Re: ANSI Class 125 Flanges

From: <elie>
Date: Mon Sep 19 2005 - 23:26:00 EDT

get hold of a copy of ANSI B16.1

Excerpt:

ASME3/ANSI B16.1: “Cast Iron Pipe Flanges and Flanged Fittings,” Class 125 only. The maximum allowable pressuretemperature ratings for these flanges range from 50 psi to 200 psi (refer to the standard for specific ratings).

• Christopher Wright <chrisw@skypoint.com> wrote:

>
> 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
> chrisw@skypoint.com | this distance" (last words
> of Gen.
> .......................................| John
> Sedgwick, Spotsylvania
> 1864)
> <a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a>
>
>

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