Basic acceptance and assembly of oil storage tank

Based on acceptance

Before the installation of the storage tank, the tank equipment foundation shall be accepted, and the intermediate transfer procedures for the equipment foundation acceptance shall be handled; Secondly, the size of the foundation surface was reviewed, and the allowable deviation of the elevation error of the tank foundation was 20mm; For the foundation surface supported by the groove wall, the height difference of any two points in every 10m arc length shall be less than or equal to 6mm, and the height difference of any two points in the whole circumference shall not be more than 12mm. The bottom surface of the oil sand shall be smooth and compact, without clear protrusions, depressions and penetrating cracks. PPH storage tank 。

Water tank assembly

First, on the basis of the equipment, select the appropriate position, lay the foundation of overlapping the middle reference plate of the plate edge and the middle zone reference plate and the middle of the cross, determine the installation position of the water tank, and then gradually lay from the middle to both sides. Secondly, in the process of laying, ensure the amount of overlap, adjust it at any time, and weld and fix it after confirmation. At the same time, the spot welding distance of long welds shall be as large as possible to facilitate the spading of short welds.

The top of the water tank shall be installed in corresponding order. After the top ring plate and side beam are installed, the steel shell mesh shall be installed, and then the top skin of the water tank shall be assembled. It should be noted that the perimeter of the wall assembly line should be drawn on the tank bottom plate, and appropriate baffles should be set at 500mm intervals inside the tank. When the top ring plate is assembled and welded, its diameter, shape and perpendicularity shall be controlled in strict accordance with the design requirements to ensure the installation accuracy of the side beam. At the same time, after the longitudinal seam is welded, the roundness, levelness and perpendicularity of the upper mouth shall be checked to control the error. The roundness tolerance is ± 20mm, the levelness tolerance is ± 5mm, and the perpendicularity tolerance is 3mm. To ensure the tightness and accuracy of skin installation, the number of skin shall be marked on the side beam equally.

Large oil storage tanks have large volume, high height and great construction difficulty. If the installation method is adopted, the construction risk is high and the construction quality is difficult to guarantee. The construction process of the overturning method is mainly carried out on the ground, not subject to the height of the trough, which can not only ensure the construction and construction speed, but also do not require the use of large cranes and scaffolding to reduce the workload, and provide a broader space for construction. The construction sequence of the overturning method is: tank bottom → the first circle of tank wall → side beam → grid structure → roof → hoisting → lower wall. The wall must be equipped with expansion ring, which shall be subject to regular requirements according to laws and regulations. In the tank wall part, it shall be tightened with a weight of 1000 kg, and the hydraulic lift shall be equipped with expansion ring, and then the tank shall be filled with oil. Repeat this step until the installation is complete.

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