CN114083187A - Manufacturing method of ellipsoidal large low-pressure storage tank - Google Patents
Manufacturing method of ellipsoidal large low-pressure storage tank Download PDFInfo
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- CN114083187A CN114083187A CN202111472596.1A CN202111472596A CN114083187A CN 114083187 A CN114083187 A CN 114083187A CN 202111472596 A CN202111472596 A CN 202111472596A CN 114083187 A CN114083187 A CN 114083187A
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- storage tank
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- 238000003860 storage Methods 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 88
- 230000007704 transition Effects 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 12
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/12—Vessels
- B23K2101/125—Cans
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a manufacturing method of an ellipsoidal large-sized low-pressure storage tank, wherein a pressure-bearing transition section is assembled by a bulk assembly method and welded with multiple layers and multiple channels, so that the welding quality is improved, the welding defects and the stress are reduced, the tank top and the pressure-bearing transition section are effectively lifted by matching an internal lifting tool and an external lifting tool, the internal and the external of the storage tank are subjected to anti-corrosion treatment by a rotating platform and a sliding plate, the construction period is shortened, and the labor cost and the mechanical cost are saved.
Description
Technical Field
The invention relates to the technical field of storage tank manufacturing, in particular to a method for manufacturing an ellipsoidal large-sized low-pressure storage tank.
Background
For a large-sized low-pressure storage tank, the thickness of the tank wall is thick, and particularly for arc-shaped or spherical plates, welding defects such as air holes, incomplete fusion, incomplete penetration and the like are easily generated during welding, and welding stress and deformation are easily generated;
moreover, the large storage tank is difficult to lift by a conventional inversion method, which causes difficulty in assembling the wall plate;
moreover, the large storage tank has large diameter and height, which causes difficulty in corrosion prevention treatment and pressure test.
Disclosure of Invention
The invention aims to provide a manufacturing method of an ellipsoidal large-sized low-pressure storage tank, wherein a pressure-bearing transition section is assembled and welded in a multilayer multi-channel manner by adopting a bulk assembly method, so that the welding quality is improved, the welding defects and the stress are reduced, and the tank top and the pressure-bearing transition section are effectively lifted by matching an internal lifting tool and an external lifting tool.
In order to achieve the purpose, the invention adopts the following technical scheme:
the manufacturing method of the ellipsoidal large-scale low-pressure storage tank comprises a bottom plate, a wall plate, a pressure-bearing transition section and a tank top; the manufacturing method comprises the following steps:
s1: welding and assembling the bottom plate;
s2: assembling a bracket;
s3: the pressure-bearing transition section is welded and assembled in a bulk method through a bracket;
s4: welding and assembling the tank top;
s5: assembling an external lifting tool, and lifting the pressure-bearing transition section and the tank top;
s6: sequentially welding and assembling the front wall plates;
s7: assembling an inner lifting tool, and integrally lifting the welded storage tank;
s8: and welding and assembling the wall plates in turn.
In some embodiments, the welding position between each plate of the pressure-bearing transition section is provided with a double-sided V-shaped weld groove;
step S3 further includes the following steps:
s31: preheating a welding seam groove area;
s32: carrying out multilayer multi-channel welding on the welding seam groove;
s33: and carrying out heat treatment on the welding seam.
In some embodiments, in step S32, the multi-layer multi-channel welding is: firstly, spot welding is carried out on the welding position, the length of the welding line is between 150 and 200mm, the thickness of the welding line is between 10 and 12mm, the distance of the welding point is between 250 and 300mm, then segmented welding is carried out on the welding position, the upper half section is welded firstly, and the lower half section is welded later until the groove of the welding line is fully welded.
In some embodiments, in step S31, the preheating temperature is between 100 ℃ and 200 ℃;
in step S33, heat treatment is carried out on the welding seam through an electric heating belt and a heat preservation rolling felt, the heat treatment temperature is 610 +/-10 ℃, and the constant temperature is kept for 15 min;
a temperature rising stage, wherein when the temperature rises to more than 300 ℃, the temperature rising speed is controlled to be 50-80 ℃/h;
and in the temperature reduction stage, the temperature reduction speed is controlled to be 30-50 ℃/h, and when the temperature is reduced to be below 300 ℃, the natural cooling is carried out.
In some embodiments, in step S2, the bracket includes an inner umbrella frame and an outer hanger frame.
In some embodiments, in step S7, after the inner lifting tool is assembled, the outer lifting tool is disassembled.
In some embodiments, the manufacturing method further includes step S9;
s9: and carrying out pressure test tests on the storage tank, wherein the pressure test tests comprise an airtight test, a water-gas combined pressure test, a partial vacuum test and a gas pressure test.
In some embodiments, the manufacturing method further includes step S10;
s10: carry out anticorrosive treatment to the storage tank, wherein the inside of storage tank is through rotary platform to the inside of storage tank rust-resistant or the mopping processing, and the outside of storage tank is protected through the slide.
The invention has the beneficial effects that: the pressure-bearing transition section is assembled and welded with multiple layers and multiple channels by adopting a bulk method, so that the welding quality is improved, and the welding defects and stress are reduced;
the lifting is carried out through the matching of the inner lifting tool and the outer lifting tool, so that the tank top and the pressure-bearing transition section are effectively lifted;
moreover, the inside and the outside of the storage tank are subjected to anticorrosive treatment through the rotary platform and the sliding plate, so that the construction period is shortened, and the labor and the mechanical cost are saved.
Drawings
FIG. 1 is an assembled top view of a floor of the storage tank of the present invention;
FIG. 2 is an assembled side view of a pressure-bearing transition section of the storage tank of the present invention;
FIG. 3 is a cross-sectional view of a pressure-bearing transition section of the storage tank of the present invention;
FIG. 4 is a heat treatment block diagram during assembly of a pressure-bearing transition section of the storage tank of the present invention;
FIG. 5 is an assembled side view of the roof of the storage tank of the present invention;
FIG. 6 is a lifting structure diagram of the outer lifting tool of the storage tank of the present invention;
FIG. 7 is a lifting structure diagram of the inner lifting tool of the storage tank of the present invention;
FIG. 8 is a block diagram of the rotary platform of the storage tank of the present invention;
wherein: 10-a storage tank; 1-a bottom plate; 2-wall plate; 3-a pressure-bearing transition section; 31-beveling; 4-tank top; 20-a bracket; 201-umbrella-shaped frame; 202-a pylon; 30-outer lifting tooling; 40-inner lifting tooling; 50-an electrical heating tape; 60-rolling the felt in a heat preservation way; 70-rotating the platform.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 8, in the method for manufacturing an ellipsoidal large-sized low-pressure storage tank, the storage tank 10 includes a bottom plate 1, wall plates 2, a pressure-bearing transition section 3 and a tank roof 4, and forms a large-sized storage tank 10 with a diameter of about 25m and a height of about 28m, wherein the wall thickness of each plate of the storage tank 10 is between 45 mm and 55mm, the tank roof 4 does not have a skylight or open structure, the plates of the pressure-bearing transition section 3 are arc-shaped and are used for connecting the tank roof 4 and the wall plates 2 and are susceptible to stress concentration, and the wall plates 2 are assembled in a multi-turn manner, that is, the wall plates 2 are assembled in a circle, and the upper layer and the lower layer are assembled between each circle.
The manufacturing method comprises the following steps:
s1: referring to fig. 1, a base plate 1 is assembled by welding, wherein the plates of the base plate 1 are assembled by welding, and after the welding is completed, the welded seam is inspected and vacuum test is performed.
S2: referring to fig. 2, a bracket 20 is assembled, and the bracket 20 is used for supporting the pressure-bearing transition section 3 and the tank top 4, wherein the bracket 20 comprises an inner umbrella-shaped frame 201 and an outer hanging frame 202, the pressure-bearing transition section 3 is placed on the umbrella-shaped frame 201, and the outer hanging frame 202 can fix the pressure-bearing transition section 3 through a gantry clamp.
S3: referring to fig. 3 and 4, the pressure-bearing transition section 3 is welded and assembled by the bracket 20 in a bulk method; the pressure-bearing transition section 3 is composed of a plurality of arc-shaped plates, and during assembly, the first block is assembled, the third block is assembled, the fifth block is assembled, and the like until the assembly is completed.
All the plates of the pressure-bearing transition section 3 are welded and assembled, and the welding positions of all the plates are provided with double-sided V-shaped welding seam bevels 31;
step S3 further includes the following welding steps:
s31: preheating the region of the welding groove 31;
s32: carrying out multilayer multi-channel welding on the welding seam groove 31;
s33: and carrying out heat treatment on the welding seam.
Therefore, the shrinkage stress of the welding seam can be controlled by preheating before welding and heat treatment after welding, and the welding stress is eliminated or reduced, so that the welding defects of welding seam cracks, air holes, incomplete fusion, incomplete penetration and the like are reduced, and the welding quality is improved.
Further, in step S32, the multi-layer multi-channel welding is: firstly, spot welding is carried out on the welding position, the length of the welding line is between 150 and 200mm, the thickness of the welding line is between 10 and 12mm, the distance of the welding point is between 250 and 300mm, then, segmented welding is carried out on the welding position, the upper half section is welded firstly, and the lower half section is welded later until the groove 31 of the welding line is fully welded. Thus, the deformation can be reduced by a combination of spot welding and segmented welding.
Further, in step S31, the preheating temperature is between 100 ℃ and 200 ℃;
further, in step S33, the electric heating belt 50 and the heat preservation rolling felt 60 are used to heat treat the welding seam, the electric heating belt 50 and the heat preservation rolling felt 60 are sequentially covered on the welding seam, the heat treatment temperature is 610 ℃ +/-10 ℃, and the temperature is kept for 15 min;
a temperature rising stage, wherein when the temperature rises to more than 300 ℃, the temperature rising speed is controlled to be 50-80 ℃/h;
and in the temperature reduction stage, the temperature reduction speed is controlled to be 30-50 ℃/h, and when the temperature is reduced to be below 300 ℃, the natural cooling is carried out.
S4: referring to fig. 5, the assembled can top 4 is welded; the tank deck 4 is placed over the bracket 20 and then welded to the pressure-bearing transition piece 3.
S5: referring to fig. 6, an external lifting tool 30 is assembled to lift the pressure-bearing transition section 3 and the tank deck 4; because of tank deck 4 does not have structures such as skylight or opening, conventional flip-chip mode is difficult to promote it, and outer promotion frock 30 includes stand and electric block, and outer promotion frock 30 locates the periphery of storage tank 10, promotes pressure-bearing changeover portion 3 and tank deck 4 to follow-up equipment wallboard 2.
S6: sequentially welding and assembling the front wall plates 2; the perpendicularity of the wall plate 2 is ensured during assembly, the wall plate 2 is also provided with a double-sided V-shaped welding seam groove 31, the welding method is the same as or similar to that of the pressure-bearing transition section 3, preheating is firstly carried out during welding, then multilayer multi-channel welding is carried out, tack welding and segmented welding are matched, and finally heat treatment is carried out to eliminate welding stress.
S7: referring to fig. 7, an inner lifting tool 40 is assembled to integrally lift the welded storage tank 10; after lifting to a certain height, switching to the inner lifting tool 40 to lift, wherein the structure of the inner lifting tool 40 is the same as or similar to that of the outer lifting tool 30, the inner lifting tool 40 is arranged on the inner periphery of the storage tank 10 and connected with the front wall plates 2 welded by a plurality of circles, and the wall plates 2 are driven to lift.
S8: and welding and assembling the wall plates 2 in turn for several circles, thereby completing the welding and assembling of the storage tank 10.
Therefore, the storage tank 10 is lifted through the sequential combination of the outer lifting tool 30 and the inner lifting tool 40, the structural construction requirement of the storage tank 10 is met, for example, eight circles of wall plates 2 are arranged, the pressure-bearing transition section 3 and the tank top 4 are lifted after being welded, the outer lifting tool 30 is detached after being lifted to the third circle of wall plate 2, the inner lifting tool 40 is utilized to lift the fourth circle to the eighth circle, namely the front three circles of wall plates 2 are lifted by the outer lifting tool 30, and the rear five circles of wall plates 2 are lifted by the inner lifting tool 40.
S9: pressure tests are performed on the tank 10, including an airtight test, a water-gas combination pressure test, a partial vacuum test, and a pneumatic test.
And (3) air tightness test: the storage tank 10 is slowly charged with compressed air to not more than 13.8KPa, and the charging speed should be strictly controlled. And (3) coating soapy water or other substances capable of displaying gas leakage on all the welding joints on the tank wall above the designed highest liquid level for primary leak detection, removing defects for rewelding if leakage exists, and repeating the specified air tightness test until the leakage is qualified.
Water-gas combined pressure test: the tank 10 was filled with a combination of water and gas to test the sealability of the tank 10.
Partial vacuum test: and closing all the vent holes, and pumping water or air from the tank outwards until the negative pressure of the gas phase space in the tank is close to the designed negative pressure opening pressure value of the breather valve, and checking the capacity of the upper part of the storage tank 10 for bearing partial vacuum and the negative pressure operation condition of the breather valve.
Air pressure test: and (3) evacuating the residual water in the tank, carrying out a vacuum test on the whole storage tank 10, injecting air into the tank again until the pressure in the tank is equal to the design pressure of the storage tank 10 except for different water levels, and checking whether the tank is abnormally changed.
S10: referring to fig. 8, the storage tank 10 is subjected to an anticorrosive treatment in which the inside of the storage tank 10 is subjected to an antirust or painting treatment by the rotating platform 70 and the outside of the storage tank 10 is protected by a sliding plate.
The rotary platform 70 is mainly composed of a base, a column, a pillar, a jacket frame, a tower arm, an operation platform, a lifter device and the like, the operation platform can rotate and lift, the inner wall of the storage tank 10 can be conveniently subjected to rust prevention or painting treatment, the construction period is shortened, and the labor and mechanical costs are saved.
The foregoing disclosure discloses only some embodiments of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept herein, and it is intended to cover all such modifications and variations as fall within the scope of the invention.
Claims (8)
1. The manufacturing method of the ellipsoidal large-scale low-pressure storage tank comprises the steps that the storage tank (10) comprises a bottom plate (1), a wall plate (2), a pressure-bearing transition section (3) and a tank top (4); the manufacturing method comprises the following steps:
s1: welding and assembling the bottom plate (1);
s2: an assembly bracket (20);
s3: the pressure-bearing transition section (3) is welded and assembled in a bulk method through a bracket (20);
s4: welding and assembling the tank top (4);
s5: assembling an external lifting tool (30) and lifting the pressure-bearing transition section (3) and the tank top (4);
s6: sequentially welding and assembling the front wall plates (2);
s7: assembling an inner lifting tool (40) and integrally lifting the welded storage tank (10);
s8: and welding and assembling the wall plates (2) in turn.
2. The manufacturing method of the ellipsoidal large-sized low-pressure storage tank according to claim 1, wherein the welding positions between the plates of the pressure-bearing transition section (3) are provided with double-sided V-shaped weld groove (31);
step S3 further includes the following steps:
s31: preheating the welding groove (31) area;
s32: carrying out multilayer multi-channel welding on the welding seam groove (31);
s33: and carrying out heat treatment on the welding seam.
3. The method of claim 2, wherein in step S32, the multi-layer multi-channel welding comprises: firstly, spot welding is carried out on the welding position, the length of the welding line is between 150 and 200mm, the thickness of the welding line is between 10 and 12mm, the distance of the welding point is between 250 and 300mm, then segmented welding is carried out on the welding position, the upper half section is welded firstly, and the lower half section is welded later until the groove (31) of the welding line is fully welded.
4. The method as claimed in claim 3, wherein the preheating temperature is between 100 ℃ and 200 ℃ in step S31;
in step S33, heat treatment is carried out on the welding seam through an electric heating belt (50) and a heat preservation rolling felt (60), the heat treatment temperature is 610 +/-10 ℃, and the constant temperature is kept for 15 min;
a temperature rising stage, wherein when the temperature rises to more than 300 ℃, the temperature rising speed is controlled to be 50-80 ℃/h;
and in the temperature reduction stage, the temperature reduction speed is controlled to be 30-50 ℃/h, and when the temperature is reduced to be below 300 ℃, the natural cooling is carried out.
5. The method for manufacturing a large ellipsoidal low-pressure tank according to claim 1, wherein the bracket (20) comprises an inner umbrella frame (201) and an outer hanger frame (202) in step S2.
6. The method for manufacturing a large ellipsoidal low-pressure tank according to claim 1, wherein in step S7, the outer lifting tool (30) is removed after the inner lifting tool (40) is assembled.
7. The method for manufacturing a large ellipsoidal low-pressure tank according to claim 1, further comprising the step of S9;
s9: pressure tests are performed on the storage tank (10), wherein the pressure tests comprise an airtight test, a water-gas combined pressure test, a partial vacuum test and a pneumatic test.
8. The method for manufacturing a large ellipsoidal low-pressure tank according to claim 7, further comprising the step of S10;
s10: the storage tank (10) is subjected to anticorrosion treatment, wherein the inside of the storage tank (10) is subjected to antirust or painting treatment through the rotating platform (70), and the outside of the storage tank (10) is protected through a sliding plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111472596.1A CN114083187A (en) | 2021-12-03 | 2021-12-03 | Manufacturing method of ellipsoidal large low-pressure storage tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111472596.1A CN114083187A (en) | 2021-12-03 | 2021-12-03 | Manufacturing method of ellipsoidal large low-pressure storage tank |
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| CN114083187A true CN114083187A (en) | 2022-02-25 |
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| CN202111472596.1A Pending CN114083187A (en) | 2021-12-03 | 2021-12-03 | Manufacturing method of ellipsoidal large low-pressure storage tank |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100931794B1 (en) * | 2008-08-21 | 2009-12-14 | 주식회사 디섹 | Lng tank leak testing method |
| CN104060873A (en) * | 2014-06-30 | 2014-09-24 | 成都高普石油工程技术有限公司 | Vertical storage tank prefabricating installing construction method |
| CN203959758U (en) * | 2014-07-23 | 2014-11-26 | 中建三局第三建设工程有限责任公司 | Reservoir walls derusting anti-corrosive lift rotating equipment |
| CN111238738A (en) * | 2020-01-16 | 2020-06-05 | 蓝箭航天技术有限公司 | Liquid rocket spare part hydraulic pressure airtight test system of observing and controling |
| CN111441637A (en) * | 2020-03-27 | 2020-07-24 | 浙江省天正设计工程有限公司 | Large storage tank with stainless steel composite plates manufactured on site and installation method of large storage tank |
| CN111774745A (en) * | 2020-06-08 | 2020-10-16 | 中石化宁波工程有限公司 | Internal and external combined lifting method for low-pressure storage tank body |
-
2021
- 2021-12-03 CN CN202111472596.1A patent/CN114083187A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100931794B1 (en) * | 2008-08-21 | 2009-12-14 | 주식회사 디섹 | Lng tank leak testing method |
| CN104060873A (en) * | 2014-06-30 | 2014-09-24 | 成都高普石油工程技术有限公司 | Vertical storage tank prefabricating installing construction method |
| CN203959758U (en) * | 2014-07-23 | 2014-11-26 | 中建三局第三建设工程有限责任公司 | Reservoir walls derusting anti-corrosive lift rotating equipment |
| CN111238738A (en) * | 2020-01-16 | 2020-06-05 | 蓝箭航天技术有限公司 | Liquid rocket spare part hydraulic pressure airtight test system of observing and controling |
| CN111441637A (en) * | 2020-03-27 | 2020-07-24 | 浙江省天正设计工程有限公司 | Large storage tank with stainless steel composite plates manufactured on site and installation method of large storage tank |
| CN111774745A (en) * | 2020-06-08 | 2020-10-16 | 中石化宁波工程有限公司 | Internal and external combined lifting method for low-pressure storage tank body |
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