Design and installation of large shell oil tank
Large latticed shell tank shell tank is a tank top surface mesh structure and frame structure of physical structure, thin shell structure stress reasonable, at present is mainly used as the roof of the triangular lattice shell and socket type shell or meridian lattice shell technology to design of large storage tank at the top of the structure, the spanning capacity, force uniform, good rigidity, less material consumption, convenient assembly, safe and reliable is a kind of important safety very high large span space structure, diameter 21-60 meters or the volume is more than 2 million cubic meters of large storage tank should take shell techniques, for more than 30 years in the global and China's Petroleum and chemical industry are generally implemented and used.
One, the advantages of large shell storage tank factory manufacturing and field construction:
There are many advantages in the form of the storage tank shell, which is a single - sided ball layer, the factory production and the field installation:
1, all parts of the factory, standardization of production, good quality, high precision, high efficiency;
2, the site construction is convenient, fast, the basic no welding, save the construction cycle, no need for large lifting equipment;
3, suitable for large storage tank with a diameter of 21-60 meters;
4, the skin plate adopts herringbone paving, than rind save a lot of material costs in laying;
5, dome roof installation can adapt to the installation on the tank for storage tank inversion erecting method;
6, large storage tank of the shell can be installed and the tank floor and wall panels installed, to avoid the safety of high altitude operation.
Two, large steel shell of tank shell:
Storage tank shell is generally suitable for the corrosion of carbon steel in the medium of the occasion, otherwise, it is necessary to carry out anti-corrosion treatment of steel reticulated shell. The domestic and foreign steel shell is mainly used for various storage tank top cover, it has the following characteristics:
1, composed of shell and roof of storage tank roof, shell as the top cover by members, top cover (skin) only as a seal component, so the top cover can choose thin plate, greatly reducing the weight of the roof, the roof plate laying in a triangular arrangement of grid member, and each triangle in the middle part of the bar added rod supporting point, shell and no welding. Therefore, the roof construction is convenient, the appearance curve is smooth and beautiful.
2, light weight structure, with the diameter of 30 meters above the tank shell cover rate than the conventional plate rib structure, material was 20% ~ 50%, with the tank size is bigger, and the materials and has obvious economic benefit.
Connecting channel 3, and on the wall of the tank shell steel buckle, increase the wind resistance at the top of the tank wall plate.
4, steel latticed shell roof tank accessories and placement within the shell of the triangle mesh, if with the shell member collide, then the corresponding offset.
5, steel reticulated shell structure can ensure that the tank under accident state, because of the top cover and the shell without welding, roof structure will not be damaged, only the damaged part of the roof as a local repair, so that the repair is convenient.
Three. The characteristics of the aluminum shell in the large reticulated shell:
Aluminum shell of tank, the choice of aluminum alloy material has the characteristics of light weight and corrosion resistance, Europe and the United States is the aluminum alloy shell for a large number of highly corrosive environment of tank cover to the steel. It has the following personality:
1, using aluminum alloy shell and aluminum alloy cover, the structure weight is greatly reduced, so that the tank, tank and its foundation bearing corresponding reduction. Such as diameter 30-60m aluminum cover is the weight of the steel shell 1/4~1/9.
2, aluminum alloy material has good corrosion resistance, so the aluminum shell cover is not necessary for the top cover part of the anti-corrosion treatment, saving the cost of anti-corrosion and project indirect cost. During the entire service period, it does not need to be maintained, saving a lot of inspection, maintenance costs.
3, the radiant heat of the aluminum reflector is up to 95%, so the aluminum alloy shell cover is used for the roof tank, can reduce the volatile medium volatile loss.
4, aluminum alloy material strength at low temperatures but compared with that of room temperature increase, is the ideal material in low temperature condition, so the use of aluminum dome and roof, in the introspection to prevent additional temperature brittleness of material thermal insulation material and the cost.
5, with aluminum alloy shell and roof, set on top of the tank attachment, such as: platforms, escalators, light hole, amount of oil hole, column by device can also be a corresponding use aluminum alloy material, shell and synchronous design, production.
6, aluminum alloy roof through a shell of stainless steel bearing transition and tank wall upside down channel steel is connected, via a special sealing structure to ensure the aluminum and steel sealing connection, but also increase the stability of the tank wall plate.

7. Large aluminum shell safety is relatively high: high safety coefficient, reasonable structure, a triangle mesh, aluminum skin can be installed capacity of 15 people; aluminum shell cover skin can gravity bearing, also can release the tank overpressure and the first local damage, effectively protect the top of the tank shell and oil tank structure is not affected; good quality, the use of long life, at home and abroad for more than 30 years of large storage tank aluminum shell still in safe use.
Four, we design and build a large shell of the shell of the general contractor:
Wuhan zoher petrochemical technology research and design in GB GB50128 American Standard API650 storage technology building, with large latticed shell tank design capabilities, ASME certification, have the capability of welding pressure vessel design, manufacturing license, GC2 design and installation of pressure pipeline license, general contracting qualification, petroleum chemical equipment and pipeline safety production license, international trade import export warrants and other special qualifications, the construction of large storage tank design and performance throughout the world, including the East Timor power plant, power plant, Hella Comodo Southern Power Plant of Ecuador oil tank area, and desalting water tank, Venezuela heavy oil area, Turkey power plant one or two of the oil tank and demineralized water tank overall design and construction, Africa, Niger Yamei tank power plant the design and construction and so on; especially in Venezuela in 2015 30000 cubic meters of heavy oil tank design and construction project contract, we use the triangular shell technology and field top safety design build general contracting, after the foreign construction site for 3 months, once put into use, the safety of oil feeding power, has been highly praised by the owners, for the electric power industry Venezuela has made heavy To contribute.
(Fig.) 30000 cubic meters of heavy oil storage tanks for the central power plant of Venezuela, which I designed and built in 2015, is the site of the work: