The device of the bottom of the tank and the reinforced concrete tank

Vertical cylindrical tanks are placed on fairly simple sandy bases due to the insignificance of the pressure transmitted to them. Usually, the vegetation layer is first removed, the site is covered with bulk soil and compacted with rollers. A sand cushion is laid and compacted on top of the bulk soil, it is leveled, organizing a slope from the center to the periphery for runoff and subsequent removal of produced water and sludge. The slope is made equal to 1:50 for tanks with a capacity of 1020 thousand m3, 1:75 - for volumes of 3040 thousand m3 and 1:100 for volumes of more than 50 thousand m3. The diameter of the pillow should be 1.52.0 m larger than the diameter of the bottom of the tank. Between the bottom of the tank and the sand pad there is a waterproofing (hydrophobic) layer about 100 mm thick.

For tanks with a capacity of 10,000 m3 or more, a reinforced concrete ring is arranged around the perimeter of the base.

On rocky soils, the arrangement of foundations is sometimes reduced to leveling the site and adding a sand pillow.

Around the tank, fencing is provided in the form of soil shafts, reinforced concrete or metal walls. Their purpose is to keep the stored product flowing out of the tank in case of emergency.

The bottoms of the tanks experience negligible stresses from the pressure of the liquid, so their thickness is taken for technological reasons of convenience and reliability of welded joints and corrosion resistance.

The bottom of the tank consists of an even number of canvases (for the possibility of creating a slope), each of which usually does not exceed 12 m in width.

The blades are welded from sheets measuring 1500 x 6000 mm or 2000 x 8000 mm with a thickness of 5 mm with a capacity of up to 10000 m3 and a thickness of 6 mm with large volumes. Assembly and welding of canvases at factories is carried out on mechanized mills, where a flat large-sized billet is rolled into a multilayer overall roll, convenient for transportation to the installation site by rail. From this condition, the weight of the coil should not exceed 60 tons.