Re: ANSI B16.5 Flange - Gasket Face Machining Allowance

From: <Christopher>
Date: Wed Aug 08 2007 - 11:54:00 EDT

On Aug 8, 2007, at 6:31 AM, John Luf wrote:

> Absolutely true statement " fact the Piping Codes apply to new
> construction"... ASME has Published some PCC codes PCC is Post
> Construction Code. in these you will find advice on various
> patching methods etc,

Thanks, John--I over-generalized. The ASME also has some in-service inspection codes, which I have never used, but but I daresay they're concerned with practicably maintaining the safety margins of new equipment. The National Board also maintains repair codes.

It must have been a helluva blown gasket if the flange needs repair. Probably fair to add that the raised face height doesn't actually enter into the ASME Code stress calculation--you can probably do anything you want with it, provided the ring thickness dimension (T, I think) isn't reduced.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=OUTBpyuGY51cE_E3x0VBII3-9-HeOKPlYiHaJP5X89qQP3X3FF11LOjBloNWv0p-z5IZbnvWXkNlcp8sBg">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 Wed Aug 08 11:54:00 2007