Re: Flange Calculation

From: <Christopher>
Date: Thu May 25 2006 - 11:51:00 EDT

On May 25, 2006, at 4:20 AM, Mohammad Danish wrote:

> The results say the flange joint is leaking/unsafe.These calculation
> are done by ASME Sec VIII div 1 Appendix-2 & S
If your flange actually is leaking there are a number of reasons over and above the lack of rigidity. Go back to Appendix S, take a look at the relationships for the rigidity index and change the things that are most practical for your situation. You can't very well change the flange thickness unless you're designing a custom flange. You can change the Mo value by changing the gasket type which will affect the value of Hg. You might also be able relocate the gasket.

One thing you should note is that the use of Appendix S isn't mandatory and Sub-part S-2 points out that you need to use the relationships in the light of judgment and experience. It also points out that the relationships are no guarantee against leakage. So you should know something about flange design besides just how to run CAESAR.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=g73S7ZXArEeYnzLp3Gs3PjhCbpRicbhZaDQvZLyq8Iw1hzE8lGJAT7flU6nWb8Yz2DozXN7D8XHNVIo-">chrisw@skypoint.com</a> | this distance" (last words of Gen.

.......................................| John Sedgwick, Spotsylvania

1864)
<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a> Received on Thu May 25 11:51:00 2006