Number of circumferential welds on the steel pipe
Thread Content
For the circumferential welds of large-sized steel pipes, what size is required to have such welds? How many circumferential welds are allowed at most? Are there any standards specifying this?
Are you referring to T-joint welding? Take a look at GB/T 3091
I don’t understand what you mean by \"ring weld\". Generally, steel pipes, flanges, tees, and similar components all require ring welds, and it seems to have little to do with the diameter of the pipe
Is it the circumferential weld formed during manufacturing or during installation?
Look at your standards. . . If it’s not specified in the standards, then put it in the procurement requirements. . Since the procurement requirements aren’t specified, we’ll follow the standards of other factories
You don’t mean large-diameter pipes, i.e., welded pipes, where the length is insufficient, so the manufacturer welds two sections together. It seems like there’s no requirement for this.
I don’t understand what is meant by circumferential welds here – aren’t circumferential welds required between fittings and pipes, as well as between pipe segments?
That’s exactly what he asked. . . For example, a length of 6 meters per section can be customized, and the presence of circumferential welds is allowed. . . This is definitely allowed. . As for whether it is not allowed, or to what extent it is allowed, or things like spiral welded pipes, you need to specify these in the procurement requirements. .
Are you asking what the minimum distance that must be maintained between two adjacent circumferential welds at a site is? If it’s this question, then **the answer is: Yes – the minimum distance between two adjacent butt welds on large-diameter pipes is not less than the pipe diameter, except in cases where finished pipe fittings are used.
If it’s your question, **it’s not entirely correct**
Large-diameter ones generally refer to those with DN600 or above, I guess. Please advise