Novel LNG (Liquefied Natural Gas) ship isolation void tank sewage pipeline
The inverted U-shaped bend structure and the top suction drainage system solved the problem of liquid accumulation and corrosion in the sewage wells of the LNG ship's isolation compartment, enabling efficient maintenance without hot work and improving ship safety and operational efficiency.
Patent Information
- Application Number
- CN202423133683.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-19
AI Technical Summary
The existing design of sewage discharge pipes in the isolation compartments of LNG ships is prone to liquid accumulation and corrosion, leading to leakage, which affects ship safety and makes operation and maintenance difficult.
A novel sewage pipeline for isolating empty compartments of LNG ships is designed, employing an inverted U-shaped bend structure. Combined with a suction filter, a right-angle check valve, and a remote-controlled butterfly valve, it forms an upward suction drainage system to prevent sewage retention and backflow, simplifying maintenance.
It effectively prevents pipe corrosion, reduces residue blockage, lowers maintenance costs, ensures the system requires no hot work maintenance throughout its entire life cycle, and improves design quality and safety.
Smart Images
Figure CN223631735U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of offshore ship design and construction, and particularly relates to a new type of LNG ship isolation air cabin sewage pipeline. BACKGROUND
[0002] LNG transport ship is a ship specially transporting liquefied natural gas, is a "super refrigeration vehicle on the sea" carrying LNG of minus 163 degrees Celsius, and is praised as the "crown of the shipbuilding industry". Due to the particularity of the LNG transport ship, the safety and sealing requirements are extremely high, so the pipeline system and equipment design and construction have higher requirements. The isolation air cabin is a partition cabin between the front and rear liquid tanks of the LNG ship, and its main function is to put out fire, prevent explosion and prevent leakage. A sewage well and a sewage discharge pipeline are arranged at the tail of the isolation air cabin, the design requirements of the sewage discharge pipeline are higher than those of the conventional ship, the tightness and the durability of the pipeline need to be considered, and the corrosion needs to be reduced, so that the design and construction difficulty is increased. In order to solve this practical problem, a new type of sewage pipeline discharge structure reducing corrosion is designed.
[0003] The sewage well discharge pipeline of the conventional design LNG isolation air cabin is arranged at the bottom of the sewage well of the isolation air cabin, that is, the discharge pipe is arranged in a lower leakage mode. This design is easy to drop into the pipeline and has accumulated liquid in the pipeline during the shipbuilding and later operation, and it is not convenient to clean and maintain after a long time, the pipeline is easy to corrode, and leakage is caused. It has a great influence on the normal operation of the ship and has a certain safety risk. SUMMARY
[0004] To solve the above problems, the present application provides a new type of LNG ship isolation air cabin sewage pipeline, which adopts the technical scheme of:
[0005] A new type of LNG ship isolation air cabin sewage pipeline, a sewage well of the isolation air cabin is arranged below the isolation air cabin, a discharge pipe extends into the sewage well of the isolation air cabin, a suction filter screen is fixed at the bottom end of the discharge pipe, the suction filter screen is of a split type and is installed at the lower end of the suction pipe through a clamp, the top end of the discharge pipe extends and bends upward, penetrates the inner bottom plate of the isolation air cabin into the pipe tunnel cabin, and is merged into the bottom water main of the pipe tunnel cabin.
[0006] A right-angle check valve is arranged at the position where the discharge pipe extends out of the top plate of the sewage well of the isolation air cabin, a cabin access plate is arranged at the position where the inner bottom plate of the isolation air cabin is penetrated by the discharge pipe, and a remote control butterfly valve is arranged in the discharge pipe before the discharge pipe merges into the bottom water main of the pipe tunnel cabin.
[0007] The new type of LNG ship isolation air cabin sewage pipeline is further provided with a right-angle check valve arranged at the right-angle bending position of the discharge pipe.
[0008] The novel LNG ship isolation cabin sewage pipeline further has the following characteristics: the right-angle check valve is 200 mm away from the top plate of the isolation cabin sewage well.
[0009] The novel LNG ship isolation cabin sewage pipeline further has the following characteristics: the opening diameter of the isolation cabin top plate where the discharge pipe is located is 180 mm.
[0010] The novel LNG ship isolation cabin sewage pipeline further has the following characteristics: the suction filter screen is located at the bottom of the isolation cabin sewage well.
[0011] With the structure of the present application, the discharge pipes of the isolation cabin sewage well all adopt the upper suction type, forming a pipe structure with a reverse U-shaped bend, and the sewage is discharged in this way, so that the pipe does not store sewage after the sewage is discharged, and the corrosion risk problem caused by the stored sewage to the pipe is solved, and the upper suction type pipe structure effectively solves the problem that the previous lower suction discharge method is easy to enter residual slag and be blocked, fully considers the later maintenance and maintenance, improves the design quality, ensures that the pipe system does not need to be repaired by fire during the whole life cycle, and reduces the operating cost of the ship. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 is a structural schematic diagram of the present application;
[0013] Figure 2 is a position schematic diagram of the isolation cabin, the isolation cabin sewage well and the pipe tunnel cabin;
[0014] Among them, 1 is a suction filter screen, 2 is a discharge pipe, 3 is a right-angle check valve, 4 is a remote control butterfly valve, 5 is a cabin through plate, 6 is a pipe tunnel cabin bottom water main, D is a bottom pipe tunnel cabin, F is an isolation cabin, and H is an isolation cabin sewage well. DETAILED DESCRIPTION
[0015] The present application is further described in combination with the drawings.
[0016] A novel LNG ship isolation cabin sewage pipeline, as shown in Figure 1 , 2 A novel LNG ship isolation cabin sewage pipeline, as shown in
[0017] A right-angle check valve is arranged at the position where the discharge pipe extends out of the top plate of the isolation cabin sewage well, a cabin through plate is arranged at the position where the discharge pipe penetrates the inner bottom plate of the isolation cabin, and a remote control butterfly valve is arranged in the pipe tunnel cabin before the discharge pipe converges into the pipe tunnel cabin bottom water main.
[0018] The suction filter screen is a split type suction filter screen, which is clamped on the lower end of the suction pipe and placed on the bottom plate of the sewage well, so that installation and maintenance are facilitated; the opening diameter of the top plate of the isolation air chamber where the discharge pipe is located is 180mm; the right-angle check valve is arranged at 200mm above the top plate of the sewage well; the right-angle check valve can effectively prevent sewage from flowing back due to pressure; the outlet end of the right-angle check valve forms an inverted water trap; the 1 water trap pipeline penetrates the bottom plate in the isolation air chamber to the bottom pipe tunnel chamber; the discharge pipe is provided with a remote control butterfly valve before the discharge pipe is merged into the bottom water main of the pipe tunnel chamber; flange connection is adopted for connecting the pipeline and the remote control butterfly valve.
[0019] When the present application is used, the sewage discharge of the isolation air chamber is discharged through the upper suction pipeline; the medium is filtered through the suction filter screen and then enters the discharge pipe; the medium is discharged to the bottom water main of the pipe tunnel chamber through the inverted U-shaped bend formed by the right-angle check valve and the pipeline, and is controlled by the remote control butterfly valve.
[0020] When the present application is used, no medium is stored in the discharge pipeline of the entire isolation air chamber sewage well.
Claims
1. A novel sewage pipeline for isolating empty compartments of LNG ships, characterized in that, Below the isolation chamber is a sewage well for the isolation chamber. The discharge pipe extends into the sewage well for the isolation chamber. A suction filter is fixed at the bottom of the discharge pipe. The suction filter is a split type and is installed at the lower end of the suction pipe by a clamp. After the top of the discharge pipe extends upward and bends, it penetrates the bottom plate of the isolation chamber and enters the pipe tunnel chamber, where it flows into the bottom water main of the pipe tunnel chamber. A right-angle check valve is installed where the discharge pipe extends out of the top plate of the sewage well in the isolation chamber. A passage plate is installed where the discharge pipe penetrates the bottom plate of the isolation chamber. A remote-controlled butterfly valve is installed inside the pipe tunnel chamber and before it merges into the bottom water main of the pipe tunnel chamber.
2. A novel LNG ship isolation chamber sewage pipeline according to claim 1, characterized in that, The right-angle check valve is installed at the right-angle bend of the discharge pipe.
3. A novel LNG ship isolation chamber sewage pipeline according to claim 1, characterized in that, The right-angle check valve is 200mm away from the top plate of the sewage well in the isolation chamber.
4. A novel LNG ship isolation chamber sewage pipeline according to claim 1, characterized in that, The diameter of the opening in the top plate of the isolation chamber where the discharge pipe is located is 180mm.
5. A novel LNG ship wastewater isolation compartment pipeline according to claim 1, characterized in that, The suction filter is located at the bottom of the sewage well in the isolated chamber.