I have a question regarding the pipe diameter
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I would like to ask everyone: GB8163 applies only up to DN600. For 20# steel pipes larger than DN600, which standard should be used? GB14976 is applicable only up to DN400; for 304 pipes larger than DN400, which standard should be used? . .
ASME B36.10 specifies 80"/DN2000.
Well, as I recall, the 508 model uses welded pipes, usually those with a wall thickness exceeding the SCH value. . .
For pipes larger than DN500 here, we roll and weld the plates ourselves. One is cost considerations, and the other is the inconvenience of procurement
So how do you control the ellipticity and thickness reduction? Is it a coil winding machine with three cylinders, or a coil winding machine like UOC that uses molds?
It’s a regular three-roller plate rolling machine; the thickness reduction is achieved by increasing the thickness during material cutting, and the ellipticity is checked using curved plates before making corrections. Our pressure is not high; it’s generally within 0.3 MPa
Oh, we deal with structured coiled tubes, and it’s quite difficult to control their ellipticity.
There are standard welded stainless steel pipes. . GB/T12771
I’m asking about the standard execution procedures, not what’s written in the standards. . .