Regarding the surface quality of pressure vessels
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The company’s container products are often harshly criticized by clients due to their surface quality, which has left the management very annoyed. Due to the small volume of the company’s products and the fact that most of the processing is done by external contractors, these factories are relatively small in scale; as a result, surface quality cannot be ensured to an adequate level in accordance with relevant standards and technical requirements. The management ordered our technical staff to establish criteria for classifying the quality of a product’s appearance. These criteria involve artificially dividing the quality of a product’s appearance into three categories – A, B, and C – based on factors such as the project and the client. I think this is unreasonable; it’s the same product from the same company, yet different requirements are applied. Well, since it’s the management’s order, we have no choice but to comply. . . ) Grade C means meeting the specifications and the basic requirements of the owner; there’s nothing much to say about that. As for Grades B and A, it’s harder to determine what standards are required to achieve those grades – factors such as weld quality, rust removal, and paint quality come into play. . . I really don’t know how to write it. I was wondering if any of the more experienced colleagues or peers have any good suggestions or materials. I would be very grateful if you could share your knowledge. Thank you! ! ! !
JB/T4711-2003 – Take some time to look at this standard; it might be useful
The appearance quality of equipment is an important issue – one that arises frequently and can be easily resolved, yet is often overlooked. It is a systemic problem that can occur throughout the entire process, from raw materials to equipment manufacturing, lifting, anti-corrosion coating, and transportation. The key is to have someone who takes responsibility for managing this aspect with due attention, in order to reduce visual defects
Follow the **standard format! If the leader has high standards, then make your requirements even stricter than the standard ones ； It doesn’t matter if the person below doesn’t carry it out for you ；
Although appearance quality does not affect functionality, it is the face of the equipment and even of the organization.
Appearance is important; appearance lies in the details. Isn’t it often said that details determine success or failure? To be honest, formulating standards for visual quality is quite complex. Just looking at 4711 might not be very useful. It needs to be considered in the context of the entire production process; this isn’t something that can be clarified right away, or perhaps my skills aren’t sufficient to explain it properly. To be honest, if the appearance of a device is poor, its internal quality is surely not good either; that’s experience.
The visual quality of the equipment is very important; both the base material and the welded joints are equally significant. Surface defects are particularly hazardous as they can lead to stress concentration. Over time, this can result in fatigue cracks, which poses serious problems. For more details, refer to Chapter 10 of GB150: Manufacturing and Inspection.
Surface quality essentially refers to the presence of defects on the surface. 1. Flange sealing surfaces. 2. Welding defects, including excess material, which must be removed through grinding. 3. Defects on the cylinder surface; care must be taken to avoid dents during rolling. 4. Grinding of edges and corners such as those on the support legs. 5. The uniformity of the paint coating, with a film thickness of around 160 microns. 6. The cleanliness inside the container, which varies depending on the intended use of the container
The visual quality control of pressure vessels should primarily focus on controlling the misalignment of the cylinder walls, the excess height of welds, and the unevenness of the cylinder surface.
First, we need to look at the standards. Just take a look at imported products – no matter whether it’s important or not, they are all made very well. Details determine success or failure, and attitude determines everything. What the Chinese produce definitely has a Chinese style. This post was last edited by GUANGWEI8.26 on 2009-4-13 at 22:54