out the scheme of internal pipeline integration in advance, transfer the work of internal pipeline integration of slip ring to outside, when pipeline integration, the rest related integration work of slip ring can be carried out simultaneously, considering the influence of pipeline weight, flange face levelness when group, sealing ring placement and other factors on the sealing and integrity of flange connection node, it is proposed to use lifting screw to lift the pipeline below to carry out pipeline group in reverse, to protect flange face and sealing ring, avoid damage or knock. In addition, the application completes flange bolt fastening inspection at node, and then hoists to the inside of slip ring as a whole, which can effectively shorten the construction period, reduce the operation risk in limited space, improve the integration efficiency and integration quality of internal pipeline of slip ring.

Description

Technical Field

[0001] The invention relates to the field of slip ring installation in the construction of an inner turret single-point mooring system in marine petroleum engineering, and in particular to a method for integrated installation of pipelines inside a slip ring. Background Art

[0002] Slip rings are the core equipment of the inner turret single-point mooring system. Their integrated installation involves multiple operations, including structural, mechanical, piping, electrical, and instrumentation. This requires installing hundreds or even thousands of pipelines, cables, optical fibers, and brackets within a confined space with a relatively small internal diameter. Slip rings are composed of multiple slip ring units. The greater the number of slip ring units, the more internal piping typically occurs. The denser the piping layout, the greater the difficulty of integrated installation.

[0003] Each section of the slip ring's internal pipeline is connected by flanges, typically using compact flanges and steel Type IX sealing rings. These flange connections require extremely high sealing performance. Because leak detection and repair within the slip ring's internal pipelines are difficult, flange connections must be leak-free throughout their service life. During installation, the flange surfaces and sealing rings must be carefully protected from damage and impact. After assembly, the two flanges must be completely closed, with no gaps between them. Feeler gauges cannot be inserted at any point for inspection. Flange bolt tightening is generally performed according to the following requirements: 30% final torque in a cross-section; 60% final torque in a cross-section; 100% final torque in a cross-section; 100% final torque in a regular sequence; and after 24 hours, a regular sequence at 100% final torque. Flange bolt tightening at the joint is a critical quality control stoppage point. Stringent requirements make the installation complex, labor-intensive, and time-consuming.

[0004] The integration of internal pipelines in the slip ring is located on the critical path of the slip ring construction, which restricts the overall construction period. In addition, the work efficiency in confined spaces is low, the risk is high, and the construction quality is difficult to guarantee.

[0005] The traditional practices and existing problems are as follows:

[0006] (1) When the number of slip ring units and internal pipelines is small, the workload of internal pipeline integration is small, and the pipelines can be directly placed into the slip ring section by section before pipeline integration. However, when the number of slip ring units and internal pipelines is large, the workload and difficulty of pipeline integration increase. The space allowed for personnel construction inside the slip ring is smaller, and it is difficult to tighten the flange bolts using a normal hydraulic torque wrench. The work efficiency is significantly reduced, affecting the overall construction period of the slip ring integration installation. At the same time, since it involves high-altitude operations, special skills and qualifications are required, which increases the construction cost and risk.

[0007] (2) For pipelines connected by ordinary flanges, there are no special requirements for sealing, and it is easier to detect and repair leaks. The process control of tightening the flange connection bolts during construction is not precise enough. If the traditional method is to integrate the internal pipeline outside the equipment, the pipeline sections to be integrated may be placed horizontally on the ground for group integration, and then the entire pipeline is hoisted and placed inside the equipment, or a section of pipeline is first placed upright on the ground, and the pipelines are stacked section by section from bottom to top, and then the flange bolts are tightened at each node in turn. However, the above traditional methods are not suitable for the integration of internal pipelines of slip rings connected by compact flanges, because compact flanges have extremely high requirements for sealing. The traditional method is very easy to bump and damage the flange surface or sealing ring during the pipeline grouping process, and does not consider the stress caused by the weight of the pipeline on the fastening bolts during the overall hoisting and positioning of the pipeline, resulting in the flange node not achieving the best sealing effect, and there is a certain risk of leakage. Therefore, it is impossible to ensure the integrity and sealing of the flange bolts of each node after the pipeline is hoisted and positioned inside the equipment. Summary of the Invention

[0008] The invention discloses a method for integrating and installing pipelines inside a slip ring, which transfers the pipeline integration work inside the slip ring to the outside of the slip ring. When the pipelines are integrated, other related integration work of the slip ring can be carried out simultaneously, thereby shortening the construction period and improving the installation quality.

[0009] In order to solve the above technical problems, the present invention provides a method for integrated installation of pipelines inside a slip ring, which is completed by the following steps and is characterized in that:

[0010] S1. Build a scaffolding tower for integrating the internal pipelines of the slip ring, and place a set of scaffolding towers on each side of the pipeline to be integrated;

[0011] S2. Use a crane to lift the first section of pipeline and place it on a pier near the scaffolding tower. Use rubber pads to isolate and protect the pier from the flange surface below the first section of pipeline. Keep the first section of pipeline vertical with the upper flange surface horizontal.

[0012] S3. Use a crane to lift the second section of pipeline and slowly lower it so that the flange surface at the lower end of this section of pipeline gradually approaches the flange surface of the first section of pipeline. Inspect and clean the flange surface and prepare for pipeline assembly.

[0013] S4. Install four sets of dedicated full-threaded lifting screws on the flange at the lower end of the second pipeline section. The four sets of screws are evenly distributed in the circumferential direction. Place the sealing ring into the groove of the flange at the upper end of the first pipeline section. The screws pass through the bolt holes of the flange at the upper end of the first pipeline section to connect the two pipeline sections. Manually rotate the four sets of screws synchronously to lift the lower first pipeline section. Observe the horizontal state of the flange surface to ensure that the distance between the two flange surfaces is equal during the assembly process.

[0014] S5. After the two flange surfaces are in contact, remove the lifting screws one by one, then install the formal flange connection bolts and tighten them manually. Use a hydraulic torque wrench to tighten the flange bolts according to the required torque value and process until the flange surfaces are closed. Use a feeler gauge to check whether it can be inserted between the two flange surfaces to ensure that the integrity and sealing of the flange connection at the node meet the requirements and pass the inspection;

[0015] S6. Repeat steps S3 to S5 to complete the installation and integration of subsequent multiple pipeline sections. Use a crane to lift the internal pipeline that has been integrated on the scaffolding tower and place it inside the slip ring unit. Then, tighten the flange bolts of the pipeline connection node on the slip ring unit body to complete the integration of the internal pipeline of the slip ring.

[0016] Furthermore, in step S1, a scaffolding tower is assembled from a scaffold and a plurality of tower modules. The erection of the scaffolding tower must take into consideration the position and operation of personnel to facilitate the completion of the pipeline flange bolt connection and tightening work.

[0017] Furthermore, in step S2, a hand chain hoist or a sling may be used to temporarily connect and fix the first section of pipeline to the scaffolding tower.

[0018] The technical effect of the present invention is that: the present invention proposes a scheme for pre-integration of internal pipelines by building a scaffolding tower, transferring the internal pipeline integration work of the slip ring to the outside of the slip ring, and simultaneously carrying out other related integration work of the slip ring during the pipeline integration. Considering the influence of factors such as the weight of the pipeline itself, the horizontality of the flange surface during assembly, and the placement of the sealing ring on the sealing and integrity of the flange connection node, the flange surface and the sealing ring are protected to avoid damage or collision. In addition, the present invention completes the flange bolt tightening inspection at the node and then hoists the entire device into the slip ring, which can effectively shorten the construction period, reduce the operation risk in confined spaces, and improve the integration efficiency and integration quality of the internal pipeline of the slip ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of building a scaffolding tower and placing the first section of pipeline.

[0020] Figure 2 This is a schematic diagram of lowering the second section of pipeline and assembling it with the first section of pipeline.

[0021] Figure 3 This is a schematic diagram of the lifting screw lifting the first section of the pipeline and assembling it with the second section of the internal pipeline.

[0022] Figure 4 This is a schematic diagram of the first and second pipeline sections after the flange connection bolts are tightened.

[0023] Figure 5 It is a schematic diagram of adjacent pipe sections after flange connection.

[0024] Figure 6 This is a schematic diagram of the internal pipeline integrated into the slip ring.

[0025] Figure numerals: 1. Scaffolding tower, 2. Crane, 3. Pad, 4. First section of pipeline, 5. Second section of pipeline, 6. Lifting screw, 7. Flange bolt, 8. Flange, 9. Sealing ring, 10. Slip ring, 11. Pipeline inside the slip ring. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0027] The embodiment of the present invention provides a method for integrated installation of pipelines inside a slip ring. Figure 1-6 As shown, this is accomplished by the following steps:

[0028] S1. Build a scaffolding tower 1 for integrating the internal pipelines of the slip ring 10, and place a group of scaffolding towers 1 on both sides of the pipelines to be integrated.

[0029] In step S1 , a scaffolding tower 1 is assembled from a scaffold and a plurality of tower modules. The erection of the scaffolding tower 1 must take into consideration the position and operation of personnel to facilitate the connection and tightening of the pipeline flange bolts 7 .

[0030] S2. Use crane 2 to lift the first section of pipeline 4 and place it on the pier 3 close to the scaffolding tower 1. Use rubber pads to isolate and protect the pier 3 from the flange surface below the first section of pipeline 4, and keep the first section of pipeline 4 in a vertical state with the upper flange surface horizontal.

[0031] S3. Use crane 2 to lift the second section of pipeline 5, and slowly lower it so that the flange surface at the lower end of this section of pipeline gradually approaches the flange surface of the first section of pipeline 4. Check and clean the flange surface, and prepare to assemble the pipelines.

[0032] In step S2 , a hand chain hoist or a sling may be used to temporarily connect and fix the first section of pipeline 4 to the scaffolding tower 1 .

[0033] S4. Install four sets of dedicated full-thread lifting screws 6 on the flange 8 at the lower end of the second section of pipeline 5. The four sets of screws are evenly distributed in the circumferential direction. Place the sealing ring 9 into the groove of the flange 8 at the upper end of the first section of pipeline 4. The screws pass through the flange bolt holes at the upper end of the first section of pipeline 4 to connect the two sections of pipeline. Manually rotate the four sets of screws synchronously to lift the first section of pipeline 4 at the bottom. Observe the horizontal state of the flange surface to ensure that the distance between the two flange surfaces is equal during the assembly process.

[0034] S5. After the two flange surfaces are in contact, remove the lifting screws 6 one by one, then install the formal flange bolts 7 and tighten them manually. Use a hydraulic torque wrench to tighten the flange bolts 7 according to the required torque value and process until the flange surfaces are closed. Use a feeler gauge to check whether it can be inserted between the two flange surfaces to ensure that the integrity and sealing of the flange 8 connection at the node meet the requirements and pass the inspection.

[0035] S6. Repeat steps S4 to S5 to complete the installation and integration of subsequent multiple pipeline sections. Use crane 2 to hoist the internal pipeline integrated on the scaffolding tower 1, place it inside the slip ring 10 unit, and then tighten the flange bolts 7 of the pipeline connection node on the slip ring 10 unit body to complete the integration of the internal pipeline of the slip ring 10.

[0036] The present invention transfers the integration work of the pipeline 11 inside the slip ring to the outside of the slip ring 10. When the pipeline is integrated, other related integration work of the slip ring 10 can be carried out simultaneously, which greatly improves the work efficiency.

[0037] Taking into account the effects of factors such as the weight of the pipeline itself, the horizontality of the flange surface during assembly, and the placement of the sealing ring 9 on the sealing and integrity of the flange 8 connection node, in order to protect the flange surface and the sealing ring 9 from damage or collision, the present invention proposes a new method of utilizing a lifting screw 6 to lift the lower pipeline and perform pipeline assembly in reverse, thereby ensuring that the integrity and sealing of the flange 8 connection meet the requirements.

[0038] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. A method for integrated installation of pipelines inside a slip ring is completed by the following steps, characterized in that: S1. Build a scaffolding tower for integrating the internal pipelines of the slip ring, and place a set of scaffolding towers on each side of the pipeline to be integrated; S2. Use a crane to lift the first section of pipeline and place it on a pier near the scaffolding tower. Use rubber pads to isolate and protect the pier from the flange surface below the first section of pipeline. Keep the first section of pipeline vertical with the upper flange surface horizontal. S3. Use a crane to lift the second section of pipeline and slowly lower it so that the flange surface at the lower end of this section of pipeline gradually approaches the flange surface of the first section of pipeline. Inspect and clean the flange surface and prepare for pipeline assembly. S4. Install four sets of dedicated full-threaded lifting screws on the flange at the lower end of the second pipeline section. The four sets of screws are evenly distributed in the circumferential direction. Place the sealing ring into the groove of the flange at the upper end of the first pipeline section. The screws pass through the bolt holes of the flange at the upper end of the first pipeline section to connect the two pipeline sections. Manually rotate the four sets of screws synchronously to lift the lower first pipeline section. Observe the horizontal state of the flange surface to ensure that the distance between the two flange surfaces is equal during the assembly process. S5. After the two flange surfaces are in contact, remove the lifting screws one by one, then install the formal flange connection bolts and tighten them manually. Use a hydraulic torque wrench to tighten the flange bolts according to the required torque value and process until the flange surfaces are closed. Use a feeler gauge to check whether it can be inserted between the two flange surfaces to ensure that the integrity and sealing of the flange connection at the node meet the requirements and pass the inspection; S6. Repeat steps S3 to S5 to complete the installation and integration of subsequent multiple pipeline sections. Use a crane to lift the internal pipeline that has been integrated on the scaffolding tower and place it inside the slip ring unit. Then, tighten the flange bolts of the pipeline connection node on the slip ring unit body to complete the integration of the internal pipeline of the slip ring.

2. The method for integrated installation of pipelines inside a slip ring according to claim 1, characterized in that: In step S1, a scaffolding tower is assembled from a scaffold and a plurality of tower modules. The erection of the scaffolding tower must take into account the positioning and operation of personnel to facilitate the completion of the pipeline flange bolt connection and tightening work.

3. The method for integrated installation of pipelines inside a slip ring according to claim 1, characterized in that: In step S2, a hand chain hoist or a sling is used to temporarily connect and fix the first section of pipeline to the scaffolding tower.

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