RT extended shot
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I would like to ask everyone: there is a container, and the design, manufacturing, and inspection standards are in accordance with NB/T47003.1 for steel atmospheric pressure containers – grade III is considered acceptable under these standards, with a requirement of 10%, but the customer has increased this requirement to 20%. Currently, there are defects exceeding the specified limits in the circumferential seam. According to the previous GB150 standard, expansion testing was required, but upon reviewing the 47003 standard, I found no mention of such expansion testing. Is it therefore not necessary to conduct expansion testing, and is it sufficient to carry out repairs until the defect is resolved? I’m not sure whether my expanded shots meet the standards; I’ve read the definition of those standards as well, but I’m worried that I might have missed something, or that there are other changes to the standards. That’s why I’m seeking advice from everyone here. I want to avoid additional filming and external inspection services; if there are still defects after the additional filming, it will be troublesome as the deadline is very tight. I’m wondering whether the standards for atmospheric pressure vessels consider the final inspection of the equipment to be a pressure test – I would appreciate it if the experts could provide an answer.
Look at what defects! No need for repair! Improve the quality of one set of images! Check the result!
If there are many repairs needed, it should be set to 100%; otherwise it represents a potential risk. I also had 20% in the past, but good cracks were detected later on, so it was changed to 100%
First, it is manufactured in accordance with the standards for atmospheric pressure vessels; there is a difference between atmospheric pressure vessels and pressure vessels, but the goal in both cases is to ensure product quality and safety. Secondly, the skill level of your welders needs to be improved; there are significant differences between welding that requires flaw detection and welding that does not. Furthermore, since the client is requesting higher standards for flaw detection, this indicates that high requirements are placed on welding quality; there is also a possibility that the equipment used is of lower quality. Therefore, it is recommended that you take photos of everything, as the quality of your welding is rather poor ； If the cost of the equipment materials is not very high, it is recommended to manufacture a new unit to ensure welding quality; one X-ray inspection will be sufficient to guarantee both the welding quality and the safety of the equipment. If the material is stainless steel and too many repairs are carried out, the material will lose its properties, and the quality of the welds will not be guaranteed.
GB150 is a standard for pressure vessels; what you are manufacturing is not a pressure vessel, so it falls under a different standard. When the client requests a specific flaw detection rate, it means that you need to meet both the manufacturing standards for pressure vessels and the requirements set by the client in order to complete the delivery.
In addition to the manufacturing standards, there are additional requirements specified in the technical agreements； It wasn’t specified in the agreement, but the customer asked for it later; you should resolve it through negotiation – it’s basically a matter of cost and delivery time