Where did our xx procurement department buy the HG5010-58 flanges?
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Where did our xx procurement department buy the HG5010-58 flanges? The flange I bought, model HG20592, is also smaller and thinner than the dimensions specified in the standards. Is it really necessary to save a few dollars by using such a flange? It’s become messy; aren’t the flange standards HG5010-58 and JB81-94 no longer in use? Is it illegal to use flanges that meet these two standards? Where can I download these two standards? It’s really absurd! !
Now most use the Ministry of Chemicals standard 81-94; I have 15731745238 here
HG5010-58 is JB81. Dimensions of Series 2
It’s best to take a photo so we can learn together* and warn everyone. Using the term \"discontinued\" is not quite appropriate; when a standard document no longer matches the actual situation and can no longer be applied, it needs to be updated or replaced, and the original standard becomes invalid. Flanges generally have alternatives. When a regulatory document is not in line with higher-level laws or other documents, and there is no necessary alternative, it must be repealed. In such cases, two technical terms are used: \"revoked\" and \"repealed.\" Revocation occurs when the document is replaced by new standards or regulations, while repeal happens when there are no longer any conditions under which the document can be applied. For example, with the disappearance of pagers, the related standards were repealed; as for flanges, there are always newer alternatives available, so old specifications are replaced and thus considered revoked. When making purchases, it is necessary to follow strictly the technical requirements specified by the technical experts. As for why products based on the 1958 standards were purchased, it is likely that the buyers were deceived by unscrupulous sellers. In the chemical industry, the applicable standards are currently HG/T 20592-2009 (PN) and HG/T 20615-2009 (class); sometimes American, Japanese, or Chinese standards may also be used. Flanges used in the machinery industry are very rarely utilized in the chemical industry.
In our design, the use of obsolete specifications is prohibited; in the petrochemical industry, we uniformly use standard 20592 or petrochemical specification 3406 – which are smaller and thinner. Have you picked the wrong series?
They are old books; there are many new norms and standards to choose from