How to determine that a self-made pressure vessel does not comply with **specification standards?
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There is a horizontal pressure vessel for which no design or manufacturing documents are available; it is clearly a self-made unit. The equipment flange is formed by welding steel plates together, and grooves made of welded steel strips are provided on it for sealing purposes ； The end cover flange is also welded from steel plates, and the end cover body is made by welding steel plates together to form a shape similar to a cone ； The support is a triangular structure made by welding several channel steels, and it is directly welded to the tank body ； Bolt holes are provided between the equipment flange and the end cover, which are fastened together with bolts ； Both the front and back are end cap structures. I would like to ask the experts how to explain why this device does not meet the **specification standards? Apart from the design and manufacturing documents that must comply with the safety inspection regulations for fixed-pressure vessels, are there any structural aspects of the equipment manufacturing that do not meet the standard requirements? I seek your advice! !
What are its operating conditions?
Operating pressure is around 0.15 MPa, temperature is around 110 degrees, and the medium is steam
It depends on the drawings; there are specific qualification requirements for the design, manufacturing, and use of pressure vessels. Self-made vessels cannot be used in industrial applications, but they can be used for experimental purposes.
Where did you get the blueprints for the homemade one?:L
Article 32 of the Law of the People’s Republic of China on Safety of Special Equipment: Users of special equipment shall use special equipment that has been manufactured with a license and has passed inspection. Article 84: Where a special equipment user violates the provisions of this Law and commits one of the following acts, they shall be ordered to cease using the relevant special equipment and shall be fined not less than 30,000 yuan but not more than 300,000 yuan: (1) Using special equipment that has been produced without a license, that has not undergone inspection or has failed such inspection, or special equipment that has been explicitly designated for retirement or has already been scrapped ； (II) When special equipment malfunctions or exhibits abnormal conditions, and no comprehensive inspection is carried out to eliminate potential hazards before continuing to use it ； (III) Special equipment has serious accident hazards, is of no value for renovation or repair, or meets other conditions for scrapping as specified in the safety technical regulations; yet the obligation to scrap it in accordance with the law has not been fulfilled, and the procedures for canceling the use registration certificate have not been carried out.
This company is really bold – how dare they use pressure vessels that lack drawings, manufacturing process documentation, and inspection certificates; products with none of these essential elements at all? !
Without the necessary qualifications, relevant technical documents, or manufacturing and inspection process documents, and with incomplete completion records – how can it not be considered a violation?
You can take a photo and send it over; we’ll all take a look and analyze it from a structural perspective
Homemade. . . Design qualifications? Manufacturing qualifications? It seems none of them might be available. . That is not in line with the **standards**. . Provide the design pressure and volume to see if it is regulated. . .
Thank you to all for your replies and generous help! Actually, I understand what everyone has said in their replies. I work in the field of pressure vessel inspection, and when encountering such equipment at work, I try to focus on more professional aspects such as structural design and component arrangement, setting aside obvious factors like design and manufacturing qualifications. It might be difficult to explain these issues clearly without on-site photos. When I have time to upload a few pictures, everyone can take another look at them! At this stage, it is still necessary to respect customers. . . . .