ETD is pleased to announce the triumphant completion concerning matters on Condition and life assessment of radiant tubes for a Petrochemical Plant in Asia.
The client requested a quotation on vertically hanged Radiant tubes which have been in operation since Jan-2014. Significant permanent bowing due to unbalanced counterweight effect during first 2 years in operation was observed. Sudden temperature drop was noticed during instrument failure in June-2017. During the 4 years operation period, no tube rupture, no tube bulging, no dimensional difference or growth on diameter was observed.
Due to high temperature operation of radiant tubes, losing strength / metallurgical property due to carburization, oxidization, micro and macro cracks, grain issues, precipitation, creep, etc. was expected.
The scope of the work to be carried out included:
Visual and dimensional examination of the tube samples including internal and external appearance;
Assessment of condition of internal and external surfaces including identification of inclusions/ contaminations, welding defects etc (if any existed);
Chemical analysis of base material to determine the chemical composition of the tube material to establish actual material constituents;
Metallographic examination of the tube samples using optical and scanning electron microscopy to assess the condition of internal and external surfaces, to identify phase changes in microstructure / material degradation/ precipitations and also to identify the damage mechanism(s);
Further examination using Scanning Electron Microscope (SEM) to confirm any damage or material degradation;
Hardness testing and evaluation to determine the equivalent tensile strength values (using published hardness/ UTS correlation tables) to assess the mechanical strength or softening of the materials;
Basic review of design drawings, design & operating parameters, previous failure and maintenance history;
Perform condition assessment and remaining life assessment based on the findings of above investigations.
Preparation of a report covering results of all above investigations, results of life assessment and recommendations for any suitable actions to be taken for safe operation of the component.
The client required a comprehensive report covering all the metallurgical analysis to evaluate the condition and life assessment of the tubes and to characterise any observable damage.
For more information on our Life Assessment services please click here.