CN104456059B - The installation method of the interior tank shell of self-support type LNG storage tank - Google Patents
The installation method of the interior tank shell of self-support type LNG storage tank Download PDFInfo
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- CN104456059B CN104456059B CN201410562258.0A CN201410562258A CN104456059B CN 104456059 B CN104456059 B CN 104456059B CN 201410562258 A CN201410562258 A CN 201410562258A CN 104456059 B CN104456059 B CN 104456059B
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Abstract
The invention discloses the installation method of the interior tank shell of a kind of self-support type LNG storage tank.Comprise the steps: (1) if the wallboard of composite steel structure inner canister described in prefabricated dry tablet, and carry out carrying out flaw detection；The height of described wallboard is 30～40 meters, and arc length is 5～10 meters；In described prefabrication process, rustless steel or 9%Ni steel plate is used to isolate with carbon steel work card tool；(2) first, in concrete outer tank, lift, splice and weld the wallboard of described composite steel structure inner canister, form bottom ring wall plate；Then on described bottom ring wall plate, continue to lift, splice and weld the wallboard of described composite steel structure inner canister, until it reaches predetermined height, i.e. complete the installation of described interior tank shell.The interior tank shell mount scheme that the present invention relates to, is a kind of modern mount scheme being applicable to this Novel storage tank composite panel, is conducive to promoting this kind of Novel storage tank engineering and promotes.
Description
Technical field
The present invention relates to the installation method of the interior tank shell of a kind of LNG storage tank, be specifically related to a kind of self-support type LNG
The installation method of the interior tank shell of storage tank, belongs to petroleum gas field.
Background technology
Large LNG storage tank is an extremely important ingredient in whole LNG industrial chain.Self-support type LNG
Storage tank is a kind of novel large LNG storage tank structural shape, and in this Novel storage tank, tank shell is from top to bottom by encryption fin
Reaching to bear the purpose of differing heights hydraulic pressure with reinforcing ring structure, wall panel structure is relatively thin, and therefore the present invention will break through
The aspects such as inner canister wall thickness, welding difficulty limit, and propose new thinking for the research and development of ultra-large type storage tank.
Self-support type LNG storage tank inner canister composite construction improves mechanics of materials utilization ratio, decreases largely
Storage tank cost of investment；Interior jar structure can fulfil most of prefabricated installment work ahead of schedule in workshop or job site, decreases
Overhead welding installation, shortens the Storage Tank Construction cycle.
For the ease of welding and farthest considering that saving sheet material improves mechanics of materials utilization benefit, the type storage tank is multiple
Close structure inner canister by main wallboard, inner side fin (spacing 0.5m × 0.5m, deep 0.6m), outside fin (spacing
0.5m × 0.5m, deep 0.1m) composition.Composite construction inner canister is from top to bottom by adding back main wall plate and inside and outside fin thickness
Reach inner canister and bear the function of hydraulic pressure under different liquid level.
Relative to the conventional full-capacity tank inner canister wall panel structure of tradition, self-support type LNG storage tank is combined inner canister wall panel structure
By encrypting fin in a large number and reinforcing ring structure forms, therefore will be the most loaded down with trivial details according to traditional prefabricated installation method, on-the-spot group
Loading amount is too big, is unfavorable for construction and installation.Therefore, so that the type Novel storage tank Technique Popularizing, it is desirable to provide one
Plant the mount scheme being applicable to this Novel storage tank composite panel.
Summary of the invention
It is an object of the invention to provide the installation method of the interior tank shell of a kind of self-support type LNG storage tank, the present invention pacifies
Dress method is applicable to the Assembling of the composite steel structure inner canister of self-support type LNG storage tank.This self-support type LNG stores up
The inner canister of tank is from top to bottom by adding back main wall plate and inside and outside fin thickness reaches inner canister and bears the merit of hydraulic pressure under different liquid level
Energy；The fin direct LNG storage liquid with-162 DEG C in inner side contacts, between outside fin to prestressed concrete outer tank
Tank skin annular space in arrange insulation material.
The installation method of the interior tank shell of self-support type LNG storage tank provided by the present invention, comprises the steps:
The main body of described self-support type LNG storage tank includes concrete outer tank and is sheathed on answering in described concrete outer tank
Close steel construction inner canister；
The wallboard of described composite steel structure inner canister include main wallboard and several reinforcing rings of being located on said major wall plate and
Several strengthen fin, and described reinforcement fin is along the circumferential array of described composite steel structure inner canister；Described reinforcement fin bag
Include inner side fin and outside fin；
(1) if the wallboard of composite steel structure inner canister described in prefabricated dry tablet, and carrying out flaw detection is carried out；The height of described wallboard
Degree is 30～40 meters, and arc length is 5～10 meters；
In described prefabrication process, rustless steel or 9%Ni steel plate is used to isolate with carbon steel work card tool；
(2) first, in concrete outer tank, lift, splice and weld the wallboard of described composite steel structure inner canister, shape
Become bottom ring wall plate；Then on described bottom ring wall plate, continue to lift, splice and weld the wall of described composite steel structure inner canister
Plate, until it reaches predetermined height, i.e. completes the installation of described interior tank shell.
In above-mentioned installation method, in step (1), on the cut of wallboard and the limit of described composite steel structure inner canister
Brushing solderability paint at edge, such as cold galvanizing paint.
In above-mentioned installation method, in step (1), the rolling arc radius of the wallboard of described composite steel structure inner canister is institute
State 1.125 times of radius of composite steel structure inner canister.
To ensure that the wallboard amount of plastic deformation that rolling completes is less than 3%, when reducing wallboard longitudinal joint welding simultaneously
Group counter stress, reduce slab produce fire check probability.The model of 2m is used to check wallboard during described wallboard rolling arc
Radian, with ensure wallboard rolling arc precision.
In above-mentioned installation method, in step (2), in described hoisting process, use rubber by suspension hook and described wall
Plate is isolated, in case the magnetization of described wallboard；Further, place high tension cable to be avoided and the high-intensity magnetic field of described wallboard are stacked
Environment, in order to avoid it is magnetized.
In above-mentioned installation method, in step (2), before described bottom ring wall plate is installed, assembling inner round side welding gear
Plate；When described bottom ring wall plate is installed, assembling backing plate is set between described baffle plate and described bottom ring wall plate.
In above-mentioned installation method, in step (2), before described lifting step, adjust the longitudinal seam of described wallboard
It is evenly arranged on the basic circle of described composite steel structure inner canister.
In above-mentioned installation method, during longitudinal seam assembling, longitudinal seam should be used to assemble special fixture, to control between interface
Gap and angularity；The fixture of circumferential welded seam assembling is a channel-section steel pipe nipple having square opening, and its length is about 1000mm；
Two kinds of fixtures all coordinate through hole position block, cone pin to use.
In above-mentioned installation method, in step (2), described bottom ring wall plate hangs suspension type steel platform, as often
Described suspension type steel platform is placed, in order to workman completes the vertical weld seam welding between wallboard sheet every the distances of 2～3 meters.
The installation method of the interior tank shell of self-support type LNG storage tank of the present invention has the following characteristics that
1) in this composite construction, tank shell completes large stretch of flat moulded prefabricated in the prefabricated place in workshop or job site, and high-altitude is pacified
40% installed above and flaw detection is completed before dress.
2) interior tank shell is about 30～40m by height, and interior tank shell is divided into height 30～40m, arc length 5～10m
If dry tablet (3.14 × D/ (5-10m) sheet) completes prefabricated in workshop.
3) some wallboard sheets having completed prefabricated preliminary assembling complete assembly welding at the scene, are equivalent to tradition and entirely hold tank
In inner canister 10 multilamellar, jar structure one circle circle assembly welding, can save a large amount of in-site installation welding capacity.
4) the interior tank shell mount scheme that the present invention relates to, is a kind of modern times being applicable to this Novel storage tank composite panel
Mount scheme, is conducive to promoting this kind of Novel storage tank engineering and promotes.
Accompanying drawing explanation
Fig. 1 is the structural representation of self-support type LNG storage tank,
In figure, each labelling is as follows:
1 pile foundation, 2 prestressed concrete outer tanks, 3 compound in jar structures, 4 ceiling structures, 5 tank bottoms heat-insulation layers,
6 tank skin heat-insulation layers, 7 protection of hot angle system, 8 centralized pipelines, ladder integral structure, 9 feed systems, 10 pumps
Outer communication system, 11BOG processing system, 12 pop off valves (PSV), 13 antivoid valves (VSV).
Fig. 2 is the structural representation of the composite steel structure inner canister of self-support type LNG storage tank shown in Fig. 1.
If Fig. 3 is to complete prefabricated dry tablet wallboard schematic diagram in installation method of the present invention.
Fig. 4 is that in installation method of the present invention, bottom ring wall plate assembles backing plate schematic diagram.
Fig. 5 is that in installation method of the present invention, bottom ring wall plate supports schematic diagram.
Detailed description of the invention
Experimental technique used in following embodiment if no special instructions, is conventional method.
Material used in following embodiment, reagent etc., if no special instructions, the most commercially obtain.
The present embodiment, as a example by the installation of the inner canister of self-support type LNG storage tank shown in Fig. 1, illustrates the installation side of the present invention
Method.
First the structure of this self-support type LNG storage tank is described in detail: self-support type LNG storage tank shown in Fig. 1, including
Storage tank main body, in this storage tank main body includes concrete outer tank 2 and the composite steel structure that is sheathed in this concrete outer tank 2
Tank 3；Wherein, concrete outer tank 2 includes rigidly fixing the concrete bearing platform (not shown) of connection, concrete tank skin
(not shown) and concrete tank deck (not shown), and this concrete bearing platform is fixedly connected in pile foundation 1, should
Concrete bearing platform is used for transmitting and distributing concrete tank skin, concrete tank deck and the liquid load such as heavily to pile foundation 1.
As in figure 2 it is shown, be provided with multiple reinforcement fin 15 and reinforcing ring 16 on the thin-walled part 14 of composite steel structure inner canister 3,
Wherein strengthen fin 15 evenly distributed along the circumference of composite steel structure inner canister 3.It is externally provided with 4 along it at concrete tank skin
The buttress (not shown) that circumference is evenly arranged, and outside concrete tank skin, it is additionally provided with tendon (not shown),
It is anchored on buttress.Upper surface, the inner side of concrete tank skin and the inner side of concrete tank deck at concrete bearing platform
It is equipped with lining steel plate, can be used to ensure the air-tightness of storage tank main body, it is possible to bear various operating mode load.At coagulation
Being provided with ceiling board 4 between soil tank deck and the opening of composite steel structure inner canister 3, its material is aluminium alloy or rustless steel,
It is provided with heat-insulation layer thereon, so that the temperature of concrete tank deck will not be cool below its design temperature to prevent from freezing
Phenomenon occurs, and makes BOG evaporation capacity be controlled simultaneously；The material of described heat-insulation layer may be selected to be glass cotton or expansion
Perlite material, installs after need to considering cold insulation material life-time service because deadweight produces the shadow that compression causes cold insulation thickness to reduce
Ring.
Concrete outer tank tank bottoms on be provided with tank bottoms heat-insulation layer 5, Main Function is to keep LNG evaporation less than specific
Limit, the outside non-cryogenic parts of protection storage tank so that it is be under required ambient temperature, and prevent and as far as possible
Reduce water vapor condensation and the icing of storage tank outer surface；This tank bottoms heat-insulation layer 5 is typically certain bearing capacity
Foam glass brick, generally which floor foam glass brick is made up of, foam glass brick interlayer interlaced arrangement, it is to avoid exist
Run through gap to cause reducing cold insulation effect.The upper and lower layer of foam glass brick all spreads one layer of moistureproof asphalt felt cushion and makes
Levels foam glass brick occurs without crackle during being attained by optimal comprcssive strength and permanent use.At concrete tank
Tank skin heat-insulation layer 6 it is provided with between the tank skin of wall and composite steel structure inner canister 3.The inner surface of concrete tank skin is provided with
TCP hot angle protection system 7, protects the bottom body of wall of concrete outer tank 2 and cushion cap low to avoid when LNG leaks
Temperature is damaged, and it is made up of bis-layers of base plate of 9%Ni, riser and back foam glass brick insulation material.
The tank deck of concrete outer tank 2 is connected with LNG feeding pipe 9, when to store in ship LNG density is less than tank
During LNG density, it is possible to from bottom feed, use this kind of feed mode primarily to prevent tank inside from layering occurring,
Unloading LNG is made sufficiently to mix with tank inside LNG by controlling feed entrance point.The tank of concrete outer tank 2
Top communication system 10 outer with LNG is connected, outer defeated for LNG, and wherein this LNG communication system outward includes latent liquid type
Centrifugal pump (not shown), pump sump (not shown) and outer defeated pipeline (not shown), and latent liquid type centrifugal pump sets
In pump sump, outer defeated pipeline is connected with pump sump, is used for carrying LNG.
This LNG storage tank also includes BOG compressibility 11, in this storage tank the generation of BOG boil-off gas mainly by
Input in outside energy causes, as pump operating, the importing of external heat, the change of atmospheric pressure, the impact of environment and
Causing in tank the reasons such as the change of LNG volume to produce during LNG charging, BOG produces excess and will cause pressure of storage tank
Raise, now in order to maintain the normal pressure limit of storage tank, need suitable unlatching BOG compressor to get rid of excess
BOG boil-off gas.
This LNG storage tank also includes pop off valve 12 and the antivoid valve 13 being located on its tank deck, and decapacitation is storage tank
There is provided outside pressure protection, it is possible to certain protection is provided when storage tank produces superpressure and negative pressure condition.
Pump sump, feeding line and inside ladder in this storage tank are linked together by support, define such as institute in Fig. 1
The tank gut line that shows, ladder Integral connection structure 8, such weight load is delivered to concrete vault and is born responsibility by concrete
Being subject to, bottom is connected to vibration big when interior pot bottom avoids pump operation by built-in fitting.
The installation method of the composite steel structure inner canister 3 of above-mentioned self-support type LNG storage tank, comprises the steps:
1, workshop (or prefabricated place, job site) is prefabricated
The wallboard entirety of composite steel structure inner canister 3 (is i.e. included thin-walled part 14 and the multiple ribs being arranged on
Sheet 15 and reinforcing ring 16) if be separated into height be 30～40 meters, arc length be the dry tablet of 5～10 meters, as it is shown on figure 3,
And complete prefabricated in workshop, and carry out carrying out flaw detection.
Each wallboard is prefabricated complete after, cut and near brushing solderability paint cold galvanizing paint at edge 2cm.Wallboard
Rolling arc radius is determined by 1.125 times of inwall radius, it is ensured that the wallboard amount of plastic deformation that rolling completes is less than 3%,
Reduce group counter stress during wallboard longitudinal joint welding simultaneously, reduce slab and produce the probability of fire check.Wallboard rolling arc
The model that Shi Caiyong is 2 meters checks wallboard radian, it is ensured that the precision of the rolling arc of wallboard.
In order to reduce overhead welding amount, every a piece of wallboard external fin, internal-rib and reinforcing ring complete welding and visit in prefabricated place
Triage is tested.
The wallboard material of composite steel structure inner canister 3 is 9%Ni Steel material, for preventing wallboard prefabrication process to be magnetized,
Cutting, rolling arc and stacking process use rustless steel or 9%Ni steel plate isolate with carbon steel work card tool.Lifting wallboard
Time for use rubber suspension hook and 9% steel wallboard are isolated, in case wallboard magnetization.The place stacking wallboard to be avoided
High tension cable and strong magnetic field circumstance, in order to avoid 9% steel wallboard is magnetized.
The cutting of 9%Ni steel plate uses machine cuts or flame cutting, and according to flame cutting, machine cuts falls hot shadow
Ring district and cementation zone.Need to specify rational groove type and root face size when wallboard is prefabricated, reduce melting of weld seam
Composition and division in a proportion, it is ensured that girth joint does not produce fire check.
2, yard assembles, installs
If dry tablet has completed the wallboard sheet (height be 30～40m, arc length be 5～10m) of prefabricated preliminary assembling at the scene
Complete assembly welding, mainly use truck crane (more than 25T) coordinate assemble, before several wallboards mainly use automobile
Hang and coordinate lifting with the electric block on vault circular orbit.
Wherein, before bottom ring wall plate (wallboard of the bottom) assembles, burn-on baffle plate, baffle plate and assembling assembling inner round side
Assembling plate thickness is reserved between circle.When assembling bottom ring wall plate, between wallboard and plate washer, add assembling backing plate, as shown in Figure 4.
Find out each wallboard abutment joint (i.e. longitudinal seam) anchor point by design orientation at basic circle contour, make the longitudinal joint of wallboard
It is evenly distributed on basic circle, starts to lift wallboard from benchmark wallboard.
Longitudinal seam should be used to assemble special fixture, to control gap and the angularity of interface during longitudinal seam assembling；Hoop welds
The fixture of seam assembling is a channel-section steel pipe nipple having square opening, and its length is about 1000mm；Two kinds of fixtures all coordinate logical
Hole position block, cone pin use.
In order to ensure the assembling quality of wallboard, support of increasing expenditure inside tank skin is fixing, as shown in Figure 5.
In order to ensure wallboard installation quality, at the every 2～3 meters of high positions of bottom ring wall plate, hang suspension type steel platform, in order to
Workman completes the vertical weld seam welding between wallboard sheet.
Claims (1)
1. an installation method for the interior tank shell of self-support type LNG storage tank, comprises the steps:
The main body of described self-support type LNG storage tank includes concrete outer tank and the composite steel structure inner canister being sheathed in described concrete outer tank；
The wallboard of described composite steel structure inner canister includes main wallboard and several reinforcing rings being located on said major wall plate and several reinforcement fins, and described reinforcement fin is along the circumferential array of described composite steel structure inner canister；Described reinforcement fin includes inner side fin and outside fin；
(1) if the wallboard of composite steel structure inner canister described in prefabricated dry tablet, and carrying out flaw detection is carried out；The height of described wallboard is 30 ~ 40 meters, and arc length is 5 ~ 10 meters；
In described prefabrication process, rustless steel or 9%Ni steel plate is used to isolate with carbon steel work card tool；
The cut of wallboard and edge brushing solderability paint in described composite steel structure inner canister；
1.125 times of the radius that rolling arc radius is described composite steel structure inner canister of the wallboard of described composite steel structure inner canister；
(2) first, in concrete outer tank, lift, splice and weld the wallboard of described composite steel structure inner canister, form bottom ring wall plate；Then on described bottom ring wall plate, continue to lift, splice and weld the wallboard of described composite steel structure inner canister, until it reaches predetermined height, i.e. complete the installation of described interior tank shell；
In described hoisting process, rubber is used to be isolated with described wallboard by suspension hook；
Before described bottom ring wall plate is installed, assembling inner round side welding baffle plate；When described bottom ring wall plate is installed, assembling backing plate is set between described baffle plate and described bottom ring wall plate；
Before described lifting step, the longitudinal seam adjusting described wallboard is evenly arranged on the basic circle of described composite steel structure inner canister；
Described bottom ring wall plate hangs suspension type steel platform.
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Families Citing this family (7)
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| CN106907039A (en) * | 2015-12-22 | 2017-06-30 | 五冶集团上海有限公司 | The method for prefabricating of large-size stainless steel groove tank wallboard under hot environment |
| CN106754280A (en) * | 2016-11-29 | 2017-05-31 | 中国华电科工集团有限公司 | Marsh-gas fermentation tank |
| CN107335934B (en) * | 2017-07-04 | 2019-03-01 | 中国核工业第五建设有限公司 | The installation method of LNG tank inner stiffener ring |
| CN109737300B (en) * | 2019-01-10 | 2020-08-04 | 舟山市祥睿船舶科技开发有限责任公司 | Energy-saving L NG gas supply device |
| CN109973812B (en) * | 2019-04-09 | 2024-05-24 | 中集安瑞科工程科技有限公司 | Low-temperature storage tank |
| CN114623372A (en) * | 2020-11-06 | 2022-06-14 | 中太海事技术(上海)有限公司 | Land storage container for storing liquefied gas |
| CN114562673A (en) * | 2022-02-23 | 2022-05-31 | 中太(苏州)氢能源科技有限公司 | Corrugated board moisture-proof layer for film tank |
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| CN103015781B (en) * | 2012-12-05 | 2015-07-15 | 中国化学工程第十三建设有限公司 | Method for top lift installation of inner tank and outer tank of double-wall storage tank |
| CN203240268U (en) * | 2013-03-19 | 2013-10-16 | 中国海洋石油总公司 | Self-support type LNG (Liquefied Natural Gas) storage tank |
| CN103758387B (en) * | 2014-02-19 | 2016-02-10 | 中国海洋石油总公司 | The mounting method of liquefied natural gas (LNG) tank wallboard |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC Gas & Power Group Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CNOOC Gas & Power Group Patentee before: China National Offshore Oil Corporation |