CN112611609A - Helium concentration sampling detection method for helium test of sublayer insulating layer of liquid cargo tank of LNG ship - Google Patents
Helium concentration sampling detection method for helium test of sublayer insulating layer of liquid cargo tank of LNG ship Download PDFInfo
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- CN112611609A CN112611609A CN202011404618.6A CN202011404618A CN112611609A CN 112611609 A CN112611609 A CN 112611609A CN 202011404618 A CN202011404618 A CN 202011404618A CN 112611609 A CN112611609 A CN 112611609A
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- 239000001307 helium Substances 0.000 title claims abstract description 71
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 71
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000005070 sampling Methods 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 title claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 229910001374 Invar Inorganic materials 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a helium concentration sampling detection method for a helium test of a sublayer insulation layer of a liquid cargo tank of an LNG ship.
Description
Technical Field
The invention relates to the technical field of ship detection, in particular to a helium concentration sampling detection method for a helium test of a sublayer insulating layer of a liquid cargo tank of an LNG ship.
Background
The liquid cargo tank construction is the most important work in the LNG ship construction process and has the largest difficulty coefficient, the NO96 type containment system mainly comprises a secondary layer insulation box, a secondary layer invar film, a main layer insulation box and a main layer invar film, the secondary layer invar film is installed and welded to form a secondary layer insulation layer with a ship body, zero leakage points are ensured on the secondary layer insulation layer, and except for PT detection after welding, a helium test is an indispensable inspection step. According to the requirements of relevant documents, the helium concentration of the helium test of the sub-layer insulating layer is at least 10%, and the helium concentration is 20% in a common case. However, in the helium test, the sub-layer insulation layer is sealed, so that a sampling hole is required to be formed on the sub-layer invar film for sampling the helium concentration. The traditional helium concentration detection method is difficult to judge whether the helium concentration of the secondary insulating layer meets the GTT file requirement, helium waste is easily caused, and the construction cost is increased.
Disclosure of Invention
In view of the above, the present invention provides a helium concentration sampling detection method for a helium test of a sublayer insulation layer of a cargo tank of an LNG carrier, so as to solve the problems in the background art.
A helium concentration sampling detection method for a helium test of a sublayer insulating layer of a liquid cargo tank of an LNG ship specifically comprises the following steps:
s1, manufacturing a sub-layer invar film, and pre-installing a helium concentration sampling detection device on a sampling hole of the sub-layer invar film in advance after the sub-layer invar film is manufactured;
the helium concentration sampling detection device comprises a sampling base fixed on a sampling hole of a sublayer invar film of the sublayer insulating layer, a two-way valve fixed on the sampling base and a detection nozzle fixed on the two-way valve, wherein the sampling base, the two-way valve body and the detection nozzle form an air flow channel together;
s2, mounting the sub-layer invar film provided with the helium concentration sampling detection device on the ship body to form a sub-layer insulation layer with the ship body;
s3, helium is injected into the sub-layer insulating layer through a gas injection port reserved in the sub-layer insulating layer, after nitrogen is injected, a two-way valve is opened, the helium in the sub-layer insulating layer flows through a sampling cavity, the two-way valve and the gas nozzle and is discharged from the end portion of the gas nozzle, a gas concentration detector is adopted to detect the concentration of the helium flowing out of the end portion of the gas nozzle, if the concentration of the helium reaches 20%, the requirement is met, and if the concentration of the helium does not reach 20%, the helium continues to be injected through the gas injection port of the sub-layer insulating layer.
Preferably, the sampling base comprises a head and a base body, the outer end faces of the head and the base body are provided with external threads, a sampling cavity is arranged inside the head and the base body, and the sampling cavity is communicated with a valve cavity of the two-way valve.
Preferably, the outer end face of the connector is provided with external threads, the connector threads are fixed in a valve opening of the two-way valve, and a first cavity matched with the size of the valve cavity of the two-way valve is arranged in the connector;
a second chamber is arranged in the air faucet;
and a third chamber communicated with the first chamber and the second chamber is arranged in the transition section.
Preferably, the diameter of the second chamber is smaller than the diameter of the first chamber.
Preferably, the third chamber is a conical chamber having one end with the same diameter as the first chamber and the other end with the same diameter as the second chamber.
Preferably, the sampling base is made of stainless steel materials, and the detection nozzle is made of copper materials.
The invention has the beneficial effects that:
this application simple structure, installation convenient to use can detect out the intraformational helium concentration of sublayer insulation fast, accurately through utilizing the device of this application, have improved the experimental detection efficiency and the detection accuracy degree of helium, have also reduced the experimental detection cost of helium simultaneously, have reduced the manufacturing cost of enterprise.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of a sampling base.
Fig. 3 is a schematic structural view of the detection seat.
The reference numerals in the figures have the meaning:
1 is the sample base, and 2 are the bi-pass valve, and 3 are the detection mouth, and 4 are the heads, and 5 are the base body, and 6 are the sample cavity, and 7 are the joint, and 8 are the changeover portion, and 9 are the air cock, and 10 are first cavity, and 11 are the second cavity, and 12 are the third cavity.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected" and "fixed" are used in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a helium concentration sampling detection device for a helium test of a sublayer insulating layer of a cargo tank of an LNG ship, which comprises a sampling base 1, a two-way valve 2 and a detection nozzle 3, wherein an air flow channel is formed in the sampling base 1, the two-way valve 2 and the detection nozzle 3 together.
The sampling base 1 is fixed on the sampling hole of the sublayer invar film of the sublayer insulating layer. The sampling base 1 comprises a head part 4 and a base body 5, and the outer end faces of the head part 4 and the base body 5 are both provided with external threads. The head 4 of the sampling base 1 is fixed on the sampling hole of the sublayer invar film by screw thread, and the base body 5 is fixed on a valve port of the two-way valve 2 by screw thread. The head part 4 and the base body 5 are both internally provided with a sampling cavity 6, and the sampling cavity 6 is communicated with the valve cavity of the two-way valve 2.
The detection nozzle 3 is fixed on the two-way valve 2. The detection nozzle 3 comprises a connector 7, a transition section 8 and an air tap 9 which are sequentially connected into a whole along the gas flowing direction, and the connector 7, the transition section 8 and the air tap 9 can be welded and fixed into a whole or can be cast by utilizing an integrated forming process.
The outer end face of the connector 7 is provided with external threads, the connector 7 is fixed in a valve opening of the two-way valve 2 through threads, and a first cavity 10 matched with the valve opening of the two-way valve 2 in size is arranged inside the connector 7.
The air tap 9 is composed of a plurality of stacked frustum structures, the outer diameter of each frustum structure is gradually reduced along the gas flowing direction, and a second cavity 11 is arranged inside the air tap 9.
The transition section 8 is provided with a third chamber 12 therein which communicates with the first chamber 10 and the second chamber 11.
In this embodiment, the diameter of the second chamber 11 is smaller than the diameter of the first chamber 10; preferably, the third chamber 12 is a conical chamber with one end having the same diameter as the first chamber 10 and the other end having the same diameter as the second chamber 11.
The sampling base 1 of this application adopts stainless steel material to make and forms, detects mouth 3 and adopts copper material to make.
When the helium concentration sampling detection device provided by the invention is used for detecting the helium concentration of the secondary insulating layer of the liquid cargo tank of the LNG ship, the method specifically comprises the following steps:
firstly, manufacturing a sublayer invar film, and preassembling the helium concentration sampling detection device on the sampling holes of the sublayer invar film in advance after the sublayer invar film is manufactured;
then, the secondary invar film provided with the helium concentration sampling detection device is arranged on the ship body to form a secondary insulating layer (a gas injection port is reserved on the secondary insulating layer) with the ship body;
and then, helium is injected into the secondary insulating layer through a gas injection port reserved on the secondary insulating layer, after the nitrogen is injected, a two-way valve is opened, the helium in the secondary insulating layer is discharged from the sampling cavity 6, the valve cavity of the two-way valve 2, the first cavity 10, the third cavity 12 and the second cavity 11, a gas concentration detector is adopted to detect the concentration of the helium flowing out of the end part of the air tap 9, if the concentration of the helium reaches 20%, the requirement is met, and if the concentration of the helium does not reach 20%, the helium is continuously injected through the gas injection port of the secondary insulating layer.
Generally, the helium concentration of the sub-layer insulating layer reaching 20% is the detection standard for detecting whether the sub-layer invar film has the missing dots or not by starting a helium test. Taking a certain LNG ship as an example, 16 helium concentration sampling detection devices need to be installed in a No. 2/3/4 cargo tank during a helium test, and 15 helium concentration sampling detection devices need to be installed in a No. 1 cargo tank.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A helium concentration sampling detection method for a helium test of a sublayer insulating layer of a liquid cargo tank of an LNG ship is characterized by comprising the following steps:
s1, manufacturing a sub-layer invar film, and pre-installing a helium concentration sampling detection device on a sampling hole of the sub-layer invar film in advance after the sub-layer invar film is manufactured;
the helium concentration sampling detection device comprises a sampling base fixed on a sampling hole of a sublayer invar film of the sublayer insulating layer, a two-way valve fixed on the sampling base and a detection nozzle fixed on the two-way valve, wherein the sampling base, the two-way valve body and the detection nozzle form an air flow channel together;
s2, mounting the sub-layer invar film provided with the helium concentration sampling detection device on the ship body to form a sub-layer insulation layer with the ship body;
s3, helium is injected into the sub-layer insulating layer through a gas injection port reserved in the sub-layer insulating layer, after nitrogen is injected, a two-way valve is opened, the helium in the sub-layer insulating layer flows through a sampling cavity, the two-way valve and the gas nozzle and is discharged from the end portion of the gas nozzle, a gas concentration detector is adopted to detect the concentration of the helium flowing out of the end portion of the gas nozzle, if the concentration of the helium reaches 20%, the requirement is met, and if the concentration of the helium does not reach 20%, the helium continues to be injected through the gas injection port of the sub-layer insulating layer.
2. The helium concentration sampling detection method for the helium test of the sublayer insulation layer of the cargo tank of the LNG ship as claimed in claim 1, wherein the sampling base comprises a head and a base body, the outer end surfaces of the head and the base body are respectively provided with an external thread, the interiors of the head and the base body are respectively provided with a sampling cavity, and the sampling cavity is communicated with a valve cavity of the two-way valve.
3. The helium concentration sampling detection method for the helium test of the sublayer insulation layer of the cargo tank of the LNG ship as claimed in claim 1, wherein the outer end face of the joint is provided with external threads, the joint is fixed in a valve port of a two-way valve through threads, and a first chamber matched with the size of the valve chamber of the two-way valve is arranged inside the joint;
a second chamber is arranged in the air faucet;
and a third chamber communicated with the first chamber and the second chamber is arranged in the transition section.
4. The helium concentration sampling detection method for the helium test of the liquid cargo tank sublayer insulating layer of the LNG ship as claimed in claim 3, wherein the diameter of the second chamber is smaller than that of the first chamber.
5. The helium concentration sampling detection method for the helium test of the liquid cargo tank sublayer insulating layer of the LNG ship as claimed in claim 3, wherein the third chamber is a conical chamber, one end of the conical chamber is equal to the diameter of the first chamber, and the other end of the conical chamber is equal to the diameter of the second chamber.
6. The helium concentration sampling detection method for the helium test of the sublayer insulation layer of the cargo tank of the LNG ship as claimed in claim 1, wherein the sampling base is made of stainless steel material, and the detection nozzle is made of copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011404618.6A CN112611609A (en) | 2020-12-04 | 2020-12-04 | Helium concentration sampling detection method for helium test of sublayer insulating layer of liquid cargo tank of LNG ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011404618.6A CN112611609A (en) | 2020-12-04 | 2020-12-04 | Helium concentration sampling detection method for helium test of sublayer insulating layer of liquid cargo tank of LNG ship |
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| CN112611609A true CN112611609A (en) | 2021-04-06 |
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|---|---|---|---|---|
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2020
- 2020-12-04 CN CN202011404618.6A patent/CN112611609A/en active Pending
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Application publication date: 20210406 |
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