CN114030563B - Multi-point mooring system suitable for cylindrical FPSO and design method thereof - Google Patents
Multi-point mooring system suitable for cylindrical FPSO and design method thereof Download PDFInfo
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- CN114030563B CN114030563B CN202111515488.8A CN202111515488A CN114030563B CN 114030563 B CN114030563 B CN 114030563B CN 202111515488 A CN202111515488 A CN 202111515488A CN 114030563 B CN114030563 B CN 114030563B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000013461 design Methods 0.000 title claims abstract description 16
- 229920000728 polyester Polymers 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000007667 floating Methods 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 238000010205 computational analysis Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000007774 longterm Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 230000007613 environmental effect Effects 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000000545 stagnation point adsorption reflectometry Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B71/00—Designing vessels; Predicting their performance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B2021/203—Mooring cables or ropes, hawsers, or the like; Adaptations thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
- B63B2021/505—Methods for installation or mooring of floating offshore platforms on site
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- Chemical & Material Sciences (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
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Abstract
The invention relates to a multipoint mooring system suitable for a cylindrical FPSO and a design method thereof, comprising the following steps: each mooring cable comprises a plurality of mooring cables, each mooring cable comprises an upper anchor chain, a lower anchor chain, an upper polyester cable, a lower polyester cable and a buoy, the upper end of the upper anchor chain is connected with a cable guiding hole of a floating production platform through a platform chain, the lower end of the upper anchor chain is connected with the upper end of the upper polyester cable through a mounting chain, the two ends of the buoy are respectively connected with the lower end of the upper polyester cable and the upper end of the lower polyester cable, the lower end of the lower polyester cable is connected with the upper end of the lower anchor chain through a mounting chain, and the lower end of the lower anchor chain is connected to a mud inlet point, so that a multipoint mooring system is formed. The system improves the operation safety of the platform, effectively saves the construction and purchasing costs, provides a solution for a novel cylindrical FPSO mooring system suitable for middle and shallow water depths in the south China sea area, and is beneficial to long-term investment of deep sea oil and gas exploration and development.
Description
Technical Field
The invention relates to a multipoint mooring system suitable for a cylindrical FPSO and a design method thereof, belonging to the technical field of offshore oil development.
Background
Because the reserves of the offshore oil gas in China are very abundant, the main battlefield of the oil gas development and exploration in China is developed from inland to shallow sea at present. In order to extract oil and gas in deep sea, it is generally necessary to construct an oil and gas production platform integrating deep sea drilling, oil and gas treatment, oil storage, oil discharge, power generation, heat supply, life and other functions on the deep sea water surface, and then to convey oil and natural gas to an oil storage tank or a gas storage tank on a tanker or on land through pipelines. The oil and gas production platform is generally suspended on the deep sea surface, and in order to drill well from the deep sea and transport the drilled oil and gas out, the main current development schemes of the deep sea oil and gas field mainly comprise a semi-submersible platform with a stand column supporting structure, a floating production oil storage and offloading device (Floating Production Storage and Offloading, FPSO), a SPAR and a tension leg platform, and the production platforms have different economic and technical applicability for different sea conditions and different stages of oil field development.
Conventional mooring systems mainly include mooring systems in the form of a chain-cable structure and mooring systems having polyester cables as a main component. Mooring systems in the form of a chain-cable construction are relatively expensive to manufacture, especially under extreme environmental loads, which can lead to substantial increases in the cost of the mooring system. Mooring systems based on polyester cables are more suitable for sea areas with greater environmental loads than those based on polyester cables.
The special sea condition and topography of south China sea oil field, the mooring system of the cylindrical FPSO has the characteristics of high requirement on the mooring system of the south China sea, high flow rate of the south China sea and typhoon frequently, the cylindrical FPSO has no wind vane effect, all environmental loads are very large, the FPSO can generate larger deflection, larger mooring tension is generated, the water depth of the south China sea oil field is concentrated to 100m-500m, and the design challenge of the mooring system of the floating body under the large load under the middle and shallow water depth is very large. At the same time, in order to solve the problem that the polyester cable cannot bottom out, a member of a mooring buoy needs to be added in a mooring configuration, and the design challenge of a mooring system is further increased.
Disclosure of Invention
Aiming at the technical problems, the invention provides a multipoint mooring system suitable for a cylindrical FPSO and a design method thereof, which are used for solving the practical engineering problems that a floating production platform mooring system with a larger mooring radius is required to be suitable for, tension is larger than standard requirements, and a polyester cable touches the bottom under the middle and shallow water depths.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A multi-point mooring system suitable for a cylindrical FPSO, comprising:
Each group of mooring ropes comprises a plurality of mooring ropes, each mooring rope comprises an upper anchor chain, a lower anchor chain, an upper polyester rope, a lower polyester rope and a buoy, the upper end of the upper anchor chain is connected with a guide rope hole of a floating production platform through a platform chain, the lower end of the upper anchor chain is connected with the upper end of the upper polyester rope through a mounting chain, the two ends of the buoy are respectively connected with the lower end of the upper polyester rope and the upper end of the lower polyester rope, the lower end of the lower polyester rope is connected with the upper end of the lower anchor chain through a mounting chain, and the lower end of the lower anchor chain is connected to a mud inlet point, so that the multipoint mooring system is formed.
The direction of the mooring lines of the multipoint mooring system is preferably determined according to wind and wave loads, submarine pipeline routing, riser deflection requirements and upper module arrangement.
In the multipoint mooring system, preferably, when the multipoint mooring system is a tension mooring system, the mooring lines are three groups, and the number of the mooring lines in each group is at least 3.
In the multipoint mooring system, preferably, an included angle between each group of mooring ropes is 120 degrees, and an included angle between every two adjacent mooring ropes between groups is 2 degrees.
Based on the multipoint mooring system, the invention also provides a design method of the system, which comprises the following steps:
preliminarily determining the number and the direction of the mooring ropes;
Determining the radius, composition and properties of the mooring line and segments;
And carrying out mooring performance analysis, and confirming the attribute of each section in the mooring rope.
The design method, preferably, primarily determines the number and orientation of the mooring lines, and comprises the following steps:
For a cylindrical FPSO, the tensioning mooring system adopts three groups of mooring lines, wherein the number of each group of mooring lines is at least 3, and the number of the mooring lines is determined according to analysis; the included angle between every two adjacent mooring ropes is 120 degrees, and the included angle between every two adjacent mooring ropes is 2 degrees;
And (5) collecting marine environment conditions, and determining the direction of the mooring lines according to wind and wave loads, submarine pipeline routing, riser deflection requirements and upper module arrangement.
The design method, preferably, determines the radius, composition and properties of each segment of the mooring line, comprising the steps of:
collecting ocean geological data and determining the position of an anchor point;
the mooring line comprises the following components: an upper anchor chain, a lower anchor chain, an upper polyester cable, a lower polyester cable, a pontoon and a mounting chain;
determining the length of each segment in the mooring line;
Past project data is collected and attributes of segments of the mooring line are initially determined.
The design method, preferably, performs mooring performance analysis to confirm the properties of each segment in the mooring rope, and includes the following steps:
performing frequency domain-time domain computational analysis on the preliminarily selected mooring system by utilizing potential flow business software;
evaluating the frequency domain-time domain calculation analysis result;
Performing a reduced scale model experiment on the mooring rope, and paying attention to whether the tension of the mooring rope is matched with a numerical simulation result;
when the above requirements are met, it is reasonable to state that the choice of the multipoint mooring system is reasonable.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. The cylindrical FPSO has the advantages of simple structure, high oil storage efficiency compared with the ship-type FPSO under unit steel amount, low construction cost, no single-point device, no post maintenance cost of a turret structure, no wind direction requirement, insensitivity to the environmental load direction, higher deck bearing capacity, small fatigue load caused by waves and the like, and is very suitable for secondary development of isolated oil fields and marginal oil fields which have reached the middle and later stages of development.
2. The design method of the cylindrical FPSO mooring system can quickly determine the design scheme of the mooring system by combining the domestic marine environment and the geological condition when corresponding to the specific oil-gas field in China, provides a solution for the risk points such as mooring tension, fatigue life, bottoming of a polyester cable and the like, improves the operation safety of a platform, effectively saves construction and purchase costs, and also provides a solution for the design of a novel cylindrical FPSO mooring system with a buoy, which is suitable for the south China sea area.
Drawings
FIG. 1 is a top view of a multi-point mooring system suitable for a cylindrical FPSO according to one embodiment of the present invention;
FIG. 2 is a side view of a multi-point mooring system suitable for a cylindrical FPSO according to one embodiment of the invention;
FIG. 3 is a schematic illustration of the connection of buoys in a spread mooring system as provided in the prior art;
FIG. 4 is a schematic illustration of the connection of buoys in a spread mooring system according to another embodiment of the invention;
The reference numerals are as follows:
1-upper anchor chain; a 2-connector; 3-feeding a polyester cable; 4-floating pontoon; 5-lower polyester cable; 6-quick connector; 7-lower anchor chain; 8-suction piles; 9-polyester cable; 10-buoy chains; 11-triangle; 12-mounting a chain; 13-D shackle; 14-buoyancy blocks; 15-bolts.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," "third," "fourth," "upper," "lower," "left-right," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As shown in fig. 1 and 2, the present invention provides a spread mooring system suitable for a cylindrical FPSO, comprising:
each group of mooring ropes comprises a plurality of mooring ropes, each mooring rope comprises an upper anchor chain 1, a lower anchor chain 7, an upper polyester rope 3, a lower polyester rope 5 and a buoy 4, the upper end of the upper anchor chain 1 is connected with a guide rope hole of a floating production platform through a platform chain, the lower end of the upper anchor chain 1 is connected with the upper end of the upper polyester rope 3 through a mounting chain 12, the two ends of the buoy 4 are respectively connected with the lower end of the upper polyester rope 3 and the upper end of the lower polyester rope 5, the lower end of the lower polyester rope 5 is connected with the upper end of the lower anchor chain 7 through the mounting chain 12, and the lower end of the lower anchor chain 7 is connected to a mud inlet point, so that a multi-point mooring system is formed. The form of the pontoon 4 is not limited to the off-line and on-line pontoon forms shown in fig. 3 and 4.
Based on the multipoint mooring system, the invention also provides a design method of the system, which comprises the following steps:
step S1: preliminarily determining the number and the direction of mooring ropes;
Step S2: determining the radius of mooring ropes, the position and the size of a pontoon 4, the components and the properties of each section;
step S3: and (5) carrying out mooring performance analysis, and confirming the attribute of each section in the mooring rope.
Further, step S1 includes the steps of:
Step S11: for cylindrical FPSOs, polyester cable tensioning mooring systems often take the form of 3×4 (three total groups of mooring cables, 4 each), for 3×4 mooring systems, a symmetrical structure is generally adopted, the included angle between each group of mooring cables is 120 degrees, and the included angle between each group of mooring cables is 2 degrees, in which case, when the orientation of one group of mooring cables is known to be determined, the orientations of the remaining two groups of mooring cables can be obtained;
Step S12: and (5) collecting ocean environment conditions, and determining the orientation of the mooring cable according to the extreme value direction of the south China sea wind and waves, the arrangement of submarine cables and the position of a living building.
Further, step S2 includes the steps of:
Step S21: collecting marine geological data, determining the position of an anchor point, and in order to ensure that the tension meets the requirement, the mooring radius of a tension mooring system is usually larger, and the mooring radius of a cylindrical FPSO tension mooring system with 10 ten thousand tons of water drainage of 300m or so is generally set to 2500m or so in combination with special environmental conditions and geological conditions of the south China sea area;
Step S22: because of the long mooring radius, the mooring line components include: an upper anchor chain 1, a lower anchor chain 7, an upper polyester cable 3, a lower polyester cable 5, a pontoon 4 and a mounting chain 12;
Step S23: the length of each section is selected by fully considering the capacity of the transport ship and the tensioning requirement during installation, generally, the single-end length of the polyester cable 9 should not be more than 1400m for the transport ship, and the length of the upper anchor chain 1 is preferably more than 200m for the tensioning stage after the platform is in place;
Step S24: the former project data is collected, the attributes of the components of each section of the mooring rope are preliminarily determined, attention is paid to the fact that the selection of the buoy 4 needs to meet the requirements that the polyester cable 9 cannot bottom out, the tension of the mooring system meets the requirements of standards and the related requirements of fatigue life, and the former delivery performance of a supplier needs to be fully considered.
Further, step S3 includes the steps of:
Step S31: performing frequency-time domain computational analysis of the preliminary selected mooring system by potential flow business software such as aqwa, wadam, orcaflex or simo-riflex;
Step S32: the calculation result of the frequency domain-time domain calculation analysis is evaluated, the tension and fatigue requirements of the mooring system and the requirement that the polyester cable 9 cannot bottom out are considered, and other professional requirements, such as whether the maximum deflection can meet the limit requirement of the vertical pipe and whether the lifting force at the anchor point can be born by the pile foundation, are met; the properties of the mooring line composition are continuously adjusted by these requirements until all requirements are met. (e.g., distribution of length of each segment, selection of radius, stiffness, breaking load of each segment, properties of the pontoon, and location of the pontoon).
In the mooring analysis process, generally, for tension mooring, the tension is a first control requirement and must be placed at a first priority, tension analysis needs to fully consider the tension of each section of a cable, the tension meets the requirement according to a safety coefficient of the requirements related to class society such as DNV, ABS, CCS, BV, and for a polyester cable mooring system, the rigidity has strong nonlinear characteristics, so that the relation between the static rigidity after installation and the dynamic rigidity during operation needs to be calculated by using a recommended formula of DNV, ABS or API.
Fatigue strength of a steel structure in a mooring system needs to fully consider fatigue of the steel structure including tension fatigue, vortex induced motion fatigue and out-of-plane bending fatigue, a wave walk graph is often used to obtain input environmental conditions, cycle times of stress and tension under different amplitudes and periods are obtained by a rain flow calculation method according to a time domain calculation result, and fatigue life is checked through an SN or TN curve. The requirement that the polyester cable 9 cannot bottom out is mainly that the impact of the steel structure bottoming out of the connection between the polyester cable 9 and the lower anchor chain 7 against the polyester cable 9 risks damaging the structure of the polyester cable 9, which in turn leads to a reduced mooring system life.
Step S33: performing a reduced-scale model experiment on the mooring rope, mainly focusing on whether the tension of the mooring rope can be matched with a result obtained by numerical simulation;
because of the overlong mooring radius of the mooring system and the size of the pool, the model experiment is difficult to simulate the full-size mooring system under the reduced scale, and the mooring system is often required to be cut off, so that effective fatigue and bottoming data of the polyester cable 9 are difficult to obtain, but the tension data are still effective in the process of performing and model experiment calibration. Note that the model of the numerical simulation and the mooring system parameters of the experimental model remain the same during the calibration process.
Step S34: if the requirements of both steps S32 and S33 can be met, it is reasonable to state that the mooring system is selected. Specific examples are set forth below.
Example 1
The embodiment provides a mooring mode, and the operation water depth of the ocean platform is 313m. The structure thereof is described in detail below.
Table 1 shows the components of the mooring line segments
The mooring system is composed of 8 segments in total, the length of segment 1, i.e. the upper chain 1, being adjusted according to the pretension requirements. In this embodiment the pretension of the upper chain 1 in the mooring system is 12% of the breaking load, the pretension can be adjusted according to specific requirements, the pretension of the taut mooring system is typically between 10% and 16% of the breaking load.
Fig. 1 is a top view of a mooring system arrangement, wherein the northeast 45-degree direction is the direction of the maximum wind and wave load, one group of mooring lines is arranged, the included angle between the other two groups of mooring lines and the group of mooring lines is 120 degrees, and the cable spacing in each group of mooring lines is 2 degrees.
Fig. 2 is a cross-sectional view of the mooring system, and specific information is shown in table 1.
Fig. 3 shows a connection form of a conventional pontoon 4, wherein the pontoon 4 and a mounting chain 12 are connected by a triangular plate 11, and the mounting chain 12 is respectively arranged at the left and right sides of the pontoon 4 by about 7m (the position of the pontoon 4 is in the middle of the section 4 of table 1). The connection form of the pontoon 4 is most common, and the pontoon 4 has a plurality of suppliers and has rich performance, but due to a plurality of accessory components and the need of installing the chain 12, the weight near the pontoon 4 is increased, and the net buoyancy of the pontoon 4 is reduced.
Example 2
This embodiment provides another mooring mode, and its structure is described in detail below.
Table 2 shows the components of the mooring line segments
The difference between the embodiment and the embodiment 1 is that the connection mode of the pontoon 4 is that the embodiment adopts an on-line pontoon, as shown in fig. 4, the pontoon 4 can be directly connected between the polyester cables 9 at two ends, and accessory components such as a chain 12, a triangular plate 11 and the like are not needed to be installed, so that the weight around the pontoon 4 can be reduced to a great extent, and further, a better buoyancy effect is achieved. In fig. 4, two buoyancy blocks forming the pontoon 4 are shown, and the polyester cable 9 can pass through the two buoyancy blocks, wherein the upper two buoyancy blocks are connected with the lower buoyancy block by bolts 15, and the specific connection mode is determined by a supplier. The on-line buoy has no special requirements on the weaving process and material properties of the polyester cable 9.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A multi-point mooring system adapted for a cylindrical FPSO, comprising:
Each group of mooring ropes comprises a plurality of mooring ropes, each mooring rope comprises an upper anchor chain, a lower anchor chain, an upper polyester rope, a lower polyester rope and a buoy, the upper end of the upper anchor chain is connected with a guide rope hole of a floating production platform through a platform chain, the lower end of the upper anchor chain is connected with the upper end of the upper polyester rope through a mounting chain, the two ends of the buoy are respectively connected with the lower end of the upper polyester rope and the upper end of the lower polyester rope, the lower end of the lower polyester rope is connected with the upper end of the lower anchor chain through a mounting chain, and the lower end of the lower anchor chain is connected to a mud inlet point, so that the multipoint mooring system is formed; the pontoon is an on-line pontoon.
2. The spread mooring system according to claim 1, wherein the direction of the mooring lines among the plurality of sets of mooring lines is determined based on wind and wave loads, subsea pipeline routing, riser offset requirements, upper module placement.
3. The spread mooring system according to claim 1, wherein when the spread mooring system is a tension mooring system, the number of mooring lines in each group is at least 3.
4. A multi-point mooring system according to claim 3 wherein the included angle between each set of mooring lines is 120 ° and the included angle between two adjacent mooring lines between sets is 2 °.
5. A method of designing a spread mooring system according to any one of claims 1-4, comprising the steps of:
preliminarily determining the number and the direction of the mooring ropes;
Determining the radius, composition and properties of the mooring line and segments;
And carrying out mooring performance analysis, and confirming the attribute of each section in the mooring rope.
6. The design method according to claim 5, wherein the preliminary determination of the number and orientation of the mooring lines comprises the steps of:
For a cylindrical FPSO, the tensioning mooring system adopts three groups of mooring ropes, wherein the number of the mooring ropes in each group is at least 3, the included angle between every two adjacent mooring ropes is 120 degrees, and the included angle between every two adjacent mooring ropes is 2 degrees;
And (5) collecting marine environment conditions, and determining the direction of the mooring lines according to wind and wave loads, submarine pipeline routing, riser deflection requirements and upper module arrangement.
7. The method of designing according to claim 5, wherein determining the radius, composition and properties of the mooring line segments comprises the steps of:
collecting ocean geological data and determining the position of an anchor point;
the mooring line comprises the following components: an upper anchor chain, a lower anchor chain, an upper polyester cable, a lower polyester cable, a pontoon and a mounting chain;
determining the length of each segment in the mooring line;
Past project data is collected and attributes of segments of the mooring line are initially determined.
8. The method of designing according to claim 5, wherein performing a mooring performance analysis to confirm the properties of each segment in the mooring line comprises the steps of:
performing frequency domain-time domain computational analysis on the preliminarily selected mooring system by utilizing potential flow business software;
evaluating the frequency domain-time domain calculation analysis result;
Performing a reduced scale model experiment on the mooring rope, and paying attention to whether the tension of the mooring rope is matched with a numerical simulation result;
when the above requirements are met, it is reasonable to state that the choice of the multipoint mooring system is reasonable.
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