A method for installing a composite dome sub-insulation module of an LNG ship

Abstract

The present application relates to the technical field of LNG ship manufacturing, in particular to a LNG ship composite dome sub-insulation module installation method. The method comprises the following steps: performing insulating module and rubber coating position marking; laying a protective film and coating glue on the protective film; lifting the insulating module to the installation position and installing the insulating module; coating glue on the side before installing the next insulating module; installing the stud position glass wool; installing the stud position small sealing plate and scraping glue around the sealing plate; installing the nut gasket after the small sealing plate is installed in place; installing the screw after the insulating module is installed in place; installing glass wool at the position of the protruding module pipe, then installing plywood hoop, the hoop is close to the pipe, the hoop is coated with glue and nailed; polishing the position of the sealing plate between the insulating modules, and then the sealing plate between the insulating modules is fully coated with glue and nailed. The LNG ship composite dome sub-insulation module installation method can improve the installation quality of the insulating module and shorten the installation period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LNG ship manufacturing, in particular to a LNG ship composite dome sub-insulation module installation method. BACKGROUND

[0002] Due to the rapid development of the world economy, the impact of the oil crisis and the increasing environmental problems caused by oil 、 The consumption of natural gas, one of the three pillars of the world's energy, has risen sharply, and it has been increasingly favored by countries as a clean energy source. Many countries have therefore listed it as the first choice of energy. LNG ships are one of the most difficult and technically demanding civilian ships to build in the world at present, and only a few countries can build them.

[0003] With the implementation of the International Maritime Organization's "Sulfur Limitation" in 2020, more and more shipowners consider using MARK3 fuel tanks when building new ships or modifying existing ships into dual-fuel power ships. MARK3 membrane tank has the advantages of short construction period, low evaporation rate, large cargo tank volume, and good anti-sloshing performance. Compared with NO96 series, the total thickness of MARK3 series insulation can be reduced by 50% under the same cargo tank evaporation rate, and the tank volume is greatly increased.

[0004] The hoisting of the pump tower and the composite dome is an important node in the construction of the MARK3 containment system, which directly affects the shipbuilding period in the dock. The installation of the composite dome can only be carried out after the welding of the composite dome area corrugated plate is completed, otherwise due to the small gap between the composite dome and the composite dome area corrugated plate, the installation and welding of the corrugated plate cannot be carried out. Due to the width of the ultra-large container ship reaching 60 meters, the pump tower and the composite dome can only be hoisted by the gantry crane in the dock, and cannot be hoisted in the dock, thus increasing the shipbuilding period in the dock, therefore it is necessary to study a composite dome sub-insulation module installation method to make the hoisting of the composite dome no longer affected by the welding of the composite dome area corrugated plate. SUMMARY

[0005] The purpose of the present application includes providing a LNG ship composite dome sub-insulation module installation method, which can improve the installation quality of the insulation module and shorten the installation period.

[0006] The embodiments of the present application can be implemented as follows:

[0007] The present application provides a LNG ship composite dome sub-insulation module installation method, comprising:

[0008] Mark the insulation module and the glue application position;

[0009] Lay a protective film and apply glue on the protective film;

[0010] Lift the insulation module to the installation position, install the insulation module, check the layer difference while applying the torque, and stop applying the torque when there is no layer difference;

[0011] Before installing the next insulation module, apply glue to the side surface, first apply a round cake to the middle and lower part, with a spacing of 200 mm between the round cakes, then scrape it open with a scraper to coat the entire surface, and scrape off the squeezed glue after installation. Record the glue application time and the insulation module installation end time within the working hours.

[0012] Install the glass wool at the stud position; install the small sealing plate at the stud position, and scrape the glue around the sealing plate; after the small sealing plate is installed in place, install the nut gasket.

[0013] After the insulation module is installed in place, install the screw.

[0014] Install glass wool at the pipe position of the protruding module, then install the plywood hoop, which tightly clings to the pipe, and apply glue and nails to the hoop.

[0015] Grind the position of the sealing plate between the insulation modules, requiring no layer difference, install the sealing plate, and the sealing plate between the insulation modules needs to be fully coated with glue, leaving only a 30 mm range around the screw hole without scraping glue, and then nailing.

[0016] In an optional embodiment, the step of laying the protective film comprises:

[0017] Fix the edge of the protective film with the stainless steel using adhesive tape, and fix the edge of the hole with the stainless steel pipe using adhesive tape, overlap the two protective films, then fix the overlapping area with adhesive tape, and protect the boundary area before lifting the cover.

[0018] In an optional embodiment, the large cake of glue applied to the protective film has a diameter of 40 mm and a height of 5-10 mm, and the maximum spacing of the glue is 300 mm.

[0019] In an optional embodiment, when installing the nut gasket, the torque value is first 30 N.m, the layer difference is adjusted, and the layer difference between the modules is controlled within 0.5 mm. Before installing the sealing plate between the insulation modules, the surface of the module is ground flat to allow the sealing plate to tightly contact the module.

[0020] In an optional embodiment, after the insulation module is installed in place, the screw is first coated with PU45 glue before installation, and the torque is applied after the glue hardens, with a torque value of 40 N.M.

[0021] In an optional embodiment, after the insulation module is installed in place, the composite dome cover is lifted.

[0022] In an optional embodiment, after the composite dome cover is lifted, the installation steps of the boundary module comprise:

[0023] The boundary module is cut into three layers in the height direction, and is installed by being tilted into the boundary module;

[0024] According to the distance between the measuring plane module and the corrugated plate, it is determined whether the side of the module with corrugations needs to be cut, so that the distance between the module and the corrugated plate is 15±10mm;

[0025] The position of applying TBP glue on the bottom surface of the module is marked;

[0026] A 0.06mm protective film is laid, the edges of the protective film are fixed to the stainless steel by using adhesive tape, full adhesion is not required, and 3 sections of adhesion on each side are sufficient, the edges of the hole are fixed to the stainless steel pipe by using adhesive tape, the two protective films are overlapped, and then the overlapping area is fixed by using adhesive tape;

[0027] The glue is applied on the bottom layer module, and the TBP glue is fully applied on the middle layer and the upper layer module;

[0028] The bottom module is installed, and after the bottom module is installed in place, the middle layer and the upper layer insulation module are installed in sequence;

[0029] After the module is installed in place, the pressing plate and the torsion force are used to fix the module;

[0030] After the glue hardens, the torsion force is applied, and the torsion force value is 40N.M.

[0031] In an optional embodiment, the boundary module is cut into three layers in the height direction, and each layer has a height of 100mm.

[0032] In an optional embodiment, the diameter of the glue cake on the bottom layer module is 40mm, and the height is 5-10mm.

[0033] The LNG ship composite dome sub-insulation module installation method provided by the embodiment has the following beneficial effects:

[0034] The LNG ship composite dome sub-insulation module installation method comprises the following steps:

[0035] The insulation module and the position of applying glue are marked;

[0036] The protective film is laid, and the glue is applied on the protective film;

[0037] The insulation module is lifted to the installation position, the insulation module is installed, the torsion force is applied on one side, and the layer difference is checked on the other side, and when there is no layer difference, the application of the torsion force is stopped;

[0038] Before installing the next insulation module, the side is coated with glue, the middle and lower round cakes are first put on, the distance between the round cakes is 200mm, then the scraper is scraped open, the whole surface is coated, the squeezed glue is scraped clean after installation, the glue coating time is recorded, and the insulation module installation end time is within the working time range;

[0039] Install the stud position glass wool; install the stud position small sealing plate, and scrape the glue around the sealing plate; after the small sealing plate is installed in place, install the nut gasket;

[0040] After the insulation module is installed in place, install the screw;

[0041] Install the glass wool at the pipe position of the protruding module, then install the plywood hoop, the hoop is close to the pipe, the hoop is coated with glue and nailed;

[0042] Grind the position of the sealing plate between the insulation modules, and require no layer difference, install the sealing plate, and the sealing plate between the insulation modules needs to be fully coated with glue, only the periphery of 30mm around the screw hole is not scraped, and then the screw is installed.

[0043] The LNG ship composite dome sub-insulation module installation method can improve the installation quality of the insulation module and shorten the installation period. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0045] Figure 1 The step schematic diagram of the LNG ship composite dome sub-insulation module installation method provided by the present embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0048] It should be noted that like reference numerals and characters refer to like elements throughout the several views of the drawings, and that, unless otherwise indicated, like elements that are depicted in multiple figures have the same reference number and character designation.

[0049] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate relative positions or orientation based on the orientation or position shown in the drawings, or the orientation or position in which the product of the present application is normally placed during use, and are merely intended to facilitate the description of the present application and simplify the description, and therefore cannot be construed as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0050] In addition, the terms "first", "second", and the like are used only to distinguish the description and cannot be construed as indicating or implying relative importance.

[0051] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0052] Please refer to Figure 1 The embodiment provides a LNG ship composite dome sub-insulation module installation method, which comprises the following steps:

[0053] Marking lines on the insulation module and the rubber coating position;

[0054] Laying a protective film and coating glue on the protective film;

[0055] Lifting the insulation module to the installation position, installing the insulation module, twisting one side, and checking the layer difference, and stopping applying the torsion force when there is no layer difference;

[0056] Before installing the next insulation module, the side is coated with glue, the middle and lower round cakes are first put on, the distance between the round cakes is 200mm, then the scraper is used to scrape open, the whole surface is coated, the squeezed glue after installation is scraped clean, the glue coating time is recorded, and the insulation module installation end time is within the working time range;

[0057] Installing glass wool at the stud position; installing a small sealing plate at the stud position, scraping glue around the sealing plate; after the small sealing plate is installed in place, the nut gasket is installed;

[0058] After the insulation module is installed in place, the screw is installed;

[0059] Installing glass wool at the pipe position of the convex module, then installing a plywood hoop, the hoop is close to the pipe, the hoop is coated with glue and nailed;

[0060] Grind the position of installing the sealing plate between the insulation modules, and require no layer difference. Install the sealing plate, and the sealing plate between the insulation modules needs to be fully coated with glue, leaving only the screw hole periphery 30mm range without scraping glue, and then punch the nails.

[0061] Please refer to Figure 1 The LNG ship composite dome sub-insulation module installation method can improve the installation quality of the insulation module and shorten the installation period. Specifically, no wooden wedge is used to level the insulation module below, glue is applied under the insulation module, the module is leveled after extruding the glue, the module installation period is shortened; a protective film is laid on the surface of the cover to separate the cover and the glue, so as to avoid tearing the glue due to the cold shrinkage of the stainless steel; only the middle area insulation module is installed before the composite dome is hoisted, so as to shorten the shipyard construction period; the boundary insulation module is divided into three layers along the height direction, so as to eliminate the interference between the boundary module and the corrugated plate.

[0062] Further, please refer to Figure 1 In this embodiment, the step of laying the protective film includes:

[0063] The edge of the protective film is fixed with adhesive tape and stainless steel, the edge of the hole is fixed with adhesive tape and stainless steel pipe, the two protective films are overlapped, and then the overlapping area is fixed with adhesive tape, and the boundary area is protected before the cover is hoisted.

[0064] Moreover, the diameter of the glue cake applied to the protective film is 40mm, and the height is 5-10mm, and the maximum interval of the glue is 300mm. In addition, when installing the nut gasket, the torque value is first 30N.m, the layer difference is adjusted, the layer difference between the modules is controlled within 0.5mm, and the surface of the module is ground before the sealing plate between the insulation modules is installed, so that the sealing plate tightly contacts the module. After the insulation module is installed in place, the screw is coated with PU45 glue before the screw is installed; and after the glue hardens, a torque is applied, and the torque value is 40N.M.

[0065] Further, please refer to Figure 1 In this embodiment, the LNG ship composite dome sub-insulation module installation method further includes hoisting the composite dome after the insulation module is installed in place.

[0066] Specifically, after the composite dome is hoisted, the installation steps of the boundary module include:

[0067] The boundary module is cut into three layers along the height direction, and is installed obliquely;

[0068] According to the measurement of the distance between the plane module and the corrugated plate, it is determined whether the corrugated side of the module needs to be cut, so as to ensure that the distance between the module and the corrugated plate is 15±10mm;

[0069] Mark the position of applying TBP glue on the bottom surface of the module;

[0070] Lay 0.06mm protective film, the edge of the protective film is fixed with the stainless steel by tape, full sticking is not required, 3 sections of adhesion on each side are enough, the edge of the hole is fixed with the stainless steel pipe by tape, the two protective films are overlapped, and then the overlapping area is fixed by tape;

[0071] Apply glue on the bottom module, and fully coat TBP glue on the middle and upper modules;

[0072] Install the bottom module, and then install the middle and upper insulation modules after the bottom module is installed in place;

[0073] After the module is installed in place, use a pressing plate and apply a torsion force to fix the module;

[0074] After the glue hardens, apply a torsion force with a value of 40N.M.

[0075] In this embodiment, the boundary module is cut into three layers along the height direction, each layer being 100mm high. The glue cake on the bottom module has a diameter of 40mm and a height of 5-10mm.

[0076] In summary, please refer to Figure 1 , the working process of the LNG ship composite dome sub-insulation module installation method is as follows:

[0077] Draw lines on the module and the glue application position;

[0078] Lay protective film, the edge of the protective film is fixed with the stainless steel by tape, the edge of the hole is fixed with the stainless steel pipe by tape, the two protective films are overlapped, and then the overlapping area is fixed by tape, the boundary area is protected before the cover is hung.

[0079] Apply glue on the protective film, the glue cake has a diameter of 40mm and a height of 5-10mm, and the maximum glue interval is 300mm;

[0080] Lift the module to the installation position, install the module, apply a torsion force while checking the layer difference, and stop applying the torsion force when there is no layer difference;

[0081] Before installing the next module, apply glue to the side, first apply a round cake on the middle and lower layers, the distance between the round cakes is about 200mm, then use a spatula to scrape it open, apply glue to the entire surface, scrape off the squeezed glue after installation, record the glue application time, and the module installation end time should be within the working hours.

[0082] Install the stud position glass wool;

[0083] Install the small sealing plate at the stud position, and scrape glue around the sealing plate. Note that the glue should not be applied to the screw hole. After the small sealing plate is installed, install the nut and gasket, and then apply a torque of 30 N.m. Adjust the layer difference between the modules to be within 0.5 mm. Before installing the sealing plate between the modules, grind the surface of the module to ensure that the sealing plate tightly contacts the module.

[0084] After the module is installed, start screwing. Before screwing, apply PU45 glue to the screw.

[0085] After the glue hardens, apply a torque of 40 N.M.

[0086] Install glass wool at the position of the protruding module pipe, and then install the plywood hoop. The hoop should tightly contact the pipe, and the hoop should be coated with glue and nailed.

[0087] Grind the position of the sealing plate between the modules to ensure that there is no layer difference. Install the sealing plate, and the sealing plate between the modules should be fully coated with glue, except for the 30 mm range around the screw hole. Then, screw.

[0088] It should be noted that the module in the foregoing steps is an insulation module.

[0089] After the composite dome is hoisted, the boundary module is installed according to the following steps:

[0090] It should be noted that the module in the following steps is a boundary module.

[0091] Because the corrugated plate in the composite dome area has been welded, the protruding part of the corrugated plate causes the boundary module to be unable to be installed. Therefore, the module is cut into three layers in the height direction, and each layer has a height of 100 mm. When installed, the module is tilted and installed.

[0092] According to the distance between the measured plane module and the corrugated plate, it is determined whether the module needs to be cut on the side with the corrugation to ensure that the distance between the module and the corrugated plate is 15 ± 10 mm.

[0093] Draw the position of applying TBP glue on the bottom surface of the module

[0094] Lay 0.06 mm protective film. The edges of the protective film are fixed to the stainless steel with adhesive tape. Full adhesion is not required. Three sections of adhesion on each side are sufficient. The edges of the hole are fixed to the stainless steel pipe with adhesive tape (full adhesion). The two pieces of protective film are overlapped by about 70-100 mm. Then, the overlapping area is fixed with adhesive tape.

[0095] Apply glue to the bottom layer module. The diameter of the glue disc is 40 mm, and the height is 5-10 mm. Apply TBP glue to the middle layer and the upper layer module.

[0096] The bottom module is installed, and after the bottom module is installed in place, the middle layer and the upper layer insulation module are installed.

[0097] After the module is installed in place, the module is fixed by using a pressing plate and applying a torque.

[0098] After the glue hardens, a torque of 40 N.M. is applied.

[0099] Based on the above, the LNG ship composite dome sub-insulation module installation method has the following advantages:

[0100] The insulation module is not leveled by using a wooden wedge block below, glue is applied below the insulation module, and the module is leveled after the glue is extruded, thereby shortening the module installation period.

[0101] The space between the insulation module and the composite dome is filled with glue, and the load bearing of the insulation module is more optimal.

[0102] The composite dome hoisting is not affected by the installation and welding of the corrugated plate, and after the composite dome is hoisted, the ship can be docked, thereby shortening the ship dock construction period.

[0103] The boundary insulation module is divided into three layers in the height direction, the interference between the boundary module and the corrugated plate is eliminated, and the boundary insulation module installation is more convenient.

[0104] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of installing a composite dome sub-insulation module of an LNG carrier, characterized by, The method comprises the following steps: insulation module and rubber coating position marking; laying protective film and coating rubber on the protective film; lifting the insulation module to the installation position, installing the insulation module, checking the layer difference while applying the torque, and stopping applying the torque when there is no layer difference; before installing the next insulation module, coating the side with rubber, first putting the middle and lower round cakes with a distance of 200mm between the round cakes, then scraping with a scraper to coat the whole surface, scraping the squeezed rubber after installation, recording the rubber coating time, and the insulation module installation end time being within the working time range; installing the glass wool at the stud position and installing the small sealing plate at the stud position and scraping rubber around the sealing plate; installing the screw after the insulation module is installed in place; installing the glass wool at the pipe position of the convex module, then installing the plywood hoop, the hoop being close to the pipe, the hoop being coated with rubber and being nailed; polishing the position of the sealing plate between the insulation modules, requiring no layer difference, installing the sealing plate, and the sealing plate between the insulation modules being fully coated with rubber, only leaving a range of 30mm around the screw hole without scraping rubber, and then nailing; wherein, before hoisting the composite dome cover, only the middle area insulation module is installed; after hoisting the composite dome cover, the boundary module is cut into three layers in the height direction, and is installed by tilting.

2. The LNG ship composite dome sub-insulation module installation method of claim 1, wherein, The step of laying the protective film comprises: fixing the edge of the protective film with the stainless steel by using adhesive tape, fixing the edge of the hole with the stainless steel pipe by using adhesive tape, overlapping the two protective films, and then fixing the overlapping area by using adhesive tape, and protecting the boundary area before hoisting the cover.

3. The LNG ship composite dome cover insulation module installation method according to claim 1, wherein: the diameter of the large cake of rubber coated on the protective film is 40mm, the height is 5-10mm, and the maximum interval of the rubber is 300mm.

4. The LNG ship composite dome cover insulation module installation method according to claim 1, wherein: when installing the nut gasket, the torque value is 30N.m, the layer difference is adjusted, the layer difference between the modules is controlled within 0.5mm, and the module surface is polished before installing the sealing plate between the insulation modules, so that the sealing plate tightly contacts the module.

5. The LNG ship composite dome cover insulation module installation method according to claim 1, wherein: after the insulation module is installed in place, the screw is coated with PU45 rubber before being installed, and the torque is applied after the rubber hardens, and the torque value is 40N.M.

6. The LNG ship composite dome cover insulation module installation method according to any one of claims 1-5, wherein: after the insulation module is installed in place, the composite dome cover is hoisted.

7. The LNG ship composite dome sub-insulation module installation method according to claim 6, characterized by, after the composite dome cover is hoisted, the installation steps of the boundary module comprise: determining whether the module with corrugation needs to be cut according to the distance between the measured plane module and the corrugated plate, so as to ensure that the distance between the module and the corrugated plate is 15±10mm; drawing the position of coating TBP rubber on the bottom surface of the module; Lay 0.06mm protective film, the edge of the protective film is fixed with stainless steel by tape, it is not necessary to stick completely, 3 sections of each side can be adhered, the edge of the hole is fixed with stainless steel tube by tape, the two protective films are overlapped, then the overlapping area is fixed by tape; Coat glue on the bottom module, coat TBP glue on the middle and upper modules; Install the bottom module, then install the middle and upper insulation modules; After the module is installed, use the pressing plate and apply torque to fix the module; After the glue is hardened, apply torque, the torque value is 40N.M.

8. The LNG ship composite dome sub-insulation module installation method according to claim 7, characterized in that: The boundary module is cut into three layers in the height direction, and the height of each layer is 100mm.

9. The LNG ship composite dome sub-insulation module installation method according to claim 7, characterized in that: The diameter of the glue cake on the bottom module is 40mm, and the height is 5-10mm.

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