CN105423018A - Leakage detecting device of high-temperature flange connecting system - Google Patents
Leakage detecting device of high-temperature flange connecting system Download PDFInfo
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- CN105423018A CN105423018A CN201610009935.5A CN201610009935A CN105423018A CN 105423018 A CN105423018 A CN 105423018A CN 201610009935 A CN201610009935 A CN 201610009935A CN 105423018 A CN105423018 A CN 105423018A
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- flange
- leak
- elevated temperature
- chamber
- checking apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/006—Attachments
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a leakage detecting device of a high-temperature flange connecting system. The leakage detecting device comprises a sealed cavity formed by two leakage detecting pipes, a first flange, a second flange and a gasket. A heating mechanism is arranged in the sealed cavity, and a pressurizing mechanism delivers gas into the sealed cavity. The outer side of the first flange and the outer side of the second flange are sleeved with an annular rigid piece, two annular grooves are formed in the inner side of the rigid piece and internally provided with sealing rings respectively, and the two sealing rings are in close contact with the lateral side of the first flange and the lateral side of the second flange respectively. A plurality of pairs of threaded through holes evenly distributed around the leakage detecting pipes are formed in the rigid piece, each pair of threaded through holes are symmetrical with respect to the gasket, a bolt is arranged in each threaded through hole, and the first flange and the second flange are matched and jacked through the pairs of bolts. The sealed leakage detecting cavity is defined by the gasket, the first flange, the second flange, the sealing rings and the rigid piece and connected with a mass spectrum detector through a pipe. According to the leakage detecting device, normal stressing of the gasket can not be influenced by the leakage detecting cavity, and the testing result is truer.
Description
Technical field
The present invention relates to a kind of leak-checking apparatus of Flanged Joints at Elevated Temperature.
Background technique
Flange joint is widely used in all trades and professions such as oil, chemical industry, space flight and aviation, and Flange joint is Placement common in pressure vessels and pipes equipment.Because Flanged Connection System long-term work is under the working environment of High Temperature High Pressure, for modal bolt flange, easily there is the problems such as bolt elongate, flange warpage, pad distortion, flange deflection in flange, and these problems all can make Bolted Flanged Connection system produce leakage to a certain extent, leak if system produces, probably cause economic loss and security incident.
In order to improve the tightness of Flanged Connection System, need to obtain Flanged Connection System leak rate data at high temperature under high pressure, people devise the leak-down rate of special device to test Flanged Joints at Elevated Temperature.But existing leak-checking apparatus can only test the leakage rate of Bolted Flanged Connection system, can not test for non-bolted form, and also there is following problem in existing leak-checking apparatus: existing leak-checking apparatus adopts two kinds of methods to obtain leakage rate, a kind of is by the pressure to closed conduit make-up gas maintenance closed conduit, magnitude of recruitment is amount of leakage, this method operation easier is large, equipment cost is high, another kind is the chamber of leaking hunting that manual manufacture one is communicated with closed conduit, in the chamber of leaking hunting of collecting, gas is amount of leakage, this method is simple to operate, cost is low, but the making in chamber of leaking hunting is generally arrange cylinder between the left flange of the radial outside of pad and right flange, cylinder, left flange, right flange and pad surround closed chamber of leaking hunting, this chamber of leaking hunting have impact on the normally stressed of pad, because it is stressed that cylinder assume responsibility for a part at the radial outside of pad, what therefore record is not leakage rate under pad ordinary loading conditions, there is certain deviation, and cylinder makes flange along annulus uniform stressed, be not bolted non-homogeneous stressed, can not simulate normal by force phenomenon.
Summary of the invention
The object of this invention is to provide a kind of leak-checking apparatus of Flanged Joints at Elevated Temperature, this device arrange chamber of leaking hunting can not affect pad normally stressed, test result is truer.
The technical solution adopted in the present invention is:
A kind of leak-checking apparatus of Flanged Joints at Elevated Temperature, comprise two pipelines that leak hunting, the first flange connected by two pipelines of leaking hunting and the second flange, be located at pad, heating machanism, pressurizing mechanism between the first flange and the second flange facing, the front of motor of two pipelines that leak hunting all is closed and forms Seal cage in inside, heating machanism is located in Seal cage, and pressurizing mechanism carries gas to Seal cage, the outside cover of the first flange and the second flange has the rigid pipe of annular, two place's annular grooves are provided with inside rigid pipe, seal ring is equipped with in annular groove, two seal rings respectively with the side close contact of the first flange and the second flange, rigid pipe is provided with some opposing connections and leaks hunting the equally distributed tapped through hole of pipeline, every double thread through hole is all symmetrical about pad, each tapped through hole is provided with a bolt, first flange and the cooperation of the second flange hold out against by often pair of bolt respectively, pad, first flange, second flange, seal ring and rigid pipe surround the chamber of leaking hunting of sealing, chamber of leaking hunting is connected with mass spectrometer detector by pipeline.
Further, the first flange and the second flange and threaded bolt contacts place are equipped with positioning groove, and bolt is positioned at positioning groove.
Further, the first flange or the second flange ring are upwards evenly distributed with foil gauge, and foil gauge is connected with dynamic strainometer and computer successively.
Further, leak hunting on pipeline that chamber is connected with mass spectrometer detector and be provided with buffer cell, cooling chamber and drying room successively from the one end in chamber of leaking hunting, buffer cell is provided with pressure gauge, cooling chamber is provided with thermometer, leak hunting between chamber and buffer cell, between cooling chamber and drying room, between drying room and mass spectrometer detector and be equipped with valve, between buffer cell and cooling chamber, be provided with pressure regulator valve.
Further, pad is Expanded graphite Composition spacer.
Further, seal ring is O type circle.
Further, the first flange and the second flange are respectively equipped with thermocouple, and the end of probe of thermocouple is positioned at Seal cage, delivery end is connected with computer.
Further, pressurizing mechanism comprises gas holder, and gas holder is communicated with Seal cage by pipeline, and the pipeline of connection gas holder and Seal cage is provided with pressure regulator valve, pressure gauge and valve successively from gas holder one end.
Further, the gas in gas holder is helium, and Mass spectrometer leak detector is helium mass spectrometer leak detector.
Further, heating machanism comprises heating resistor, and heating resistor is connected with the temperature-controlled cabinet being positioned at Seal cage outside.
The invention has the beneficial effects as follows:
1. principle of the present invention is to Seal cage feeds air under pressure by pressurizing mechanism, gas again by collecting leakage chamber obtains leakage rate thus draws leak-down rate, wherein, leakage chamber is surrounded by pad, the first flange, the second flange, seal ring and rigid pipe, the non-tight face that seal ring is positioned at the first flange and the second flange does not at all affect the stressed of pad, rigid pipe and bolt just play the effect (identical with Bolted Flanged Connection) of compression, and test result is truer.
2. positioning groove also serves and prevents from deflecting excessive effect except giving Bolt to position, and effect is identical with conventional Bolted Flanged Connection.
3. the size of the first flange or the strain of the second flange is shown by computer and dynamic strainometer, the angle of yaw of flange is in the process derived by the relation of flange hoop strain and angular rotation of flange, structure is simple, and cost is low, is convenient to the relation of statistics and analysis angle of yaw and leak-down rate.
4. in existing leak-checking apparatus, the gas collected in chamber of leaking hunting directly passes into mass spectrometer detector and measures after cooling, metric results is accurate not, the present invention adds buffer cell, play the effect of steady air flow adjustable pressure, cooling chamber is used for cooling, and the humidity increased after cooling is processed by drying room, final arrival mass spectrometer detector, measuring accuracy is higher.
5. Expanded graphite Composition spacer has good anticorrosive property, resistance to high/low temperature, good compression resilience and high strength, is pad comparatively conventional in pressurized container or pipeline, for test for leaks rate, meets concrete reality.
The easy installation and removal of 6.O type circle, can use under static and various moving condition, resistance to motion is little, high resilience, good seal performance.
Accompanying drawing explanation
Fig. 1 is the structural scheme of mechanism (in figure, dotted line represents the circuit being connected to computer) of the embodiment of the present invention.
Fig. 2 is the scheme of installation of foil gauge on the first flange (in figure, dotted line represents the circuit being connected to computer) in the embodiment of the present invention.
In figure: 1-lagging; 2-leaks hunting pipeline; 3-heating resistor; 4-packing ring; 5-bolt; 6-rigid pipe; 7-seal ring; 8-foil gauge; 9-first flange; 10-pad; 11-second flange; 12-thermocouple; 13-valve; 14-temperature-controlled cabinet; 15-dynamic strainometer; 16-pressure gauge; 17-pressure regulator valve; 18-computer; 19-buffer cell; 20-gas holder; 21-Decompression valves; 22-thermometer; 23-cooling chamber; 24-drying room; 25-mass spectrometer detector; 26-blind plate.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1, a kind of leak-checking apparatus of Flanged Joints at Elevated Temperature, comprise two pipelines 2 that leak hunting, the first flange 9 that the pipeline 2 that leaks hunting two connects and the second flange 11, be located at pad 10, heating machanism, pressurizing mechanism between the first flange 9 and the second flange 11 sealing surface, the front of motor equal (by blind plate 26) of two pipelines 2 that leak hunting is closed and forms Seal cage in inside, heating machanism is located in Seal cage, and pressurizing mechanism carries gas to Seal cage, the outside cover of the first flange 9 and the second flange 11 has the rigid pipe 6 of annular, two place's annular grooves are provided with inside rigid pipe 6, seal ring 7 is equipped with in annular groove, two seal rings 7 respectively with the side close contact of the first flange 9 and the second flange 11, rigid pipe 6 is provided with some opposing connections and leaks hunting the equally distributed tapped through hole of pipeline 2, every double thread through hole is all symmetrical about pad 10, each tapped through hole is provided with between a bolt 5(bolt 5 and rigid pipe 6 and is provided with packing ring 4), first flange 9 and the cooperation of the second flange 11 hold out against by often pair of bolt 5 respectively, pad 10, first flange 9, second flange 11, seal ring 7 and rigid pipe 6 surround the chamber of leaking hunting of sealing, chamber of leaking hunting is connected with mass spectrometer detector 25 by pipeline.
Principle of the present invention is to Seal cage feeds air under pressure by pressurizing mechanism, gas again by collecting leakage chamber obtains leakage rate thus draws leak-down rate, wherein, leakage chamber is surrounded by pad 10, first flange 9, second flange 11, seal ring 7 and rigid pipe 6, the non-tight face that seal ring 7 is positioned at the first flange 9 and the second flange 11 does not at all affect the stressed of pad 10, rigid pipe 6 and bolt 5 just play the effect (identical with Bolted Flanged Connection) of compression, and test result is truer.
As shown in Figure 1, in the present embodiment, the first flange 9 and the second flange 11 are equipped with positioning groove with bolt 5 contacting point, and bolt 5 is positioned at positioning groove.Positioning groove also serves and prevents from deflecting excessive effect except giving bolt 5 location, and effect is identical with conventional bolt 5 Flange joint.
As depicted in figs. 1 and 2, in the present embodiment, the first flange 9 (or second flange 11) hoop is evenly distributed with foil gauge 8, and foil gauge 8 is connected with dynamic strainometer 15 and computer 18 successively.The first flange 9(or the second flange 11 is shown by computer 18 and dynamic strainometer 15) size that strains, the angle of yaw of flange is in the process derived by the relation of flange hoop strain and angular rotation of flange, structure is simple, and cost is low, is convenient to the relation of statistics and analysis angle of yaw and leak-down rate.
As shown in Figure 1, in the present embodiment, leak hunting on pipeline that chamber is connected with mass spectrometer detector 25 from the one end in chamber of leaking hunting, be provided with buffer cell 19, cooling chamber 23 and drying room 24 successively, buffer cell 19 is provided with pressure gauge 16, cooling chamber 23 is provided with thermometer 22, leak hunting between chamber and buffer cell 19, between cooling chamber 23 and drying room 24, between drying room 24 and mass spectrometer detector 25 and be equipped with valve 13, between buffer cell 19 and cooling chamber 23, be provided with pressure regulator valve 17.In existing leak-checking apparatus, the gas collected in chamber of leaking hunting directly passes into mass spectrometer detector 25 and measures after cooling, metric results is accurate not, the present invention adds buffer cell 19, play the effect of steady air flow adjustable pressure, cooling chamber 23 is for cooling, and the humidity increased after cooling is processed by drying room 24, final arrival mass spectrometer detector 25, measuring accuracy is higher.
In the present embodiment, the gas in gas holder 20 is helium, and Mass spectrometer leak detector is helium mass spectrometer leak detector.Adopt helium as the gas in gas holder 20, be heated to high temperature and can not produce danger, safe and reliable and also be convenient to detect.
In the present embodiment, pad 10 adopts Expanded graphite Composition spacer 10.Expanded graphite Composition spacer 10 has good anticorrosive property, resistance to high/low temperature, good compression resilience and high strength, is pad 10 comparatively conventional in pressurized container or pipeline, for test for leaks rate, meets concrete reality.
In the present embodiment, seal ring 7 adopts O type circle.The easy installation and removal of O type circle, can use under static and various moving condition, resistance to motion is little, high resilience, good seal performance.
As shown in Figure 1, in the present embodiment, the first flange 9 and the second flange 11 are respectively equipped with thermocouple 12, and the end of probe of thermocouple 12 is positioned at Seal cage, delivery end is connected with computer 18.Thermocouple 12 is for measuring and feeding back the temperature sealing intracavity gas.
As shown in Figure 1, in the present embodiment, pressurizing mechanism comprises gas holder 20, gas holder 20 is communicated with Seal cage (gas holder 20 is provided with pressure gauge 16 and Decompression valves 21) by pipeline, and connection gas holder 20 and the pipeline of Seal cage are provided with pressure regulator valve 17, pressure gauge 16 and valve 13 successively from gas holder 20 one end.Pressure gauge 16 on pipeline reflects the pressure of input sealing intracavity gas, and the pressure regulator valve 17 on pipeline is for regulating the pressure of input sealing intracavity gas, and valve 13 plays on-off action.
As shown in Figure 1, in the present embodiment, heating machanism comprises heating resistor 3, and heating resistor 3 is connected with the temperature-controlled cabinet 14 being positioned at Seal cage outside.
The workflow of the embodiment of the present invention is:
1) all valves 13 and pressure regulator valve 17 is closed.
2) regulated the temperature of heating resistor 3 by temperature-controlled cabinet 14, and monitored the temperature in Seal cage by thermocouple 12, when after temperature stabilization in Seal cage, pipeline, the first flange 9, second flange 11, rigidity part and thermocouple 12 are enclosed within lagging 1.
3) open the valve 13 between gas holder 20 and Seal cage, regulate pressure regulator valve 17 according to the pressure gauge 16 on pipeline, observe and the data of logger computer 18 upper flange hoop strain.
4) valve 13 leaked hunting between chamber and buffer cell 19 is opened, the gas leaked enters in buffer cell 19 by chamber of leaking hunting, the pressure of buffer cell 19 internal leakage gas is monitored by pressure gauge 16, after gas pressure is stable, regulate the pressure regulator valve 17 between buffer cell 19 and cooling chamber 23, gas leakage is made to enter cooling in cooling chamber 23, the temperature of cooling chamber 23 internal leakage gas is monitored by thermometer 22, the valve 13 between cooling chamber 23 and drying room 24 is opened after cooling, gas leakage is entered in drying room 24 and carries out drying, after gas drying, open the valve 13 between drying room 24 and mass spectrometer detector 25, gas leakage enters mass spectrometer detector 25, the leakage rate of monitoring leakage gas is carried out by mass spectrometer detector 25, concrete leak-down rate is determined divided by the total amount being filled with sealing intracavity gas by leakage rate.
5) under different temperature and pressures, above-mentioned experiment is repeated.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (10)
1. the leak-checking apparatus of a Flanged Joints at Elevated Temperature, comprise two pipelines that leak hunting, the first flange that two pipelines that leak hunting are connected and the second flanges, be located at the pad between the first flange and the second flange facing, heating machanism, pressurizing mechanism, the front of motor of two pipelines that leak hunting all is closed and forms Seal cage in inside, heating machanism is located in Seal cage, pressurizing mechanism carries gas to Seal cage, it is characterized in that: the outside cover of the first flange and the second flange has the rigid pipe of annular, two place's annular grooves are provided with inside rigid pipe, seal ring is equipped with in annular groove, two seal rings respectively with the side close contact of the first flange and the second flange, rigid pipe is provided with some opposing connections and leaks hunting the equally distributed tapped through hole of pipeline, every double thread through hole is all symmetrical about pad, each tapped through hole is provided with a bolt, first flange and the cooperation of the second flange hold out against by often pair of bolt respectively, pad, first flange, second flange, seal ring and rigid pipe surround the chamber of leaking hunting of sealing, chamber of leaking hunting is connected with mass spectrometer detector by pipeline.
2. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, is characterized in that: the first flange and the second flange and threaded bolt contacts place are equipped with positioning groove, and bolt is positioned at positioning groove.
3. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, is characterized in that: the first flange or the second flange ring are upwards evenly distributed with foil gauge, and foil gauge is connected with dynamic strainometer and computer successively.
4. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, it is characterized in that: the pipeline that chamber of leaking hunting is connected with mass spectrometer detector is provided with buffer cell, cooling chamber and drying room successively from the one end in chamber of leaking hunting, buffer cell is provided with pressure gauge, cooling chamber is provided with thermometer, leak hunting between chamber and buffer cell, between cooling chamber and drying room, between drying room and mass spectrometer detector and be equipped with valve, between buffer cell and cooling chamber, be provided with pressure regulator valve.
5. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, is characterized in that: pad is Expanded graphite Composition spacer.
6. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, is characterized in that: seal ring is O type circle.
7. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, is characterized in that: the first flange and the second flange are respectively equipped with thermocouple, and the end of probe of thermocouple is positioned at Seal cage, delivery end is connected with computer.
8. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, it is characterized in that: pressurizing mechanism comprises gas holder, gas holder is communicated with Seal cage by pipeline, and the pipeline of connection gas holder and Seal cage is provided with pressure regulator valve, pressure gauge and valve successively from gas holder one end.
9. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 8, it is characterized in that: the gas in gas holder is helium, Mass spectrometer leak detector is helium mass spectrometer leak detector.
10. the leak-checking apparatus of Flanged Joints at Elevated Temperature as claimed in claim 1, it is characterized in that: heating machanism comprises heating resistor, heating resistor is connected with the temperature-controlled cabinet being positioned at Seal cage outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009935.5A CN105423018B (en) | 2016-01-08 | 2016-01-08 | The leak-checking apparatus of Flanged Joints at Elevated Temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009935.5A CN105423018B (en) | 2016-01-08 | 2016-01-08 | The leak-checking apparatus of Flanged Joints at Elevated Temperature |
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| CN105423018A true CN105423018A (en) | 2016-03-23 |
| CN105423018B CN105423018B (en) | 2018-12-14 |
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| CN201610009935.5A Expired - Fee Related CN105423018B (en) | 2016-01-08 | 2016-01-08 | The leak-checking apparatus of Flanged Joints at Elevated Temperature |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673966A (en) * | 2016-04-22 | 2016-06-15 | 武汉工程大学 | Leakage protection and monitoring system for high-temperature flange |
| CN105715890A (en) * | 2016-04-22 | 2016-06-29 | 武汉工程大学 | Leakage monitoring system of quickly disassembled flange |
| CN105758785A (en) * | 2016-05-06 | 2016-07-13 | 上海核工程研究设计院 | Test device for verifying performance of pressure bearing container sealing rings |
| CN105928669A (en) * | 2016-04-22 | 2016-09-07 | 武汉工程大学 | Flange connection leakage early warning device |
| CN109765005A (en) * | 2019-03-05 | 2019-05-17 | 徐正强 | It leaks hunting and keeps the temperature case apparatus |
| CN109916574A (en) * | 2019-03-28 | 2019-06-21 | 江苏核电有限公司 | A kind of sealing of power station water system vessel flange and test simulator |
| CN111829731A (en) * | 2020-07-23 | 2020-10-27 | 中国原子能科学研究院 | Test device and method for verifying sealing performance of flange connection |
| CN114636522A (en) * | 2022-03-30 | 2022-06-17 | 武汉工程大学 | External heating ultra-high temperature flange sealing performance detection system |
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|---|---|---|---|---|
| CN105673966A (en) * | 2016-04-22 | 2016-06-15 | 武汉工程大学 | Leakage protection and monitoring system for high-temperature flange |
| CN105715890A (en) * | 2016-04-22 | 2016-06-29 | 武汉工程大学 | Leakage monitoring system of quickly disassembled flange |
| CN105928669A (en) * | 2016-04-22 | 2016-09-07 | 武汉工程大学 | Flange connection leakage early warning device |
| CN105758785A (en) * | 2016-05-06 | 2016-07-13 | 上海核工程研究设计院 | Test device for verifying performance of pressure bearing container sealing rings |
| CN109765005A (en) * | 2019-03-05 | 2019-05-17 | 徐正强 | It leaks hunting and keeps the temperature case apparatus |
| CN109916574A (en) * | 2019-03-28 | 2019-06-21 | 江苏核电有限公司 | A kind of sealing of power station water system vessel flange and test simulator |
| CN109916574B (en) * | 2019-03-28 | 2024-07-16 | 江苏核电有限公司 | Flange sealing and detection simulation device for power station water system equipment |
| CN111829731A (en) * | 2020-07-23 | 2020-10-27 | 中国原子能科学研究院 | Test device and method for verifying sealing performance of flange connection |
| CN111829731B (en) * | 2020-07-23 | 2022-03-11 | 中国原子能科学研究院 | Test device and method for verifying sealing performance of flange connection |
| CN114636522A (en) * | 2022-03-30 | 2022-06-17 | 武汉工程大学 | External heating ultra-high temperature flange sealing performance detection system |
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| CN105423018B (en) | 2018-12-14 |
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