For the normal course of the technological process, as well as for the convenience of maintenance and repair, the capacitive equipment of the oil and gas industry is equipped with technological nozzles in the amount and with the purpose regulated by the design documentation and regulatory technical documentation in the field of industrial safety. Tapping nozzles into the main structural elements of the tank weakens their cross-section and has a significant impact on the formation of values and zones of increased stresses. The distribution of the stress-strain state in the container body can be influenced by the geometric dimensions of the nozzles, their location, both relative to each other and relative to the structural elements, the design features of the container, operating loads and many others. Modeling of the stress-strain state, taking into account the above factors in specialized software complexes, allows us to consider various options and predict the stress distribution in capacitive equipment. Thus, studies are relevant to identify the patterns of change in the zones of concentration of increased stresses of the process tank both due to the influence of the tie-in of small-diameter nozzles into auxiliary structural elements, and the location of the tie-in of the nozzle into the element.