CAUSES OF CRACKING OF FLANGE JOINTS OF PROCESSING PIPES FOR DELAYED COKING UNITS

Abstract

The article is devoted to the determination of the causes of damage in the form of cracking of flange connections of technological pipelines of a delayed coking unit, for which, when designing pipelines, it becomes necessary to use dissimilar flange connections. The article consistently explores the problem of damage in the form of cracking of dissimilar flange connections, the results of studies of the mechanical properties and metal structure of damaged flange connections are presented. It is concluded that the condition of the metal after prolonged operation is satisfactory and it could not be the cause of damage, the damage is not of the nature of damage due to corrosion effects of various nature. The calculated justification of the occurrence of damage is carried out on the basis of checking the strength conditions for equipment elements with the development of measures to prevent new damage. The results of calculations of the stress-strain state of pipeline elements are presented with justification for the occurrence of damage in the form of cracking of dissimilar flange connections with the existing material design of fasteners, as well as with the proposed change in the material.