LNG ship liquid cargo hold manhole passage structure and installation method

Abstract

The embodiment of the application provides a kind of LNG ship liquid cargo hold manhole passage structure and installation method, belong to ship technical field.LNG ship liquid cargo hold manhole passage structure includes manhole flange, first cover and passage escalator, manhole flange has first through-hole;First cover is covered on manhole flange, and first cover is provided with air pipe arrangement mouth, kinetic energy pipeline arrangement mouth and personnel import and export, and passage escalator is arranged in personnel import and export, and one end of passage escalator is connected with the hole wall of personnel import and export, and the other end of passage escalator extends and is provided in the direction of manhole flange;Second cover is covered on personnel import and export, and second cover is movably arranged in personnel import and export, to be used for closing or opening personnel import and export.This LNG ship liquid cargo hold manhole passage structure can reasonably arrange personnel passage and kinetic energy pipeline, so that the temperature and humidity in liquid cargo hold reach design requirement, ensure that inwa does not rust, guarantee the construction quality of liquid cargo hold.

Description

TECHNICAL FIELD

[0001] The present application relates to the ship technology field, in particular, relates to a LNG ship liquid cargo tank manhole passage structure and installation method. BACKGROUND

[0002] In the late stage of the construction of the LNG ship liquid cargo tank, due to the hoisting of the pump tower and the liquid dome section, the side process hole is closed, but at this time, there is still a large amount of installation and debugging work inside the liquid cargo tank, at this time, the manhole of the liquid dome becomes the only entrance and exit for personnel, equipment, materials and kinetic energy pipeline, and is also the only ventilation position.

[0003] As known, in addition to the conventional construction precision in the construction process, the protection of the invar is also the most important part of the entire construction work, especially the work of preventing the invar steel from rusting in the liquid cargo tank, the quality of the invar steel plays a key role in the loading and unloading of the LNG ship, and the key indicator of preventing the invar steel from rusting is the control of the temperature and humidity of the liquid cargo tank, so how to coordinate the normal debugging work of the liquid cargo tank and ensure that the invar does not rust is particularly important. SUMMARY

[0004] The LNG ship liquid cargo tank manhole passage structure and installation method provided by the embodiment of the present application can reasonably arrange personnel passages and kinetic energy pipelines, so that the temperature and humidity in the liquid cargo tank meet the design requirements, ensure that the invar does not rust, and ensure the construction quality of the liquid cargo tank.

[0005] In a first aspect, the embodiment of the present application provides a LNG ship liquid cargo tank manhole passage structure, which comprises a manhole flange, a first cover plate and a passage escalator, the manhole flange has a first through hole; the first cover plate is arranged on the manhole flange, and the first cover plate is used for closing the first through hole; the first cover plate is provided with an air pipe arrangement opening, a kinetic energy pipeline arrangement opening and a personnel entrance and exit, the air pipe arrangement opening is used for arranging the air pipe of a dehumidifier, and the kinetic energy pipeline arrangement opening is used for arranging the kinetic energy pipeline; the passage escalator is arranged in the personnel entrance and exit, one end of the passage escalator is connected with the hole wall of the personnel entrance and exit, and the other end of the passage escalator extends in the direction of the manhole flange; wherein, a second cover plate is arranged on the personnel entrance and exit, and the second cover plate is movably arranged on the personnel entrance and exit, so as to close or open the personnel entrance and exit.

[0006] In the scheme, the liquid cargo tank manhole passage structure is mainly applied to the LNG ship liquid cargo tank late construction stage, and the stage after the liquid cargo tank side process hole is closed. The first cover plate is arranged on the manhole flange, the first cover plate can close the first through hole of the manhole flange, and the personnel inlet and outlet, the air pipe arrangement opening and the kinetic energy pipe arrangement opening are arranged on the first cover plate. In this way, the air pipe of the dehumidifier is arranged in the air pipe arrangement opening, and after the air pipe of the dehumidifier is arranged, the air pipe can isolate the dry gas in the liquid cargo tank from the humid environment outside. The kinetic energy pipe arrangement opening can be arranged for the kinetic energy pipe. The personnel inlet and outlet is arranged, and the passage staircase is arranged. The second cover plate is arranged on the personnel inlet and outlet, so that the personnel can enter the liquid cargo tank for installation and debugging work, and then the second cover plate is arranged on the personnel inlet and outlet. The second cover plate can close the personnel inlet and outlet, so that the liquid dome manhole position of the liquid cargo tank is in a closed state, and the temperature and humidity in the liquid cargo tank can meet the design requirements. That is, the air pipe arrangement opening and the kinetic energy pipe arrangement opening are arranged on the first cover plate at the liquid dome manhole position. The dehumidifier works normally, and the liquid cargo tank is in a relatively closed state. The dry gas in the liquid cargo tank can be isolated from the humid environment outside. At the same time, the personnel passage and the kinetic energy pipe are reasonably arranged at the narrow liquid dome flange, so that the liquid dome manhole position of the liquid cargo tank is in a closed state, and the temperature and humidity in the liquid cargo tank can meet the design requirements.

[0007] In some embodiments, the first cover plate and the manhole flange are connected by a fastener.

[0008] In the above technical scheme, the first cover plate and the manhole flange are connected by a fastener, so that the first cover plate is stably installed at the first through hole of the manhole flange, and the installation stability of the first cover plate is high.

[0009] In some embodiments, the first cover plate is provided with a strip-shaped first mounting hole, the extension direction of the first mounting hole extends along the circumference of the first cover plate, the manhole flange is provided with a second mounting hole corresponding to the first mounting hole, and the fastener is arranged in the first mounting hole and the second mounting hole to connect the first cover plate and the manhole flange.

[0010] In the above technical scheme, after the first cover plate is hoisted on the manhole flange, the lower end of the passage staircase of the personnel inlet and outlet of the first cover plate needs to be connected with the staircase of the pump tower below, so there may be a certain connection error. By arranging a strip-shaped first mounting hole on the first cover plate, the first mounting hole is a strip-shaped hole with an arc, which can allow the first cover plate to rotate at a certain angle relative to the manhole flange, so that the passage staircase can be smoothly connected with the staircase of the pump tower, and the installation difficulty of the passage staircase is reduced.

[0011] In some embodiments, the first mounting hole is provided in a plurality of numbers, and the plurality of first mounting holes are arranged at intervals along the circumference of the first cover plate, and the positions and numbers of the second mounting holes correspond to those of the first mounting holes one by one.

[0012] In the technical solution, the number of the first mounting hole is set to be a plurality, and the plurality of first mounting holes and the plurality of second mounting holes can be correspondingly matched, so that the first cover plate and the manhole flange have a plurality of connection points, the connection strength of the first cover plate and the manhole flange is higher, and the connection stability is better.

[0013] In some embodiments, a flange gasket is further arranged between the first cover plate and the manhole flange.

[0014] In the technical solution, the flange gasket is further arranged between the first cover plate and the manhole flange, the flange gasket can play a sealing role, the sealing property of the connection between the first cover plate and the manhole flange is better, the risk of the entry of external humid air into the liquid cargo tank is reduced, the temperature and humidity in the liquid cargo tank meet the design requirements, and thus the rusting of the inwall is effectively prevented.

[0015] In some embodiments, the second cover plate is rotatably mounted on the first cover plate by a hinge.

[0016] In the technical solution, the second cover plate is rotatably mounted on the first cover plate, the opening and closing of the personnel access are facilitated, when the personnel access needs to be opened, the second cover plate only needs to be pushed upward, and the personnel access can be opened, when the personnel access needs to be closed, the second cover plate only needs to be rotated downward to cover the personnel access, the integrity is good, and the opening and closing of the personnel access are facilitated.

[0017] In some embodiments, a turned-up edge is arranged on the side of the second cover plate facing the personnel access, and the turned-up edge is arranged around the bottom wall of the second cover plate in a circumferential direction; when the second cover plate covers the personnel access, the turned-up edge is attached to the outer wall of the personnel access.

[0018] In the technical solution, the turned-up edge is arranged on the bottom of the second cover plate, when the second cover plate covers the personnel access, the turned-up edge can be attached to the outer wall of the personnel access, the sealing property of the personnel access is further improved, the entry of external humid air into the liquid cargo tank is avoided, the temperature and humidity in the liquid cargo tank meet the design requirements, and thus the rusting of the inwall is effectively prevented.

[0019] In some embodiments, a manhole ladder is arranged on the outer side of the first cover plate.

[0020] In the technical solution, the manhole ladder is arranged on the outer side of the first cover plate, and the working personnel can climb from the outside to the personnel access.

[0021] In some embodiments, the first cover plate is provided with a plurality of lifting rings, and the plurality of lifting rings are distributed along the circumference of the first cover plate.

[0022] In the technical solution, the first cover plate is provided with the lifting rings, which facilitates the lifting of the first cover plate, the lifting device is connected with the lifting rings, and the lifting convenience and safety of the first cover plate are improved.

[0023] In a second aspect, the embodiments of the present application also provide a method for installing an LNG ship liquid cargo tank manhole passage structure, the method being based on the LNG ship liquid cargo tank manhole passage structure of any of the preceding embodiments, and the method comprising the following steps: placing a flange gasket on a manhole flange, lifting the first cover plate to the manhole flange, fixing the first cover plate to the manhole flange after the first cover plate is lifted into place, installing a passage handrail at a personnel access opening of the first cover plate, and arranging a wind pipe, a cable, and a kinetic energy pipeline on the first cover plate.

[0024] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0025] 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. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Figure 1 A structural schematic diagram of the LNG ship liquid cargo tank manhole passage structure provided by some embodiments of the present application is shown in the figure.

[0027] Figure 2 A structural schematic diagram of the LNG ship liquid cargo tank manhole passage structure provided by some embodiments of the present application is shown in the figure.

[0028] Figure 3 A structural schematic diagram of the LNG ship liquid cargo tank manhole passage structure provided by some embodiments of the present application is shown in the figure.

[0029] Figure 4 A structural schematic diagram of the LNG ship liquid cargo tank manhole passage structure provided by some embodiments of the present application is shown in the figure.

[0030] Figure 5 A structural schematic diagram of the LNG ship liquid cargo tank manhole passage structure provided by some embodiments of the present application is shown in the figure.

[0031] Icon: 10 - manhole flange; 11 - first through hole; 12 - second mounting hole; 20 - first cover plate; 21 - air pipe arrangement opening; 22 - kinetic energy pipe arrangement opening; 23 - personnel access; 24 - first mounting hole; 25 - hoisting lifting ring; 30 - passage staircase; 40 - second cover plate; 50 - hinge; 60 - manhole staircase; 200 - liquid dome. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than 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.

[0033] 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. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] EMBODIMENT

[0038] The embodiments of the present application provide a LNG ship liquid cargo tank manhole passage structure, please refer toFigures 1 to 5 The LNG ship liquid cargo tank manhole passage structure comprises a manhole flange 10, a first cover plate 20 and a passage staircase 30, the manhole flange 10 is provided with a first through hole 11; the first cover plate 20 is arranged on the manhole flange 10, and the first cover plate 20 is used for closing the first through hole 11; the first cover plate 20 is provided with a wind pipe arrangement opening 21, a kinetic energy pipe arrangement opening 22 and a personnel access opening 23, the wind pipe arrangement opening 21 is used for arranging the wind pipe of a dehumidifier, and the kinetic energy pipe arrangement opening 22 is used for arranging the kinetic energy pipe; the passage staircase 30 is arranged in the personnel access opening 23, one end of the passage staircase 30 is connected with the hole wall of the personnel access opening 23, and the other end of the passage staircase 30 extends in the direction of the manhole flange 10; wherein the second cover plate 40 is arranged on the personnel access opening 23, and the second cover plate 40 is movably arranged on the personnel access opening 23, so as to close or open the personnel access opening 23.

[0039] In the scheme, the liquid cargo tank manhole passage structure is mainly applied to the later construction stage of the LNG ship liquid cargo tank and the stage after the liquid cargo tank side process hole is closed. The first cover plate 20 is arranged on the manhole flange 10, the first cover plate 20 can close the first through hole 11 of the manhole flange 10, and the wind pipe arrangement opening 21, the kinetic energy pipe arrangement opening 22 and the personnel access opening 23 are arranged on the first cover plate 20, so that the wind pipe of the dehumidifier is arranged in the wind pipe arrangement opening 21, after the dehumidifier wind pipe is arranged, the dehumidifier wind pipe can isolate the dry gas in the liquid cargo tank from the humid environment outside, the kinetic energy pipe arrangement opening 22 can be arranged in the kinetic energy pipe, the personnel access opening 23 is arranged, and the passage staircase 30 is arranged, and the second cover plate 40 is arranged on the personnel access opening 23, which does not affect the personnel to enter the liquid cargo tank for installation and debugging work, the personnel can smoothly enter the liquid cargo tank through the passage staircase 30, and then the second cover plate 40 is arranged on the personnel access opening 23, the second cover plate 40 closes the personnel access opening 23, so that the liquid dome 200 manhole position of the liquid cargo tank is in a closed state, and the temperature and humidity in the liquid cargo tank meet the design requirements. That is, the wind pipe arrangement opening 21 and the kinetic energy pipe arrangement opening 22 are arranged at the first cover plate 20 of the liquid dome 200 manhole position, the dehumidifier works normally, and the liquid cargo tank is in a relatively closed state, the dry gas in the liquid cargo tank can be isolated from the humid environment outside, and the personnel passage and the kinetic energy pipe are reasonably arranged at the narrow liquid dome 200 manhole flange 10, so that the liquid dome 200 manhole position of the liquid cargo tank is in a closed state, and the temperature and humidity in the liquid cargo tank meet the design requirements.

[0040] The manhole flange 10 is arranged on the liquid dome 200 of the liquid cargo tank, and the manhole flange 10 is used for personnel access and pipe arrangement.

[0041] In some embodiments, the first cover plate 20 is screwed with the manhole flange 10 through fasteners. The first cover plate 20 is screwed with the manhole flange 10 through fasteners, so that the first cover plate 20 is stably installed at the first through hole 11 of the manhole flange 10, and the installation stability of the first cover plate 20 is high.

[0042] In some embodiments, the first cover plate 20 is screwed with the manhole flange 10 through fasteners. The first cover plate 20 is screwed with the manhole flange 10 through fasteners, so that the first cover plate 20 is stably installed at the first through hole 11 of the manhole flange 10, and the installation stability of the first cover plate 20 is high.

[0043] In some embodiments, the first cover plate 20 is screwed with the manhole flange 10 through fasteners. The first cover plate 20 is screwed with the manhole flange 10 through fasteners, so that the first cover plate 20 is stably installed at the first through hole 11 of the manhole flange 10, and the installation stability of the first cover plate 20 is high.

[0044] Specifically, when connecting the access ladder 30, there may be a situation that the ladder at the lower end of the pump tower cannot be connected. Therefore, the fasteners (flange connection bolts) on the first cover plate 20 need to be removed, and the position of the first cover plate 20 is re-rotated to the correct position, so that the access ladder 30 is connected to the ladder, and then the fasteners are used to fasten and connect the first cover plate 20 and the manhole flange 10.

[0045] In some embodiments, the number of first installation holes 24 is multiple, and the multiple first installation holes 24 are distributed along the circumference of the first cover plate 20. The positions and numbers of the second installation holes 12 correspond to the positions and numbers of the first installation holes 24 one by one. By setting the number of first installation holes 24 to be multiple, the multiple first installation holes 24 and the multiple second installation holes 12 can be correspondingly matched, so that the first cover plate 20 and the manhole flange 10 have multiple connection points, the connection strength of the first cover plate 20 and the manhole flange 10 is higher, and the connection stability is better.

[0046] In some embodiments, a flange gasket is further arranged between the first cover plate 20 and the manhole flange 10. By further arranging a flange gasket between the first cover plate 20 and the manhole flange 10, the flange gasket can play a sealing role, so that the connection sealing property of the first cover plate 20 and the manhole flange 10 is better, the risk of external humid air entering the liquid cargo tank is reduced, the temperature and humidity in the liquid cargo tank meet the design requirements, and the rusting of the invar is effectively prevented.

[0047] In some embodiments, the second cover plate 40 is rotatably mounted on the first cover plate 20 through the hinge 50. By rotatably mounting the second cover plate 40 on the first cover plate 20, the opening and closing of the personnel access 23 is facilitated. When the personnel access 23 needs to be opened, the second cover plate 40 only needs to be pushed upward, and the personnel access 23 can be opened. When the personnel access 23 needs to be closed, the second cover plate 40 only needs to be rotated downward to cover the personnel access 23, and the overall performance is good, and the opening and closing of the personnel access 23 is facilitated.

[0048] Among them, the second cover plate 40 has a high frequency of use, and the hinge 50 can be made of special material.

[0049] In some embodiments, the side of the second cover plate 40 facing the personnel access 23 is provided with a flange, and the flange is circumferentially arranged around the bottom wall of the second cover plate 40. When the second cover plate 40 covers the personnel access 23, the flange is attached to the outer wall of the personnel access 23. By providing a flange at the bottom of the second cover plate 40, when the second cover plate 40 covers the personnel access 23, the flange can be attached to the outer wall of the personnel access 23, further improving the sealing performance of the personnel access 23, preventing external humid air from entering the liquid cargo tank, ensuring that the temperature and humidity in the liquid cargo tank meet the design requirements, and effectively preventing the invar from rusting.

[0050] Among them, the personnel access 23 is arranged protruding from the upper surface of the first cover plate 20, so that the flange of the second cover plate 40 is attached to the outer peripheral wall of the personnel access 23. Of course, the inner side of the flange is provided with a rubber strip, and the side of the rubber strip close to the personnel access 23 has a wedge surface, and the rubber strip is wedge-shaped from the lower end to the upper end of the personnel access 23, and the thickness gradually increases.

[0051] In some embodiments, a manhole ladder 60 is arranged on the outer side of the first cover plate 20. By arranging the manhole ladder 60 on the outer side of the first cover plate 20, it is convenient for the worker to climb from the outside to the personnel access 23.

[0052] In some embodiments, a plurality of lifting lugs 25 are arranged on the first cover plate 20. The plurality of lifting lugs 25 are arranged on the first cover plate 20 in a circumferential direction. By arranging the lifting lugs 25 on the first cover plate 20, the lifting work of the first cover plate 20 is facilitated. The lifting device is connected with the lifting lugs 25, and the lifting convenience and safety of the first cover plate 20 are improved.

[0053] The application further provides a mounting method of the LNG ship liquid cargo tank manhole passage structure, the mounting method is based on the LNG ship liquid cargo tank manhole passage structure of any of the preceding embodiments, and the mounting method comprises the following steps: placing a flange gasket on the manhole flange 10, hoisting the first cover plate 20 to the manhole flange 10, fixing the first cover plate 20 to the manhole flange 10 after the first cover plate 20 is hoisted into place, installing the passage ladder 30 at the personnel access opening 23 of the first cover plate 20, and arranging the air pipe, the cable and the kinetic energy pipeline on the first cover plate 20.

[0054] It should be noted that the features in the embodiments of the application can be combined with each other without conflict.

[0055] The above merely describes the preferred embodiments of the application and is not intended to limit the application, and various modifications and changes can be made by those skilled in the art based on the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A manhole passage structure for an LNG carrier cargo tank, characterized in that, include: Manhole flange, having a first through hole; A first cover plate is placed on the manhole flange to seal the first through hole; the first cover plate is provided with a duct layout port, a kinetic energy pipeline layout port and a personnel entrance / exit, the duct layout port is used for the duct of the dehumidifier to pass through and the kinetic energy pipeline layout port is used for the kinetic energy pipeline to pass through and the duct of the dehumidifier to pass through and the kinetic energy pipeline layout port. An escalator is installed through the personnel entrance / exit, with one end of the escalator connected to the wall of the personnel entrance / exit, and the other end of the escalator extending toward the direction of the manhole flange. The personnel entrance / exit is provided with a second cover plate, which is movably disposed on the personnel entrance / exit for closing or opening the personnel entrance / exit; The first cover plate and the manhole flange are connected by fasteners; the first cover plate is provided with a strip-shaped first mounting hole, the extension direction of the first mounting hole is along the circumference of the first cover plate, the manhole flange is provided with a corresponding second mounting hole, and the fastener passes through the first mounting hole and the second mounting hole to connect the first cover plate and the manhole flange by screwing.

2. The manhole passage structure for the LNG carrier cargo tank according to claim 1, characterized in that, There are multiple first mounting holes, which are distributed at intervals along the circumference of the first cover plate. The positions and numbers of the second mounting holes correspond one-to-one with the positions and numbers of the first mounting holes.

3. The manhole passage structure for the LNG carrier cargo tank according to claim 1, characterized in that, A flange gasket is also provided between the first cover plate and the manhole flange.

4. The manhole passage structure for the LNG carrier cargo tank according to claim 1, characterized in that, The second cover plate is rotatably mounted on the first cover plate via a hinge.

5. The manhole passage structure for the LNG carrier cargo tank according to claim 1, characterized in that, The second cover plate has a flange on the side facing the personnel entrance / exit, and the flange is arranged circumferentially around the bottom wall of the second cover plate; when the second cover plate is placed on the personnel entrance / exit, the flange is in contact with the outer wall of the personnel entrance / exit.

6. The manhole passage structure for the LNG carrier cargo tank according to claim 1, characterized in that, A manhole ladder is provided on the outer side of the first cover plate.

7. The manhole passage structure for the LNG carrier cargo tank according to claim 1, characterized in that, The first cover plate is provided with multiple lifting rings, which are distributed at intervals along the circumference of the first cover plate.

8. A method for installing a manhole access structure for an LNG carrier's cargo tank, based on the manhole access structure for an LNG carrier's cargo tank according to any one of claims 1-7, characterized in that, Includes the following steps: Place a flange gasket on the manhole flange and hoist the first cover plate onto the manhole flange; After hoisting the first cover plate into place, fix the first cover plate to the manhole flange. An access ladder is installed at the personnel entrance and exit of the first cover plate, and air ducts, cables and power pipelines are laid through the first cover plate.

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