Should the new standards or old standards be applied during the renovation or maintenance of pressure pipelines?
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As is well known, relevant standards are constantly being updated. Therefore, in our operations we will surely encounter the need to modify or repair pressure pipelines. The question is: should we follow the original standards from the project construction phase, or the current standards? For example, for the same specifications under the same temperature conditions, the allowable operating pressure specified in versions 97 and 2009 of the HG/T 20592 standard differ significantly. Therefore, during renovation or maintenance, should we replace the old materials according to the original specifications, or should we purchase materials with new specifications (different wall thicknesses) in accordance with the requirements of the new standard? :)
Design changes should be proposed according to the circumstances.