Other failure modes to consider for dryers with extended design life
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For pressure vessels whose design service life has been exceeded, how should failure modes be considered? Taking the drying drum as an example, what needs to be considered? The more detailed, the better; it’s even better to specify a particular component. By the way, I’d like typical dryer drum structure drawings, thank you.
What additional inspection items are required for the ultra-long-life dryer drum inspection compared to the inspection during its normal service life? What is the basis for the increase?
Conduct more magnetic particle and hydrostatic tests; there are no welds either, so check to see if there are any cracks at the root.
Additional inspection items have been added in accordance with TSG 21-2016; equipment that exceeds the specified limits is generally scrapped and replaced. If its value is high enough, an RBI can be carried out. The group standards issued by the association are still in the draft stage for feedback; Hefei General Research Institute has done a good job in this regard, but these decisions are made independently, and the technical specifications in this area are not yet perfect. It depends on whether local testing institutions are willing to comply.
Thank you! It’s time to confirm that an oversized inspection is required. It seems too difficult to rely solely on an individual to develop testing plans.
The residual fatigue life of the drying drum is a real headache
There’s no need to create it yourself; let the technical lead handle it.
Pressure testing, magnetic particle inspection, metallographic inspection, hardness testing, acoustic emission testing
Can overdue pressure vessels pass regular inspections? If the regular inspection is passed, there should be no major problems. If one wishes to be cautious using other methods, the regular inspection mainly measures thickness and checks for defects.