The subject of the present invention, a pressurized tank, preferably a tank of the three bottom in particular form a toroidal tank is provided with a connected bottom, a connector pipe for installation, and a bracket fasten firmly tank and cover the type plate, and equipped cover, and the inner bottom portion, and an inner shell, is equipped with a partition, the outer upper base (1) forms an outer shell of the outer tank together with the lower bottom of the outer (2), on the other hand, the inner bottom (4) is connected to the inside of the outer shell (3), forms a central inner portion of the tank (S), a connector pipe (9, 9a, 9 b and 14) and the flow connector (15 , 15a) has two sections are each of length, preferably provided with a wall area a to the entire circumference of the connector of increased thickness, section B comprises a wall thickness thinned, whereas, If the wall thickness in the area B is the wall of a thickness of 0.5 to 1.7 of the thickness of the case of the tank element of 2.9mm 0.01, wall thickness exceeds 2.90 mm 0.3 characterized in that from 1.4.
.FIELD 1