CN117848622A - Installation and airtightness detection method for liquid cargo pipe of LNG ship - Google Patents
Installation and airtightness detection method for liquid cargo pipe of LNG ship Download PDFInfo
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- CN117848622A CN117848622A CN202311733057.8A CN202311733057A CN117848622A CN 117848622 A CN117848622 A CN 117848622A CN 202311733057 A CN202311733057 A CN 202311733057A CN 117848622 A CN117848622 A CN 117848622A
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- liquid cargo
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- tightness
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- 239000007788 liquid Substances 0.000 title claims abstract description 174
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 238000009434 installation Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000003466 welding Methods 0.000 claims abstract description 20
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 7
- 239000003949 liquefied natural gas Substances 0.000 description 37
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 108010066057 cabin-1 Proteins 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a method for installing and verifying tightness of a liquid cargo pipe of an LNG ship, which comprises the following steps: welding all the first liquid cargo pipes to obtain a first liquid cargo main pipe; installing a first fitting and a temporary bracket; the temporary support is used for supporting the first liquid cargo main pipe; installing a cap at each opening of the first liquid cargo header; filling detection gas into the first liquid cargo main pipe to raise the pressure inside the first liquid cargo main pipe to a preset pressure, and performing air tightness test; wherein the step of air tightness inspection is performed before the pump tower is installed. Compared with the prior liquid cargo pipeline air tightness detection process, the air tightness test of the liquid cargo main pipe can be completed under the condition that the cargo tank pump tower is not hoisted, the influence of the pump tower hoisting on the liquid cargo pipeline installation air tightness and the installation period of each low-temperature insulating pipeline is reduced, the liquid cargo pipeline installation air tightness and the low-temperature insulating pipeline installation period are shortened, and the construction cost is saved.
Description
Technical Field
The invention belongs to the technical field of ship construction, and particularly relates to a method for installing a liquid cargo pipe and checking tightness of an LNG ship.
Background
LNG ships (Liquefied Natural Gas, LNG carriers) are known as "bright beads on crowns" in shipbuilding industry, and ultra-low temperature cargo handling systems have been the main building focus and difficulty. The LNG ship generally has four cargo tanks, and a cargo main pump, a sweeping pump, a gas pump, and the like for cargo loading and unloading and transfer are integrated into a pump tower installed in the cargo tanks. A large number of low-temperature insulating pipe systems are distributed on the dome deck of the LNG ship, wherein a liquid cargo main pipe is a longitudinal pipeline used for filling and discharging the liquid cargo tank, penetrates through the bow and the stern of the dome deck and is connected with a cargo tank pump tower through a liquid dome area pipeline.
When installing each pipeline of LNG ship, install liquid cargo pipe earlier in general, then carry out the gas tightness test to liquid cargo pipe, install the low temperature insulation on pipeline after liquid cargo pipe seals well again, however in conventional practice, the gas tightness test of liquid cargo pipe is gone on after the pump tower is installed, and the gas tightness test of liquid cargo pipe just so receives the restriction of pump tower installation cycle, and then the low temperature installation on other pipelines has also received the restriction. In addition, once the pump tower is installed, if the tightness of the liquid cargo pipe is not strict when the air tightness test of the liquid cargo pipe is performed, this may result in reworking, increasing the manufacturing cycle of the LNG ship.
Therefore, in order to reduce the influence of the pump tower crane assembly on the subsequent installation and debugging work and shorten the installation period of the liquid cargo pipe air tightness detection and other low-temperature insulation pipelines, the invention provides a novel method for installing the liquid cargo pipe and checking the air tightness of the LNG ship, which is a technical problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the invention provides a method for installing and verifying the tightness of a liquid cargo pipe of an LNG ship, the LNG ship comprises a pump tower, the liquid cargo pipe comprises at least one first liquid cargo pipe which is not connected with the pump tower and at least one second liquid cargo pipe which is connected with the pump tower, and the method for installing and verifying the tightness of the liquid cargo pipe of the LNG ship comprises the following steps: welding all the first liquid cargo pipes to obtain a first liquid cargo main pipe; installing a first fitting and a temporary bracket; the temporary support is used for supporting the first liquid cargo main pipe; installing a cap at each opening of the first liquid cargo header; filling detection gas into the first liquid cargo main pipe to raise the pressure inside the first liquid cargo main pipe to a preset pressure, and performing air tightness test; wherein the step of air tightness inspection is performed before the pump tower is installed.
In some embodiments, optionally, after the step of performing the air tightness test, the method for installing and air tightness testing the liquid cargo pipe of the LNG ship further includes: installing all second liquid cargo pipes; installing a second fitting, wherein the second fitting is a fitting installed on a second liquid cargo pipe; and installing a pump tower.
In some embodiments, optionally, the method for installing and verifying tightness of the liquid cargo pipe of the LNG ship further includes: separate tightness tests were performed for each first liquid-cargo tube and each second liquid-cargo tube.
In some embodiments, optionally, the first fitting and the second fitting each comprise at least one of the following: isolation valve, relief valve, ball valve, stop valve, check valve, governing valve, pressure sensor, shutoff.
In some embodiments, optionally, after the step of welding all the first liquid cargo pipes, the method for installing and verifying tightness of the liquid cargo pipes of the LNG ship further includes: and carrying out flaw detection treatment on all welding seams.
In some embodiments, optionally, after the step of performing the air tightness test, the method for installing and air tightness testing the liquid cargo pipe of the LNG ship further includes: and determining a safe exhaust point, and exhausting the detection gas in the first liquid cargo main pipe.
In some embodiments, optionally, before the step of filling the first cargo header with the detection gas, the method for installing and verifying tightness of the cargo tank of the LNG ship further includes: the first liquid cargo header is purged.
In some aspects, optionally, the cap comprises a stainless steel cap.
In some embodiments, optionally, the detection gas comprises nitrogen or argon.
In some embodiments, optionally, the preset pressure is 1.5MPa.
The beneficial effects brought by the invention are as follows:
(1) The influence of pump tower hoisting on the installation tightness of the liquid cargo pipe and the installation period of each low-temperature insulating pipeline is reduced;
(2) The installation and airtightness test period of the liquid cargo pipe and the installation period of each low-temperature insulating pipeline are shortened, and the production and construction costs are saved.
Drawings
Fig. 1 shows one of schematic flowcharts of a method of installing and air tightness checking a liquid cargo pipe of an LNG ship according to an embodiment of the present invention;
fig. 2 shows a second schematic flow chart of a method for installing and verifying tightness of a liquid cargo pipe of an LNG ship according to an embodiment of the present invention;
fig. 3 shows a third schematic flow chart of a method for installing and verifying tightness of a liquid cargo pipe of an LNG ship according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of an LNG ship according to the present invention;
fig. 5 is a schematic perspective view of a liquid cargo pipe in the liquid dome area of an LNG ship according to the present invention;
fig. 6 is a schematic view of a stainless steel butt welding pipe cap structure according to the present invention.
Wherein, the correspondence between the reference numerals and the component names in fig. 4 to 6 is:
the cargo tank comprises a cargo tank 1, a first liquid cargo main pipe 2, a first port 21, a second port 22, a 3 isolation valve, a second liquid cargo main pipe 4 and a 5 stainless steel butt welding pipe cap.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present embodiment provides a method of installing and air tightness checking a liquid cargo pipe of an LNG ship, the LNG ship including a pump tower, the liquid cargo pipe including at least one first liquid cargo pipe unconnected to the pump tower and at least one second liquid cargo pipe connected to the pump tower, the method of installing and air tightness checking a liquid cargo pipe of the LNG ship comprising the steps of:
s102: welding all the first liquid cargo pipes to obtain a first liquid cargo main pipe;
s104: installing a first fitting and a temporary bracket; the temporary support is used for supporting the first liquid cargo main pipe;
s106: installing a cap at each opening of the first liquid cargo header;
s108: filling detection gas into the first liquid cargo main pipe to raise the pressure inside the first liquid cargo main pipe to a preset pressure, and performing air tightness test; wherein the step of air tightness inspection is performed before the pump tower is installed.
According to the method for installing and verifying the tightness of the liquid cargo pipe of the LNG ship, the tightness test of the liquid cargo main pipe can be completed under the condition that the cargo tank pump tower is not hoisted, the tightness detection of the liquid cargo pipe and the installation period of other low-temperature insulation pipelines are shortened, and the construction cost is saved. It will be appreciated that LNG ship cargo holds are longitudinal lines for cargo tank injection and discharge, extending through the dome deck heads and tails, and pump towers are mounted within the LNG ship cargo tanks for cargo injection and discharge. The liquid cargo header pipe is communicated with the pump tower through a liquid dome area pipeline. In the construction process at the present stage, after the pump tower is lifted and the pipeline in the liquid dome area is installed, the liquid cargo main pipe and the pipeline in the liquid dome area are sealed together, so that the whole air tightness is checked once, and multiple air tightness checks are not needed, but the defect is that once the situation of poor air tightness exists, the pump tower is also needed to be disassembled, so that the production progress is greatly reduced.
In some embodiments, optionally, after the step of performing the air tightness test, the method of installing and air tightness testing the liquid cargo tanks of the LNG ship further comprises: installing all second liquid cargo pipes; installing a second fitting, wherein the second fitting is a fitting installed on a second liquid cargo pipe; and installing a pump tower.
In this embodiment, after the air tightness test is performed on the first liquid cargo main pipe, all the second liquid cargo pipes, the second fittings and the pump tower are installed, so that the installation of the whole liquid cargo pipe and the pump tower can be completed, the installation efficiency is improved, and the manufacturing cost is reduced.
In some embodiments, optionally, the installation and tightness checking method of the liquid cargo pipe of the LNG ship further comprises: separate tightness tests were performed for each first liquid-cargo tube and each second liquid-cargo tube.
In this embodiment, after the second liquid cargo pipes, the second fittings, and the pump tower are installed, separate air tightness detection is performed for each first liquid cargo pipe and each second liquid cargo pipe, so that it is possible to ensure that the entire liquid cargo pipe has good air tightness, and to avoid air leakage.
In some embodiments, optionally, the first fitting and the second fitting each comprise at least one of the following: isolation valve, relief valve, ball valve, stop valve, check valve, governing valve, pressure sensor, shutoff.
In some embodiments, optionally, after the step of welding all the first liquid cargo pipes, the method of installing and air tightness checking liquid cargo pipes of the LNG ship further includes: and carrying out flaw detection treatment on all welding seams.
In this embodiment, after the step of welding all the first liquid cargo pipes, flaw detection treatment is performed on all the welds, so that it is possible to improve the air tightness between the first liquid cargo pipes and to improve the manufacturing efficiency.
In some embodiments, optionally, after the step of performing the air tightness test, the method of installing and air tightness testing the liquid cargo tanks of the LNG ship further comprises: and determining a safe exhaust point, and exhausting the detection gas in the first liquid cargo main pipe.
In this embodiment, after the step of performing the air tightness test, a safe exhaust point is determined, and the detection gas inside the first liquid cargo main pipe is exhausted, so that the safety of the first liquid cargo main pipe can be improved, and the safety of staff is ensured.
In some embodiments, optionally, before the step of filling the first cargo header with the test gas, the method of installing and air tightness testing the cargo tanks of the LNG ship further comprises: the first liquid cargo header is purged.
In this embodiment, the first liquid cargo header is purged prior to the step of performing the air tightness test, so that an unsuccessful air tightness test due to a blockage in the first liquid cargo header can be avoided.
In some embodiments, optionally, the cap comprises a stainless steel cap.
In some embodiments, optionally, the detection gas comprises nitrogen or argon.
In some embodiments, optionally, the preset pressure is 1.5MPa.
As shown in fig. 2, the present embodiment provides another method for installing and airtightness inspection of a liquid cargo pipe of an LNG ship, including the steps of:
s202: welding all butt welds of a longitudinal first liquid cargo main pipe of a dome deck and accessories thereof, performing flaw detection, and cleaning a dirty pipe section after flaw detection is finished;
wherein, the liquid dome area is only provided with a liquid cargo main pipe to which a single cabin isolating valve belongs, and a plurality of other pipes which are directly connected with the pump tower after the single cabin isolating valve are not arranged at first;
s204: a stainless steel butt welding pipe cap is arranged at the opening of the first liquid cargo main pipe, or channel steel is welded on the deck surface to surround the opening of the first liquid cargo main pipe, so that the opening is used for diversion protection during accidental leakage and high-pressure airflow impact is prevented;
s206: a blind flange is arranged at the forefront end of the first liquid cargo main pipe, and a single-cabin isolation valve of each cargo cabin is closed;
s208: selecting a proper interface on a pipe section needing air tightness test, accessing a nitrogen cylinder group, filling nitrogen into a first liquid cargo main pipe, boosting the pressure to a specified pressure, and carrying out air tightness test;
s210: after the tightness test is finished, a safe exhaust point is selected to exhaust the detection gas in the first liquid cargo main pipe.
As shown in fig. 4, taking an LNG ship including 1 cargo hold 1 as an example, the LNG ship includes a cargo hold 1, a first cargo main 2, a isolation valve 3, a second cargo main 4, and a second cargo pipe valve assembly, the first cargo main 2 is composed of a plurality of first liquid cargo pipes, the second cargo main 4 is composed of a plurality of second liquid cargo pipes, the second liquid cargo pipe valve assembly includes seven valve bodies of V2, V3, V4, V5, V6, V7, V8, etc., during the installation and airtightness test of the liquid cargo pipes, the first liquid cargo main 2 is installed first, the second liquid cargo main 4 connected to the pump tower in the cargo hold 1 and the valve bodies of the second liquid cargo pipe valve assemblies V2, V3, V4, V5, V6, V7, V8, etc. are not installed first, after the first liquid cargo main 2 is installed, the second liquid cargo pipe 4 and the second liquid cargo pipe valve assembly are installed, and finally, after the first liquid cargo pipe 2 and each second liquid cargo pipe are inspected separately for airtightness.
When the air tightness of the first liquid cargo main pipe 2 is detected, as shown in fig. 5, the first liquid cargo main pipe 2 and accessories are welded, weld joint flaw detection is performed, then a dirty pipe section is cleaned, and then a stainless steel butt welding pipe cap is installed at a first port 21 of the first liquid cargo main pipe 2, wherein the structure of the stainless steel butt welding pipe cap is as shown in fig. 6, or a deck surface is welded with channel steel to surround the first port 21 for diversion protection during accidental leakage and high-pressure air flow impact prevention; and then installing a blind flange at a second port 22 at the forefront end of the first liquid cargo main pipe 2, closing a single-cabin isolating valve 3 of each cargo cabin 1, selecting a proper port on the airtight pipe section to be connected with a nitrogen cylinder group, filling nitrogen into the first liquid cargo main pipe 2, boosting the pressure to a specified pressure, and performing an airtight test.
In order to reduce the influence of pump tower hoisting on subsequent installation and debugging work, shorten the installation period of a liquid cargo pipe, air tightness and a low-temperature insulation pipeline, save the construction cost of a ship, as shown in fig. 3, the embodiment provides a method for detecting the installation and air tightness of the liquid cargo pipe of an LNG ship, which comprises the following steps:
s302: welding a first liquid cargo main pipe, performing flaw detection after welding, and then installing a first accessory and a bracket;
in the step, the cargo hold pump tower is not hoisted firstly, and a bulk pipe (namely a second liquid cargo pipe) directly connected with the pump tower after a single-cabin isolating valve in a liquid dome area is not installed temporarily; the single compartment isolation valve is an isolation valve disposed between the first liquid cargo main and the corresponding cargo compartment.
S304: a temporary support of a first liquid cargo main pipe is arranged in a liquid dome area, and a stainless steel butt welding pipe cap is arranged at an opening of the first liquid cargo main pipe;
s306: closing the single cabin isolation valve;
s308: and selecting a proper pipeline interface, filling nitrogen into the first liquid cargo main pipe, and raising the pressure in the pipeline to perform tightness test.
In some embodiments, optionally, the cargo tank pump tower has not yet been completely hoisted when the first liquid cargo header is subjected to the seal inspection.
In some embodiments, optionally, the piping and valves connected to the pump tower after the single-tank isolation valve in the liquid dome area need not be installed when the first liquid cargo header is subjected to a seal test; that is, the second liquid cargo pipe and the second fitting are temporarily not installed.
In this embodiment, when the tightness of the liquid cargo pipeline in the deck area is detected, the bulk pipeline in the liquid dome area, which is in butt joint with the cargo tank pump tower, is not installed first, the tightness of the first liquid cargo main pipe is detected before the cargo tank pump tower is lifted, after the tightness of the first liquid cargo main pipe is detected, the pump tower and the bulk pipeline in the liquid dome area are installed, and then the individual tightness is carried out for the liquid dome area pipeline of each cargo tank.
Compared with the existing liquid cargo pipeline air tightness detection process, the method can finish the air tightness test of the liquid cargo main pipeline under the condition that the cargo tank pump tower is not hoisted, shortens the installation air tightness of the liquid cargo pipeline and the installation period of the low-temperature insulating pipeline, and saves the construction cost.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method of installing and air tightness testing a liquid cargo pipe of an LNG carrier, the LNG carrier including a pump tower, the liquid cargo pipe including at least one first liquid cargo pipe unconnected to the pump tower and at least one second liquid cargo pipe connected to the pump tower, the method of installing and air tightness testing a liquid cargo pipe of an LNG carrier comprising:
welding all the first liquid cargo pipes to obtain a first liquid cargo main pipe;
installing a first fitting and a temporary bracket; wherein the first fitting is a fitting mounted on the first liquid cargo main pipe, and the temporary support is used for supporting the first liquid cargo main pipe;
installing a cap at each opening of the first liquid cargo header;
filling detection gas into the first liquid cargo main pipe to raise the pressure inside the first liquid cargo main pipe to a preset pressure, and performing air tightness test;
wherein the step of air tightness testing is performed prior to installation of the pump tower.
2. The method for installing and verifying the tightness of the liquid cargo pipe of the LNG ship according to claim 1, wherein after the step of performing the tightness verification, further comprising:
installing all the second liquid cargo pipes;
installing a second fitting, wherein the second fitting is a fitting installed on the second liquid cargo pipe;
and installing a pump tower.
3. The method for installing and verifying the tightness of the liquid cargo pipe of the LNG ship according to claim 2, further comprising: and performing separate air tightness detection on each first liquid cargo pipe and each second liquid cargo pipe.
4. The method of installing and air tightness testing a liquid cargo pipe of an LNG ship according to claim 2, wherein the first fitting and the second fitting each comprise at least one of the following fittings:
isolation valve, relief valve, ball valve, stop valve, check valve, governing valve, pressure sensor, shutoff.
5. The method for installing and verifying the tightness of the liquid cargo tubes of the LNG carrier according to claim 1, wherein after the step of welding all the first liquid cargo tubes, further comprising:
and carrying out flaw detection treatment on all welding seams.
6. The method for installing and verifying the tightness of the liquid cargo pipe of the LNG ship according to claim 1, wherein after the step of performing the tightness verification, further comprising:
and determining a safe exhaust point, and exhausting the detection gas in the first liquid cargo main pipe.
7. The method for installing and verifying the tightness of the liquid cargo pipe of the LNG ship according to claim 1, wherein the step of filling the first liquid cargo header pipe with the detection gas further comprises: and cleaning the first liquid cargo header.
8. Method for installation and tightness inspection of liquid cargo pipes of LNG ships according to any of claims 1-7, characterized in that the pipe cap comprises a stainless steel pipe cap.
9. Method for installation and tightness inspection of liquid cargo pipes of LNG ships according to any of claims 1-7, characterized in that the detection gas comprises nitrogen or argon.
10. Method for installation and tightness inspection of liquid cargo pipes of LNG ships according to any of claims 1-7, characterized in that the preset pressure is 1.5MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311733057.8A CN117848622A (en) | 2023-12-15 | 2023-12-15 | Installation and airtightness detection method for liquid cargo pipe of LNG ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311733057.8A CN117848622A (en) | 2023-12-15 | 2023-12-15 | Installation and airtightness detection method for liquid cargo pipe of LNG ship |
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| Publication Number | Publication Date |
|---|---|
| CN117848622A true CN117848622A (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311733057.8A Pending CN117848622A (en) | 2023-12-15 | 2023-12-15 | Installation and airtightness detection method for liquid cargo pipe of LNG ship |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117848622A (en) |
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2023
- 2023-12-15 CN CN202311733057.8A patent/CN117848622A/en active Pending
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