How often should the welds of the high-temperature, high-pressure main steam pipes in power plants be thoroughly inspected?
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This post was last edited by zhaoqingsheng on 2017-3-13 at 15:24. Question: How often should the welds in the main steam pipes of thermal power plants be thoroughly inspected? Are all welds to be inspected? Or should only some of the welds be sampled for inspection? What specific tests need to be done? What are the standards in this regard? What is the inspection cycle, in years? Before inspection, is it necessary to remove the insulation from the main steam pipeline entirely? What kind of institution can conduct such tests? What qualifications are required for a testing laboratory? Additionally, the location of welds needs to be marked outside the insulation layer. What standard should be used for these marking symbols indicating the weld locations?
It’s the same as the annual inspection for industrial pipelines
I have been in contact with too many power plants, and not many of them are inspected every year