Roughness requirements for the acceptance of metal pipe fittings
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The company purchased a batch of stainless steel pipe fittings, and there was a lot of welding slag stuck to the inner walls of the pipes, which was difficult to remove. Are there any standards regarding the roughness of metal pipes and fittings? After checking the relevant standards, no requirements were found regarding roughness.
It’s sufficient to ensure internal consistency. These are used pipes, taken from old equipment that was cut using plasma cutting; they’re cheap, so manual cleaning is required.
This pipe definitely can’t be used; we need the manufacturer to take it back and deal with it. I just don’t know if there are any specific standards for specifying the surface finish
No specific standard is needed; what matters is that the inside of the pipeline is not contaminated. It’s like when you buy carrots with soil attached to them – it’s just a matter of acceptance. There is a problem with your sourcing channels; for example, such pipes are supposed to come with a factory certification – do you have one? Actually, if you’re not the purchaser, it’s better to let the purchaser explain this issue. This tube is one that has been removed and used; just make do with it. If it goes up to the boss, haha, then you’ll have to put out the fire. If you don’t believe it, give it a try and see: lol I plan to post the result later:P
The pipe contains welding slag; if this slag falls off later, it will first damage the valve seals or affect the quality of the product. At the very least, this section needs to be cut off
It’s definitely no longer usable. However, regarding the procurement and inspection of pipes, there has indeed been no requirement regarding surface smoothness, nor any consistent standard; therefore, it’s best to have standards in place to specify what level of smoothness is required. Structural steel pipes do have requirements regarding their surfaces, but since there are no such regulations for pipes used in fluid transport, it’s quite confusing
It’s clearly oxidation slag left over from plasma cutting; it has nothing to do with roughness. The original fittings shouldn’t have this problem; moreover, since they aren’t socket-welded fittings, why is there no bevel?
You’re referring to a fundamental issue: in official procedures, a certification is an essential requirement; as for second-hand pipes, it’s not possible to trace their material or the manufacturer
It has nothing to do with roughness. . This is the splatter generated by cutting
Spattered slag is also acceptable; the key point is that there’s no standard requirement stating that slag must not be present. So how should we evaluate it during inspection?
Spattered slag is also acceptable; the key point is that there’s no standard requirement stating that slag must not be present. So how should we evaluate it during inspection?