CN115046693B - Thin film type LNG transport ship liquid cargo tank inspection method - Google Patents
Thin film type LNG transport ship liquid cargo tank inspection method Download PDFInfo
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- CN115046693B CN115046693B CN202210971086.7A CN202210971086A CN115046693B CN 115046693 B CN115046693 B CN 115046693B CN 202210971086 A CN202210971086 A CN 202210971086A CN 115046693 B CN115046693 B CN 115046693B
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- 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
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/145—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for welds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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Abstract
The invention relates to the technical field of ship construction, in particular to a method for inspecting a liquid cargo tank of a film type LNG transport ship. The method avoids the dependence on helium in the traditional tightness test, the glycerol can be repeatedly utilized, the overall construction cost is reduced, a plurality of persons work simultaneously, the inspection efficiency can be greatly improved, the method integrates the mechanical stress test and the tightness test of the cargo tank, the inspection process is simplified, and the overall inspection efficiency is further improved.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a method for inspecting a liquid cargo tank of a film type LNG transport ship.
Background
The LNG transport ship is a special ship for transporting liquefied gas at the low temperature of-163 ℃, the liquid cargo tank of the LNG transport ship comprises an outer protective layer, a secondary insulating layer, a secondary thin film layer, a main insulating layer and a main thin film layer which are sequentially arranged from outside to inside, wherein the outer protective layer is a protective bottom plate, the main insulating layer and the secondary insulating layer are insulating boxes and are used for keeping the temperature of goods in the cabin in the transportation process, a plurality of clamping tongues which are arranged at equal intervals are embedded in the inner side of each insulating box, the main thin film layer and the secondary thin film layer are formed by welding a plurality of pieces of invar steel, and the adjacent sides of the adjacent invar steel are respectively welded to the two sides of the same clamping tongue. Leakage from the cargo tanks not only causes a significant economic loss, but also puts the vessel in a dangerous situation, due to the loading of the liquefied gas at very low temperatures.
To ensure safety, the LNG carrier must be provided with a highly accurate and reliable cargo tank, and during the manufacturing process of the cargo tank, the strength and the tightness of the cargo tank need to be checked, which is generally divided into four steps: strength test (Strength test), bearing test (Bearing test), mechanical stress test (Mechanical stress test), and tightness test (Helium test). The strength test and the bearing capacity test adopt a mode of vacuumizing the insulating layer, and the strength and the bearing capacity of the liquid cargo tank are respectively tested by negative pressure of-800 mbar and-200 mbar. The mechanical stress test and the tightness test are to test the mechanical strength and the tightness of the welding at the clamping tongue of the liquid cargo tank by adopting the pressure of +20 mbar.
When carrying out the tightness test, need at first step down the insulating layer to the exhaust air, then pour into the helium into, use helium mass spectrometer leak detector to inspect LNG carrier cargo tank tightness again, each cargo tank only has an equipment, and it is long consuming time to inspect, and efficiency is lower, and because the helium needs to purchase, belongs to disposable, and the cost is higher again, therefore mechanical stress test and tightness test are two different processes, has further reduced whole efficiency of construction.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a method for inspecting a liquid cargo tank of a film type LNG transport ship.
The invention is realized by the following technical scheme:
the method for inspecting the liquid cargo tank of the film type LNG transport ship is characterized by comprising the following steps:
s10, filling detection gas into the insulating layer through a pressure control device, and enabling the film layer close to the inner side of the insulating layer to be expanded under air pressure, wherein the film layer is formed by welding a plurality of pieces of invar steel, and the adjacent side edges of the adjacent invar steel are respectively welded to the two sides of the same latch;
step S20, glycerol is sprayed at the tongue clamping welding seam of the thin film layer through an auxiliary inspection device, the auxiliary inspection device comprises a glycerol storage tank, a control handle and an air pump for controlling the pressure in the glycerol storage tank, the control handle comprises a handle body and nozzles arranged on the handle body, the glycerol storage tank is communicated with the nozzles through flexible pipes, the handle body is provided with a control switch, the control switch is electrically connected with the air pump and used for realizing the injection of the nozzles or the recovery of the glycerol, the number of the nozzles is two, the two nozzles are oppositely arranged, and the handle body is made of elastic materials,
in a natural state, the distance between the two nozzles is smaller than the distance between the welding lines at the two sides of the clamping tongue,
under the working state, the handle body deforms to enable the two nozzles to be attached to welding seams on two sides of the clamping tongue respectively;
step S30, enabling the pressure of the detected gas in the insulating layer to be higher than the initial pressure by 20mbar through a pressure control device, and keeping the pressure for 25-35 minutes, wherein the initial pressure is the atmospheric pressure of the external environment during the test;
step S40, obtaining the breakage result of the clamping tongue welding seam of the film layer, simultaneously obtaining the detection result of bubbles in the glycerol coating,
if the clamping tongue welding seam of the film layer is damaged and/or bubbles are generated in the glycerol coating, step S50 is executed,
otherwise, executing step S60;
s50, reducing the nitrogen in the insulating layer to the initial pressure, repairing the liquid cargo tank, and executing the step S30;
step S60, reducing the nitrogen gas in the insulating layer to an initial pressure, step S30 is performed,
and (5) continuously executing the steps S30, S40 and S60 for three times, and terminating the test, wherein the results of the mechanical stress test and the tightness test of the liquid cargo tank are qualified.
Preferably, the step S60 further includes a step S61: and if the mechanical stress test and the tightness test of the liquid cargo tank are qualified, recycling the glycerol at the welding seam of the clamping tongue through the auxiliary inspection device.
Preferably, the detection gas in step S10 is dry nitrogen, and is prepared from air by a nitrogen generator.
Preferably, the dew point of the detection gas in the step S10 is lower than-20 ℃.
Preferably, in the step S20, the auxiliary inspection device moves along the length direction of the latch welding seam, wherein the moving speed of the auxiliary inspection device is 0.54-0.66 m/min, and the spraying flow rate of the glycerol is 0.006-0.012L/min.
Preferably, the auxiliary inspection device further comprises a self-walking trolley, and the glycerol storage tank and the air pump are both arranged on the self-walking trolley.
Preferably, the wheel track of the self-walking trolley is smaller than the distance between two adjacent clamping tongues, and the self-walking trolley is provided with a laser guide module matched with the self-walking trolley in a guide mode.
The invention has the beneficial effects that:
the helium dependence in the traditional tightness test is avoided, the glycerol can be recycled, the overall construction cost is reduced, a plurality of persons can work simultaneously in the process from step S20 to step S40, the inspection efficiency can be greatly improved, the mechanical stress test and the tightness test of the liquid cargo tank are combined into one, the inspection process is simplified, and the overall inspection efficiency is further improved; the dew point of the detection gas is controlled to be lower than-20 ℃, and a non-aqueous viscous organic matter glycerol is selected as a detection medium, so that the thin film layer can be prevented from rusting; the auxiliary inspection device is convenient for workers to spray glycerol to the clamping tongue welding seam or complete the recovery of the glycerol, and has strong convenience; due to the arrangement of the two nozzles, welding seams on two sides of the clamping tongue can be sprayed at the same time, so that the working efficiency is improved; the handle body made of elastic materials can enable the two nozzles to be tightly attached to welding seams on two sides of the clamping tongue respectively, viscous glycerol can be uniformly coated on the welding seams, bubbles are prevented from being generated in the spraying process, meanwhile, the two nozzles are respectively abutted to the welding seams on two sides of the clamping tongue under the elastic action of the handle body, a worker does not need to additionally apply acting force to press the nozzles to the welding seams, and the obvious labor-saving effect is achieved while the working efficiency is improved; the laser guiding module can realize automatic advance along the clamping tongue from the walking trolley.
Drawings
FIG. 1 is a schematic view of the structure of a cargo tank according to the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic view of the structure of the auxiliary inspection device of the present invention;
fig. 4 is a schematic structural view of the control handle of the present invention.
In the figure: 1. an outer protective layer; 2. a sub-insulating layer; 3. a main insulating layer; 4. a secondary thin film layer; 5. a primary film layer; 6. a latch; 7. an air pump; 8. a glycerol storage tank; 9. a flexible tube; 10. a control handle; 101. a handle body; 102. a nozzle; 11. a self-walking trolley; 12. a laser guide module; 13. and controlling the switch.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The invention comprises the following steps:
step S10, filling detection gas into the insulating layer through a pressure control device, controlling the dew point of the detection gas to be lower than-20 ℃, preventing the thin film layer from rusting, wherein the detection gas is dry nitrogen and is prepared by a nitrogen generator by taking air as a raw material, and the thin film layer close to the inner side of the insulating layer is swelled by air pressure, as shown in figure 1, the liquid cargo tank can be divided into the following two conditions according to the structure of the liquid cargo tank:
if the sub-thin film layer 4 is inspected, the inspection gas is filled in the sub-insulating layer 2, i.e., between the outer protective layer 1 and the sub-thin film layer 4, the sub-thin film layer 4 is inflated by the gas pressure,
when the main thin film layer 5 is inspected, the inspection gas is filled into the main insulating layer 3, that is, between the sub-thin film layer 4 and the main thin film layer 5, the main thin film layer 5 is inflated by the gas pressure,
the main film layer 5 and the secondary film layer 4 are formed by welding a plurality of invar steels, and the adjacent sides of the adjacent invar steels are respectively welded to the two sides of the same clamping tongue 6;
step S20, a welding structure of the latch 6 on the main film layer 5 is shown in fig. 2, glycerol is sprayed on a welding seam of the latch 6 on the film layer through an auxiliary inspection device, as shown in fig. 3, the auxiliary inspection device comprises a glycerol storage tank 8, a control handle 10 and an air pump 7, the glycerol storage tank 8 is used for storing glycerol, the air pump 7 is used for adjusting the glycerol storage tank 8 to keep positive pressure or negative pressure, as shown in fig. 4, the control handle 10 comprises a handle body 101 and a nozzle 102 arranged on the handle body 101, the glycerol storage tank 8 is communicated with the nozzle 102 through a flexible pipe 9, the flexible pipe 9 is a metal hose or a braided pipe and the like capable of bearing negative pressure, the width of the nozzle 102 is 10mm, it is guaranteed that the sprayed glycerol can completely cover the welding seam of the latch 6, the handle body 101 is provided with a control switch 13, and the control switch 13 is electrically connected with the air pump 7 and used for realizing the purpose that the nozzle 102 sprays or recovers the glycerol. When a worker controls the air pump 7 to rotate reversely through the control switch 13, the glycerol storage tank 8 keeps positive pressure, and glycerol in the glycerol storage tank 8 is sprayed to the welding seam of the clamping tongue 6 through the flexible pipe 9 and the nozzle 102; when the staff controls the air pump 7 to rotate forwardly through the control switch 13, the glycerol storage tank 8 keeps negative pressure, the glycerol is recovered from the welding seams of the clamping tongue 6 through the nozzles 102 and the flexible pipe 9, the operation is convenient, the two nozzles 102 are arranged oppositely, and the welding seams on the two sides of the clamping tongue 6 can be sprayed simultaneously. It should be noted that, each two nozzles 102 disposed oppositely are a group, and multiple groups may be disposed. The handle body 101 is made of an elastic material, and can be elastically deformed when an external force is applied, for example, made of a PVC material or a rubber material. Under the natural state, two nozzle 102 intervals are less than the interval of the 6 both sides welding seams of block tongue, under the operating condition, handle body 101 produces deformation and makes two nozzle 102 closely laminate to the 6 both sides welding seams of block tongue respectively, can make viscous glycerine evenly coat to the welding seam, prevent the spraying in-process and produce the bubble, simultaneously, make two nozzle 102 butt respectively to the welding seam of 6 both sides of block tongue under the elastic action of handle body, need not the staff and additionally exert effort and press nozzle 102 to the welding seam, played comparatively obvious laborsaving effect when improving work efficiency. The auxiliary inspection device moves along the length direction of the welding line of the clamping tongue 6, wherein the moving speed of the auxiliary inspection device is 0.54-0.66 m/min, the spraying flow rate of the glycerol is 0.006-0.012L/min, specifically, the moving speed of the auxiliary inspection device is 0.6 m/min, the spraying flow rate of the glycerol is 0.010L/min, the glycerol can be uniformly sprayed to the welding line of the clamping tongue 6 to form a glycerol coating, and the non-aqueous viscous organic matter glycerol is selected as a detection medium, so that a thin film layer can be prevented from rusting;
step S30, enabling the pressure of the detected gas in the insulating layer to be higher than the initial pressure by 20mbar through a pressure control device, and keeping the pressure for 25-35 minutes, specifically, keeping the pressure for 30 minutes, wherein the initial pressure is the atmospheric pressure of the external environment when the test is carried out;
step S40, the mechanical stress inspection is carried out on the welding seam of the clamping tongue 6 to obtain the damage result of the welding seam of the clamping tongue 6 of the film layer,
meanwhile, the tightness of the welding seam of the clamping tongue 6 is checked, the detection result of bubbles in the glycerol coating is obtained, a strong light flashlight is used for checking along the clamping tongue 6 in the process, if a leak point exists at the welding seam of the clamping tongue 6, the bubbles appear under illumination,
if the welding seam of the clamping tongue 6 of the film layer is damaged and/or bubbles are generated in the glycerol coating, step S50 is executed,
otherwise, executing step S60;
s50, reducing the nitrogen in the insulating layer to the initial pressure, repairing the liquid cargo tank, and executing the step S30;
step S60, reducing the nitrogen gas in the insulating layer to an initial pressure, step S30 is performed,
and (3) continuously executing the steps S30, S40 and S60 for three times, and terminating the test to show that the detection results of the mechanical stress test and the tightness test of the liquid cargo tank are qualified, so that the method avoids the dependence on helium in the traditional tightness test, reduces the overall construction cost, can simultaneously work by a plurality of persons in the process of repeatedly executing the steps S20 to S40, and can greatly improve the inspection efficiency.
The step S60 further includes a step S61: if the mechanical stress test and the tightness test of the liquid cargo tank are qualified, the glycerol at the welding seam of the clamping tongue 6 is recovered through the auxiliary inspection device, so that the cost can be saved, and the next use is facilitated.
The auxiliary inspection device further comprises a self-walking trolley 11, the glycerol storage tank 8 and the air pump 7 are arranged on the self-walking trolley 11, and the auxiliary inspection device can conveniently advance along the welding line direction of the clamping tongue 6.
The wheel track of the self-walking trolley 11 is smaller than the distance between two adjacent clamping tongues 6, so that the self-walking trolley 11 can conveniently move between the two adjacent clamping tongues 6, and the self-walking trolley 11 is provided with a laser guide module 12 which is matched with the self-walking trolley 11 in a guide mode and is used for guiding the self-walking trolley 11 to move along the length direction of the welding seam of the clamping tongues 6, so that the self-walking trolley 11 can automatically move.
The helium dependence in the traditional tightness test is avoided, the glycerol can be recycled, the overall construction cost is reduced, a plurality of persons can work simultaneously in the process from step S20 to step S40, the inspection efficiency can be greatly improved, the mechanical stress test and the tightness test of the liquid cargo tank are combined into one, the inspection process is simplified, and the overall inspection efficiency is further improved; the dew point of the detection gas is controlled to be lower than-20 ℃, and a non-aqueous viscous organic matter glycerol is selected as a detection medium, so that the thin film layer can be prevented from rusting; the auxiliary inspection device is convenient for workers to spray glycerol to the clamping tongue welding seam or complete the recovery of the glycerol, and has strong convenience; due to the arrangement of the two nozzles, welding seams on two sides of the clamping tongue can be sprayed at the same time, so that the working efficiency is improved; the handle body made of elastic materials can enable the two nozzles to be tightly attached to welding seams on two sides of the clamping tongue respectively, viscous glycerol can be uniformly coated on the welding seams, bubbles are prevented from being generated in the spraying process, meanwhile, the two nozzles are respectively abutted to the welding seams on two sides of the clamping tongue under the elastic action of the handle body, a worker does not need to additionally apply acting force to press the nozzles to the welding seams, and the obvious labor-saving effect is achieved while the working efficiency is improved; the laser guide module can realize automatic advance along the block tongue from the walking dolly.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The method for inspecting the liquid cargo tank of the film type LNG transport ship is characterized by comprising the following steps:
step S10, filling detection gas into the insulating layer through a pressure control device, and enabling the thin film layer close to the inner side of the insulating layer to be bulged under the action of air pressure, wherein the thin film layer is formed by welding a plurality of invar steels, and the adjacent side edges of the adjacent invar steels are respectively welded to the two sides of the same clamping tongue;
step S20, glycerol is sprayed at the tongue clamping welding seam of the thin film layer through an auxiliary inspection device, the auxiliary inspection device comprises a glycerol storage tank, a control handle and an air pump for controlling the pressure in the glycerol storage tank, the control handle comprises a handle body and nozzles arranged on the handle body, the glycerol storage tank is communicated with the nozzles through flexible pipes, the handle body is provided with a control switch, the control switch is electrically connected with the air pump and used for realizing the injection of the nozzles or the recovery of the glycerol, the number of the nozzles is two, the two nozzles are oppositely arranged, and the handle body is made of elastic materials,
in a natural state, the distance between the two nozzles is smaller than the distance between the welding lines at the two sides of the clamping tongue,
under the working state, the handle body deforms to enable the two nozzles to be attached to welding seams on two sides of the clamping tongue respectively;
step S30, enabling the pressure of the detected gas in the insulating layer to be higher than the initial pressure by 20mbar through a pressure control device, and keeping the pressure for 25-35 minutes, wherein the initial pressure is the atmospheric pressure of the external environment during the test;
step S40, obtaining the breakage result of the clamping tongue welding seam of the film layer, simultaneously obtaining the detection result of bubbles in the glycerol coating,
if the clamping tongue welding seam of the film layer is damaged and/or bubbles are generated in the glycerol coating, step S50 is executed,
otherwise, executing step S60;
s50, reducing the nitrogen in the insulating layer to the initial pressure, repairing the liquid cargo tank, and executing the step S30;
step S60, reducing the nitrogen gas in the insulating layer to an initial pressure, step S30 is performed,
and (5) continuously executing the steps S30, S40 and S60 for three times, and terminating the test, wherein the results of the mechanical stress test and the tightness test of the liquid cargo tank are qualified.
2. The method for inspecting a cargo tank of a membrane type LNG carrier according to claim 1, wherein the step S60 further comprises the step S61 of: and if the mechanical stress test and the tightness test of the liquid cargo tank are qualified, recycling the glycerol at the welding seam of the clamping tongue through the auxiliary inspection device.
3. The method of claim 1, wherein the sensing gas in the step S10 is dry nitrogen gas, and is prepared from air by a nitrogen generator.
4. The method for inspecting a cargo tank of a membrane type LNG carrier according to claim 1, wherein the dew point of the sensing gas in the step S10 is lower than-20 ℃.
5. The method as claimed in claim 1, wherein the auxiliary inspection device is moved along the length direction of the latch welding line in step S20, wherein the moving speed of the auxiliary inspection device is 0.54-0.66 m/min, and the spraying flow rate of the glycerol is 0.006-0.012L/min.
6. The method as claimed in claim 1, wherein the auxiliary inspection apparatus further comprises a self-propelled carriage, and the glycerol storage tank and the air pump are both disposed on the self-propelled carriage.
7. The method for inspecting the cargo tank of the film type LNG carrier as claimed in claim 6, wherein the track of the self-traveling carriage is smaller than the distance between two adjacent latches, and the self-traveling carriage is provided with a laser guide module adapted to the self-traveling carriage.
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| KR101022860B1 (en) * | 2009-03-12 | 2011-03-16 | 주식회사 디섹 | Tightness Testing Method for LNG Cargo Tank of GTT NO96 Membrane Type |
| CN104296941A (en) * | 2014-10-21 | 2015-01-21 | 浙江海洋学院 | Fillet weld tightness test method of hull structure |
| CN104596704B (en) * | 2015-03-02 | 2017-09-22 | 启东丰顺船舶重工有限公司 | A kind of LNG tank body test method |
| CN205781958U (en) * | 2016-05-18 | 2016-12-07 | 沪东中华造船(集团)有限公司 | A kind of film type LNG storage tank being provided with pump well device |
| CN114812957A (en) * | 2022-03-23 | 2022-07-29 | 武汉艾科滤膜技术有限公司 | Hollow fiber membrane component leakage detection method and device |
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| CN109297644A (en) * | 2018-10-31 | 2019-02-01 | 上海江南长兴造船有限责任公司 | A kind of close property detection method for 90 ° of fillet welds at LNG ship CM node |
| CN109297645A (en) * | 2018-10-31 | 2019-02-01 | 上海江南长兴造船有限责任公司 | A kind of close property detection method for 45° angle weld seam at LNG ship CM node |
| 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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