SAWH weld coefficient
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This post was last edited by anguanghui1 on 2018-4-2 at 11:55. Why is there no weld coefficient for spiral-welded submerged-arc welded steel pipes in GB/T 20801? Is the coefficient of this type of steel pipe the same as that of straight-seam steel pipes? I would appreciate some guidance from experts, thank you!
GB/T 20801 applies to pipelines used in industrial applications, including various types of welded and seamless pipes. For the manufacturing of welded steel pipes, there are specific standards such as SY5037 or GB 9711, which specify requirements regarding weld coefficients.
;I’ve never seen submerged arc welding for P-spiral welding. . .
There is no weld coefficient specified in GB/T 3091 and SY/T 5037 either!
Yes, see the red circle in the image above
SY/T 5037-2012 Submerged arc welded steel pipes for general fluid transportation pipelines
The 2006 version of 20801 does not have spiral welds, and it is used very rarely. However, the new draft for feedback has already included the helical seam of 5037. Additionally, one can refer to sh3059 or asme 31.3; both standards cover spiral welds, and it can be seen that the welding coefficient for spiral welds is the same as that for straight welds.
Thank you, expert! I haven’t even seen the draft for feedback. Could you send me one? Thank you, an_guanghui@163.com
Go and check it on the official website of the National Technical Committee for Standardization of Boilers and Pressure Vessels