Can pressure pipeline materials be removed and reused? What is the proportion of carbon steel pipelines that are removed and reused for material retesting?
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I feel like it’s illegal. If it is not illegal, can it be handled in accordance with the relevant regulations of 20801.4-2020? GB/T 20801.4—2020 5.3 Material inspection: For pipeline components made of chromium-molybdenum alloy steel, nickel-containing low-temperature steel, stainless steel, as well as nickel and nickel alloys, titanium and titanium alloys, the content of major alloying elements shall be checked prior to use by means of spectral analysis (PMI) or other methods; such checks shall meet the following requirements: a) For GC1-grade pipelines, the number of samples to be inspected shall be 10% of each batch of products, with a minimum of 1 pipeline component to be inspected ； b) For other pipelines, 5% shall be sampled from each inspection lot, with no less than 1 pipeline component. Note: Each inspection lot refers to a batch of pipe components or materials with the same furnace batch number, the same model and specifications, and delivered at the same time.
20801.2-2020 4.2.3 Materials of unknown grade shall not be used in pipeline components. 4.2.4 Recycled materials shall not be used in pipeline components. This post is closed
Pressure pipeline materials can be removed and reused, but they must undergo re-inspection and meet the relevant standard requirements. Regarding the dismantling and reuse of carbon steel pipes, the specific proportion of material re-inspection must be determined by taking into account various factors such as relevant standards, the material composition of the pipes, and the operating environment. If illegal activities are involved, it is not possible to handle the matter in accordance with the regulations; relevant laws and regulations must be obeyed. GB/T 20801.4-2020 specifies that for pipeline components made of specific materials, spectral analysis or other methods must be used to determine the contents of the main alloying elements, and it also sets requirements regarding the number of such inspections that need to be carried out. .
Recycled and reused items cannot be used directly; usually, they need to be modified first and a material list is generated. Of course, it’s made of stainless steel; carbon steel won’t do