HGT20615 flange question
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1. The inner diameter size of the WN flange in 20615 is "Sch". Are there any selection principles? Is there any requirement for a minimum value for "S" similar to the 20592WN flange? 2. The thickness of the 20615 flange, as shown in the diagram, does not include the height of the sealing surface? I have never come into contact with class flange:Q
sch is the pipe wall thickness corresponding to the American standard. The thickness is different depending on the suffix. See upstairs for details.
:L actually has this watch, thank you.
:victory: ok, thank you
"Sch" is a method of expressing wall thickness by pipe number. The pipe number is the ratio of the design pressure of the pipe to the allowable stress of the material at the design temperature multiplied by 1000 and rounded. That is: Sch＝P/t×1000 wall thickness grade: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 ten levels.
Where does this formula come from? I never noticed it before.
That's what it should mean. But I forgot where I saw it.
I think what the poster is asking is how to write pipes and flanges in the statistics of equipment materials. This is the same as our European standard flanges. For example, the European standard flange of DN50 20# steel pipe is written S=6, which represents the wall thickness of the pipe welded to the flange. In the American standard, the size of SH3405 steel pipe is written as Sch80, and the wall thickness including 6 is selected. We have always marked it like this. If there are any mistakes, you are welcome to correct me.
I'll make it up when I remember it again, learn* study *
This post was last edited by zjq1962 on 2018-12-20 15:51. This formula is called Barlow's formula. It originally came from the ASME pipe fittings standard. Due to the large error, it is no longer included in the current standards.