How big flanges are seamless steel tubes with a diameter of 198? I checked the flange of GB9119-2010 and DN200. The minimum inner diameter is 222, which is much larger than that of my steel tube, so it can not be welded.Are there any other standard flanges to match?If there is no standard flange, what should I do to make my steel pipe welded with the national standard flange?
If the number of large, suggest you give manufacturers drawings, if not the number, I suggest you buy the DN200 welding flange when the flange with.
Why don't you score? If you don't ask for it, roll in a ring.
There is a DN175 specification in JB81-94 flange standard, 194 diameter pipe and flange diameter is 196, your pipe is 198, if you put the 196 inner diameter of the car, the car has become an inner diameter of 200 or 202, you can. There is standard checking in this way.
