Should titanium plates and titanium tubes be manufactured in accordance with the new standards or the old standards?
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NB/T 11270-2023, the standard for titanium pressure vessels, came into effect on November 26, 2023. The standard for titanium plates referenced in this standard specifies the year version GB/T3621-2007, yet this standard was replaced by GB/T3621-2022 on May 1, 2023, meaning the original standard is no longer valid. The same applies to titanium tubes and titanium welding materials – all of these refer to old standards. When designing equipment, the local special inspection agencies consider it necessary to use the old standards, arguing that designing using the new standards is incorrect; P;P;P
For referenced standards with a publication year specified, only that version shall be followed
The problem is that materials related to the obsolete standards might no longer be available on the market.
Titanium plates and titanium tubes should be designed in accordance with the new standard GB/T3621-2022. Although the NB/T 11270-2023 standard for titanium pressure vessels references the older standard GB/T3621-2007, standards that have been discontinued should be updated to the latest versions. It is necessary to communicate with the local special inspection agency to explain the necessity and rationality of the new standards. .
The question is, since the standard has been revoked, can it still be purchased? The same is true for the reference to standard GB6479-2000 in GB150.2 version 11; only substitution of materials is possible.
The standards indeed state that when citing versions with a year indicated, the revised version shall be taken as the standard
For referenced standards with a publication year specified, only that version shall be followed