A low-temperature hatch cover for a B-type liquefied gas hatch of a ship and a method of installation

Abstract

The application discloses a low-temperature hatch cover for a liquefied gas B-type tank of a ship, which comprises a cover plate body, a heat insulation module and a gland, the cover plate body is installed on the top of a dome structure of the B-type tank, the heat insulation module is installed on the cover plate body, the gland is installed above the heat insulation module, the cover plate body is connected and fixed with the top of the dome structure of the B-type tank through bolts around the cover plate body, the middle part of the heat insulation module is connected with the upper end surface of the cover plate body, the two sides of the heat insulation module are connected with the upper end surface of the peripheral insulation layer of the B-type tank, and the gland is connected with the cover plate body through bolts. The heat insulation module is arranged in a stepped mode, so that the hatch cover is convenient to open and close.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of shipbuilding, and particularly relates to a low-temperature hatch cover for a liquefied gas B-type tank on a ship and a mounting method. BACKGROUND

[0002] In recent years, the demand for low-temperature liquefied gas ships, especially liquefied natural gas (LNG) transport ships, very large ethane carrier (VLEC) ships, and dual-fuel container ships is increasing. The liquid cargo tank of a low-temperature liquefied gas ship needs to be provided with sufficient thermal insulation, and the B-type tank type (the internal pressure is generally less than 1 bar) according to the International Maritime Organization (IMO) standard adopts a mounting method in which the thermal insulation layer is wrapped around the outer periphery of the tank, which is different from the internal mounting method of the A-type tank and the membrane type tank. Therefore, the low-temperature hatch cover and the thermal insulation layer need to be considered accordingly to ensure the airtightness and thermal insulation of the hatch cover and to smoothly perform the hatch cover opening and closing operation. SUMMARY

[0003] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a low-temperature hatch cover for a liquefied gas B-type tank on a ship and a mounting method. The present application provides a low-temperature hatch cover for a liquefied gas B-type tank on a ship and a mounting method.

[0004] In order to achieve the above-mentioned purpose of the application, the technical solution provided by the present application is as follows:

[0005] A low-temperature hatch cover for a liquefied gas B-type tank on a ship, comprising a cover plate body, a thermal insulation module, and a gland, wherein the cover plate body is mounted on the top of a B-type tank dome structure, the thermal insulation module is mounted on the cover plate body, and the gland is mounted above the thermal insulation module; the cover plate body is connected and fixed to the top of the B-type tank dome structure through bolts around the periphery of the cover plate body; the middle part of the thermal insulation module is connected to the upper end surface of the cover plate body; the two sides of the thermal insulation module are connected to the upper end surface of the peripheral insulation layer of the B-type tank; and the gland is connected to the cover plate body through bolts.

[0006] Further, a plurality of mounting holes are uniformly arranged around the periphery of the cover plate body, thickened frames are arranged on the upper end surface and the lower end surface of the periphery of the cover plate, the thickened frames are provided with a plurality of through holes, the through holes in the thickened frames are in communication with the mounting holes in a corresponding manner, and a plurality of eye plates are arranged on the end surface of the cover plate body.

[0007] Further, the eye plate arranged on the upper end surface of the cover plate body is a buried eye plate, the upper end surface of the eye plate is flush with the end surface of the cover plate body; a coaming is arranged on the inner side of the thickened frame on the lower end surface of the cover plate, a baffle is arranged on the inner side of the coaming, a reinforcing rib is arranged on the inner side of the baffle, and a sealing ring is arranged between the thickened frame on the lower end of the cover plate and the cover plate body.

[0008] Further, the heat insulation module is square as a whole, the lower end of the heat insulation module is stepped, the width of the heat insulation module overlapped with the upper end of the B-type cabin peripheral insulation layer is greater than the width of the B-type cabin peripheral insulation layer, and the thickness of the heat insulation module at the upper end of the B-type cabin peripheral insulation layer is greater than the width of the B-type cabin peripheral insulation layer.

[0009] Further, the gland is groove-shaped as a whole, the groove of the gland is clamped on the upper end of the heat insulation module, a plurality of eye plates are arranged on the gland, and the gland is connected and fixed with the cover plate body by long studs penetrating through the heat insulation module.

[0010] Further, a waterproof sealing ring is arranged at the stud hole of the mounting stud on the gland.

[0011] A mounting method of a marine liquefied gas B-type cabin cryogenic hatch cover, the method specifically comprises the following steps:

[0012] S1, preparing a marine liquefied gas B-type cabin cryogenic hatch cover, including a cover plate body, a heat insulation module and a gland, the cover plate body is installed on the top of the B-type cabin dome structure, the heat insulation module is installed on the cover plate body, the gland is installed above the heat insulation module, the cover plate body is connected and fixed with the top of the B-type cabin dome structure through bolts around the cover plate body, the heat insulation module is connected with the upper end of the cover plate body in the middle of the heat insulation module, and the heat insulation module is connected with the upper end of the B-type cabin peripheral insulation layer on both sides of the heat insulation module, and the gland is connected with the cover plate body through bolts;

[0013] S2, the cover plate body is hoisted to the top of the B-type cabin dome structure through the embedded eye plate on the cover plate body and is connected and fixed through bolts;

[0014] S3, the heat insulation module is installed on the cover plate body, the gland is installed on the cover plate body, the gland is connected and fixed with the cover plate body through long studs, the heat insulation module is pressed on the cover plate body, and the installation of the B-type cabin cryogenic hatch cover is completed.

[0015] Based on the above technical scheme, the marine liquefied gas B-type cabin cryogenic hatch cover and the mounting method have the following technical advantages after practical application:

[0016] 1. The marine liquefied gas B-type cabin cryogenic hatch cover is provided with the stepped heat insulation module, so that the hatch cover is convenient to open and close.

[0017] 2. The marine liquefied gas B-type cabin cryogenic hatch cover is pressed by the gland, the heat insulation module and the cover plate body are tightly pressed, a continuous and uninterrupted heat insulation layer is formed, and the insulation performance of the B-type cabin cryogenic hatch cover is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a plan view of a cover plate body in a low-temperature hatch cover of a liquefied gas B-type hatch on a ship according to the present application.

[0019] Figure 2 is a plan view of a cover plate body in a low-temperature hatch cover of a liquefied gas B-type hatch on a ship according to the present application. Figure 1 is a schematic view of A-A.

[0020] Figure 3 is a side view of a hatch cover in a low-temperature hatch cover of a liquefied gas B-type hatch on a ship according to the present application. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions, and advantages of the present application clearer, the present application will be described below in detail with reference to the accompanying drawings, but it should be understood that the following description is only exemplary but not intended to limit the scope of the present application. Moreover, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0022] The present application belongs to a low-temperature hatch cover of a liquefied gas B-type hatch on a ship, which comprises a cover plate body 1, a heat insulation module 8, and a gland 9. The cover plate body 1 is installed on the top of a dome structure of the B-type hatch. The heat insulation module 8 is installed on the cover plate body 1. The gland 9 is installed above the heat insulation module 8. The cover plate body 1 is connected and fixed to the top of the dome structure of the B-type hatch through bolts around the cover plate body 1. The middle part of the heat insulation module 8 is connected to the upper end surface of the cover plate body 1. The two sides of the heat insulation module are connected to the upper end surface of the peripheral insulation layer of the B-type hatch. The gland 9 is connected to the cover plate body 1 through bolts.

[0023] The cover plate body 1 is uniformly provided with a plurality of mounting holes around the cover plate body 1. The upper end surface and the lower end surface of the cover plate body 1 are respectively provided with thickened frames 11. The thickened frames 11 are provided with a plurality of through holes. The through holes in the thickened frames 11 are in communication with the mounting holes. The end surface of the cover plate body 1 is provided with a plurality of eye plates 7.

[0024] The eye plate 7 provided on the upper end surface of the cover plate body 1 is a buried eye plate 7. The upper end surface of the eye plate 7 is flush with the end surface of the cover plate body 1. The inside of the thickened frame 11 of the lower end surface of the cover plate body 1 is provided with a coaming 2. The inside of the coaming 2 is provided with a baffle 4. The inside of the baffle 4 is provided with a reinforcing rib 3. A sealing ring is arranged between the thickened frame 11 of the lower end surface of the cover plate body 1 and the cover plate body 1. A plurality of bolt holes are further arranged on the end surface of the cover plate body 1, which are respectively corresponding to the bolt holes on the gland 9. Figures 1-3

[0025]

[0026]

[0027] ​​​The heat insulation module 8 is square as a whole, the lower ends of the heat insulation module 8 are stepped, the width of the heat insulation module 8 overlapped with the upper end of the B-type cabin peripheral insulation layer is greater than the width of the B-type cabin peripheral insulation layer, and the thickness of the heat insulation module 8 at the upper end of the B-type cabin peripheral insulation layer is greater than the width of the B-type cabin peripheral insulation layer; the stepped heat insulation module 8 facilitates the opening and closing operation of the hatch cover.

[0028] The gland 9 is groove-shaped as a whole, the groove of the gland 9 is clamped on the upper end of the heat insulation module 8, a plurality of eye plates 7 are arranged on the gland 9, and the gland 9 is connected and fixed with the cover plate body 1 by penetrating the heat insulation module 8 through long studs; the heat insulation module 8 and the cover plate body 1 are pressed tightly by the gland 9 to form a continuous and uninterrupted heat insulation layer, thereby improving the insulation performance of the B-type cabin cryogenic hatch cover.

[0029] A waterproof sealing ring is arranged at the stud hole of the mounting stud on the gland 9.

[0030] A mounting method of a marine liquefied gas B-type cabin cryogenic hatch cover, which specifically comprises the following steps:

[0031] S1, a marine liquefied gas B-type cabin cryogenic hatch cover is prepared, which comprises a cover plate body 1, a heat insulation module 8 and a gland 9, the cover plate body 1 is installed on the top of a B-type cabin dome structure, the heat insulation module 8 is installed on the cover plate body 1, the gland 9 is installed above the heat insulation module 8, the cover plate body 1 is connected and fixed with the top of the B-type cabin dome structure through bolts around the cover plate body 1, the heat insulation module 8 is connected with the upper end surface of the B-type cabin peripheral insulation layer on the middle part of the ground section of the heat insulation module 8, the heat insulation module 8 is connected with the upper end surface of the B-type cabin peripheral insulation layer on both sides of the heat insulation module 8, and the gland 9 is connected with the cover plate body 1 through bolts;

[0032] S2, the cover plate body 1 is hoisted to the top of the B-type cabin dome structure through the embedded eye plate 7 on the cover plate body 1 and is connected and fixed through bolts;

[0033] S3, the heat insulation module 8 is installed on the cover plate body 1, the gland 9 is installed on the cover plate body 1, the gland 9 is connected and fixed with the cover plate body 1 through long bolts, and the heat insulation module 8 is pressed tightly on the cover plate body 1, thereby completing the installation of the B-type cabin cryogenic hatch cover.

[0034] In the embodiment, when the hatch cover needs to be opened, the stud nut and the waterproof sealing ring on the gland 9 are loosened first, then the gland 9 is hoisted away through the eye plate 7 on the gland 9, the heat insulation module 88 is exposed and detached, the cryogenic hatch cover body is exposed at this time, the bolts around the cover plate body 1 are removed, and finally the cover plate 1 is hoisted open by using the embedded eye plate 7. When the hatch cover is closed, the above steps are reversed.

[0035] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by the equivalent ones without departing from the spirit of the technical solutions of the present application, and all of them should be covered in the technical solution range claimed by the present application.

Claims

1. A marine liquefied gas type B cryogenic tank cover, characterized in that, The device includes a cover plate body, a thermal insulation module, and a pressure cap. The cover plate body is installed on the top of the dome structure of the B-type cabin. The thermal insulation module is installed on the cover plate body. The pressure cap is installed above the thermal insulation module. The cover plate body is connected and fixed to the top of the dome structure of the B-type cabin by bolts around its perimeter. The bottom center of the thermal insulation module is connected to the upper end face of the cover plate body. The two sides of the thermal insulation module are connected to the upper end face of the outer perimeter insulation layer of the B-type cabin. The pressure cap is connected to the cover plate body by long studs. The heat insulation module is square in shape, and the lower two sides of the heat insulation module are stepped. The cover is in the shape of a groove, and the groove of the cover is engaged with the upper end of the heat insulation module. The cover is provided with multiple eye plates, and the cover is connected and fixed to the cover plate body by long studs passing through the heat insulation module.

2. The marine liquefied gas type B cryogenic tank cover according to claim 1, characterized in that, The cover plate body has multiple mounting holes evenly arranged around its perimeter. The upper and lower surfaces of the cover plate body are respectively provided with thickened borders, and the thickened borders are provided with multiple through holes, which are connected to the mounting holes. The upper surface of the cover plate body is provided with multiple eye plates.

3. A marine liquefied gas type B cryogenic tank cover according to claim 2, characterized in that, The eye plate provided on the upper end face of the cover plate body is an embedded eye plate, and the upper end face of the eye plate is flush with the end face of the cover plate body; a surrounding plate is provided on the inner side of the thickened frame on the lower end face of the cover plate, a baffle is provided on the inner side of the surrounding plate, and a reinforcing rib is provided on the inner side of the baffle; a sealing ring is provided between the thickened frame at the lower end of the cover plate and the cover plate body.

4. A marine liquefied gas type B cryogenic tank cover according to claim 1, characterized in that, A waterproof sealing ring is provided at the stud hole of the mounting stud on the gland.

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