The operation of devices with a shirt is carried out at high pressures and temperatures in corrosive environments. This is a prerequisite for the development of such a damage mechanism as a decrease in wall thickness and loss of strength. For a quantitative assessment of the degree of corrosion wear and prediction of the further period of safe operation of the apparatus, standard methods and techniques are used, which are indicated in the current regulatory and technical documentation for diagnosing and evaluating the resource. For apparatuses with a shirt, access to a complete 100% inspection of the inner surface of both the main apparatus and the shirt is difficult due to the design features and the absence of a hatch of sufficient diameter. In this regard, a large error in the qualitative assessment of the technical condition and resource forecasting is possible. Currently relevant is the work on modeling apparatuses and assessing the stress-deformed state, taking into account their design and operational features, taking into account changes in the parameters of the technical condition, such as corrosion wear, and identifying the most loaded zones and areas with a view to their furthermore detailed diagnosis. In this paper, we study the interconnection between the effects of operational loads and corrosion wear, both of the apparatus itself and the shirt on the stress-deformed state of the apparatus as a whole.

Vessels and apparatuses operating under pressure at hazardous production facilities are operated under conditions of many factors that limit the safe service life. These factors include elevated pressures and temperatures, damage during operation, exposure to both static and cyclic loads, etc. The most common and determining damage to metal equipment is corrosion wear. Corrosion wear negatively affects reliability during operation, gradually reducing the strength of the technical device by reducing wall thicknesses and thereby bringing the object closer to its ultimate state. As a rule, visual inspection and thickness measurements make it possible to identify corrosion zones, analyze these zones and give recommendations for further operation or replacement of defective areas. However, some designs of vessels and apparatuses do not give the opportunity to carry out work on the assessment of the corrosion state in full, and in this regard, there is a possibility that adverse sections will be skipped. Especially such problems arise when diagnosing devices with multiple workspaces. Currently, the work on modeling equipment of this type with the use of specialized software systems for assessing the stress-deformed state taking into account all the factors present and identifying the most unfavorable zones with maximum effective stresses is relevant. In this paper, we study the interconnection between the effect on the apparatus with a shirt of operating parameters when modeling various scenarios of corrosion wear.

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Capacitive equipment of oil refineries is widely used in the operation of technological units and plays one of the dominant roles, both in terms of metal consumption and the degree of use. Depending on the purpose, the required capacity of the stored product and constructive features, containers reach rather large overall dimensions, which creates certain difficulties in diagnosing the entire surface of the vessel. In the process of manufacturing and repairing the bodies of technological tanks, it is possible to form such a geometric defect as “displacement of the edges of the abutting elements” when welding cylindrical shells to each other by circular welded seams. In the presence of geometric defects of this type, additional stress concentrators are created in the areas of the presence of these defects, which may be a prerequisite for the transition of an object to the limiting state in a fairly short period of time from the action of increased pressures and temperatures. Also, the presence of displacement of the edges on the body of the capacitive apparatuses can have a negative effect on the stress-deformed state of the considered capacity as a whole and to the formation of dislocation zones of increased stresses. Therefore, the actual work is the study of the stress-deformed state of the container with the presence of a zone of displacement of the edges in the circumferential welded seam of the body from the viewpoint of the formation of zones of increased stress. This work evaluates the stress-deformed state of the capacitive apparatus under the influence of operating parameters with a different location of the edge displacement zone in the circumferential weld on the apparatus body.

Separators are operated at elevated working pressures and temperatures, as well as the simultaneous presence of liquid and gaseous working media that have an aggressive effect on the metal. With the combined action of workloads and exposure to a corrosive environment during operation, the development of defects such as general corrosion, stress corrosion cracking, ulcerative corrosion, etc. In order to determine the technical condition of the apparatus, the main mechanism of damage of which is corrosion, it is necessary to measure wall thicknesses, the minimum value of which is regulated by the current regulatory and technical documents on industrial safety. The presence of such uncontrolled areas does not fully provide a reliable picture of the assessment of the technical condition, and the actual stress-strain state of the entire shell is not taken into account, depending on the design of the apparatus, the presence and location of process fittings, the degree of corrosion wear, etc. In this paper, we study the relationship between the impact of operational loads, the influence of the location of technological fittings on the stress-strain state of the cylindrical shell of the separator during its corrosion wear.