CN116944774A - Method for installing lower slip ring of inner turret of FPSO - Google Patents
Method for installing lower slip ring of inner turret of FPSO Download PDFInfo
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- CN116944774A CN116944774A CN202310951628.9A CN202310951628A CN116944774A CN 116944774 A CN116944774 A CN 116944774A CN 202310951628 A CN202310951628 A CN 202310951628A CN 116944774 A CN116944774 A CN 116944774A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000003466 welding Methods 0.000 claims abstract description 155
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 69
- 239000010959 steel Substances 0.000 claims abstract description 69
- 238000009434 installation Methods 0.000 claims abstract description 18
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 35
- 230000008093 supporting effect Effects 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000012423 maintenance Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000005299 abrasion Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000012779 reinforcing material Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000003908 quality control method Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 241000209094 Oryza Species 0.000 description 5
- 235000007164 Oryza sativa Nutrition 0.000 description 5
- 235000009566 rice Nutrition 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/047—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
- B66C1/34—Crane hooks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to the field of welding and installing large-scale workpieces, and discloses a method for installing a lower slip ring of a turret in an FPSO (floating production storage and offloading), which is used for preparing work, cleaning a lower bearing ring and an installation area, checking the states of welding equipment and a lifting device, installing a Chinese character 'mi' shaped support frame, and simultaneously confirming that each equipment is firmly installed; the upper part of the lower bearing ring is welded with the upper cylinder; turning the lower bearing ring to the correct position using a lifting device; after the whole structure is overturned, the lower part of the lower bearing ring is welded with the lower cylinder; and after the installation of the lower bearing ring is finished, the steel wire rope is removed, the lifting lug is cut off, and the operation site is cleaned. In order to improve the welding efficiency and reduce the cost, the FPSO lower bearing ring is welded by using an integrally overturning welding method, the upper part of the bearing ring and the cylinder body are welded, the whole overturning is carried out to a proper position for continuous operation, and the lower bearing ring is welded.
Description
Technical Field
The invention relates to the field of welding and installation of large-scale workpieces, in particular to an installation method of a lower slip ring of a turret in an FPSO.
Background
In the use of FPSOs, the lower bearing ring is an important component, supporting the main weight of the FPSO, and also withstanding the impact and vibration of the offshore severe environment, so the welding work of the lower bearing ring is very important. However, the traditional process method of the lower bearing ring is to directly weld with the cylinder body, and because the workpiece body and the weight are large, the direct welding consumes a great deal of manpower and material resources, has high cost and cannot guarantee the installation accuracy.
In a document CN 115676612A, a method for realizing the offshore replacement of a single-point electric slip ring of an inner tower type FPSO is disclosed, wherein the method comprises the steps of lifting and shifting a hatch cover of a single-point cabin of the inner tower type FPSO, lifting, disassembling and repairing an electric slip ring in the hatch cover, and finally reinstalling the hatch cover and the electric slip ring, and comprises the following steps: s1: installing structural members and hoisting equipment for auxiliary hoisting; s2: hoisting and shifting a hatch cover; s3: hoisting, dismounting and shifting the electric slip ring; s4: the electric slip ring is transported to an engineering maintenance point; s5: after the maintenance of the engineering maintenance point is finished, the electric slip ring is transported back to the inner rotating tower type FPSO single-point cabin, the electric slip ring and the hatch cover are reinstalled, and the installation sequence of the hatch cover and the electric slip ring is opposite to the disassembly sequence. When the method is used for replacing, the replacement efficiency is low, the engineering progress is slow, the maintenance cost is high, the abrasion to the steel plate is generated, and the service life is influenced.
Disclosure of Invention
In order to solve the problems, the invention discloses a method for installing a lower slip ring of a turret in an FPSO, which is characterized in that in order to improve welding efficiency and reduce cost, an integrally overturning welding method is used for welding the lower bearing ring of the FPSO, the upper part of the bearing ring and a cylinder body are welded, the whole overturning is carried out to a proper position for continuous operation, and the lower bearing ring is welded.
The technical scheme of the invention is as follows: a method for installing a lower slip ring of a turret in an FPSO comprises the following steps:
step 1: preparing, cleaning a lower bearing ring and an installation area, checking the states of welding equipment and a lifting device, installing a Chinese character 'mi' shaped support frame, and simultaneously confirming that all the equipment is firmly installed;
step 2: the upper part of the lower bearing ring is welded with the upper cylinder;
step 3: turning the lower bearing ring to the correct position using a lifting device;
step 4: after the whole structure is overturned, the lower part of the lower bearing ring is welded with the lower cylinder;
step 5: and after the installation of the lower bearing ring is finished, the steel wire rope is removed, the lifting lug is cut off, and the operation site is cleaned.
The installation method of the lower slip ring of the turret in the FPSO comprises the following installation steps of:
step 1: cleaning the part to be welded, cutting and processing the steel tube in a straight shape, and checking whether the welder and the equipment are normal or not;
step 2: according to a design drawing, placing a straight steel pipe at a preset position, and checking the approximate levelness and verticality;
step 3: placing a straight steel pipe at each 60 DEG, uniformly distributing 6 steel pipes on the central cylinder, and sequentially welding seams between the steel pipe and the central cylinder and between the steel pipe and the steel pipe by adopting a manual arc welding method;
step 4: after welding, finishing the weld joint, including polishing, cutting and polishing to achieve a smooth and even surface effect;
step 5: for residual materials or welding slag generated in the welding process, a wire brush should be used to clean the residual materials or welding slag.
The method for installing the lower slip ring of the turret in the FPSO comprises the following steps of:
step 1: checking and evaluating, firstly, checking and evaluating the lower bearing ring to determine the welding range and process;
step 2: preparing, namely treating a welding area before welding, wherein the welding area comprises cleaning, removing impurities and a surface coating;
step 3: after the welding device is ready, a preset welding program can be used for welding, and the welding mode of the upper cylinder body and the lower bearing ring is girth welding;
step 4: the lower bearing ring needs heat treatment after being welded with the cylinder body, so that the stress is effectively released, and the welding quality is ensured;
step 5: after the welding is finished, the lower bearing ring is required to be subjected to surface coating to prevent corrosion and abrasion, and the lower bearing ring is dried after the coating is finished;
step 6: and finally, carrying out quality control on the lower bearing ring for welding maintenance, testing and evaluating the mechanical property, appearance quality and coating quality of the welding line, and carrying out necessary correction and correction.
The overturning process of the lower bearing ring is as follows:
step 1: before hoisting operation, carrying out self-checking, mutual checking and full-time checking on the lifting lugs, checking and confirming the mounting positions, the number and the specifications of the lifting lugs 101 and the reinforcing materials, and hoisting after the lifting lugs are qualified through the checking;
step 2: the lifting lug is provided with a steel wire rope, the lower bearing ring is stably and slowly conveyed to a height by the crane, and the rest time is kept at least 300 seconds, so that the stress is released, and the lower bearing ring is prevented from deforming;
step 3: the main hook is lifted to a height, the two auxiliary hooks are kept still, the crane runs stably and slowly, and the lower bearing ring is gradually inclined to 90 degrees;
step 4: when the lower bearing ring is inclined to the vertical position, the hook is replaced, the steel wire rope connected with the lifting lug 1 group is replaced to the lifting lug 1 'group position, one end of the steel wire rope connected with the lifting lug 4 group is replaced to the lifting lug 4' group position, and the hook replacement time is required to be completed in a shorter time in the hook replacement stage;
step 5: after the hook is replaced, the main hook descends, the two auxiliary hooks are lifted, the crane still runs stably, the lower bearing ring is gradually turned to 180 degrees, and the crane is required to be stationary for 15 minutes after the turning is completed;
step 6: after turning over, the crane stably places the lower bearing ring at a determined position, the steel wire rope is disassembled, the lifting lug is cut off, when the lifting lug is cut off, the root is required to be left for 10mm, then the air gouging is used for back gouging to 1-2mm, and finally the lower bearing ring is polished. During the lifting lug treatment process, the lower bearing ring parent metal is not allowed to be damaged.
Preferably, the wear-resisting groove has been seted up to lower bearing ring inner wall for install the wear-resisting piece, the guide wood is installed to last week of wear-resisting piece, is equipped with the lug on the lower bearing ring circumference, and the rice word support frame is located the inside of lower bearing ring, and both are the same central point, and the mounting means of rice word support frame is the concentric installation of multilayer, and the mounting point of rice word support frame and lower bearing ring is the position of lug, plays the lug position on supporting role and the location lower bearing ring, prevents that lower bearing ring warp.
Through adopting above-mentioned technical scheme, the wear-resisting piece can protect interior tower surface to avoid the wearing and tearing and the corruption of external environment to extension interior capstan head's life, and improved the performance of lower bearing, reduce frictional force, thereby improve interior capstan head's rotational speed and atress ability, 12 guide woods are equipped with to the higher authority a week of wear-resisting groove, have certain supporting role to the FPSO structure, ensure that the FPSO keeps stable in the installation, prevent the problem such as slope, skew, ensure that the FPSO can not strike down the bearing ring in the installation, simultaneously, the guide woods can improve the FPSO structure, reduce friction and wearing and tearing, prevent the corruption, improve entire system's reliability and security.
Preferably, the rice-shaped supporting frame comprises a central cylinder and linear steel pipes, wherein the linear steel pipes are uniformly spaced in a rice shape and are obliquely arranged by taking the central cylinder as a circle, linear steel pipes b are welded on the linear steel pipes which are obliquely arranged at the same distance from the central cylinder, linear steel pipes c are vertically arranged on the linear steel pipes b, the linear steel pipes b and the linear steel pipes c are in the same plane, and the linear steel pipes c are connected at the positions of the lifting lugs of the lower bearing rings.
Through adopting above-mentioned technical scheme, this kind of structure has stronger steadiness, can prevent effectively that lower bearing ring from warping.
In the step 2 of installing the m-shaped support, the preheating technology is used to control the temperature if necessary, and the distance between each part is kept and the welding at the welding seam of the head part is reinforced during the welding process.
In the step of installing the upper part of the lower bearing ring and the upper cylinder, the length of a welding line in the step 3 is 35-37, FCAW (flux cored arc welding) is adopted for transverse welding, 8 parts are divided, symmetrical jump welding is respectively carried out according to the sequence of 1, 1 ', 2', 3 ', 4 and 4', the welding line with the thickness of 1/3 is finished at the inner side of the circumferential welding line, then carbon planing and back chipping are carried out at the outer side, a grinding wheel is required to be used for grinding the groove in the back chipping process, the lower bearing ring is preheated to at least 150 ℃ in the welding process, the internal temperature is not more than 250 ℃, the welding line used in the welding process is new day iron SF-36EA, and the shielding gas is Ar+20% CO2.
By adopting the technical scheme, the welding accuracy, the repeatability and the welding quality are improved. In addition, this process may also provide a variety of options for welding of different materials.
In the installation step of the upper part of the lower bearing ring and the upper cylinder body, the condition of a reverse overhead welding groove can occur in the welding process of the lower bearing ring in the step 3, a welding line area needs to be thoroughly cleaned before welding, trial welding is carried out in advance, the welding effect is checked, problems are found in time, adjustment is carried out, and the welding quality is ensured.
By adopting the technical scheme, the turnover welding process of the FPSO lower bearing ring can effectively realize high-precision welding of the bearing ring, so that the FPSO lower bearing ring has better quality and stability, and the maintenance efficiency and reliability of FPSO equipment are improved.
The invention has the advantages that: 1. the invention improves the welding efficiency, the lower bearing ring can be quickly turned to a position convenient to operate by using the turning welding process of the lower bearing ring, the welding efficiency is greatly improved, and meanwhile, the repairing and the checking are completed in the shortest time by using the automatic equipment and the real-time monitoring technology, so that the potential problem is found in time.
2. When the bearing ring is welded at the lower part of the FPSO, the welding process and the lower bearing ring turning welding technology are used, so that the welding accuracy, repeatability and welding quality are improved, and in addition, the process can provide various choices for welding different materials.
3. The invention reduces time and cost, shortens construction period, and avoids the time and cost of dragging back to shore by using the lower bearing ring turn-over welding process to weld and maintain on the FPSO because the FPSO is usually used for offshore oil and gas exploitation and requires to drag back to shore for maintenance and repair.
Drawings
FIG. 1 is a diagram of a lower bearing ring welding device of the FPSO of the present invention;
FIG. 2 is a view of the location of the wear blocks in the lower bearing ring of the present invention;
FIG. 3 is a view of the shackle layout in the lower bearing ring of the present invention;
FIG. 4 is a lower bearing ring installation flow chart of the present invention;
FIG. 5 is a schematic illustration of a rice-shaped support frame of the present invention;
FIG. 6 is a girth weld uniformity diagram of the present invention;
fig. 7 is a lifting view of the lower bearing ring of the present invention.
Wherein: 100. the lower bearing ring, 101, lifting lugs, 102, a Mi-shaped supporting frame, 1021, a central cylinder, 1022, straight steel pipes, 1023, straight steel pipes b,1024, straight steel pipes c,103 and a wear-resistant groove; 300. a70 lifting lugs, 301, lower bearing rings, 302 and C40 lifting lugs; 700. a wire rope.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 4, a method for installing a lower slip ring of a turret in an FPSO, wherein the method for installing a lower bearing ring 100 includes the steps of:
step 1: performing preparation work, cleaning the lower bearing ring 100 and the mounting area, checking the states of welding equipment and a lifting device, mounting the m-shaped support frame 102, and simultaneously confirming that the equipment is firmly mounted;
step 2: the upper part of the lower bearing ring 100 is welded with the upper cylinder;
step 3: the lower bearing ring 100 is flipped to the correct position using a crane;
step 4: after the whole structure is turned over, the lower part of the lower bearing ring 100 is welded with the lower cylinder;
step 5: the lower bearing ring 100 is installed, the steel wire rope is removed, the lifting lug is cut off, and the operation site is cleaned.
The installation steps of the rice-shaped support frame 102 are as follows:
step 1: cleaning the part to be welded, cutting and processing the steel tube in a straight shape, and checking whether the welder and the equipment are normal or not;
step 2: according to a design drawing, placing a straight steel pipe at a preset position, and checking the approximate levelness and verticality;
step 3: placing a straight steel pipe at each 60 DEG, uniformly distributing 6 steel pipes on the central cylinder, and sequentially welding seams between the steel pipe and the central cylinder and between the steel pipe and the steel pipe by adopting a manual arc welding method;
step 4: after welding, finishing the weld joint, including polishing, cutting and polishing to achieve a smooth and even surface effect;
step 5: for residual materials or welding slag generated in the welding process, a wire brush should be used to clean the residual materials or welding slag.
The mounting steps of the upper part of the lower bearing ring 100 and the upper cylinder body are as follows:
step 1: inspection and evaluation, first, the lower bearing ring 100 needs to be inspected and evaluated to determine the extent and course of welding;
step 2: preparing, namely treating a welding area before welding, wherein the welding area comprises cleaning, removing impurities and a surface coating;
step 3: after the welding device is ready, a preset welding program can be used for welding, and the welding mode of the upper and lower cylinder bodies and the lower bearing ring 100 is girth welding;
step 4: the lower bearing ring 100 needs heat treatment after being welded with the cylinder body, so that the stress is effectively released, and the welding quality is ensured;
step 5: coating, after welding, the lower bearing ring 100 needs to be surface coated to prevent corrosion and abrasion, and drying is performed after coating is completed;
step 6: and finally, carrying out quality control on the lower bearing ring for welding maintenance, testing and evaluating the mechanical property, appearance quality and coating quality of the welding line, and carrying out necessary correction and correction.
As shown in fig. 7, the lower bearing ring 100 is flipped as follows:
step 1: before hoisting operation, carrying out self-checking, mutual checking and full-time checking on the lifting lug 101, checking and confirming the mounting positions, the number and the specifications of the lifting lug 101 and the reinforcing material, and hoisting after the checking is qualified;
step 2: the lifting lug is provided with a steel wire rope 700, the crane stably and slowly conveys the lower bearing ring 100 to a height and keeps static for at least 300 seconds so as to release stress and prevent the lower bearing ring 100 from deforming;
step 3: the main hook is lifted to a height and keeps the two auxiliary hooks stationary, the crane runs smoothly and slowly, and the lower bearing ring 100 is gradually inclined to 90 degrees;
step 4: when the lower bearing ring 100 is inclined to the vertical position, the hook is replaced, the steel wire rope 700 connected with the lifting lug 1 group is replaced to the lifting lug 1 'group position, one end of the steel wire rope 700 connected with the lifting lug 4 group is replaced to the lifting lug 4' group position, and the hook replacement time is required to be completed in a shorter time in the hook replacement stage;
step 5: after the hook replacement is finished, the main hook descends, the two auxiliary hooks are lifted, the crane still runs stably, the lower bearing ring 100 is gradually turned to 180 degrees, and the crane is required to be stationary for 15 minutes after the turning is finished;
step 6: after turning over, the crane stably places the lower bearing ring at a determined position, the steel wire rope is disassembled, the lifting lug 101 is cut off, when the lifting lug 101 is cut off, the root is required to be left for 10mm, then the air gouging is used for gouging until the root reaches 1-2mm, and finally the lower bearing ring is polished. During the lifting lug treatment process, the lower bearing ring parent metal is not allowed to be damaged.
As shown in fig. 1-3, the inner wall of the lower bearing ring 100 is provided with a wear-resistant groove for installing a wear-resistant block, a guiding wood is installed on the circumference of the wear-resistant block, a lifting lug 101 is arranged on the circumference of the lower bearing ring 100, a rice-shaped supporting frame 102 is positioned in the lower bearing ring 100, the two are the same center point, the mounting mode of the rice-shaped supporting frame 102 is multi-layer concentric mounting, the mounting points of the rice-shaped supporting frame 102 and the lower bearing ring 100 are the positions of the lifting lug 101, the supporting effect is achieved, the position of the lifting lug 101 on the lower bearing ring 100 is positioned, and the lower bearing ring 100 is prevented from deforming.
The abrasion-resistant block can protect the surface of the inner rotating tower from abrasion and corrosion of the external environment, so that the service life of the inner rotating tower is prolonged, the performance of the lower bearing is improved, the friction force is reduced, the rotating speed and the stress capability of the inner rotating tower are improved, 12 guide woods are arranged on the upper surface of the abrasion-resistant groove in a circle, a certain supporting effect is provided for an FPSO structure, the FPSO is ensured to be stable in the installation process, the problems of inclination, deviation and the like are prevented, the FPSO is ensured not to strike the lower bearing ring in the installation process, meanwhile, the guide woods can improve the FPSO structure, reduce friction and abrasion, prevent corrosion and improve the reliability and the safety of the whole system.
The lifting lug 101 of the lower bearing ring 100 is detachable, the lower bearing ring 100 is positioned according to the Mi-shaped supporting frame 102, 4A 70 lifting lugs 300,8C 40 lifting lugs 302 are required to be arranged on the lower bearing ring 100, whether a plate used for the lifting lug 101 has cracks or not is checked before the lifting lug 101 is installed, whether a middle opening has obvious cuts or not is checked, whether a lifting ring is welded according to requirements or not is a welding groove, an alkaline welding rod or a C02 welding wire is adopted, the welding quality is carefully checked, the yield strength of the lifting lug 101 is not less than 235MPa, the welding with equipment is required to be carried out according to a welding process, preheating is required before the welding, corner wrapping treatment is required to be carried out during the welding, and nondestructive flaw detection and heat preservation are required to be carried out on a main welding seam after the welding, so that the cracks are avoided.
In the step 2 of installing the m-shaped support 102, the preheating technology is used to control the temperature if necessary, and in the welding process, the distance between each part should be kept and the welding at the welding seam of the head should be reinforced.
As shown in fig. 5, the rice-shaped supporting frame 102 includes a center cylinder 1021 and linear steel pipes 1022, the linear steel pipes 1022 are obliquely arranged at regular intervals in a rice shape with the center cylinder 1021 being circular, the distance between adjacent linear steel pipes 1022 is 60 °, a linear steel pipe b1023 is welded on the linear steel pipes 1022 which are obliquely arranged at the same distance from the center cylinder 1021, a linear steel pipe c1024 is vertically arranged on the linear steel pipe b1023, the linear steel pipes 1022, the linear steel pipe b1023 and the linear steel pipe c1024 are in the same plane, and the linear steel pipe c1024 is connected at the position of the lifting lug 101 of the lower bearing ring 100.
In the step of installing the upper part of the lower bearing ring 100 and the upper cylinder, in the step 3, the length of the welding line is 35-37m, FCAW (flux cored arc welding) is adopted for transverse welding, the circumferential welding line is divided into 8 equal parts as shown in figure 6, symmetrical jump welding is respectively carried out according to the sequence of 1, 1 ', 2', 3 ', 4 and 4', the welding line with the thickness of 1/3 is finished at the inner side of the circumferential welding line, then carbon planing and back chipping are carried out at the outer side, in the back chipping process, a grinding wheel is required to be used for grinding the groove, in the welding process, the lower bearing ring 100 is preheated to at least 150 ℃, the internal temperature is not more than 250 ℃, the welding line used in the welding process is new day iron SF-36EA, and the shielding gas is Ar+20%CO2, thereby improving the welding accuracy, repeatability and welding quality. In addition, this process may also provide a variety of options for welding of different materials.
In the step of installing the upper part of the lower bearing ring 100 and the upper cylinder, the situation of a reverse overhead welding groove can occur in the welding process of the lower bearing ring 100 in the step 3, a welding line area needs to be thoroughly cleaned before welding, trial welding is performed in advance, the welding effect is checked, problems are found in time and adjustment is performed, the welding quality is ensured, the high-precision welding of the bearing ring can be effectively realized by the turning-over welding process of the lower bearing ring 100 of the FPSO, and the bearing ring has better quality and stability, so that the maintenance efficiency and reliability of the FPSO equipment are improved.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and not limitation, and that the objects of the invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (9)
1. A method of installing a lower slip ring of a turret in an FPSO comprising the steps of:
step 1: preparing, cleaning a lower bearing ring and an installation area, checking the states of welding equipment and a lifting device, installing a Chinese character 'mi' shaped support frame, and simultaneously confirming that all the equipment is firmly installed;
step 2: the upper part of the lower bearing ring is welded with the upper cylinder;
step 3: turning the lower bearing ring to the correct position using a lifting device;
step 4: after the whole structure is overturned, the lower part of the lower bearing ring is welded with the lower cylinder;
step 5: and after the installation of the lower bearing ring is finished, the steel wire rope is removed, the lifting lug is cut off, and the operation site is cleaned.
2. The method for installing the lower slip ring of the turret in the FPSO as claimed in claim 1, wherein the step of installing the m-shaped support frame is as follows:
step 1: cleaning the part to be welded, cutting and processing the steel tube in a straight shape, and checking whether the welder and the equipment are normal or not;
step 2: according to a design drawing, placing a straight steel pipe at a preset position, and checking the approximate levelness and verticality;
step 3: placing a straight steel pipe at each 60 DEG, uniformly distributing 6 steel pipes on the central cylinder, and sequentially welding seams between the steel pipe and the central cylinder and between the steel pipe and the steel pipe by adopting a manual arc welding method;
step 4: after welding, finishing the weld joint, including polishing, cutting and polishing to achieve a smooth and even surface effect;
step 5: for residual materials or welding slag generated in the welding process, a wire brush should be used to clean the residual materials or welding slag.
3. The method for installing a lower slip ring of a turret in an FPSO according to claim 1, wherein the lower bearing ring upper portion and the upper cylinder are installed by:
step 1: checking and evaluating, firstly, checking and evaluating the lower bearing ring to determine the welding range and process;
step 2: preparing, namely treating a welding area before welding, wherein the welding area comprises cleaning, removing impurities and a surface coating;
step 3: after the welding device is ready, a preset welding program can be used for welding, and the welding mode of the upper cylinder body and the lower bearing ring is girth welding;
step 4: the lower bearing ring needs heat treatment after being welded with the cylinder body, so that the stress is effectively released, and the welding quality is ensured;
step 5: after the welding is finished, the lower bearing ring is required to be subjected to surface coating to prevent corrosion and abrasion, and the lower bearing ring is dried after the coating is finished;
step 6: and finally, carrying out quality control on the lower bearing ring for welding maintenance, testing and evaluating the mechanical property, appearance quality and coating quality of the welding line, and carrying out necessary correction and correction.
4. The method for installing a lower slip ring of a turret in an FPSO as claimed in claim 1, wherein the lower bearing ring overturning process is as follows:
step 1: before hoisting operation, carrying out self-checking, mutual checking and full-time checking on the lifting lug, checking and confirming the mounting positions, the number and the specifications of the lifting lug and the reinforcing material, and hoisting after the lifting lug and the reinforcing material pass the checking;
step 2: the lifting lug is provided with a steel wire rope, the lower bearing ring is stably and slowly conveyed to a height by the crane, and the rest time is kept at least 300 seconds, so that the stress is released, and the lower bearing ring is prevented from deforming;
step 3: the main hook is lifted to a height, the two auxiliary hooks are kept still, the crane runs stably and slowly, and the lower bearing ring is gradually inclined to 90 degrees;
step 4: when the lower bearing ring is inclined to the vertical position, the hook is replaced, the steel wire rope connected with the lifting lug 1 group is replaced to the lifting lug 1 'group position, one end of the steel wire rope 700 connected with the lifting lug 4 group is replaced to the lifting lug 4' group position, and the hook replacement time is required to be completed in a shorter time in the hook replacement stage;
step 5: after the hook replacement is finished, the main hook descends, the two auxiliary hooks are lifted, the crane still runs stably, the lower bearing ring 100 is gradually turned to 180 degrees, and the crane is required to be stationary for 15 minutes after the turning is finished;
step 6: after turning over, the crane stably places the lower bearing ring at a determined position, the steel wire rope is disassembled, the lifting lug is cut off, when the lifting lug is cut off, the root is required to be left for 10mm, then the air gouging is used for back gouging to 1-2mm, and finally the lower bearing ring is polished. During the lifting lug treatment process, the lower bearing ring parent metal is not allowed to be damaged.
5. The method for installing the lower slip ring of the turret in the FPSO according to claim 1, wherein the inner wall of the lower bearing ring is provided with a wear-resistant groove for installing a wear-resistant block, a guiding wood is arranged on the periphery of the wear-resistant block, lifting lugs are arranged on the periphery of the lower bearing ring, the rice-shaped supporting frames are positioned in the lower bearing ring, the two are the same center points, the mounting mode of the rice-shaped supporting frames is multilayer concentric mounting, the mounting points of the rice-shaped supporting frames and the lower bearing ring are the positions of the lifting lugs, the supporting function is achieved, the positions of the lifting lugs on the lower bearing ring are positioned, and the lower bearing ring is prevented from being deformed.
6. The method for installing the lower slip ring of the turret in the FPSO according to claim 1, wherein the linear supporting frame comprises a central cylinder and linear steel pipes, the linear steel pipes are uniformly spaced in a linear shape and are obliquely arranged by taking the central cylinder as a circle, the linear steel pipes b which are obliquely arranged are welded at the same distance from the central cylinder, the linear steel pipes b are vertically provided with the linear steel pipes c, the linear steel pipes b and the linear steel pipes c are in the same plane, and the linear steel pipes c are connected at the positions of lifting lugs of the lower bearing ring.
7. The method for installing the lower slip ring of the turret in the FPSO as claimed in claim 2, wherein the temperature is controlled by a preheating technology in the step 2 of installing the m-shaped support, and the distance between each part is kept and the welding at the welding seam of the head part is reinforced during the welding process.
8. The method for installing the lower slip ring of the turret in the FPSO according to claim 3, wherein in the step of installing the upper part of the lower bearing ring and the upper cylinder, the length of a welding line in the step 3 is 35-37, FCAW (flux cored arc welding) is adopted for transverse welding, 8 parts are divided, the symmetrical skip welding is respectively carried out according to the sequence of 1, 1 ', 2', 3 ', 4 and 4', the welding line with the thickness of 1/3 is finished at the inner side of the circular welding line, then carbon planing back chipping is carried out at the outer side, a grinding wheel is needed to grind the groove in the back chipping process, the lower bearing ring is preheated to at least 150 ℃ in the welding process, the internal temperature is not more than 250 ℃, the welding line used in the welding process is new japanese SF-36EA, and the shielding gas is Ar+20% CO2.
9. The method for installing the lower slip ring of the turret in the FPSO according to claim 3, wherein in the step of installing the upper part of the lower bearing ring and the upper cylinder, the condition of reverse overhead welding grooves occurs in the welding process of the lower bearing ring in the step 3, the welding seam area needs to be thoroughly cleaned before welding, trial welding is performed in advance, the welding effect is checked, problems are found in time, and adjustment is performed, so that the welding quality is ensured.
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| CN202310951628.9A CN116944774A (en) | 2023-07-28 | 2023-07-28 | Method for installing lower slip ring of inner turret of FPSO |
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| CN202310951628.9A CN116944774A (en) | 2023-07-28 | 2023-07-28 | Method for installing lower slip ring of inner turret of FPSO |
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