CN103692095B - Large-scale single disc-type External floating roof tank construction method of installation - Google Patents
Large-scale single disc-type External floating roof tank construction method of installation Download PDFInfo
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- CN103692095B CN103692095B CN201310665792.XA CN201310665792A CN103692095B CN 103692095 B CN103692095 B CN 103692095B CN 201310665792 A CN201310665792 A CN 201310665792A CN 103692095 B CN103692095 B CN 103692095B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- Mechanical Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
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Abstract
The invention discloses large-scale single disc-type External floating roof tank construction method of installation, in turn include the following steps: prefabricated procedure of processing, tank bottoms installation steps, tank skin installation steps, floating roof installation steps and Hose Test step.The invention has the beneficial effects as follows: lay vehicles while passing ramp, facilitate the turnover of haulage vehicle and crane, save the time of crane boatswain chair, shorten the base plate paving construction period；Crane directly on the basis of lifting operation lay base plate, save lease expenses；Use automatic welder(welding machine) to weld, save substantial amounts of labour cost；Wallboard is carried out with floating roof installation simultaneously, and interts adnexa betwixt and install, and shortens the construction duration of whole storage tank, in quality, safety and is guaranteed on the duration, have a higher using value, also has obvious Social benefit and economic benefit simultaneously.
Description
Technical field
The present invention relates to a kind of large-scale single disc-type External floating roof tank construction method of installation, it is adaptable to the manufacture of large-scale single disc-type External floating roof tank, installation.
Background technology
Along with the demand of the high speed development of China's economic, oil and product oil increases severely.China has become petroleum import big country, and oil has become the strategic materials that country is important, and it is directly connected to the economic development of China, social stability and national security, and large-scale vertical steel storage tank is the very important warehousing and transportation facilities of petroleum chemical industry.The construction of Chinese large-sized storage tank at present enters a new high-speed development period.
Therefore, the process that Large Oil Tank is built, oil tank quality safety and duration are had decisive significance.
Summary of the invention
The present invention provides a kind of large-scale single disc-type External floating roof tank construction method of installation.
The technical solution used in the present invention is:
Large-scale single disc-type External floating roof tank construction method of installation, in turn includes the following steps: prefabricated procedure of processing, tank bottoms installation steps, tank skin installation steps, floating roof installation steps and Hose Test step,
Described tank bottoms installation steps are: mark centrage and base plate outward flange circumference on tank base, lay base plate by typesetting figure；
Described tank skin installation steps are: at the inside and outside two circle baffle plates of bottom edge wooden partition Board position welding, assemble first lap wallboard and support with diagonal brace fixing, electro-gas (enclosed) welding is used to weld behind vertical seam fixture location, inner triangular frame suspension platform is installed, as job platform, assemble second section wallboard and weld vertical seam, using automatic submerged arc horizontal welding welding first segment wallboard horizontal position welding；Second section wallboard is installed inner triangular frame suspension platform, each joint wallboard is installed successively；
Described floating roof installation steps are: floating roof construction on the stand temporarily set up, floating roof whole employing manual electric arc weldings are welded.
Described prefabricated procedure of processing include base plate, wallboard, floating roof and adnexa prefabricated.
Described tank bottoms installation steps carry out the line of tank bottoms backing plate, margin plate and center plate, on the basis of the standard of base center, draw centrage, then determine that margin plate outward flange assembles radius Rt:Rt=(R+na/2 π)/cos θ,
In formula: R-side plate edge horizontal radius；A-every weld shrinkage；The quantity of n-arcuate edge listrium；θ-basis gradient angle.
The outer arc radius of described margin plate presses the 0.1%-0.15% of Enlargement Design radius, described backing plate length direction should be with margin plate edge nonparallelism less than 3mm, range deviation between centrage and the base plate butt weld length direction centrage of described backing plate length direction is less than 3mm, and the welding of described center plate uses C02Weldering filled by gas shielded arc welding and the broken silk of submerged arc.
Determining in described tank skin installation steps that wallboard is installed along the oblique internal diameter of tank bottoms unwrapping wire is: R group=(+R ' in R)/COS α,
In formula: in R-Oil Tank Design inside radius；The alpha-oil tank base gradient；The amount of contraction of R '-oil tank wallboard postwelding radial direction；R′=ma/2π；A-every weld shrinkage；M-oil tank wallboard vertical seam sum.
Respectively enclose the longitudinal seam of wallboard during described wallboard row's plate to stagger 1/4-1/3 to same direction from coil to coil.
In described floating roof installation steps, floating roof assembling procedure flow process is: interim pallet is set up, the welding of floating roof base plate assembly welding, floating roof ring flat-plate assembly welding, truss assembling, floating roof dividing plate assembly welding, floating roof top board assembly welding and column and column backing plate assembly welding.
Described Hose Test step detailed process is: when certainly starting bath to 600mm, stopping bath and tank bottom is carried out lysimetric test, ne-leakage is then gone up water and is just floated to floating roof, stops bath and cabin is carried out lysimetric test, after qualified, bath is to 1/2 liquid level, stop bath observation one day, wash by water to 3/4 liquid level, stop bath observation one day, wash by water to designing high level holding 48 hours, after observation meets the requirements waterproof, control when discharging water to discharge water speed, liquid level declines every day less than 3m.
Before described base plate is installed, building 4 meters wide vehicles while passing ramps in advance outside ringwall, the outer ramp of ringwall uses the earthwork to build, topping laying aggregate chips, and by exceeding ringwall laying with sleeper at ringwall.
On the basis of when described center plate is laid, truck crane reaches, the leg location of crane on the most mounted center plate, each supporting leg underlay two block length sleeper.
The invention has the beneficial effects as follows: lay vehicles while passing ramp, facilitate the turnover of haulage vehicle and crane, save the time of crane boatswain chair, shorten the base plate paving construction period；Crane directly on the basis of lifting operation lay base plate, save lease expenses；Use automatic welder(welding machine) to weld, save substantial amounts of labour cost；Wallboard is carried out with floating roof installation simultaneously, and interts adnexa betwixt and install, and shortens the construction duration of whole storage tank, in quality, safety and is guaranteed on the duration, have a higher using value, also has obvious Social benefit and economic benefit simultaneously.
Accompanying drawing explanation
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is ringwall of the present invention outer ramp schematic diagram.
Fig. 2 is the A-A sectional view of Fig. 1 of the present invention.
Fig. 3 be the tank bottoms bed board of the present invention structural representation.
Fig. 4 is the structural representation of margin plate group of the present invention.
Fig. 5 is spot welding mode schematic diagram of the present invention.
Fig. 6 is base plate center plate welding sequence schematic diagram of the present invention.
Fig. 7 is that the wallboard of the present invention is installed along tank bottoms unwrapping wire oblique internal diameter schematic diagram.
Fig. 8 is the first segment tank shell scheme of installation of the present invention.
Wherein: 1, ramp, 2, terrace, 3, tank base, 4, ringwall, 5, margin plate, 6, backing plate I, 7, adjustment plate, 8, gap, 9, center plate, 10, at spot welding, 11, wallboard, 12, base plate, 13, adjusting lever, 14, backing plate II, 15, baffle plate.
Detailed description of the invention
As shown in figures 1-8, the large-scale single disc-type External floating roof tank construction method of installation of the present invention, in turn include the following steps: prefabricated procedure of processing, tank bottoms installation steps, tank skin installation steps, floating roof installation steps and Hose Test step.
Prefabricated procedure of processing include base plate, wallboard, floating roof and adnexa prefabricated, at the construction field (site) near set up interim precast plant, the various construction machinery equipment of reasonable Arrangement in precast plant, power supply Party A provided, water source introduce in construction precast plant.
Described tank bottoms installation steps are: mark centrage and base plate outward flange circumference on tank base, base plate is laid by typesetting figure, before described base plate is installed, 4 meters wide vehicles while passing ramps at one are built in advance outside ringwall, the outer ramp of ringwall uses the earthwork to build, topping laying aggregate chips, and by exceeding ringwall laying with sleeper at ringwall, prevent from damaging ringwall (as illustrated in fig. 1 and 2).
Owing to tank diameter is big, the weight of individual tank bottoms center plate about 4 tons, on the basis of when tank bottoms center plate is laid, 25T truck crane need to reach, the leg location of crane, should select on the most mounted center plate, each supporting leg underlay two block length sleeper, to avoid damaging by pressure the asphaltic sands of surface of base.
Basis inspect for acceptance qualified after, carry out the line of tank bottoms backing plate, margin plate and center plate, on the basis of the standard of base center, draw centrage, determine that margin plate outward flange assembles radius Rt:Rt=(R+na/2 π)/cos θ, in formula: R-side plate edge horizontal radius again；A-every weld shrinkage；The quantity of n-arcuate edge listrium；θ-basis gradient angle (as shown in Figure 3).
On the basis of base center and four azimuth marks, cross centrage, tank bottoms backing plate (including bottom edge board and center plate) unwrapping wire is carried out by typesetting figure, the outer arc radius of margin plate is determined by the 0.1%-0.15% of Enlargement Design radius, carrying out cutting stock molding, the tank bottoms backing plate such as base plate unwrapping wire is carried out after having welded.
Centered by base center, with Rt as radius, according to material cutting plan, marking bottom edge board each bar assembly line, lay backing plate along scribing position, backing plate order is laid.Backing plate length direction should be with margin plate sides aligned parallel, and nonparallelism should be less than 3mm, and the range deviation between centrage and the tank bottom butt weld length direction centrage of backing plate length direction should be less than 3mm, and the laying of backing plate should leave enough survivors of a murder attempt.
When margin plate is laid, from the beginning of a certain orientation, carry out location to both sides and lay, to guarantee the accuracy of bed board position.Margin plate adjustment plate is finally installed, and cuts away unnecessary part by practical situation.During laying, it is necessary to assure group is to outer little feature (lateral gap is 6 8mm, and medial gap is 8-12mm) big in gap, and laying limit, limit combined clamp appts fixes (as shown in Figure 4).
Center plate is laid and should be laid by from middle toward the order of surrounding.The group opposite side spot welding of center plate limit, during spot welding, base plate to be close to backing plate, and clearance control is at below 1mm；Spot welding mode uses the method every 200mm weldering 50mm, during spot welding certain it should be noted that the only long limit of spot welding (end, long limit is about 300 500mm not spot welding), and only allow spot welding, minor face must not spot welding, point this plate present position of postwelding to be consistent (as shown in Figure 5) with typesetting figure.
When base plate has all welded with wallboard T angle welding, get final product group to whole shrinkage joints, after shrinkage joint has welded, first line semi auto cutting machine is by Partial Resection unnecessary for center plate, it is right to organize together with being stitched by Carapax Et Plastrum Testudinis between weld seam reserved for special-shaped center plate end and center plate with margin plate again, and the assembling of base plate is fully completed.
The welding of margin plate uses SMAW, and all welders must be uniformly distributed, and welds according to same direction simultaneously, it is ensured that margin plate welding is shunk uniformly；Center plate welding uses C02Weldering filled by the broken silk of gas shielded arc welding+submerged arc；Carapax Et Plastrum Testudinis seam welding uses SMAW back cover+broken silk of submerged arc to fill weldering, before installing first lap wallboard, first carries out the welding of 300mm weld seam outside margin plate；Tank bottoms center plate welds, and first welds short seam, welds slit afterwards, and the long weld seam of center plate welds to both sides by tank central weld successively, thus pre-anti-welding deformation, it is ensured that welding quality (as shown in Figure 6).
Tank skin installation steps are: at the inside and outside two circle baffle plates of bottom edge wooden partition Board position welding, assemble first lap wallboard and support with diagonal brace fixing, electro-gas (enclosed) welding is used to weld behind vertical seam fixture location, inner triangular frame suspension platform is installed, as job platform, assemble second section wallboard and weld vertical seam, using automatic submerged arc horizontal welding welding first segment wallboard horizontal position welding；Second section wallboard is installed inner triangular frame suspension platform, each joint wallboard is installed successively.
Determining that wallboard is installed along the oblique internal diameter of tank bottoms unwrapping wire is: R group=(+R ' in R)/COS α, in formula: in R-and Oil Tank Design inside radius；The alpha-oil tank base gradient；The amount of contraction of R '-oil tank wallboard postwelding radial direction；R′=ma/2π；A-every weld shrinkage；Vertical seam sum (as shown in Figure 7) of m-oil tank wallboard.
Tank bottom has assembled, outside bottom edge board butt weld, 300mm has all welded, and it is qualified to detect a flaw, after margin plate marks installation radius, according to tank skin material cutting plan, circumferentially mark the installation site of first segment every plate of wallboard, and check whether the position of opening on first lap wallboard meets design drawing and code requirement.
Baffle plate is assembled along the electric welding of the garden of assembling, according to typesetting figure and anti-line position, use 25t truck crane and use hanging beam to carry out the lifting of wallboard, first start to install from turnover oil pipe oralia, along arranging (also can install) along both direction counterclockwise or the most one by one simultaneously, first plate adds two adjusting levers in inner side, every plate adds an adjusting lever later, connect with vertical seam fixture between adjacent two plates, to carry out vertical gap, levelness suitable for reading, the coarse adjustment of radian and misalignment etc., after wallboard is completed, by first adjusting ovality, adjust levelness suitable for reading again, the order finally adjusting perpendicularity adjusts three degree.Ovality: be adjusted with assembling baffle plate and square cotter seam fixture, vertical.Levelness: adjust with square cotter or jack, perpendicularity: be adjusted with adjusting lever and vertical seam fixture, after first segment wallboard vertical welding, again should carry out three degree checking and adjust, using the benchmark assembled as second layer wallboard, check ovality arc plate, check levelness ribbon suitable for reading and level gauge, check perpendicularity plumb bob.
Second section is carried out after being arranged on, to Section of eight wallboard, the lower floor's wallboard passed examination welded.Often joint wallboard erection sequence is: sets up spider suspension platform inside a circle before assembling the second band plate on the first band plate and, as job platform, uses for the second band assembly welding；After treating that the second band plate has welded, spider suspension platform is placed on the second band plate；The circulation of later each layer is carried out.At tank manhole, setting up inclined ladder, for the upper and lower job platform of operating personnel, when floating roof construction, inclined ladder following for top is removed, be arranged on floating roof.The group of each circle wallboard to for improving work efficiency, reduces work high above the ground, convenient installation, and other respectively encloses the group of wallboard to front, should shift to an earlier date and the fixture on wallboard is welded on tank skin inwall.
Vertical seam group is carried out from inner side, and group is 5mm to gap, and group is to E template of burn-oning after getting well；All vertical seams all use the welding method that manual electric arc welding and electro-gas (enclosed) welding combine；First segment wallboard longitudinal joint bottom about 300mm uses manual welding, and remaining respectively saves wallboard longitudinal joint bottom about 50mm and uses manual welding.First two pieces of arc-extinguishing plates of spot welding on wallboard top before weldering.First and second circle vertical welding molding at twice, first welds outside, welds inner side afterwards, and two welding machines are symmetrical, weld the most from bottom to top.
In described floating roof installation steps, floating roof assembling procedure flow process is: interim pallet is set up, the welding of floating roof base plate assembly welding, floating roof ring flat-plate assembly welding, truss assembling, floating roof dividing plate assembly welding, floating roof top board assembly welding and column and column backing plate assembly welding, floating roof construction on the stand temporarily set up, floating roof whole employing manual electric arc weldings are welded；
Floating roof being assembled on floating roof falsework is carried out.In the tank bottoms position marking falsework column according to support figure, the position of column avoids the position of pontoon pillar as far as possible；The assembling of falsework is carried out from center to surrounding, and mid portion uses diamond-mesh arrangement, and adjacent stent is connected by crossbeam and forms triangle.Marginal portion assembles one ring support along the inside 300mm of tank skin, and ring support angle steel is connected with mid portion support；Adjust falsework so that it is cabin supporting surface is in approximately the same plane；The aspect ratio cabin base plate of falsework formally height increases 150mm.
Requiring to install edge buoyancy module according to material cutting plan and design, lay floating roof plate, lay from center to surrounding, laying limit, limit carries out spot welding；Welding sequence at the bottom of floating roof welding sequence reference can；The weld seam of floating roof plate is soldered, and vacuum leakage test and kerosene leak test are complete, installs central authorities' buoyancy module plate, and top board welds the weld seam of overhead welding part in time when laying, and reduces the weld job in cabin after closing.The laying order of central authorities' buoyancy module top board is with floating roof plate.
Top adnexa includes cabin manhole, pillar, catch pit, vent valve, the gauging mouth of pipe, breather valve, floating ladder track, scrape the compositions such as cured scene, sealing system, floating roof manhole and central drain, at tank the most prefabricated outer adnexa, after floating roof being soldered, the position first demarcated according to drawing measures, unwrapping wire, mark the installation site line of each adnexa, sail cabin manhole, then compare scribing position on floating roof top board to regional.Accurately determine pillar sleeve, catch pit, the position of floating roof manhole, vent valve, the gauging mouth of pipe, breather valve, floating roof track etc., carry out above-mentioned every perforate after determining, install and weld.Carry out passed examination by design requirement after welding, then carry out scraping the installation of the adnexaes such as lap sealant, and the installation of floating roof central drain and welding.
When floating roof column is installed, first adjust its height.200mm adjustment amount is reserved by its design height, carried out by many people during installation simultaneously, available interim pallet adjustable nut adjusts, mounting column, is fixed on sleeve pipe with pin, after every root post is all installed, the most dismountable floating roof pallet, and derived from manhole, after pallet is removed, installation and the welding of each adnexa in floating roof bottom surface can be carried out.
The adjustment again of support leg is when filling water test, then carries out during discharging water.Its method of adjustment is to discharge water to stop when exceeding 300mm to the floating roof position, the end of water table ratio discharging water, and adjust each column is actually needed length.
Top angle, winding staircase and platform, floating ladder, dipping tube and platform, these components are prefabricated on platform.Winding staircase divides two sections of installations, winding staircase platform integral installation, dipping tube platform integral installation, floating ladder is prefabricated into two sections, wherein one section reserves 300mm adjustment amount, until dipping tube platform and floating roof on track installation complete after, survey its size, then rotative ladder group to getting up, spring quantum is noted during prefabricated floating ladder, group, to rear, floats ladder integral hoisting, notes preventing bending and deformation during lifting.
Winding staircase and the tripod of platform, backing plate, install along with the installation of tank skin by figure paper size, and weld perfect.It is placed on tripod centering location with crane first paragraph of slinging when winding staircase is installed, is welded and fixed.After hypomere winding staircase is installed, the halfpace of winding staircase is installed, and by complete for the erecting and welding such as the handrail of winding staircase halfpace, railing.Tank skin top angle erecting and welding is complete.
Dipping tube installation requirement position is accurate, coordinates with wind resistance collar aperture appropriately, connects reliable.Dipping tube upper brace installs, and lower support positions.After guiding in-site installation, carrying out the installation of dipping tube, dipping tube is prefabricated into entirety, notices that its glacing flatness must reach requirement, notices that its perpendicularity reaches standard-required during installation.
Described Hose Test step detailed process is: when certainly starting bath to 600mm, stopping bath and tank bottom is carried out lysimetric test, ne-leakage is then gone up water and is just floated to floating roof, stops bath and cabin is carried out lysimetric test, after qualified, bath is to 1/2 liquid level, stop bath observation one day, wash by water to 3/4 liquid level, stop bath observation one day, wash by water to designing high level holding 48 hours, after observation meets the requirements waterproof, control when discharging water to discharge water speed, liquid level declines every day less than 3m.
Lay vehicles while passing ramp, facilitate the turnover of haulage vehicle and crane, save the time of crane boatswain chair, shorten the base plate paving construction period；Crane directly on the basis of lifting operation lay base plate, save lease expenses；Use automatic welder(welding machine) to weld, save substantial amounts of labour cost；Wallboard is carried out with floating roof installation simultaneously, and interts adnexa betwixt and install, and shortens the construction duration of whole storage tank, in quality, safety and is guaranteed on the duration, have a higher using value, also has obvious Social benefit and economic benefit simultaneously.
Claims (10)
- The most large-scale single disc-type External floating roof tank construction method of installation, it is characterised in that: in turn include the following steps: prefabricated procedure of processing, tank bottoms installation steps, tank skin installation steps, floating roof installation steps and Hose Test step,Described tank bottoms installation steps are: mark centrage and base plate outward flange circumference on tank base, lay base plate by typesetting figure；Described tank skin installation steps are: at the inside and outside two circle baffle plates of bottom edge wooden partition Board position welding, assemble first lap wallboard and support with diagonal brace fixing, electro-gas (enclosed) welding is used to weld behind vertical seam fixture location, inner triangular frame suspension platform is installed, as job platform, assemble second section wallboard and weld vertical seam, using automatic submerged arc horizontal welding welding first segment wallboard horizontal position welding；Second section wallboard is installed inner triangular frame suspension platform, each joint wallboard is installed successively；Described floating roof installation steps are: floating roof construction on the stand temporarily set up, floating roof whole employing manual electric arc weldings are welded.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 1, it is characterised in that: described prefabricated procedure of processing include base plate, wallboard, floating roof and adnexa prefabricated.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 1, it is characterized in that: described tank bottoms installation steps carry out the line of tank bottoms backing plate, margin plate and center plate, on the basis of the standard of base center, draw centrage, determine that margin plate outward flange assembles radius Rt:Rt=(R+na/2 π)/cos θ againIn formula: R-margin plate outward flange horizontal radius；A-every weld shrinkage；The quantity of n-arcuate edge listrium；θ-basis gradient angle.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 3, it is characterized in that: the outer arc radius of described margin plate is by the 0.1%-0.15% of Enlargement Design radius, described backing plate length direction should be with margin plate edge nonparallelism less than 3mm, range deviation between centrage and the base plate butt weld length direction centrage of described backing plate length direction is less than 3mm, and the welding of described center plate uses C02Weldering filled by gas shielded arc welding and the broken silk of submerged arc.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 1, it is characterised in that: determining in described tank skin installation steps that wallboard is installed along the oblique internal diameter of tank bottoms unwrapping wire is: R group=(+R ' in R)/COS α,In formula: in R-Oil Tank Design inside radius；The alpha-oil tank base gradient；The amount of contraction of R '-oil tank wallboard postwelding radial direction；R′=ma/2π；A-every weld shrinkage；M-oil tank wallboard vertical seam sum.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 5, it is characterised in that: respectively enclose the longitudinal seam of wallboard during described wallboard row's plate and stagger 1/4-1/3 to same direction from coil to coil.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 1, it is characterised in that: in described floating roof installation steps, floating roof assembling procedure flow process is: interim pallet is set up, the welding of floating roof base plate assembly welding, floating roof ring flat-plate assembly welding, truss assembling, floating roof dividing plate assembly welding, floating roof top board assembly welding and column and column backing plate assembly welding.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 1, it is characterized in that: described Hose Test step detailed process is: when certainly starting bath to 600mm, stop bath and tank bottom is carried out lysimetric test, ne-leakage is then gone up water and is just floated to floating roof, stop bath and cabin is carried out lysimetric test, after qualified, bath is to 1/2 liquid level, stop bath observation one day, bath is to 3/4 liquid level, stop bath observation one day, wash by water to designing high level holding 48 hours, discharge water after observation meets the requirements, control to discharge water when discharging water speed, liquid level declines every day less than 3m.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 8, it is characterized in that: before described base plate is installed, 4 meters wide vehicles while passing ramps at one are built in advance outside ringwall, the outer ramp of ringwall uses the earthwork to build, topping laying aggregate chips, and by exceeding ringwall laying with sleeper at ringwall.
- Large-scale single disc-type External floating roof tank construction method of installation the most according to claim 3, it is characterised in that: on the basis of when described center plate is laid, truck crane reaches, the leg location of crane on the most mounted center plate, each supporting leg underlay two block length sleeper.
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| CN108930441A (en) * | 2017-05-26 | 2018-12-04 | 五冶集团上海有限公司 | Large-size stainless steel groove tank siding installation method under hot environment |
| CN108931386A (en) * | 2017-05-27 | 2018-12-04 | 五冶集团上海有限公司 | Large-size stainless steel groove tank filling water test method under hot environment |
| CN109214018B (en) * | 2017-07-03 | 2022-02-08 | 中国石油化工股份有限公司 | Storage tank design method and device |
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| CN101858161A (en) * | 2010-07-13 | 2010-10-13 | 中国化学工程第四建设公司 | Construction method of low-temperature double-wall storage tanks |
| CN102626850A (en) * | 2012-04-27 | 2012-08-08 | 中国化学工程第四建设有限公司 | Installation process for metal oil tank in cave storage |
| CN103015781A (en) * | 2012-12-05 | 2013-04-03 | 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 |
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