CN106927353B - LNG storage tank tank inner tube pipe fitting method - Google Patents
LNG storage tank tank inner tube pipe fitting method Download PDFInfo
- Publication number
- CN106927353B CN106927353B CN201710248405.0A CN201710248405A CN106927353B CN 106927353 B CN106927353 B CN 106927353B CN 201710248405 A CN201710248405 A CN 201710248405A CN 106927353 B CN106927353 B CN 106927353B
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- China
- Prior art keywords
- tank
- interior conduit
- pulley
- tank interior
- lng storage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/02—Driving gear
- B66D1/14—Power transmissions between power sources and drums or barrels
- B66D1/20—Chain, belt, or friction drives, e.g. incorporating sheaves of fixed or variable ratio
Abstract
The invention belongs to LNG storage tank construction fields, and in particular to a kind of LNG storage tank tank inner tube pipe fitting method.There are construction time length, construction cost height and working at height risk when in order to solve the problem of to lift LNG storage tank tank interior conduit using the prior art, the invention discloses a kind of LNG storage tank tank inner tube pipe fitting methods.The LNG storage tank tank inner tube pipe fitting method is included in tank inside and carries out prefabricated, the installation to hanging device and arrangement, and the lifting by hoist engine to tank interior conduit to tank interior conduit.By using the LNG storage tank tank inner tube pipe fitting method of the present invention, it not only can be to avoid the risk of the progress height lifting operation outside storage tank, improve the safety of hoisting process, and by the way that the lifting of the primary completion to tank interior conduit may be implemented to the arrangement of hanging device in tank inside, to reduce the lifting time, lifting construction cost is reduced.
Description
Technical field
The invention belongs to LNG storage tank construction fields, and in particular to a kind of LNG storage tank tank inner tube pipe fitting method.
Background technology
During the installation of all LNG storage tanks, it can all be related to the installation for tank inside pipeline, such as needle
Installation to inlet tube, pump line and various gauge pipes.With 160,000 m3LNG storage tank for, the inner canister diameter of storage tank is about
80 meters, height of the tank inner bottom plating apart from abhiseca is about that more than 40 meters, wherein bottom liquid inlet pipe and pump line are erected in storage tank
Portion, and the outside of abhiseca is vertically extended to by tank inner bottom plating, the length of such bottom liquid inlet pipe and pump line is generally 40
Rice or so.
Currently, the installation for tank inside pipeline typically completes installation in the interior tank shell and storage tank dome of storage tank
Afterwards, by large-scale crane by tank interior conduit from the casing on dome by being lifted outside tank in tank, then complete the peace to tank interior conduit
It fills and fixed.This method lifted by crane does not require nothing more than the inside and outside construction personnel of storage tank and matches with hight coordinate
Conjunction ability, and during the high-altitude that pipeline is hung to more than 40 meters by large-scale crane is put into tank inside afterwards again, exist
Prodigious working at height risk.Wherein, to 160,000 m3When the inlet tube of LNG storage tank is lifted, due to be outdoors into
Row operation, and lifting operation radius is big, and hoisting height is high, therefore usually the crane of a 300T is selected to carry out lifting operation,
It just can guarantee the safety and stability of entire hoisting process.Further, since the length of bottom liquid inlet pipe and pump line is on 40 meters of left sides
The right side, and the total weight of bottom liquid inlet pipe reaches 14T or so, therefore can not once complete to bottom liquid inlet pipe during the installation process
Lifting, need the multiple round-trip lifting being segmented to pipeline, then pipeline carried out in layer again in tank inside
Stack welding.The construction time is not only considerably increased in this way, but also extends the usage time to large-scale crane, and then is increased
The construction cost of Pipe installing.
Invention content
When in order to solve to install the tank interior conduit of LNG storage tank using the prior art, there are construction time length, constructions
The problem of of high cost and working at height risk, the present invention propose a kind of LNG storage tank tank inner tube pipe fitting method.The LNG is stored up
Tank tank inner tube pipe fitting method, includes the following steps：
Step S1, prefabricated tanks interior conduit；It is prefabricated to the progress of tank interior conduit in tank inside, and in the upper of the tank interior conduit
At least two lifting lugs of end setting, the lifting lug are distributed on the outer surface of the tank interior conduit along the circumferencial direction of the tank interior conduit
On；
Step S2 installs hanging device；The hanging device includes hoist engine, first pulley, second pulley and pulley
Component；The hoist engine is located on tank inner bottom plating, and the first pulley is located at the connection position of the tank inner bottom plating and interior tank shell
It sets, the second pulley is located on the dome longeron of the interior tank shell, and the pulley assembly is located at and the tank inner tube
Road corresponds on the dome longeron of casing both sides；The rope that the hoist engine stretches out by extending to institute successively after the first pulley
State second pulley and the pulley assembly；By the hoist engine to the retractable operation of the rope, the pulley assembly is controlled
In pulley carry out raising and lowering；
Step S3 lifts tank interior conduit；The rope is dropped to by the tank inner bottom plating by the pulley assembly first
Near, and be fixedly connected with the lifting lug of tank interior conduit upper end；Then start hoist engine and recycle rope, it will be in the tank
Pipeline lift is to vertical state；Finally position is carried out to the tank interior conduit to fix.
Preferably, in the step S1, the lower end position of the tank interior conduit is additionally provided with slipping tail lifting lug.
It is further preferred that the hanging device further includes crane, the crane is connect with the slipping tail lifting lug, assists institute
The promotion that hoist engine is completed to the tank interior conduit is stated to operate.
Preferably, in the step S2, the pulley assembly includes a movable pulley and two fixed pulleys, wherein described
Movable pulley is equipped with suspension hook；Two fixed pulleys respectively casing both sides corresponding with the tank interior conduit dome longeron connection,
The movable pulley is located on the rope between two fixed pulleys, and perpendicular to the retractable operation edge of rope with the hoist engine
Histogram ramps up and declines.
It is further preferred that in the step S3, connected by steel wire rope between the lifting lug of tank interior conduit upper end,
It is connect again with the suspension hook on the movable pulley.
Preferably, the upper end of the tank interior conduit is equipped at least two auxiliary lifting lugs, and the tank interior conduit corresponds to casing two
The dome longeron of side is equipped at least two guide chains；When the hoist engine lifts the tank interior conduit to vertical state, and carry
When being raised near described sleeve pipe, the guide chain is connect with the auxiliary lifting lug, and the micro- of spatial position is carried out to the tank interior conduit
It adjusts.
It is further preferred that the upper end of the tank interior conduit is set, there are four assist lifting lug, the dome of described sleeve pipe both sides vertical
Liang Shangshe is set there are two floor stringer between the dome longeron of described sleeve pipe both sides there are two guide chain, and is set on each floor stringer
There are one guide chains.
It is further preferred that the distance between the auxiliary lifting lug and the upper end port of the tank interior conduit are more than the tank
Interior conduit stretches into the length in described sleeve pipe.
Preferably, the position height of the first pulley is identical as the rope height of the hoist engine.
Preferably, the second pulley is located at same vertical direction with the first pulley
LNG storage tank tank inner tube pipe fitting method using the present invention, installs the pipeline in LNG storage tank, have with
Lower advantageous effect：
1, the present invention by will in the prior art to the lifting of tank interior conduit operate, by by large-scale crane outside storage tank
The multiple round-trip lifting operations improvement being segmented is that primary lifting is carried out to tank interior conduit by hoist engine in tank inside
Operation.The upper air installing Job Operations carried out outside storage tank by large-scale crane are not only eliminated in this way, avoid high-altitude work
Existing security risk problem when industry, and tank inside by hoist engine can once complete pipeline lifting operate, greatly
The commander's difficulty and lifting time of the big height for reducing lifting operation and hoisting process, to improve lifting efficiency and
The safety of hoisting process.
2, in the present invention, by using the pulley assembly including two fixed pulleys and a movable pulley to tank interior conduit into
Row lifting, it is only the 1/3 of tank interior conduit total weight to make the active force that rope is finally born.It is not only greatly reduced in this way to lifting
The intensity requirement of equipment, reduces the use cost of hanging device, and further ensures the peace of tank interior conduit hoisting process
Full property and stability.
Description of the drawings
Fig. 1 is lifting schematic diagram when method using the present invention installs tank interior conduit；
Fig. 2 is the attachment structure schematic diagram between the directions F pulley assembly and tank interior conduit in Fig. 1.
Specific implementation mode
It describes in detail below in conjunction with the accompanying drawings to the technical solution in the present invention.
In conjunction with shown in Fig. 1 and Fig. 2, LNG storage tank tank inner tube pipe fitting method using the present invention pacifies tank interior conduit
Dress the specific steps are：
Step S1, prefabricated tanks interior conduit.It, will after completing installation to the interior tank shell 11 of storage tank 1 and storage tank dome 12
All segmented conduits of tank interior conduit 2 are carried to the inside of storage tank 1.Prefabricated work is carried out to tank interior conduit 2 on tank inner bottom plating 13
Make, and the tank interior conduit 2 for completing prefabricated work is lain in a horizontal plane on tank inner bottom plating 13.In this way, by the ground to overlength
Pipeline carries out prefabricated work, can reduce operation difficulty, the prefabricated efficiency of pipeline and prefabricated precision be improved, to ensure pipeline
Prefabricated quality.In addition, in the prefabrication process for carrying out tank interior conduit 2, hung in the upper end position setting at least two of tank interior conduit 2
Ear 21, and lifting lug 21 is along the outer surface that the circumferencial direction of tank interior conduit 2 is distributed on tank interior conduit 2.In the present invention, in tank
Fixed by welding on the external peripheral surface of interior conduit 2 there are two lifting lugs 21, and two lifting lugs 21 are located at tank inner tube
The both ends of 2 same diameter of road.It equally, can be in tank inner tube according to the weight of other tank interior conduits and the intensity of selection lifting lug
More lifting lugs 21 are arranged in the upper end circumferencial direction in road 2, to reduce the active force that each lifting lug 21 is born, ensure in tank
The stability of 2 hoisting process of pipeline and safety.
Step S2 installs hanging device.Hanging device includes hoist engine 31, first pulley 32, second pulley 33 and slides
Wheel assembly 34.Wherein, hoist engine 31 is fixedly mounted on tank inner bottom plating 13, and first pulley 32 is located at tank inner bottom plating 13 and interior tank skin
The link position of plate 11, second pulley 33 are located on the dome longeron of interior tank shell 11, and pulley assembly 34 is located at casing 4
Lower position, and be fixedly connected with the dome longeron 121 of 4 both sides of casing.Casing 4 is one section of pipeline for running through dome 12, both may be used
For wearing tank interior conduit 2, and protection is carried out to tank interior conduit 2 and position is fixed, such as corresponding with gauge pipe and pump line
Casing；Can be used for docking with tank interior conduit 2, realize tank interior conduit 2 and the connection outside storage tank 1, for example, with inlet tube
Corresponding casing.
Preferably, in the present invention, hoist engine 31 is fixed in tank inner bottom plating 13 close to the position of interior tank shell 11, this
Sample can reduce occupancy of the hoist engine 31 to 13 intermediate region of tank inner bottom plating, in order to there is the space of bigger for prefabricated and placement
Tank interior conduit 2.First pulley 32 is fixed on the anchoring lifting lug of tank inner bottom plating 13 and 11 link position of interior tank shell, and
The rope 311 that the height and position of first pulley 32 is stretched out with hoist engine 31 is in same level height, can make hoist engine in this way
Rope 311 between 31 and first pulley 32 keeps horizontality.In this way, in hoisting process, can make hoist engine 31 by
The pulling force of rope 311 is maintained at horizontality, ensures that stablizing for hoist engine 31 is fixed.Second pulley 33 is located at first pulley 32
Surface makes rope 311 between the two keep vertical state.
In the present invention, pulley assembly 34 includes two fixed pulleys 341 and a movable pulley 342, two of which fixed pulley
341 are separately fixed on the dome longeron 121 of 4 both sides of casing, and movable pulley 342 is located at the rope 311 between two fixed pulleys 341
On.Along with the retractable operation of rope 311, movable pulley 342 vertically carries out raising and lowering.In addition, in movable pulley 342
On set there are one suspension hook, be fixedly connected for the upper end to tank interior conduit 2.
The rope 311 that hoist engine 31 stretches out, it is horizontally extending first at first pulley 32, then pass around the first cunning
Wheel 32 simultaneously extends to second pulley 33 along the vertical direction of interior tank shell 11, then extends to pulley assembly around second pulley 33
34.In pulley assembly 34, rope 311 first passes around two fixed pulleys 341, is then fixedly connected with movable pulley 342, and will move
Pulley 342 is placed on the rope between two fixed pulleys 341.In this way, being promoted to tank interior conduit 2 by the pulley assembly 34
When lifting, it is only necessary to apply the active force of about 2 weight 1/3 of tank interior conduit to rope 311, you can to realize to tank interior conduit
2 promotion operation reduces construction cost to substantially reduce the job requirement to hanging device.Wherein, to 160,000 m3LNG
When the maximum bottom liquid inlet pipe of weight is lifted in storage tank, it is only necessary to select the hoist engine of a 5T that can realize to bottom
The lifting of inlet tube operates.
Step S3 lifts tank interior conduit.It first, will be positioned at two lifting lugs of 2 upper end position of tank interior conduit by steel wire rope
21 are attached, and tie point is placed in the nozzle position directly above of tank interior conduit 2.Then, start hoist engine 31, to rope
311 carry out release operation, and the movable pulley 342 equipped with suspension hook is dropped near tank inner bottom plating 13.It then, will be on movable pulley 342
Suspension hook and the tie point position of steel wire rope be fixedly connected, and be again started up hoist engine 31, recycling behaviour carried out to rope 311
Make, movable pulley 342 is driven to rise, and then tank interior conduit 2 is promoted to vertical state by horizontal positioned state, and by tank interior conduit
2 are aligned with casing 4.Finally, position is carried out to tank interior conduit 2 to fix.If it is inlet tube, then by the end portion of inlet tube with
Tank inner bottom plating 13 carries out position and fixes.The pipeline across casing 4, such as gauge pipe are needed if it is other, then by the upper of pipeline
End part is welded and fixed with corresponding casing 4.
Preferably, it is additionally provided with slipping tail lifting lug 22 in the lower end position of tank interior conduit 2.At this point, in hoist engine 31 to tank inner tube
Before road 2 is lifted, a truck crane 35 is opened into the inside into storage tank 1, and be attached with slipping tail lifting lug 22.Wherein, for
160000 m3The inlet tube lifting operation of LNG storage tank, selects the truck crane of a 25T that can meet auxiliary lifting requirements.In this way,
During carrying out being promoted to vertical state by horizontal positioned state to tank interior conduit 2 by hoist engine 31, by truck crane
The lower end of 35 pairs of tank interior conduits 2 carries out service hoisting, to avoid tank interior conduit 2 from dawdling and collide with tank inner bottom plating 13.
Meanwhile along with the position height of tank interior conduit 2 and between storage tank bottom plate 13 angle continuous variation, vapour can also be passed through
Vehicle hangs the real-time movement of 35 positions, is in time adjusted to the variation of 2 lower end position of tank interior conduit, and tank interior conduit 2 is avoided to send out
Raw the problem of freely swinging and colliding with tank inside other equipment, to ensure tank interior conduit 2 in hoisting process
Stability and safety.
In addition, when method using the present invention is to needing to install with the casing progress fixed tank interior conduit in position.
First, in the prefabrication process of tank interior conduit, in at least two auxiliary lifting lug of upper end position setting of tank interior conduit.Wherein, auxiliary
Distance between lifting lug and the upper end port of tank interior conduit is helped to be greater than the length that tank interior conduit stretches into casing, in order to pass through guide chain
The length that inside pipe casing is stretched into tank interior conduit is controlled and is adjusted.Meanwhile be arranged on the dome longeron near casing to
Few two chain slings.Then, after tank interior conduit is promoted to the lower position of casing by hoist engine, guide chain and auxiliary lifting lug are carried out
Connection, and remove the connection between pulley assembly and lifting lug.Then, promotion and the sky of height are carried out to tank interior conduit by guide chain
Between position adjustment, make tank interior conduit keep vertical state and being aligned with the central axis of casing.Finally, make in the auxiliary of guide chain
Under, the position completed between tank interior conduit and casing is fixed.Preferably, four auxiliary hangings are set in the upper end of tank interior conduit
Ear, and four auxiliary lifting lugs are uniformly distributed along the circumferencial direction of tank interior conduit.Meanwhile two being arranged between the longeron of casing both sides
A guide chain is respectively set on two longerons and two floor stringers, the auxiliary lifting lug for connecting corresponding position in floor stringer.This
Sample can be finely adjusted the position of tank interior conduit and angle, ensure tank interior conduit when tank interior conduit is fixedly connected with casing
The stabilization of position.
In addition, when being installed under different operating modes, according to the weight of tank interior conduit and the intensity of hanging device, such as
Reinforcing beam can be arranged and to pulley blocks in the intensity of the tensile strength of rope and single lifting lug between the longeron of casing both sides
Pulley quantity and pulley combination mode in part carry out adjustment appropriate, to reduce the pulling force of rope, ensure to tank inner tube
The safety and stability of road installation process.
Claims (10)
1. a kind of LNG storage tank tank inner tube pipe fitting method, which is characterized in that the installation method includes the following steps：
Step S1, prefabricated tanks interior conduit；It is prefabricated to the progress of tank interior conduit in tank inside, and set in the upper end of the tank interior conduit
At least two lifting lugs are set, the lifting lug is along the outer surface that the circumferencial direction of the tank interior conduit is distributed on the tank interior conduit；
Step S2 installs hanging device；The hanging device includes hoist engine, first pulley, second pulley and pulley assembly；
The hoist engine is located on tank inner bottom plating, and the first pulley is located at the link position of the tank inner bottom plating and interior tank shell, institute
It states second pulley to be located on the dome longeron of the interior tank shell, the pulley assembly is located at corresponding with the tank interior conduit
On the dome longeron of casing both sides；The rope that the hoist engine stretches out by extending to described second successively after the first pulley
Pulley and the pulley assembly；By the hoist engine to the retractable operation of the rope, the cunning in the pulley assembly is controlled
Wheel carries out raising and lowering；
Step S3 lifts tank interior conduit；The rope is dropped near the tank inner bottom plating by the pulley assembly first,
And it is fixedly connected with the lifting lug of tank interior conduit upper end；Then start hoist engine and recycle rope, by the tank interior conduit
It is promoted to vertical state；Finally position is carried out to the tank interior conduit to fix.
2. LNG storage tank tank inner tube pipe fitting method according to claim 1, which is characterized in that in the step S1, institute
The lower end position for stating tank interior conduit is additionally provided with slipping tail lifting lug.
3. LNG storage tank tank inner tube pipe fitting method according to claim 2, which is characterized in that the hanging device also wraps
Crane is included, the crane is connect with the slipping tail lifting lug, and the promotion that the hoist engine is completed to the tank interior conduit is assisted to operate.
4. LNG storage tank tank inner tube pipe fitting method according to claim 1, which is characterized in that in the step S2, institute
It includes a movable pulley and two fixed pulleys to state pulley assembly, wherein the movable pulley is equipped with suspension hook；Two fixed pulleys
The dome longeron connection of casing both sides corresponding with the tank interior conduit, the movable pulley are located between two fixed pulleys respectively
Rope on, and with the hoist engine to the retractable operation of rope vertically raising and lowering.
5. LNG storage tank tank inner tube pipe fitting method according to claim 4, which is characterized in that in the step S3, institute
It states and is connected by steel wire rope between the lifting lug of tank interior conduit upper end, then connect with the suspension hook on the movable pulley.
6. the LNG storage tank tank inner tube pipe fitting method according to any one of claim 1-5, which is characterized in that described
The upper end of tank interior conduit is equipped at least two auxiliary lifting lugs, and the dome longeron that the tank interior conduit corresponds to casing both sides is equipped with extremely
Few two guide chains；When the hoist engine lifts the tank interior conduit to vertical state, and is promoted near described sleeve pipe, institute
It states guide chain to connect with the auxiliary lifting lug, the fine tuning of spatial position is carried out to the tank interior conduit.
7. LNG storage tank tank inner tube pipe fitting method according to claim 6, which is characterized in that the tank interior conduit it is upper
End is set there are four lifting lug is assisted, and is set on the dome longeron of described sleeve pipe both sides there are two guide chain, the dome of described sleeve pipe both sides is vertical
It is set between beam there are two floor stringer, and sets that there are one guide chains on each floor stringer.
8. LNG storage tank tank inner tube pipe fitting method according to claim 6, which is characterized in that the auxiliary lifting lug and institute
State the length that the distance between upper end port of tank interior conduit is stretched into more than the tank interior conduit in described sleeve pipe.
9. the LNG storage tank tank inner tube pipe fitting method according to any one of claim 1-5, which is characterized in that described
The position height of first pulley is identical as the rope height of the hoist engine.
10. the LNG storage tank tank inner tube pipe fitting method according to any one of claim 1-5, which is characterized in that described
Second pulley is located at same vertical direction with the first pulley.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248405.0A CN106927353B (en) | 2017-04-17 | 2017-04-17 | LNG storage tank tank inner tube pipe fitting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710248405.0A CN106927353B (en) | 2017-04-17 | 2017-04-17 | LNG storage tank tank inner tube pipe fitting method |
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| CN106927353A CN106927353A (en) | 2017-07-07 |
| CN106927353B true CN106927353B (en) | 2018-10-26 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107601274A (en) * | 2017-11-03 | 2018-01-19 | 中国能源建设集团广东火电工程有限公司 | A kind of slipping tail hanging apparatus and slipping tail hanging method |
| CN108715397A (en) * | 2018-07-27 | 2018-10-30 | 深圳市施罗德工业测控设备有限公司 | A kind of service hoisting cable suitable for pipe crawling device |
| CN109052264B (en) * | 2018-10-08 | 2024-04-09 | 广东大鹏液化天然气有限公司 | LNG storage tank wall maintenance auxiliary hoisting equipment |
| CN109607392A (en) * | 2018-10-31 | 2019-04-12 | 沪东中华造船(集团)有限公司 | A kind of LNG ship cargo tank gas vault hanging object device and its application method |
| CN112240431B (en) * | 2019-09-09 | 2021-06-04 | 南京扬子石油化工设计工程有限责任公司 | Method for installing pipeline in vertical storage tank |
| CN112830407A (en) * | 2021-01-22 | 2021-05-25 | 中建安装集团有限公司 | Hoisting method of petrochemical device module in engineering structure |
| CN115108464B (en) * | 2022-05-31 | 2023-08-04 | 中国化学工程第三建设有限公司 | Double-layer tank inner tank wall plate hoisting assembly device and assembly method |
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| JP4081835B2 (en) * | 1997-11-13 | 2008-04-30 | 株式会社Ｉｈｉ | Installation method of sheath type resistance thermometer |
| CN202864736U (en) * | 2012-10-16 | 2013-04-10 | 中石化第十建设有限公司 | Hoist for oil tank construction in cave depot |
| CN203638979U (en) * | 2013-12-13 | 2014-06-11 | 中石化南京工程有限公司 | Device for mounting tank floor in low-temperature storage tank |
| CN104477755B (en) * | 2014-12-24 | 2017-01-18 | 中国化学工程第三建设有限公司 | Method for rapidly hoisting suspended type vertical vessel |
| CN205367532U (en) * | 2016-01-28 | 2016-07-06 | 中石化第十建设有限公司 | Interim work platform of LNG storage tank inner tank demolishs device |
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