Issues related to the supervision of pressure vessel head manufacturing – a well-known topic
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Since the production of end caps was discontinued, there remains a question without an answer: since end cap manufacturers no longer need to have A3 certification, what are the requirements for inspection of end caps with seams? Can any manufacturer produce it?
A characteristic of China is that end cap manufacturers do not require a license, but end caps with seams must undergo supervision and inspection: victory:
Confused; I just can’t figure it out, and the authorities haven’t provided any explanation either.
If the seams of the spliced head are fabricated by the head manufacturer, supervision and inspection must be commissioned, along with a supervision certificate and a non-destructive testing report; otherwise, only a certificate of conformity is required.
\ud83d\udc64 What are the requirements regarding the resource conditions of the head manufacturing plant for supervision and inspection? Is a qualification for manufacturing pressure vessels required? Thank you!
End cap manufacturers no longer need to obtain A3 certification, but they can entrust third parties for inspection
This post was last edited by Buddha and Orchid on 2020-4-14 at 11:40. According to TSG21-2016, as shown in the diagram, heads with welds also require mandatory manufacturing supervision and inspection, rather than entrusted inspection. As a side note, the Amendment 1 to the Solid Content Regulations, which was recently made public for comments, includes all end caps – whether they have welds or not – within the scope of supervision and inspection. It is evident that the State Administration for Market Regulation has realized that previously excluding seamless heads from the scope of licensing and abolishing supervision inspections was too hasty, and therefore it aims to impose even stricter controls.
It can be implemented in accordance with the new clause of TSG 21 6.1.2.1 (3). It’s clear now.
You say the headquarters is acting rashly; I think it is your remarks that are rash. The experts at the headquarters are no worse than anyone else – perhaps they have been away from the front lines for too long and therefore haven’t considered certain issues thoroughly, or maybe they have had to make such decisions due to pressure from higher-ups.