Re: TRIM 13 CR

From: <sabirap>
Date: Wed May 14 2008 - 07:47:00 EDT

Dear Mr. Mahavir,

The Vendor offer

For Check Valve

	 BODY     - A216 WCB
         SEAT RING   – A105 + Stellite
	 DISC 	    - A105 + 13% CR
	 HINGE     - A216 WCB

For Globe Valve
         BODY     - A216 WCB
         SEAT RING   – A105 + Stellite
         DISC 	    - A105 + F6a
	 BACK SEAT   - A182 F6a

Thank you,

Regards,

Sabir
--- In PipingDesign@yahoogroups.com, "Mahavir Prasad" <mahavir.prasad@...> wrote:
>
> Dear Sabir,
>
> May I draw your attention to API-600 or ISO 10434 - more
specifically
> clauses related to materail of Trim i.e. Clause 6.2.1 and Table 12
> (Materials for Parts). Against Seat Ring (which is a part of
trim), it says
> 'when weld deposited facings are used, the base material shall be
of similar
> corrosion resistance as the body material'.
>
> So, if you have asked for 13% Cr Trim for a valve where the body
material is
> CS, the seat rings can be A105+13%Cr. What the vendor means (and
you may
> like to get it confirmed from him) is that he is offering seats of
base
> material A105 with 13% Cr weld deposit.
>
> Regards,
>
> Mahavir Prasad
> Consultant, Piping
> On Wed, May 14, 2008 at 2:14 AM, Christopher Wright <chrisw@...>
> wrote:
>
> >
> > On May 13, 2008, at 8:19 AM, sabirap wrote:
> >
> > > The Vendor is offering A105 + 13% CR. The Vendor justify that
13 CR
> > > is an alloy steel with and combination of CS & Chromium 13%.
That
> > > means A105 + 13% CR is 13 CR.
> > I've never heard someone explain something in quite these terms.
I
> > don't think the guy knows what he's talking about or he's trying
to
> > pull a fast one. I'd have nothing to do with that outfit. 13Cr
is an
> > alloy steel roughly 410 stainless steel. SA-106 is carbon steel.
You
> > can't just mix the two like you'd mix gin and vermouth--in that
case
> > you'd have a martini, not gin, not vermouth, but a cocktail.
> > >
> > > Is it right…..
> > run away.
> >
> > > Could you please explain to me the composition of 13 CR, 18 CR
etc?
> > > Where can I find these details?
> > Do a web search on stainless steels or get hold of some reference
> > books from ASM. You can also do a little more specialized search
by
> > looking through Section II of the ASME Code and see what all the
> > various specs and nominal compositions are and read the
individual
> > specs.
> >
> > Christopher Wright P.E. |"They couldn't hit an elephant at
> > chrisw@... | this distance" (last words of Gen.
> > .......................................| John Sedgwick,
Spotsylvania
> > 1864)
> > http://www.skypoint.com/~chrisw/
> >
> >
> >
> > ------------------------------------
> >
> > =========================================
> > PipingOffice - Excel Spreadsheets for Piping Calculations
> > http://www.pipingoffice.us/
> > =========================================
> > Main site: http://www.pipingdesign.com
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
Received on Wed May 14 07:47:00 2008

This archive was generated by hypermail 2.1.8 : Tue Mar 09 2010 - 00:21:26 EST