Abstract
Defects of mechanical origin are quite often found on the structural elements of the devices of the production facilities of the fuel and energy complex. One of the most common mechanical defects is scratches and hairlines on the outer surface of the structural elements. The current regulatory and technical documentation establishes standards for the rejection of defects of various types, which provide for the decommissioning of objects with unacceptable defects for repair or subsequent dismantling. However, in most cases, mechanical defects such as scratches are within acceptable sizes and do not have a decisive effect on the life, reliability and safe operation of vessels and apparatus. However, the presence of such defects can change the stress-strain state of the object to a more unfavorable side, and therefore accelerate the process of accumulating damage at points of concentration of increased stresses. Subsequently, places with a concentration of increased voltages under certain operating conditions can be sources of premature destruction of the element and failure of the object as a whole. Therefore, the actual work is the simulation of the stress-strain state of the flat manhole cover with a scratch, having a different arrangement. In this work, the stress-strain state of the flat manhole cover is examined depending on the location of the scratch on it at a different angle relative to the vertical axis of symmetry of the cover.
Highlights
Installation of vessels and apparatus of oil and gas industries is associated with formation of different level of defects in the material of various elements of the technical device
The actual work is the assessment of the stressed-deformed state (SDS) of the flat manhole cover depending on the length and location of the scratch on it at different angles relative to the vertical axis of symmetry of the cover under the influence of technological workloads [9-10]
The hatch has the following technical characteristics: size of a branch pipe of the union 472×18 mm; flange of connector is flat welded with thickness s = 18 mm; thickness of flat cover s = 10 mm; outer diameter of flat cover D = 510 mm; cover is equipped with 20 holes ∅ 18 mm for bolted connections
Summary
Installation of vessels and apparatus of oil and gas industries is associated with formation of different level of defects in the material of various elements of the technical device. The presence of scratches, especially on small structural elements, can have a significant impact on SDS, due to its geometric dimensions relative to the surface area of the element. In such cases, even a scratch of small sizes can significantly change the SDS of the element, thereby determining the reliability of the entire apparatus as a whole [5-8]. The actual work is the assessment of the SDS of the flat manhole cover depending on the length and location of the scratch on it at different angles relative to the vertical axis of symmetry of the cover under the influence of technological workloads [9-10]
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