CN116767427B - Mooring floating installation method for inner rotating tower - Google Patents
Mooring floating installation method for inner rotating tower Download PDFInfo
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Abstract
The invention relates to the technical field of ocean engineering, and discloses an inner rotating tower mooring floating installation method, which comprises the following steps: preparing and detecting before installation; step two: detecting the size and the marks of the inner turret; step three: the lower turret is installed; the toggle plate under the main bearing box body is connected with the jack, and radial force is applied by the jack to position the lower turret; step four: measuring the precision of the lower turret after the installation is finished; step five: installing a turntable; step six: and (3) mounting a tower. According to the invention, the inner turret is installed through six steps, so that the high-precision installation and stable operation of the turret system are ensured, the working efficiency, the reliability and the safety of the inner turret of the FPSO are improved, and the turret system has good performance and stability in long-term operation.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to an inner rotating tower mooring floating installation method.
Background
A floating production storage vessel (Floating ProductionStorage and Offloading System, FPSO for short). The FPSO moorings in a fixed sea area for production operations of hydrocarbons. In world FPSO mooring statistics, turret type single point mooring dominates.
The turret has two types, an inner turret and an outer turret. The inner turret is the most central structure in the whole FPSO system, and its main functions are two: firstly, fixing the whole FPSO in a designated sea area through a mooring system connected with an inner turret, and enabling the bow of the FPSO to always face to the direction of maximum wind and wave flow through the characteristic of a special wind vane, so that the stress of the whole system is minimum; and secondly, connecting oil, water, hydraulic pipelines, electric power and signals on the seabed with an oil-water treatment system and a control system on a ship through a slip ring system in the inner turret, and keeping the pipelines to work normally under a rotating state.
The accuracy of lower turret installation determines the acting point and the acting size of the inner turret of the FPSO in the future, and influences the stress condition of the whole mooring system, so that the accuracy control is required to be accurately controlled in the inner turret installation process.
In the turret assembly device and the turret assembly method disclosed in CN115990761a, four turntables are sequentially arranged on a first turret body from top to bottom, and although the turret assembly is also performed, the turret assembly design is used for a nozzle assembly production line, is not suitable for the installation of a turret in an FPSO, and cannot ensure the installation accuracy of the turret in the FPSO.
For this reason, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an inner turret mooring floating installation method for ensuring the installation precision of the inner turret of the FPSO.
In order to solve the technical problems, the invention provides an inner rotating tower mooring floating installation method which comprises the following steps,
Step one: preparing and detecting before installation;
The coaxiality of a vertical center line A formed by the top diameter of the moon pool cylinder body and the circle centers of the lower bearings in the four reference bearing blocks and the reference center A is not more than phi 5mm; the flatness of the top surface of the turret cylinder body is not more than 0.4mm, and the perpendicularity between the turret cylinder body and the reference center line B is not more than 0.4mm;
Step two: detecting the size and the marks of the inner turret;
the size of the chain plate sliding surface and the size of the winch platform are smaller than the minimum diameter of the moon pool;
step three: the lower turret is installed;
the toggle plate under the main bearing box body is connected with the jack, and radial force is applied by the jack to position the lower turret;
Step four: measuring the precision of the lower turret after the installation is finished;
rotating the lower turret from a fixed position by an angle of 6 degrees, and measuring and recording the center point of the main bearing seat;
Step five: installing a turntable;
Before installation, checking the flatness and the size of the flange surface of the turntable, and ensuring the cleanliness of the main bearing surface and no sundries; then hoisting and installing a turntable on water, and installing bolts between the turntable and the main bearing according to the torque force requirement after the turntable is positioned;
step six: installing a tower;
and positioning and welding the tower after the tower is placed into the base.
Through adopting above-mentioned technical scheme, through preparation and detection before the installation, interior turret size and mark detection, lower turret installation, the precision measurement after the lower turret installation is accomplished, the installation of carousel and the installation of pylon install interior turret, help guaranteeing the installation of turret system high accuracy and stable operation, be favorable to improving in the FPSO the work efficiency of turret, reliability and security, ensure that turret system has good performance and stability in long-term operation.
Preferably, in the first step, the preparation work further comprises installing a guiding tool; the guide tool is a rectangular plate, is made of metal materials and wrapped by wood plates, and is fixed on the wall surface of the moon pool through a locking plate.
By adopting the technical scheme, the guiding tool is made of high-strength metal materials and is formed by wrapping a wood plate. The positioning of the lower turret in a floating state is facilitated through the guide tool, the lower turret is ensured to be aligned correctly and fixed on a target position stably, and the requirement of installation precision is met.
Preferably, in the first step, the preparation further includes inserting a lower bearing groove back pad into the lower bearing groove.
Through adopting above-mentioned technical scheme, lower bearing groove back pad can provide the function of support, protection and dispersion load for the wear-resisting piece. The shock-absorbing and wear-resisting bearing also has shock-absorbing and wear-resisting characteristics, and can reduce vibration, impact and wear to the lower bearing.
Preferably, in the first step, the preparation work further comprises installing a lower bearing plug at the bottom of the clamping groove.
By adopting the technical scheme, the lower bearing chock plays an anti-collision role on the lower bearing in the installation of the lower turret. The clamping groove is a groove on the lower bearing ring and is used for accommodating the wear block, but the wear block is installed after the lower turret is installed. At the moment, the clamping groove is empty, and the abrasion-resistant block is replaced by the plug block, so that the abrasion-resistant block is ensured to be installed smoothly. And at the same time, plays a role in anti-collision.
Preferably, the detecting of the mark in the second step includes marking the mark line and the number corresponding to the lower bearing ring on the chain plate platform.
Through adopting above-mentioned technical scheme, carry out accurate location and control through the sign, can avoid the condition that needs repeated adjustment and reinstallation, save engineering time and improve work efficiency effectively.
Preferably, the precision measurement in the fourth step further comprises measuring the distance between the side surface of the turret chain disc and the lower bearing seat in the low, middle and high positions in the static state of the lower turret; and measuring the gap between the wear-resisting block and the side surface of the turret chain disk, and ensuring that the deviation of the gap and the gap is within the adjustment range of the adjusting support.
By adopting the technical scheme, the precision detection and control installation are carried out, so that the accurate positioning of the lower turret can be ensured, the stability of the system is ensured, the fault risk is reduced, and the subsequent maintenance and overhaul are convenient.
Preferably, in the fourth step, if the deviation of the pitch and the gap is out of range, the process returns to the third step, and the inner turret is adjusted in the X/Y direction.
By adopting the technical scheme, if the deviation exceeds the range, the third step is returned to carry out the readjustment, so that the concentricity of the center of the moon pool cylinder body and the center of the lower turret 1 is ensured, the deviation and the error in the installation process are eliminated, and the balance and the stability of the lower turret and other equipment are ensured.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, the inner turret is installed through six steps of preparation and detection before installation, inner turret size and mark detection, lower turret installation, precision measurement after the lower turret installation is finished, turntable installation and tower installation, so that the high-precision installation and stable operation of a turret system are ensured, the working efficiency, reliability and safety of the inner turret of the FPSO are improved, and the turret system is ensured to have good performance and stability in long-term operation.
2. According to the invention, a rectangular guide tool is made of a metal material and wrapped by a wood plate, and the guide tool is fixed on the wall surface of the moon pool by a locking plate, so that the positioning in a floating state is facilitated, the lower turret is ensured to be aligned correctly and fixed on a target position stably, and the requirement of installation precision is met.
3. In the invention, the spacing between the side surface of the turret chain disk and the lower bearing seat at the low, middle and high positions is measured in the static state of the lower turret; and measuring the gap between the wear-resistant block and the side surface of the turret chain disk, ensuring that the deviation of the gap and the gap is in the adjustment range of the adjusting support, ensuring the accurate positioning of the lower turret, ensuring the stability of the system, reducing the risk of faults and facilitating the subsequent maintenance and overhaul.
Drawings
Fig. 1 is a schematic view of the structure of the inner turret of the present invention.
Fig. 2 is a schematic view of the structure of the lower turret of the present invention after installation.
FIG. 3 is a flow chart of the inner tower installation.
Fig. 4 is a schematic view of the main deck auxiliary datum arrangement of the present invention.
Fig. 5 is a schematic view of the reference point arrangement at the lower bearing position of the present invention.
Fig. 6 is a schematic structural view of the pad of the present invention.
Fig. 7 is a schematic structural diagram of a guiding tool according to the present invention.
Fig. 8 is a schematic structural view of the lower bearing groove back pad of the present invention.
Fig. 9 is a schematic view of the structure of the mounting lower bearing plug of the present invention.
Fig. 10 is a schematic diagram of a reference point setting for tower lifting according to the present invention.
FIG. 11 is a schematic view of a main bearing housing interfacing with the top of a moon pool.
In the figure, 1, a turret, 2, a turntable, 3, a tower, 4, a moon pool wall, 5, a lower bearing, 6, a turret chain disk, 7, a turret main body, 8, a winch platform, 9, a main bearing supporting structure, 10, a main bearing, 11, a top of the moon pool wall, 12, a locating plate, 13, a toggle plate, 14, a bottom of a main bearing box, 15, a backing plate, 16, a guide tool, 17, a lower bearing groove back pad and 18, a lower bearing chock.
Description of the embodiments
The following description of the technical solutions according to the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments.
As shown in fig. 3, the inner tower installation method includes the steps of:
step one: preparation and inspection before installation
Before installation, detection is needed, and whether machining is finished on the top of the moon pool cylinder body according to the precision requirement is finished. The coaxiality of a vertical center line A formed by the diameter (OD phi 12000+/-5 mm) of the top of the cylinder body after machining and the center of a circle of the lower turret bearing 5 at the center of 4 reference bearing blocks (ID phi 11760 +/-1 mm) and the reference center A is not more than phi 5mm; the flatness of the top surface of the turret cylinder body after machining is not more than 0.4mm, and the perpendicularity with the reference center line B is not more than 0.4mm.
As shown in fig. 1, the inner turret comprises a lower turret 1, a turntable 2, and a turret 3. The top of the lower turret 1 is provided with a turntable 2, and the periphery of the turntable 2 is provided with a tower 3. The lower turret 1 is installed into the moon pool. The moon pool corresponds to a round hole dug in the ship. As shown in fig. 2, the turret body 7 is provided with a lower bearing 5, a turret chain plate 6, a winch platform 8, a main bearing support structure 9 and a main bearing 10 to form a complete lower turret 1. The lower turret 1 has a moon pool wall 4, a lower bearing 5, a turret chain disk 6, a turret body 7, a winch platform 8, a Main Bearing Support Structure (MBSS) 9, a main bearing 10, and lower turret attachments. The main bearing 10 and the tower 3 are not connected and the tower 3 is fixed to the vessel. The lower turret 1 is hollow. The winch platform 8, the turret chain plate 6 and the moon pool wall 4 are provided with gaps, and the whole lower turret 1 can rotate. The main function of the lower turret 1 is to support the vertical load and part of the horizontal load of the entire inner turret. The main bearing support structure 9 supports the main bearing 10 and the above parts of the main bearing 10. The main function of the lower bearing 5 is that when horizontal mooring forces are present, the inner turret will contact the lower wear blocks and generate a horizontal load, sharing a part of the horizontal load. The turret chain disk 6 is arranged in the chain disk platform through a lower bearing, the lower bearing 5 is arranged in a lower bearing ring, a clamping groove is formed in the lower bearing ring, and a wear-resisting block is arranged in the clamping groove. The lower bearing ring is arranged on the moon pool wall 4. The force of the lower turret 1 is transmitted to the moon pool through the lower bearing 5.
The dimensions of the moon pool top and the lower bearing ring are measured as required, the final moon pool center line is determined according to the measured data, and the final datum point is fed back to the main deck to facilitate the positioning of the lower turret 1 in the later stage. The center datum point of the moon pool is arranged at the bottom of the dock, and the datum points at the top of the moon pool and the position of the lower bearing 5 are arranged through the center datum point of the moon pool. Fig. 4 is a schematic view of a main deck auxiliary datum arrangement, with the crosses marked as centerline marks and the remaining points marked as center auxiliary datum marks. Fig. 5 is a schematic view of the reference point setting at the position of the lower bearing 5, with 36 targets for precise control in the lower turret installation.
The machining and installation of the backing plate 15 are performed, and the backing plate 15 is structured as shown in fig. 6. The pad 15 is provided with a through hole. The pad 15 plays an important supporting role in the installation of the lower turret of the FPSO, and is installed in a place (main bearing support) where vertical stress is applied, the pad 15 is installed on the surface of the top of the moon pool, which contacts the main bearing box, and the lower turret 1 needs to be removed after being installed. The pad 15 plays a role in anti-collision in the installation of the lower turret 1. A temporary guide fixture 16 is installed. The temporary guiding tool 16 is shown in fig. 7, and is used for guiding the hoisting of the lower turret 1, so that the positioning in a floating state is facilitated, and the preliminary precision control of the hoisting process of the lower turret 1 is also facilitated. The guide tool 16 is a rectangular plate, and is made of high-strength metal materials and is formed by wrapping a wood plate. The guiding tool 16 is fixed on the wall surface of the moon pool by a locking plate. The guide fixture 16 can ensure that the lower turret 1 is properly aligned and stably fixed at the target position to meet the installation requirements and the accuracy requirements. The lower bearing groove back pad 17 is installed, and the structure of the lower bearing groove back pad 17 is shown in fig. 8. In the mounting, the lower bearing groove back pad 17 is inserted into the lower bearing groove. The lower bearing groove back pad 17 can provide support, protection and load dispersion for the wear block. The shock-absorbing and wear-resisting bearing also has shock-absorbing and wear-resisting characteristics, and can reduce vibration, impact and wear to the lower bearing. As shown in fig. 9, a lower bearing block 18 is mounted, which is located at the bottom of the clamping groove and which has an anti-collision effect on the lower bearing during the mounting of the lower turret 1. The clamping groove is a groove on the lower bearing ring and is used for accommodating the wear block, but the installation of the wear block is carried out after the lower turret 1 is installed. At the moment, the clamping groove is empty, and the abrasion-resistant block is replaced by the plug block, so that the abrasion-resistant block is ensured to be installed smoothly. And at the same time, plays a role in anti-collision.
Step two: inner turret size and mark detection
In the process of moving the ship body around the inner turret, the inner turret and the moon pool wall 4 are required to ensure concentricity. The stability of stress and movement is achieved, the service life of the part is prolonged, therefore, the precision of the machined surface is detected before the installation, and when the requirement is met, the inner rotating tower is installed. In order to facilitate installation and to ensure proper operation of the inner turret, the dimensions of the sides of the turret chain disk 6 and the dimensions of the winch platform 8 are required to be smaller than the minimum diameter of the moon pool, so that the installation of the wear blocks is facilitated, the distance between the wear blocks and the sides of the turret chain disk 6 is not smaller than 2mm, and the detection and adjustment are required after the installation. After the FPSO hull is launched, the seawater submerges the lower bearing 5 as a lubricant for the lower bearing 5.
(1) Size detection: detecting the size of the main bearing box; the size of the chain plate surface; the size of the winch platform. The size of the chain wheel sliding surface and the size of the winch platform should be smaller than the minimum diameter of the moon pool. The main bearing 10 is mounted within and protrudes from the main bearing housing, which provides stable support and protects the main bearing from the external environment.
In a turret system inside a FPSO (floating production storage vessel), the main bearing 10 is a key component for supporting the turntable. The main bearing is mounted on top of the lower turret 1, at the bottom of the turntable.
(2) And (3) marking detection: the main bearing 10 is provided with marks corresponding to standard points on the main deck. The chain disk platform is marked with marking lines and numbers corresponding to the lower bearing rings. The turret chain plate 6 is mounted on the chain plate platform. In which lower bearing ring a lower bearing 5 is mounted. The turret chain disk 6 is installed in the lower part of the chain disk platform.
The installation efficiency can be improved through the location, reduces assembly time. The accurate positioning and control are performed through the marks, the condition that repeated adjustment and reinstallation are needed can be avoided, the construction time is effectively saved, and the working efficiency is improved.
Step three: lower turret mounting
The lower turret 1 is provided with an air pipe, a pipeline, a straight ladder, a lamp and the like. Wherein the vertical load mainly comprises: the dead weight of the whole inner tower system body, the inertia force caused by vertical acceleration and the vertical load of the mooring cable and the vertical pipe. The horizontal load mainly includes: various horizontal loads caused by ship motion. The lower turret ensures that the vessel is in a horizontal state before hoisting. The lower turret is installed in a water lifting manner, and the lower turret 1 is slowly placed into a moon pool. Positioned in the top and bottom X/Y (front-back-left-right) directions of the lower turret 1. By providing the reflective sheets at the top and bottom of the lower turret 1 in advance, the center positions of the top and bottom of the lower turret 1 are controlled. On the outer surface of the lower turret 1,2 rows of precisely controlled targets are posted before turret inspection, at appropriate distances (2-4 m) from top to bottom along the center line of the turret body, corresponding to the longitudinal and transverse directions of the ship. The total station sighting target is used for detecting whether the lower turret 1 tower body floating and lifting process is in a vertical position or not. As shown in fig. 10, a schematic diagram is provided for the reference point for the lower turret 1 hoisting, and targets are attached at the positions (1) to (6).
When the lower turret 1 is lifted close to the right position, the X/Y direction deviation is controlled to be within the adjustment range of the adjustable support until the lower turret 1 is within the adjustment range. Fig. 11 is a schematic view showing the bottom 14 of the main bearing housing abutting the top 11 of the moon pool wall 4. The bottom 14 of the main bearing housing may then sit on top 11. Gradually removing the force of the rope of the crane, and finally enabling the ship to be still in a horizontal state. According to the reserved basic points, the lower turret 1 is positioned by means of toggle plates 13 (12 distributed along the circumference of the moon pool wall 4) and jacks under the main bearing housing. The toggle 13 is connected to the jack. The jack is placed around the horizontal circumference of the moon pool wall, and radial force in the horizontal direction is applied to adjust the X/Y direction position of the lower turret, so that concentricity of the center of the moon pool cylinder body and the center of the lower turret 1 is ensured, and finally the positioning of the lower turret 1 can meet the requirement. After which the crane rope is removed.
The position of the lower turret 1 is fixed using the installation positioning plate 12. After positioning and fixing the position, the bottom 14 of the main bearing box body and the top 11 of the moon pool are welded, welding quality and deformation caused by welding are monitored in the welding process, and meanwhile, the welding sequence is required to be adjusted at any time according to a change value in the welding process. And after the abrasion-resistant block is machined, the abrasion-resistant block and the locking plate are installed. And in a static state, measuring the gap between the wear-resisting block and the side surface of the turret chain disk 6, and ensuring that the gap is not less than 2mm. And installing relevant accessories such as air pipes, pipelines, straight ladders, lamps and the like.
By means of precision detection and control of the mounting process, accurate positioning of the lower turret in the correct position can be ensured. This is critical for the proper functioning of the whole turret system, in particular in connection and working cooperation with other equipment. The precision detection and control installation can help eliminate deviation and error in the installation process, and ensure balance and stability of the lower turret and other equipment. This helps to reduce vibrations and oscillations inside the system, improving the stability and reliability of the system.
Step four: precision measurement after completion of lower turret installation
After the welding is finished, rotating the lower turret 1 from a fixed position at an angle of 6 degrees, and then measuring and recording the center point of the main bearing seat; the main bearing housing has a main bearing 10 mounted therein. Rotating the lower turret 1 from a fixed position at an angle of 6 ° to measure and record the center of the lower turret 1 to determine the runout of the lower turret 1; the runout is shaft runout, and the condition of instability or unbalance of the rotating device during operation is measured, so that stable operation of the turret is ensured. In the static state of the lower turret 1, measuring the distance between the side surface of the turret chain disk 6 and the lower bearing seat at the low, middle and high positions; in a stationary state, the gap between the wear block and the side of the turret chain disk 6 is measured. The deviation is not allowed to exceed the adjustment range of the adjusting support, and the more accurate the position is, the more advantageous.
If the deviation of the distance and the gap exceeds the range, the third step is returned to adjust the inner turret in the X/Y direction, so that the concentricity of the center of the moon pool cylinder body and the center of the lower turret 1 is ensured, the deviation and the error in the installation process are eliminated, and the balance and the stability of the lower turret and other equipment are ensured.
The accuracy detection and control installation can ensure the accurate positioning of the lower turret and the stability of the system, reduce the fault risk, be favorable for safe operation and facilitate the subsequent maintenance and overhaul.
Step five: mounting of turntables
Before installation, the flatness and the size of the flange surface of the turntable 2 need to be checked to ensure the cleanliness of the surface of the main bearing 10 and no sundries. And then hoisting and installing the turntable 2 on water, slowly placing the turntable 2 on the lower turret 1, and ensuring that the direction of the turntable 2 corresponds to the direction of the lower turret 1. After positioning, the bolts between the turntable 2 and the main bearing 10 are installed according to the torque requirements. The main bearing 10 is fitted on the inner circumference of the turntable 2. Mounting tubes, ladders, lights and other accessories. The lower turret 1 and the turntable 2 were rotated clockwise and counterclockwise in 30 degree increments, and the torque of the rotation was recorded. By checking the flatness and size of the flange face of the turntable 2, the mounting quality of the turntable 2 can be ensured. If the flange faces are uneven or of an unsatisfactory size, this may lead to problems with unstable assembly or unbalanced rotation.
Step six: tower installation
When the base of the tower on the main deck is ready, the positioning accuracy meets the requirement. And then hoisting and installing the tower 3 on water, positioning and welding the tower 3 after the tower 3 is put on a base according to a hoisting program of the tower 3. After which the loose supply pipes, ladders, lights and other accessories on the tower 3 are installed. The base is welded to the deck in advance for supporting the tower 3. The inner space of the tower 3 accommodates the turntable 2.
According to the application, the inner turret is installed through the front and rear steps, so that the high-precision installation and stable operation of the turret system are ensured, the working efficiency, reliability and safety of the turret in the FPSO can be improved, and the turret system is ensured to have good performance and stability in long-term operation.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The mooring floating installation method for the inner rotating tower is characterized by comprising the following steps of:
The inner rotating tower comprises a lower rotating tower, a rotating disc, a tower, a rotating disc mounted on the top of the lower rotating tower, a tower mounted on the periphery of the rotating disc, a lower rotating tower mounted in a moon pool, a moon pool wall, a lower bearing, a rotating tower chain disc, a rotating tower main body, a winch platform, a main bearing supporting structure, a main bearing and a lower rotating tower accessory, wherein the main bearing is not connected with the tower, the tower is fixed with a ship, the lower rotating tower is hollow, the winch platform, the rotating tower chain disc and the moon pool wall are provided with gaps, the whole lower rotating tower can rotate, the rotating tower chain disc is mounted in the chain disc platform through the lower bearing, the lower bearing is mounted in a lower bearing ring, a clamping groove is formed in the lower bearing ring, a wear-resisting block is mounted in the clamping groove, and the lower bearing ring is mounted on the moon pool wall and transmits the force of the lower rotating tower to the moon pool through the lower bearing;
The method for mooring and floating installation of the inner rotating tower comprises the following steps:
step one: preparing and detecting before installation;
The coaxiality of a vertical center line A formed by the top diameter of the moon pool cylinder body and the circle centers of the lower bearings in the four reference bearing blocks and the reference center A is not more than phi 5mm; the flatness of the top surface of the turret cylinder body is not more than 0.4mm, and the perpendicularity between the turret cylinder body and the reference center line B is not more than 0.4mm;
Machining and installing a backing plate, wherein through holes are formed in the backing plate, the backing plate is installed on the surface of the top of the moon pool, which is in contact with the main bearing box, and the lower turret is required to be removed after being installed;
installing a temporary guiding tool, wherein the temporary guiding tool is used for guiding the lower turret to hoist, the guiding tool is a rectangular plate, is made of metal materials and is wrapped by a wood plate, and the guiding tool is fixed on the wall surface of the moon pool by a locking plate;
the lower bearing groove back pad is installed, and when the lower bearing groove back pad is installed, the lower bearing groove back pad is inserted into the lower bearing groove, so that the lower bearing groove back pad can provide functions of supporting, protecting and dispersing loads for the wear-resisting block;
the lower bearing chock is arranged, the chock is positioned at the bottom of the clamping groove, the lower bearing is crashproof in the installation of the lower turret, the clamping groove is a groove on the lower bearing ring and is used for accommodating the wear-resisting block, but the clamping groove is empty at the moment, the wear-resisting block is replaced by the chock, the smooth installation of the wear-resisting block is ensured, and the crashproof effect is achieved;
Step two: detecting the size and the marks of the inner turret;
Size detection: detecting the size of a main bearing box, the size of a chain disc surface and the size of a winch platform; the size of the chain plate sliding surface and the size of the winch platform are smaller than the minimum diameter of the moon pool;
And (3) marking detection: the main bearing is provided with marks corresponding to standard points on the main deck, mark lines and numbers corresponding to the lower bearing rings are marked on the chain disk platform, a turret chain disk is arranged on the chain disk platform, a lower bearing is arranged in the lower bearing ring, and the turret chain disk is arranged in the lower part of the chain disk platform;
step three: the lower turret is installed;
Before hoisting, the lower turret ensures that the ship is in a horizontal state, the lower turret is hoisted and installed on water, the lower turret is slowly placed into a moon pool, the top and the bottom of the lower turret are positioned in the X/Y direction, and the center positions of the top and the bottom of the lower turret are controlled by arranging reflecting sheets at the top and the bottom of the lower turret in advance; on the outer surface of the lower turret, corresponding to the longitudinal and transverse directions of the ship, along the central line of the tower body from top to bottom, at intervals of 2-4m, pasting two rows of targets with control precision before turret inspection, and aiming the targets by the total station, wherein the targets are used for detecting whether the floating and lifting process of the lower turret body is in a vertical position or not;
When the lower turret is lifted close to in place, controlling the X/Y direction deviation to be in an adjustable supporting adjustment range until the lower turret is in the adjustable range, then enabling the bottom of a main bearing box body to be located at the top, gradually unloading the force of a rope of a crane, finally enabling a ship to be still in a horizontal state, positioning the lower turret by means of a toggle plate and a jack under the main bearing box body according to a reserved basic point, connecting the toggle plate with the jack, enabling the jack to be placed around the horizontal circumference of a moon pool wall, applying radial force in the horizontal direction to adjust the X/Y direction position of the lower turret, ensuring concentricity of the center of a moon pool cylinder body and the center of the lower turret, ensuring that the positioning of the lower turret finally meets the requirement, and then unloading the rope of the crane;
The method comprises the steps of fixing the position of a lower turret by using a mounting locating plate, welding the bottom of a main bearing box body and the top of a moon pool after locating and fixing the position, monitoring welding quality and deformation caused by welding in the welding process, adjusting the welding sequence at any time according to a change value in the welding process, mounting a wear-resisting block and a locking plate after the wear-resisting block is machined, and measuring a gap between the wear-resisting block and the side surface of a turret chain disk in a static state to ensure that the gap is not less than 2mm;
Step four: measuring the precision of the lower turret after the installation is finished;
Rotating the lower turret from a fixed position at an angle of 6 degrees, and measuring and recording the center of the lower turret to determine the jumping amount of the lower turret; measuring the spacing between the side surface of the turret chain disk and the lower bearing seat at the low, middle and high positions in the static state of the lower turret; in a static state, measuring the gap between the wear-resisting block and the side surface of the turret chain disk, wherein the deviation is not allowed to exceed the adjustment range of the adjusting support; if the deviation of the distance and the gap exceeds the range, returning to the third step, and adjusting the X/Y direction of the inner turret;
Step five: installing a turntable;
Before installation, checking the flatness and the size of the flange surface of the turntable, and ensuring the cleanliness of the main bearing surface and no sundries; then hoisting and installing the turntable on water, slowly placing the turntable on the lower turret, and ensuring that the direction of the turntable corresponds to the direction of the lower turret; after the turntable is positioned, installing bolts between the turntable and the main bearing according to the torque requirement; rotating the lower turret and the turntable clockwise and anticlockwise by taking 30 degrees as an increment, recording the rotating torque, and ensuring the installation quality of the turntable by checking the flatness and the size of the flange surface of the turntable;
step six: installing a tower;
According to the hoisting procedure of the tower, the tower is positioned and welded after being placed on a base, then scattered supply pipes, ladders, lamps and other accessories on the tower are installed, the base is welded on a deck in advance and used for supporting the tower, and the inner space of the tower contains a turntable.
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| US4701143A (en) * | 1984-10-17 | 1987-10-20 | Key Ocean Services, Inc. | Vessel mooring system and method for its installation |
| CN203497133U (en) * | 2013-09-11 | 2014-03-26 | 中国海洋石油总公司 | Single-point mooring apparatus of novel inner turret |
| KR20150118593A (en) * | 2014-04-14 | 2015-10-23 | 삼성중공업 주식회사 | Turret unit and turret installation method |
| CN106232468A (en) * | 2014-04-14 | 2016-12-14 | 瑞士单浮筒系泊公司 | There is the outer capstan head of steering framing wheel |
| CN107933843A (en) * | 2017-11-27 | 2018-04-20 | 武汉理工大学 | FDPSO based on separable inner cupola formula anchoring system |
| CN111084140A (en) * | 2019-12-25 | 2020-05-01 | 海阳中集来福士海洋工程有限公司 | Single point mooring turret cylinder and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6854407B2 (en) * | 2002-01-25 | 2005-02-15 | Fmc Technologies, Inc. | Method for constructing a very large turret mooring arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4701143A (en) * | 1984-10-17 | 1987-10-20 | Key Ocean Services, Inc. | Vessel mooring system and method for its installation |
| CN203497133U (en) * | 2013-09-11 | 2014-03-26 | 中国海洋石油总公司 | Single-point mooring apparatus of novel inner turret |
| KR20150118593A (en) * | 2014-04-14 | 2015-10-23 | 삼성중공업 주식회사 | Turret unit and turret installation method |
| CN106232468A (en) * | 2014-04-14 | 2016-12-14 | 瑞士单浮筒系泊公司 | There is the outer capstan head of steering framing wheel |
| CN107933843A (en) * | 2017-11-27 | 2018-04-20 | 武汉理工大学 | FDPSO based on separable inner cupola formula anchoring system |
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