The construction of tanks for storing liquid gas is a horizontal cylindrical welded structure made of carbon steel, which includes structural elements as well as fittings and measuring equipment:
Each tank has a Passport, which contains a list of all construction elements and other materials along with their technical characteristics. In the passport, the manufacturer provides all data in detail, including construction dimensions, factory number and test results confirming compliance with the technical conditions required by the competent technical inspection body.
Underground tanks are an ideal solution in places where their location may be determined by other factors, e.g. interference with the surrounding environment, land development plan or small plot area or aesthetic considerations. The installation of such a tank requires earthworks and technical acceptance by the Office of Technical Inspection before burying the tank. The distances maintained in the case of an underground tank from the residential building and plot boundaries are slightly smaller than in the case of above-ground tanks. When planning the installation of an underground tank, the investor must pay attention to the groundwater level, because in the event of a high groundwater level, the tank can only be partially dug into the ground, and the part of the tank above the ground can be covered with a layer of soil.
The offered capacities of Defro underground tanks [L]: 2700, 3700, 4850, 6400 and 9200 are covered with an anti-corrosion coating that is highly resistant to water, flammable liquids and many chemicals. The tightness of the coating is tested for breakdown with a current of 14 kV. Underground tanks are standardly equipped with an inspection well with fittings and valves, the cover of which is located above the ground.