CN113884252A - Helium test method for pump tower base of LNG ship - Google Patents
Helium test method for pump tower base of LNG ship Download PDFInfo
- Publication number
- CN113884252A CN113884252A CN202111114126.8A CN202111114126A CN113884252A CN 113884252 A CN113884252 A CN 113884252A CN 202111114126 A CN202111114126 A CN 202111114126A CN 113884252 A CN113884252 A CN 113884252A
- Authority
- CN
- China
- Prior art keywords
- tower base
- helium
- pump tower
- pump
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000001307 helium Substances 0.000 title claims abstract description 66
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 66
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000010998 test method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000005070 sampling Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a helium test method for a pump tower base of an LNG ship, which is characterized in that two helium test tools are arranged on the pump tower base, and the two helium test tools are utilized for performing helium tests.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a helium test method for a pump tower base of an LNG ship.
Background
With the increasing demand for environmental protection, the LNG carrier market has expanded rapidly. The NO96 type containment system is a stable liquid cargo tank technology and is introduced into China many years ago. The containment system comprises two layers of film and two layers of insulation, the primary film contacting the LNG being made of invar material. Because the pump tower base penetrates through the construction process of the primary membrane and the secondary membrane, if the helium test of the pump tower base cannot be timely and effectively completed, the production period cannot be completely guaranteed.
Disclosure of Invention
In view of the above, the present invention provides a helium testing method for a pump tower base of an LNG ship, so as to solve the problems in the background art.
A helium test method for a pump tower base of an LNG ship specifically comprises the following steps:
s1, installing two helium gas test tools on two holes of a pump tower base through plasticine, wherein the plasticine wraps a seam between the helium gas test tools and the pump tower base;
temporary sealing plates are arranged in other holes in the pump tower base, and joints between the temporary sealing plates and the pump tower base are also wrapped and sealed through plasticine;
s2, installing a pressure pipe and a sampling pipe on the first helium test tool;
installing a stop valve on the second helium test tool;
s3, connecting the pump machine with a stop valve, then opening the stop valve, pumping the interior of the pump tower base into negative pressure by using the pump machine, and then closing the stop valve;
and S4, replacing the pump machine with a helium bottle group, opening the stop valve, filling helium into the pump tower base, and detecting whether leakage exists at the welding seam position of the pump tower base by using a helium detector when the pressure pipe displays that the internal pressure of the pump tower base reaches the test pressure and the sampling pipe displays that the helium concentration in the pump tower base reaches the test concentration.
Preferably, the pressure pipe and the sampling pipe are connected with the first helium testing tool through a three-way valve.
Preferably, the helium test tool comprises a fixing plate covering the hole of the pump tower base and a connecting pipe vertically fixed on the fixing plate, and a vent hole is formed in the center of the fixing plate.
Preferably, when the inside of the pump tower base is pumped to negative pressure by the pump in the step S3, the stop valve is closed when the pressure inside the pump tower base reaches-300 mbar.
Preferably, in the step S4, when the pressure tube indicates that the internal pressure of the pump tower base reaches +20mbar and the sampling tube indicates that the helium concentration in the pump tower base is not lower than 20% of the set concentration, the helium detector is used to detect whether there is a leak at the welding seam position of the pump tower base.
The invention has the beneficial effects that:
1. the method is simple and convenient to operate, 3 workers can complete the helium test of the pump tower base within 30 minutes when the method is adopted, and compared with the method in the prior art that 6 workers need to complete the helium test of the pump tower base within 1 hour, the method disclosed by the invention has the advantages that the efficiency is improved by more than 1 time, meanwhile, the working difficulty is reduced, the labor consumption is reduced, the construction working hours are greatly reduced, and the construction efficiency of the ship is improved.
2. The seam between experimental frock of helium and interim shrouding and the pump tower base hole seals through the plasticine, make full use of the plasticity and the recoverability of plasticine, the sealing performance between experimental frock of helium and interim shrouding and the pump tower base hole can not receive the influence of steel sheet roughness around the hole, even if the pump tower base steel sheet unevenness around the hole promptly, the plasticine also can realize sealing completely, makes the pump tower base form an airtight space.
3. The plasticine can be recycled and is also very convenient to disassemble, the pump tower base and the helium gas test tool cannot be damaged, the helium gas test tool which is disassembled can be reused, and the production cost of enterprises is greatly reduced.
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 illustration of a helium test using a helium test tool.
FIG. 2 is a schematic structural diagram of a helium test tool.
The reference numerals in the figures have the meaning:
1 is the experimental frock of helium, 2 is the pump tower base, and 3 are interim shrouding, and 4 are the fixed plate, and 5 are the connecting pipe, and 6 are the air vent, and 7 are the pressure pipe, and 8 are the sampling tube, and 9 are the stop valve, and 10 are the pump machine, and 11 are helium gas bottle group.
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 test method for a pump tower base of an LNG ship, which specifically comprises the following steps:
and S1, installing the two helium test tools 1 on two holes of the pump tower base 2 through plasticine, wherein the plasticine wraps the seam between the helium test tools 1 and the pump tower base 2. Other holes on the pump tower base 2 set up interim shrouding 3, and the seam between interim shrouding 3 and the pump tower base 2 also wraps up sealedly through plasticine to make pump tower base 2 form an airtight space.
In this embodiment, the helium test fixture 1 includes a fixing plate 4 covering the hole of the pump tower base 2 and a connecting pipe 5 vertically fixed on the fixing plate 4, and a vent hole 6 is opened in the center of the fixing plate 4.
The temporary sealing plate 3 is a steel plate with any shape not smaller than the size of the hole of the pump tower base.
And S2, mounting the pressure pipe 7 and the sampling pipe 8 on the first helium testing tool, specifically, mounting a three-way valve on a connecting pipe of the first helium testing tool, and respectively connecting the pressure pipe 7 and the sampling pipe 8 to the other two valve ports of the three-way valve.
And a stop valve 9 is arranged on the second helium testing tool.
S3, the pump 10 is connected to the cutoff valve 9, the cutoff valve 9 is opened, the pump 10 is used to pump the inside of the pump tower base 2 to a negative pressure, and the cutoff valve 9 is closed.
In this embodiment, the shut-off valve 9 is closed when the pressure inside the pump tower base 2 reaches-300 mbar.
S4, replacing the pump 10 with a helium bottle group 11, then opening the stop valve 9, filling helium into the pump tower base 2, and detecting whether leakage exists at the welding seam position of the pump tower base 2 by using a helium detector when the pressure pipe 7 shows that the internal pressure of the pump tower base 2 reaches the test pressure and the sampling pipe 8 shows that the helium concentration in the pump tower base 2 reaches the test concentration.
In this embodiment, when the pressure pipe 7 shows that the internal pressure of the pump tower base 2 reaches +20mbar and the sampling pipe 8 shows that the helium concentration in the pump tower base 2 is not lower than 20% of the set concentration, whether the welding seam position of the pump tower base 2 has leakage is detected by using a helium detector.
The helium detector detects every 15 minutes.
Multiple tests prove that 3 workers can complete the helium test of the pump tower base within 30 minutes when the method is adopted, and compared with the method in the prior art that 6 workers need to complete the helium test of the pump tower base within 1 hour, the method disclosed by the invention has the advantages that the efficiency is improved by more than 1 time, meanwhile, the working difficulty is reduced, the labor consumption is reduced, the construction working hours are greatly reduced, and the construction efficiency of a ship is improved.
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 (5)
1. The helium test method for the pump tower base of the LNG ship is characterized by comprising the following steps:
s1, installing two helium gas test tools on two holes of a pump tower base through plasticine, wherein the plasticine wraps a seam between the helium gas test tools and the pump tower base;
temporary sealing plates are arranged in other holes in the pump tower base, and joints between the temporary sealing plates and the pump tower base are also wrapped and sealed through plasticine;
s2, installing a pressure pipe and a sampling pipe on the first helium test tool;
installing a stop valve on the second helium test tool;
s3, connecting the pump machine with a stop valve, then opening the stop valve, pumping the interior of the pump tower base into negative pressure by using the pump machine, and then closing the stop valve;
and S4, replacing the pump machine with a helium bottle group, opening the stop valve, filling helium into the pump tower base, and detecting whether leakage exists at the welding seam position of the pump tower base by using a helium detector when the pressure pipe displays that the internal pressure of the pump tower base reaches the test pressure and the sampling pipe displays that the helium concentration in the pump tower base reaches the test concentration.
2. The helium test method for the pump tower base of the LNG ship as claimed in claim 1, wherein the pressure pipe and the sampling pipe are connected with the first helium test tool through a three-way valve.
3. The LNG ship pump tower base helium test method according to claim 1 or 2, wherein the helium test tool comprises a fixing plate covering a hole of the pump tower base and a connecting pipe vertically fixed on the fixing plate, and a vent hole is formed in the center of the fixing plate.
4. The helium test method for the pump tower base of the LNG ship as claimed in claim 1, wherein when the pump is used to pump the inside of the pump tower base to a negative pressure in step S3, the stop valve is closed when the pressure inside the pump tower base reaches-300 mbar.
5. The helium test method for the pump tower base of the LNG ship as claimed in claim 1, wherein in the step S4, when the pressure tube indicates that the internal pressure of the pump tower base reaches +20mbar and the sampling tube indicates that the helium concentration in the pump tower base is not lower than 20% of the set concentration, a helium detector is used to detect whether there is a leakage at the welding seam position of the pump tower base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111114126.8A CN113884252A (en) | 2021-09-23 | 2021-09-23 | Helium test method for pump tower base of LNG ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111114126.8A CN113884252A (en) | 2021-09-23 | 2021-09-23 | Helium test method for pump tower base of LNG ship |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113884252A true CN113884252A (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111114126.8A Pending CN113884252A (en) | 2021-09-23 | 2021-09-23 | Helium test method for pump tower base of LNG ship |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113884252A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100102886A (en) * | 2009-03-12 | 2010-09-27 | 주식회사 디섹 | Tightness testing method for lng cargo tank of gtt no96 membrane type |
| CN207937123U (en) * | 2018-03-07 | 2018-10-02 | 江苏省特种设备安全监督检验研究院常州分院 | Weld seam leak detection vacuum tank |
| CN211121838U (en) * | 2019-12-20 | 2020-07-28 | 新疆金风科技股份有限公司 | Air tightness test tool |
| CN112595466A (en) * | 2020-12-04 | 2021-04-02 | 沪东中华造船(集团)有限公司 | Helium concentration sampling detection device for helium test of sublayer insulating layer of liquid cargo tank of LNG ship |
-
2021
- 2021-09-23 CN CN202111114126.8A patent/CN113884252A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100102886A (en) * | 2009-03-12 | 2010-09-27 | 주식회사 디섹 | Tightness testing method for lng cargo tank of gtt no96 membrane type |
| CN207937123U (en) * | 2018-03-07 | 2018-10-02 | 江苏省特种设备安全监督检验研究院常州分院 | Weld seam leak detection vacuum tank |
| CN211121838U (en) * | 2019-12-20 | 2020-07-28 | 新疆金风科技股份有限公司 | Air tightness test tool |
| CN112595466A (en) * | 2020-12-04 | 2021-04-02 | 沪东中华造船(集团)有限公司 | Helium concentration sampling detection device for helium test of sublayer insulating layer of liquid cargo tank of LNG ship |
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Application publication date: 20220104 |