CN205065288U - Large -scale low temperature liquid tank with multiple instrument detects protection - Google Patents
Large -scale low temperature liquid tank with multiple instrument detects protection Download PDFInfo
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- CN205065288U CN205065288U CN201520762735.8U CN201520762735U CN205065288U CN 205065288 U CN205065288 U CN 205065288U CN 201520762735 U CN201520762735 U CN 201520762735U CN 205065288 U CN205065288 U CN 205065288U
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- inside groove
- thermal resistance
- resistance thermometer
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Abstract
The utility model discloses a large -scale low temperature liquid tank with multiple instrument detects protection, its structure be on the side of inside groove with bottom plate center and bottom plate under, the bottom plate center of water jacket and bottom plate down and the inside groove at inside groove top breathe and all establish the hot resistance thermometer of platinum on the pipeline, establish intermediate layer pressure in the intermediate layer and show the teletransmission device, establish inside groove pressure on the inside groove and show teletransmission device and inside groove liquid level switches teletransmission device, breathe the middle and upper portion of pipeline with the inside groove on the BOG recovery tube at inside groove top and establish low temperature pneumatic control valve, establish the low temperature quick action emergency valve on the pressure boost pipeline of inside groove, the inside groove is breathed the pipeline middle part and is connected the tonifying qi pipeline, and the inside groove is breathed the pipeline lower part and is established the tonifying qi valve, establishes the low temperature quick action emergency valve on the feed liquor pipeline at on the positive displacement pump pipeline of the bottom of inside groove and inside groove top. The utility model discloses an advantage: 1 ) pressure range in the ability effective control storage tank prevents the explosion of storage tank superpressure, 2 )Have temperature, pressure, the multiple detection of liquid level protection, ensure storage tank safety, 3 )Multiple instrument shows, and is directly perceived reliable, 4 )Be applicable to multiple storage medium, the usage is extensive.
Description
Technical field
The utility model relates to a kind of large-scale low-temperature liquid storage groove with multiple instrument detection protection.
Background technique
Large-scale low-temperature liquid storage groove, particularly also belongs to the situation of inflammable and explosive medium (as: LNG Liquefied natural gas LNG) at storage medium, have very high requirement to the safety of equipment,
LNG is under 101.325KPa, and its saturation temperature is-162 DEG C, is cryogenic liquid.Its Main Ingredients and Appearance is methane, also has other compositions compositions such as a small amount of ethane, propane and nitrogen.LNG has purposes widely: for the main source of the gas of big and medium-sized cities gas supply conduit, community gasification; The peak load of urban pipe network air feed and accident peak regulation; Automobile, aircraft fuel; Cold energy use etc.
LNG is when gasifying as gas, and volume can undergoes rapid expansion.0 DEG C, under 101.325KPa, 1 liter of liquid is just annoying turns to 625 liters of gases.In airtight storage tank, because volumetric expansion makes pressure raise, when the indices of storage tank accurately can not be grasped, storage tank superpressure is very easily caused to explode.Prior art also cannot grasp the indices of regulation and control large-scale low-temperature liquid storage groove completely, cannot ensure the safety of storage tank.
Model utility content
The utility model proposes a kind of large-scale low-temperature liquid storage groove with multiple instrument detection protection; its object is intended to the above-mentioned blank filling up prior art existence; adopt maltilevel security protective measure; have to cryogenic liquide level gauging in storage tank the detection device adopting different principle of measurement for solving; accurately can judge liquid level, in order to avoid there is the phenomenon of erroneous judgement misoperation.Also have groove internal pressure detection device, and temperature monitoring point in groove, completely storage tank internal state can be detected timely, accurate judgement is made to internal condition.
Technical solution of the present utility model: there is the large-scale low-temperature liquid storage groove that multiple instrument detects protection, its structure comprises inside groove, water jacket and interlayer, inside groove is established in water jacket, it is interlayer between inside groove and water jacket, also comprise the first platinum thermal resistance thermometer, second platinum thermal resistance thermometer, 3rd platinum thermal resistance thermometer, 4th platinum thermal resistance thermometer, interlayer pressure display remote transmission device, inside groove pressure display remote transmission device, inside groove liquid level display remote transmission device, first low temperature pneumatic control valve, second low temperature pneumatic control valve, first low temperature Emergeny Cutoff Valves, second low temperature Emergeny Cutoff Valves, 3rd low temperature Emergeny Cutoff Valves, inside groove corrugated hose, BOG recovery tube, pressurization system, tonifying Qi pipeline, positive displacement pump pipeline, feed liquor pipeline, the side of described inside groove is established the first platinum thermal resistance thermometer, the base plate center of inside groove and base plate divide into the second platinum thermal resistance thermometer, the base plate center of water jacket and base plate divide into the 3rd platinum thermal resistance thermometer, the top of inside groove connects inside groove corrugated hose, and the 4th platinum thermal resistance thermometer is established on inside groove corrugated hose top, establish interlayer pressure to show remote transmission device in interlayer, inside groove is established 2 cover inside groove pressure display remote transmission devices and 2 cover inside groove liquid level display remote transmission devices, the top of inside groove connects BOG recovery tube, and BOG recovery tube is established the first low temperature pneumatic control valve, the second low temperature pneumatic control valve is established in inside groove corrugated hose middle and upper part, inside groove is connected with pressurization system by pressure pipeline, pressure pipeline is established the first low temperature Emergeny Cutoff Valves, tonifying Qi pipeline is connected in the middle part of inside groove corrugated hose, tonifying Qi valve is established in inside groove corrugated hose bottom, the bottom connected drainage pump line line of inside groove, positive displacement pump pipeline is established the second low temperature Emergeny Cutoff Valves, the top of inside groove connects feed liquor pipeline, feed liquor pipeline is established the 3rd low temperature Emergeny Cutoff Valves.
Preferably, the first described platinum thermal resistance thermometer is totally 14 covers, sets gradually 7 circles from top to bottom on inside groove side, often encloses 2 covers; The second described platinum thermal resistance thermometer is totally 7 covers, arranges 1 cover, inside groove base plate divides into and put 2 circles and often enclose 3 covers at inside groove base plate center; The 3rd described platinum thermal resistance thermometer is totally 4 covers, and trough floor center arranges 1 cover outside, outer trough floor divides into and put 1 circle and often enclose 3 covers; The 4th described platinum thermal resistance thermometer is totally 1 cover.
Preferably, the first described platinum thermal resistance thermometer, the second platinum thermal resistance thermometer, the 3rd platinum thermal resistance thermometer and the 4th platinum thermal resistance thermometer are two formula platinum thermal resistance thermometers, go out storage tank access explosion-proof wiring box through DN65 galvanized pipe during the cryocable of the first platinum thermal resistance thermometer, the second platinum thermal resistance thermometer, the 3rd platinum thermal resistance thermometer and the 4th platinum thermal resistance thermometer converges, this explosion-proof wiring box is established one piece of multiplex inspector.
Preferably, described interlayer pressure display remote transmission device comprises A pressure transmitter and ± 1.5KPa film resultant pressure table, and the signal end of A pressure transmitter connects with the signal end of DCS central control chamber.
Preferably, described inside groove pressure display remote transmission device comprises B pressure transmitter and 0 ~ 25KPa film resultant pressure table, and the signal end of B pressure transmitter connects with the signal end of DCS central control chamber.
Preferably, described inside groove liquid level display remote transmission device comprises differential pressure transmitter and the liquid location display, and the signal end of differential pressure transmitter connects with the signal end of DCS central control chamber.
Preferably, described water jacket is established water jacket bleeder valve.
Preferably, described water jacket is established water jacket inhalation valve.
Preferably, described inside groove connects 2 inside groove inhalation valves by A pipeline, and 2 inside groove inhalation valves connect inside groove corrugated hose middle and upper part by B pipeline.
Advantage of the present utility model: 1) effectively can control storage tank internal pressure scope, prevents storage tank superpressure from exploding; 2) there is temperature, pressure, the protection of liquid level Multiple detection, guarantee storage tank safety; 3) multiple instrument display, intuitive and reliable; 4) multiple storage medium is applicable to, of many uses.
Accompanying drawing explanation
Fig. 1 has the structural representation that multiple instrument detects the large-scale low-temperature liquid storage groove of protection.
In figure 1 is inside groove, 2 is water jackets, 3 is interlayers, 4 is first platinum thermal resistance thermometers, 5 is second platinum thermal resistance thermometers, 6 is the 3rd platinum thermal resistance thermometers, 7 is the 4th platinum thermal resistance thermometers, 8 is interlayer pressure display remote transmission devices, 9 is inside groove pressure display remote transmission devices, 10 is inside groove liquid level display remote transmission devices, 11 is water jacket bleeder valves, 12 is water jacket inhalation valves, 13 is inside groove inhalation valves, 14 is first low temperature pneumatic control valves, 15 is second low temperature pneumatic control valves, 16 is first low temperature Emergeny Cutoff Valvess, 17 is second low temperature Emergeny Cutoff Valvess, 18 is the 3rd low temperature Emergeny Cutoff Valvess, 19 is inside groove corrugated hoses, 20 is BOG recovery tubes, 21 is pressurization systems, 22 is tonifying Qi pipelines, 23 is positive displacement pump pipelines, 24 is feed liquor pipelines, a represent input that LNG, b represent that test run liquid nitrogen enters, c represents sealing by liquefaction plant district and purge nitrogen, d represents the tonifying Qi of storage tank making-up air device, e represents that entrucking BOG returns storage tank, f represent Loading Pump after backflow, g represent that Loading Pump purges nitrogen, h represent to BOG reclaiming system, i represent LNG Loading Pump, j represents emptying on the spot.
Embodiment
Below in conjunction with embodiment and embodiment, the utility model is described in further detail.
As shown in Figure 1, there is the large-scale low-temperature liquid storage groove that multiple instrument detects protection, its structure comprises inside groove 1, water jacket 2 and interlayer 3, inside groove 1 is established in water jacket 2, it is interlayer 3 between inside groove 1 and water jacket 2, also comprise the first platinum thermal resistance thermometer 4, second platinum thermal resistance thermometer 5, 3rd platinum thermal resistance thermometer 6, 4th platinum thermal resistance thermometer 7, interlayer pressure display remote transmission device 8, inside groove pressure display remote transmission device 9, inside groove liquid level display remote transmission device 10, first low temperature pneumatic control valve 14, second low temperature pneumatic control valve 15, first low temperature Emergeny Cutoff Valves 16, second low temperature Emergeny Cutoff Valves 17, 3rd low temperature Emergeny Cutoff Valves 18, inside groove corrugated hose 19, BOG recovery tube 20, pressurization system 21, tonifying Qi pipeline 22, positive displacement pump pipeline 23, feed liquor pipeline 24, the side of described inside groove 1 is established the first platinum thermal resistance thermometer 4, the base plate center of inside groove 1 and base plate divide into the second platinum thermal resistance thermometer 5, the base plate center of water jacket 2 and base plate divide into the 3rd platinum thermal resistance thermometer 6, the top of inside groove 1 connects inside groove corrugated hose 19, and the 4th platinum thermal resistance thermometer 7 is established on inside groove corrugated hose 19 top, establish interlayer pressure to show remote transmission device 8 in interlayer 3, inside groove 1 is established 2 cover inside groove pressure display remote transmission devices 9 and 2 overlap inside groove liquid level display remote transmission device 10, the top of inside groove 1 connects on BOG recovery tube 20, BOG recovery tube 20 establishes the first low temperature pneumatic control valve 14, and the second low temperature pneumatic control valve 15 is established in inside groove corrugated hose 19 middle and upper part, inside groove 1 is connected with pressurization system 21 by pressure pipeline, pressure pipeline is established the first low temperature Emergeny Cutoff Valves 16, tonifying Qi pipeline 22 is connected in the middle part of inside groove corrugated hose 19, tonifying Qi valve is established in inside groove corrugated hose 19 bottom, the bottom connected drainage pump line line 23 of inside groove 1, positive displacement pump pipeline 23 is established the second low temperature Emergeny Cutoff Valves 17, the top of inside groove 1 connects feed liquor pipeline 24, feed liquor pipeline 24 is established the 3rd low temperature Emergeny Cutoff Valves 18.
The first described platinum thermal resistance thermometer 4 is totally 14 covers, sets gradually 7 circles from top to bottom on inside groove 1 side, often encloses 2 covers; The second described platinum thermal resistance thermometer 5 is totally 7 covers, arranges 2 circles and often enclose 3 covers under inside groove 1 base plate center arranges 1 cover, inside groove 1 base plate; The 3rd described platinum thermal resistance thermometer 6 is totally 4 covers, arranges 1 circle and often enclose 3 covers under water jacket 2 base plate center arranges 1 cover, water jacket 2 base plate; The 4th described platinum thermal resistance thermometer 7 is totally 1 cover.
Described the first platinum thermal resistance thermometer 4, second platinum thermal resistance thermometer 5, the 3rd platinum thermal resistance thermometer 6 and the 4th platinum thermal resistance thermometer 7 are two formula platinum thermal resistance thermometers, storage tank access explosion-proof wiring box is gone out through DN65 galvanized pipe in the cryocable remittance of the first platinum thermal resistance thermometer 4, second platinum thermal resistance thermometer 5, the 3rd platinum thermal resistance thermometer 6 and the 4th platinum thermal resistance thermometer 7, this explosion-proof wiring box is established one piece of multiplex inspector, for each point for measuring temperature temperature of on-the-spot roll display.Totally 26 cover platinum thermal resistance thermometers form 26 points for measuring temperature can cycle detection display at the scene, and teletransmission carries out remote monitoring to DCS central control chamber.Inside groove point for measuring temperature in order to measure the situation of change of inside groove temperature in topping up and storage process, and inside and outside trough floor point for measuring temperature is in operation in order to monitor storage tank, and basis occurs with or without abnormal temperature, thus judges whether leak bottom inside groove.
Described interlayer pressure display remote transmission device 8 comprises A pressure transmitter and ± 1.5KPa film resultant pressure table, the signal end of A pressure transmitter connects with the signal end of DCS central control chamber, for monitoring interlayer nitrogen pressure, pressure signal is sent to DCS central control chamber by A pressure transmitter by interlayer nitrogen pressure, realizes the remote monitoring of DCS central control chamber.
Described inside groove pressure display remote transmission device 9 comprises B pressure transmitter and 0 ~ 25KPa film resultant pressure table, the signal end of B pressure transmitter connects with the signal end of DCS central control chamber, for monitoring inside groove gas pressure, pressure signal is sent to DCS central control chamber by B pressure transmitter by inside groove gas pressure, realizes the remote monitoring of DCS central control chamber.
Described inside groove liquid level display remote transmission device 10 comprises differential pressure transmitter and the liquid location display, the signal end of differential pressure transmitter connects with the signal end of DCS central control chamber, monitor for internal tank liquor position, differential pressure signal is sent to DCS central control chamber by differential pressure transmitter by inside groove liquid level, realizes the remote monitoring of DCS central control chamber.
The signaling line of described A pressure transmitter, B pressure transmitter transmitter and differential pressure transmitter is also through galvanized pipe and explosion-proof flexible tube access explosion-proof wiring box, and DCS central control system only need join all primary instrument signals that a multicore computer cable just can accept storage tank.
Described water jacket 2 is established water jacket bleeder valve 11 and water jacket inhalation valve 12.
Described inside groove 1 connects 2 inside groove inhalation valves, 13,2 inside groove inhalation valves 13 by A pipeline and connects inside groove corrugated hose 19 middle and upper part by B pipeline.
embodiment
5000 cubes of LNG storage tanks, design pressure: 25Kpa, design liquid level: 15915mm.
1, inside groove gaseous pressure detects
Two cover inside groove pressure display remote transmission devices, have the B pressure transmitter that two platform independent are run, the using and the reserved.Output signal: report to the police and interlock after the conversion of 4 ~ 20mADC, DCS central control chamber Received signal strength.
Inside groove pressure: 0 ~ 25Kpa, analogue signal;
Pressure height is reported to the police and is interlocked (PSH): > 18KPa;
High interlocking (PSHH): the 20KPa that reports to the police of pressure;
Low warning interlocking (PSL) of pressure: < 5KPa; DCS central control chamber rings alarm bell, and yellow alarm lamp glimmers.
When inside groove pressure raises, during higher than 18KPa, the first low temperature pneumatic control valve is opened, and this modulating valve is regulated by PID, and along with inside groove pressure constantly raises, valve opening is larger.Pressure is constant or decline, and valve opening is constant;
When inside groove pressure reduces, during lower than 10KPa, the first low temperature pneumatic control valve cuts out.
If after the first low temperature pneumatic control valve is opened entirely, inside groove pressure still continues to raise, and during higher than 20KPa, the second low temperature pneumatic control valve is opened, fast evacuation pressure release, inside groove pressure drop, when closing lower than the second low temperature pneumatic control valve during 18KPa;
If instead inside groove pressure reduces, when reaching 5KPa, the first low temperature Emergeny Cutoff Valves is opened, and pressurization system is to inside groove supercharging, and when pressure reaches 10KPa, the first low temperature Emergeny Cutoff Valves cuts out; If there is the situation of pressurization system supercharging deficiency, when inside groove gaseous pressure drops to 2KPa, tonifying Qi valve opening, the tonifying Qi of storage tank making-up air device, inside groove boosts, when pressure rises to 10KPa, tonifying Qi valve closing; If there is chance failure, when pressure continues to drop to-0.5KPa, inside groove inhalation valve air-breathing, the second low temperature Emergeny Cutoff Valves controlled in positive displacement pump pipeline cuts out and termination of pumping, stops discharge opeing.
2, inside groove level sensing:
0 ~ 10000mmH
2o analogue signal;
High (LAH): the 7426mmH that reports to the police
2o; DCS central control chamber rings alarm bell, and yellow alarm lamp glimmers.
High interlocking (LSHH): the 7480mmH that reports to the police
2o (design liquid level), during high warning, the 3rd low temperature Emergeny Cutoff Valves controlled in feed liquor pipeline cuts out, and stops feed liquor;
Low warning (LAL): 235mmH
2o, DCS central control chamber rings alarm bell, and yellow alarm lamp glimmers;
Low warning (LSLL): 140mmH
2o, during low warning, the second low temperature Emergeny Cutoff Valves controlled in positive displacement pump pipeline cuts out and termination of pumping, stops discharge opeing;
Floating-ball level switch: when liquid level reaches design liquid level, floating-ball level switch contact closure, the Emergeny Cutoff Valves that DCS system controls in liquid inlet pipe wire system cuts out, and stops feed liquor;
3, Temperature displaying, digital signal;
First platinum thermal resistance thermometer inside groove temperature :-200 ~+40 DEG C;
Second platinum thermal resistance thermometer internal groove bottom plate temperature :-200 ~+40 DEG C;
3rd platinum thermal resistance thermometer water jacket baseplate temp :-200 ~+40 DEG C;
4th platinum thermal resistance thermometer inside groove top expiring tube channel temp :-200 ~+600 DEG C.
Above-described is only preferred implementation of the present utility model; it should be pointed out that for the person of ordinary skill of the art, under the prerequisite not departing from the utility model creation design; can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (9)
1. have the large-scale low-temperature liquid storage groove that multiple instrument detects protection, its structure comprises inside groove (1), water jacket (2) and interlayer (3), inside groove (1) is established in water jacket (2), be interlayer (3) between inside groove (1) and water jacket (2), it is characterized in that also comprising the first platinum thermal resistance thermometer (4), second platinum thermal resistance thermometer (5), 3rd platinum thermal resistance thermometer (6), 4th platinum thermal resistance thermometer (7), interlayer pressure display remote transmission device (8), inside groove pressure display remote transmission device (9), inside groove liquid level display remote transmission device (10), first low temperature pneumatic control valve (14), second low temperature pneumatic control valve (15), first low temperature Emergeny Cutoff Valves (16), second low temperature Emergeny Cutoff Valves (17), 3rd low temperature Emergeny Cutoff Valves (18), inside groove corrugated hose (19), BOG recovery tube (20), pressurization system (21), tonifying Qi pipeline (22), positive displacement pump pipeline (23), feed liquor pipeline (24), the first platinum thermal resistance thermometer (4) is established in the side of described inside groove (1), the base plate center of inside groove (1) and base plate divide into the second platinum thermal resistance thermometer (5), the base plate center of water jacket (2) and base plate divide into the 3rd platinum thermal resistance thermometer (6), the top of inside groove (1) connects inside groove corrugated hose (19), and the 4th platinum thermal resistance thermometer (7) is established on inside groove corrugated hose (19) top, establish interlayer pressure to show remote transmission device (8) in interlayer (3), inside groove (1) is established 2 cover inside groove pressure display remote transmission device (9) and 2 covers inside groove liquid level display remote transmission device (10), the top of inside groove (1) connects BOG recovery tube (20), BOG recovery tube (20) is established the first low temperature pneumatic control valve (14), the second low temperature pneumatic control valve (15) is established in inside groove corrugated hose (19) middle and upper part, inside groove (1) is connected with pressurization system (21) by pressure pipeline, pressure pipeline is established the first low temperature Emergeny Cutoff Valves (16), inside groove corrugated hose (19) middle part connects tonifying Qi pipeline (22), tonifying Qi valve is established in inside groove corrugated hose (19) bottom, bottom connected drainage pump line line (23) of inside groove (1), positive displacement pump pipeline (23) is established the second low temperature Emergeny Cutoff Valves (17), the top of inside groove (1) connects feed liquor pipeline (24), feed liquor pipeline (24) is established the 3rd low temperature Emergeny Cutoff Valves (18).
2. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1, it is characterized in that described the first platinum thermal resistance thermometer (4) totally 14 covers, set gradually 7 circles from top to bottom on inside groove (1) side, often enclose 2 covers; Described the second platinum thermal resistance thermometer (5) is totally 7 covers, arranges 2 circles and often enclose 3 covers under inside groove (1) base plate center arranges 1 cover, inside groove (1) base plate; The 3rd described platinum thermal resistance thermometer (6) is totally 4 covers, arranges 1 circle and often enclose 3 covers under water jacket (2) base plate center arranges 1 cover, water jacket (2) base plate; The 4th described platinum thermal resistance thermometer (7) is totally 1 cover.
3. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1 or 2, it is characterized in that described the first platinum thermal resistance thermometer (4), second platinum thermal resistance thermometer (5), 3rd platinum thermal resistance thermometer (6) and the 4th platinum thermal resistance thermometer (7) are two formula platinum thermal resistance thermometers, first platinum thermal resistance thermometer (4), second platinum thermal resistance thermometer (5), storage tank access explosion-proof wiring box is gone out through DN65 galvanized pipe in the cryocable remittance of the 3rd platinum thermal resistance thermometer (6) and the 4th platinum thermal resistance thermometer (7), this explosion-proof wiring box is established one piece of multiplex inspector.
4. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1; it is characterized in that described interlayer pressure display remote transmission device (8) comprises A pressure transmitter and ± 1.5KPa film resultant pressure table, the signal end of A pressure transmitter connects with the signal end of DCS central control chamber.
5. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1; it is characterized in that described inside groove pressure display remote transmission device (9) comprises B pressure transmitter and 0 ~ 25KPa film resultant pressure table, the signal end of B pressure transmitter connects with the signal end of DCS central control chamber.
6. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1; it is characterized in that described inside groove liquid level display remote transmission device (10) comprises differential pressure transmitter and the liquid location display, the signal end of differential pressure transmitter connects with the signal end of DCS central control chamber.
7. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1, it is characterized in that described water jacket (2) establishes water jacket bleeder valve (11).
8. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1, it is characterized in that described water jacket (2) establishes water jacket inhalation valve (12).
9. there is large-scale low-temperature liquid storage groove that multiple instrument detects protection as claimed in claim 1; it is characterized in that described inside groove (1) connects 2 inside groove inhalation valves (13) by A pipeline, 2 inside groove inhalation valves (13) connect inside groove corrugated hose (19) middle and upper part by B pipeline.
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