Damage of metallic smoke pipes and carrier towers for life cycle and limit values of major defects and damages

Abstract

Abstract.  Purpose.  Smoke and ventilation pipes, bearing towers are an integral part of industrial enterprises and are complex and expensive high-rise engineering structures that are subject to significant wind, temperature, corrosion, seismic and other impacts. They are the final link in many important technological processes and their decommissioning, as a rule, leads to the shutdown  of the entire production and large financial losses. Determination of the residual life and durability of metal smoke and ventilationpipes, bearing  towers  after  long  periods  of  operation  is  an  actual  task  for  industrial  enterprises.  For  this  purpose,  the  analysis  and classification of defects and damages was carried out based on the results of a survey of the technical condition of more than 100 metal smoke and ventilation pipes, and 20 metal bearing towers, the need to determine the maximum permissible values  of defects and damages depending on the category of their danger, and From the category of technical condition of structures..  Methodology.  A modern  technique  was  developed  for  examining  the  technical  condition  of  industrial  metal smoke  and  ventilation  pipes  carryingtowers. The technique is developed on the basis of materials of technical condition tests of pipes and towers after a long period of operation, operating normative documents, evaluation of various effects on pipe elements.  Findings.  Statistical processing of defects and  damages was performed to collect data on the damageability of metal chimneys and load-bearing towers, performed on the basis of conclusions on the technical condition and industrial safety assessments. The classification of the main defects and damages of load-carrying  structures is  performed, the  maximum  permissible values  of  defects and  damages  are  determined  depending  on the category of their danger, and on the category of technical condition of the structures.  Originaliny.  The data on the damageability  of metal smoke and ventilation pipes, bearing towers in service for 30-50 years or more, and the values of the maximum permissible  values  of  defects  and  damages  have  been  determined.  Practical value.  Analysis  of  defects  and  damages  of  metal  chimneys  and bearing towers, determination of their maximum permissible values for each technical condition of the structures allows to estimate the residual life and durability of structures after a long service life.