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In general, we can say that there are two circumstances:
1) According to the frequency specified by the applicable standard (AMS2750, CQI-9, API)
2) When a modification is made to the equipment.
Here it is important to be clear about the word “modification”. In general terms, a modification is an alteration or adjustment that could affect the thermal characteristics of the equipment.
Both #AMS2570 and #CQI9 provide very clear guidance on what is a modification and what is not. Some examples of equipment modification:
If you want to learn more about these standards, you can follow the blog of Global Thermal Solutions LLC to find useful articles related to #heattreatment management.