Re: ANSI Class 125 Flanges

From: <Christopher>
Date: Mon Sep 19 2005 - 22:55:00 EDT

On Sep 19, 2005, at 5:15 PM, Geoff Stone DD&D Australia wrote:

> My question relates to this classification. I thought that Class 125
> was a flat face version of ANSI Class 150 and was generally used for
> cast iron valves in water service in the petrochem, mining or water
> industry. Can Class 125 be used in a facility designed to ASME B31.3
> on hydrocarbon service? Please offer comments.
>
> Also what is the rating of Class 125 at temperatures below 100F?
My old Taylor Forge catalog shows Class 125 and Class 125LW with the notation that they mimic a cast iron standard Class 125, except they're made from SA-181. They're used to mate with flanged valves made up to mate with cast iron flanges. Strictly speaking there is no class 125 steel flange standard, so I suppose there's no rating either, since they're made from steel. Simple enough to do an ASME Code stress calculation for them.
Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=C0dRA-AEEkP6YEqftgjoodDlvLevAPlbSY40QH0f_5wJZI2T-23BWGPIkuZl38917JbQlmh0Em5iRis">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 Mon Sep 19 22:55:00 2005