Liquefied natural gas (LNG) ship header platform liquid cargo collecting tank discharging device

Abstract

The invention discloses an LNG (Liquefied Natural Gas) ship header platform liquid cargo collecting tank discharge device which comprises a fixed flange, a movable flange, a connecting flange and a discharge pipeline, and the fixed flange, the movable flange and the connecting flange are arranged on the discharge pipeline of a collecting tank in a sleeving manner; the discharge pipeline extends into the connecting flange from the lower portion of the connecting flange so as to be in butt joint with the tail end of the discharge pipeline. The movable relief device connected through the flange is installed on the relief pipeline of the liquid cargo collecting tank of the header platform, it is guaranteed that before loading and unloading of an LNG ship are conducted, the relief device is turned to the outboard, it is guaranteed that LNG leaked from the liquid collecting tank can be discharged to the outboard, the relief function is achieved, and during the non-loading and non-unloading period of normal operation of the LNG ship, the relief device is turned to the outboard to be turned to the outboard to be turned to the outboard to be turned to the outboard to be turned to the outboard to be turned to the outboard to be turned to the outboard to be turned to the outboard. The relief device can be turned to the inboard without being detached, and the operation is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to a liquid cargo collecting tank discharging device for an LNG ship manifold platform. Background Art

[0002] During the loading and unloading of LNG on an LNG ship, a liquid cargo collecting tank is provided on the manifold platform during the design and construction of the manifold platform for loading and unloading liquid cargo, which is used to collect a part of the leaked liquid LNG during the loading and unloading of liquid cargo. To ensure the safety of the loading and unloading operation process, the collected liquid LNG needs to be discharged to the outside of the ship. Therefore, a discharging device is required to complete this work. However, according to the requirements, the fixedly installed discharging device should meet industry specifications and cannot exceed the outside of the ship, or a width that meets the requirements of the discharging function should be reserved for the discharging device at the beginning of the LNG ship structure design. However, this greatly increases the cost of ship design and construction. If an independent and detachable temporary discharging device is designed and constructed, it is installed under the collecting tank during the manifold loading and unloading, and manpower and time are required for each installation, which greatly increases the cost during the loading and unloading and increases the loading and unloading time, and the operation is very inconvenient. Summary of the Invention

[0003] In view of this, the present invention provides a liquid cargo collecting tank discharging device for an LNG ship manifold platform. By installing a movable discharging device connected by a flange on the discharging pipeline of the liquid cargo collecting tank of the manifold platform, it is ensured that before the LNG ship loads and unloads goods, the discharging device is turned to the outside of the ship to ensure that the leaked LNG in the collecting tank can be discharged to the outside of the ship, realizing the discharging function. When the LNG ship is operating normally during non-loading and unloading periods, the discharging device can be turned to the inside of the ship without being disassembled, and the operation is simple and convenient.

[0004] A liquid cargo collecting tank discharging device for an LNG ship manifold platform includes a fixed flange, a movable flange, a connecting flange, and a discharge pipeline. The fixed flange, the movable flange, and the connecting flange are all sleeved on the discharging pipeline of the collecting tank. The fixed flange is welded and fixed to the discharging pipeline of the collecting tank. The movable flange is movably arranged above the fixed flange and the two can rotate relative to each other in the circumferential direction. The connecting flange is arranged below the fixed flange and is connected to the movable flange by fastening bolts. The discharge pipeline extends into the inside of the connecting flange from below the connecting flange to be butt-jointed with the end of the discharge pipeline, and the discharge pipeline is welded and fixed to the connecting flange. When the LNG ship loads and unloads goods, the discharge pipeline is rotated to the outside of the ship to discharge the leaked LNG collected in the collecting tank; when the LNG ship is sailing normally, the discharge pipeline is rotated to the inside of the ship.

[0005] Preferably, a ring-shaped shoulder extends downward from the bottom of the movable flange, and a ring-shaped groove for the ring-shaped shoulder to be inserted into is provided on the upper surface of the fixed flange.

[0006] Preferably, the clearance between the matching position of the annular boss and the annular groove is 2±0.5 mm.

[0007] Preferably, a groove is provided at the center of the bottom of the fixing flange to facilitate welding and fixing the fixing flange to the discharge pipeline of the liquid collecting tank.

[0008] Preferably, the opening diameter in the center of the movable flange is larger than the outer diameter of the discharge pipeline of the sump.

[0009] Preferably, the connecting flange comprises a flange plate and a connecting sleeve fixed to the flange plate, and the discharge pipeline extends into the connecting sleeve and is welded and fixed to the connecting sleeve.

[0010] Preferably, the discharge pipeline includes a vertical straight pipe section connected to the end of the discharge pipeline, a horizontal straight pipe section connected to the vertical straight pipe section through a first 90° elbow joint, and a second 90° elbow joint arranged in the horizontal straight pipe section, and a reducing discharge joint is installed at the end of the second 90° elbow joint and the reducing discharge joint is vertically downward.

[0011] Preferably, the fixed flange, movable flange, connecting flange and discharge pipeline are all made of 316L low-temperature stainless steel.

[0012] The beneficial effects of the present invention are:

[0013] 1. The present invention installs a movable discharge device connected by a flange on the discharge pipeline of the liquid cargo collecting tank of the manifold platform to ensure that the discharge device is turned overboard before the LNG ship loads and unloads cargo, so as to ensure that the LNG leaked in the collecting tank can be discharged overboard to achieve the discharge function. When the LNG ship is operating normally but not during loading and unloading, the discharge device can be turned inboard without being disassembled, and the operation is simple and convenient.

[0014] 2. The movable discharge device of the present invention not only meets the industry standards, but also the entire device does not exceed the side width. During the normal navigation of the LNG ship, it can be turned inboard to discharge the leaked LNG, turned outboard when needed, and turned back inboard when not needed. The operation is more convenient and does not take up extra space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the movable discharge device of the present invention.

[0017] Figure 2 It is a sectional view of the fixed flange.

[0018] Figure 3 It is a sectional view of the connecting flange.

[0019] Figure 4 It is a schematic structural diagram of the discharge pipeline.

[0020] Figure 5 It is an enlarged view of the connection of the fixed flange, movable flange, connecting flange and discharge pipeline.

[0021] The meanings of the reference numerals in the figure are as follows:

[0022] 1 is the movable flange; 11 is the annular shoulder;

[0023] 2 is the fixed flange; 21 is the annular groove; 22 is the recess;

[0024] 3 is the connecting flange; 31 is the flange plate; 32 is the connecting sleeve;

[0025] 4 is the discharge pipeline; 41 is the vertical straight pipe section; 42 is the first 90° elbow joint; 43 is the horizontal straight pipe section; 44 is the second 90° elbow joint; 45 is the reducing discharge joint;

[0026] 5 is the relief pipeline;

[0027] 6 is the fastening bolt. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0029] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the" and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0030] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.

[0031] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two components. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0033] The present invention provides a liquid cargo collecting tank discharging device for an LNG ship manifold platform, which includes a fixed flange 2, a movable flange 1, a connecting flange 3, and a discharge pipeline 4. The fixed flange 2, the movable flange 1, and the connecting flange 3 are all sleeved on the discharge pipeline 5 of the collecting tank. The fixed flange 2 is fixedly welded to the discharge pipeline 5 of the collecting tank. The movable flange 1 is movably arranged above the fixed flange 2 and the two can rotate relative to each other in the circumferential direction. The connecting flange 3 is arranged below the fixed flange 2 and is connected to the movable flange 1 through fastening bolts 6. The discharge pipeline 4 extends into the inside of the connecting flange 3 from below the connecting flange 3 to be butt-jointed with the end of the discharge pipeline 4, and the discharge pipeline 4 is fixedly welded to the connecting flange 3.

[0034] Specifically, a ring-shaped shoulder 11 extends downward from the bottom of the movable flange 1. A ring-shaped groove 21 for the ring-shaped shoulder 11 to be inserted into is provided on the upper surface of the fixed flange 2. The clearance between the mating positions of the ring-shaped shoulder 11 and the ring-shaped groove 21 is 2 ± 0.5 mm.

[0035] A groove 22 is also provided at the center of the bottom of the fixed flange 2 to facilitate welding the fixed flange 2 and the discharge pipeline 5 of the collecting tank into one body. The aperture of the hole in the center of the movable flange 1 is larger than the outer diameter of the discharge pipeline 5 of the collecting tank. The aperture of the hole in the center of the fixed flange 2 matches the outer diameter of the discharge pipeline 5 of the collecting tank. When the movable flange 1 and the fixed flange 2 are sleeved on the discharge pipeline 5, the welding wire can be passed through the hole in the center of the movable flange 1 to weld the upper end face of the fixed flange 2 to the discharge pipeline 5, and the welding wire can be passed through the groove 22 to weld the lower end face of the fixed flange 2 to the discharge pipeline 5.

[0036] The connecting flange 3 includes a flange plate 31 and a connecting sleeve 32 fixed to the flange plate 31. The discharge pipeline 4 extends into the connecting sleeve 32 and is welded and fixed to the connecting sleeve 32. The wall thickness of the connecting sleeve 32 is not less than the wall thickness of the discharge pipeline 5, which is generally 3.05 mm.

[0037] The discharge pipeline 4 includes a vertical straight pipe section 41 connected to the end of the discharge pipeline 4, a horizontal straight pipe section 43 connected to the vertical straight pipe section 41 through a first 90° elbow joint 42, and a second 90° elbow joint 44 arranged in the horizontal straight pipe section 43, and a reducing discharge joint 45 is installed at the end of the second 90° elbow joint 44 and the reducing discharge joint 45 is vertically downward.

[0038] The wall thickness of the vertical straight pipe section 41, the first 90° elbow joint 42, the horizontal straight pipe section 43 and the second 90° elbow joint 44 is not less than the wall thickness of the discharge pipe 5, which is generally 3.05 mm. The wall thickness of one end of the large-size interface of the reducing discharge joint 45 is not less than the wall thickness of the discharge pipe 5, which is generally 3.05 mm, and the wall thickness of the small-size interface at the other end can be less than the wall thickness of the discharge pipe 5, but cannot be less than 2.77 mm.

[0039] The fixed flange 2, the movable flange 1, the connecting flange 3 and the discharge pipeline 4 are all made of 316L low-temperature stainless steel.

[0040] When the discharge pipeline 4 is rotated, since the discharge pipeline 4 and the connecting flange 3 are welded and fixed as a whole, the connecting flange 3 can rotate with the connecting flange 3, and the connecting flange 3 drives the movable flange 1 to make its annular boss 11 slide in the annular groove 21 to achieve synchronous rotation, thereby turning the discharge pipeline 4 to the outside of the ship to discharge the leaked LNG collected in the collecting tank.

[0041] The present invention installs a movable discharge device connected by a flange on the discharge pipeline of the liquid cargo collecting tank of the manifold platform to ensure that the discharge device is turned overboard before the LNG ship loads and unloads cargo, so as to ensure that the LNG leaked in the collecting tank can be discharged overboard to achieve the discharge function; when the LNG ship is operating normally but not loading and unloading cargo, the discharge device can be turned inboard without being disassembled, and the operation is simple and convenient.

[0042] It should be clear that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A liquid cargo collecting tank discharge device for a LNG ship manifold platform, characterized in that: The invention comprises a fixed flange (2), a movable flange (1), a connecting flange (3) and a discharge pipeline (4), wherein the fixed flange (2), the movable flange (1) and the connecting flange (3) are all sleeved on the discharge pipeline (5) of the sump, the fixed flange (2) and the discharge pipeline (5) of the sump are fixed by welding, the movable flange (1) is movably arranged above the fixed flange (2) and the two can realize relative rotation in the circumferential direction, the connecting flange (3) is arranged below the fixed flange (2) and is connected to the movable flange (1) by fastening bolts (6), the discharge pipeline (4) extends from the bottom of the connecting flange (3) into the interior of the connecting flange (3) to be connected with the end of the discharge pipeline (4), and the discharge pipeline (4) and the connecting flange (3) are fixed by welding, and before the LNG ship is loaded or unloaded, the discharge pipeline (4) is rotated to the outside to discharge the leaked LNG collected in the sump; when the LNG ship is in normal navigation, the discharge pipeline (4) is rotated to the inside of the sump.

2. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 1 is characterized in that: An annular boss (11) extends downward from the bottom of the movable flange (1), and an annular groove (21) for the annular boss (11) to be inserted is provided on the upper surface of the fixed flange (2).

3. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 2 is characterized in that: The clearance between the matching position of the annular boss (11) and the annular groove (21) is 2±0.5 mm.

4. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 2 is characterized in that: The center of the bottom of the fixed flange (2) is also provided with a groove (22) for facilitating welding and fixing the fixed flange (2) to the discharge pipeline (5) of the liquid collecting tank.

5. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 1 or 2, characterized in that: The diameter of the opening in the center of the movable flange (1) is larger than the outer diameter of the discharge pipeline (5) of the liquid collecting tank.

6. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 1, characterized in that: The connecting flange (3) comprises a flange plate (31) and a connecting sleeve (32) fixed to the flange plate (31); the discharge pipeline (4) extends into the connecting sleeve (32) and is fixed to the connecting sleeve (32) by welding.

7. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 1 is characterized in that: The discharge pipeline (4) comprises a vertical straight pipe section (41) connected to the end of the discharge pipeline (4), a horizontal straight pipe section (43) connected to the vertical straight pipe section (41) via a first 90° elbow joint (42), and a second 90° elbow joint (44) arranged on the horizontal straight pipe section (43), wherein a reducing discharge joint (45) is installed at the end of the second 90° elbow joint (44), and the reducing discharge joint (45) is vertically downward.

8. The LNG ship manifold platform liquid cargo collecting tank discharge device according to claim 1, characterized in that: The fixed flange (2), the movable flange (1), the connecting flange (3) and the discharge pipeline (4) are all made of 316L low-temperature stainless steel.

Images