Re: [PipingDesign] Re: Welding of unequal thickness pipe to pipe/fitting

Richard & Mail

Thanks for clarifications, appreciate it

Khaled

• melvin_magbanua <melvin_magbanua@yahoo.com> wrote:

> Yes Khalid, Richard is correct and to support his
> statement, refer
> to the next page still part of Fig. 434.8.6(a)-2,
> under "INTERNAL
> DIAMETERS UNEQUAL" item 4 ("Where the nominal
> internal offset is
> more than 1/2 the wall thickness of the thicker
> pipe,. . . . .")
> this answer for this particular case "if you want to
> weld schedule
> 40 pipe to schedule 80 or 160 elbow which is more
> than 1.5t".
>
> Hope this answer your question.
>
> mail
>
> --- In PipingDesign@yahoogroups.com, Richard Beale
> <r_beale@...>
> wrote:
> >
> > Hi Khalid,
> > Fig.434.8.6(a)-(2) (b) does not limit the wt of
> the adjoining pipe
> to
> > 1.5t. The code is stating that for design purposes
> you can only
> take
> > into consideration 1.5t, i.e. stress calculations.
> Your adjoining
> pipe
> > can exceed 1.5t and the taperbore is as noted.
> Other members
> please feel
> > free to add/correct my comments. I am not, nor do
> I profess to be,
> an
> > expert in code application.
> >
> > Richard B
> > Calgary, Canada
> >
> > -----Original Message-----
> > From: PipingDesign@yahoogroups.com
> [mailto:PipingDesign@yahoogroups.com]
> > On Behalf Of Richard Beale
> > Sent: March 20, 2008 10:17 PM
> > To: PipingDesign@yahoogroups.com
> > Subject: RE: [PipingDesign] Welding of unequal
> thickness pipe to
> > pipe/fitting
> >
> >
> >
> > Hi Khaled,
> > I'm at home right now, but I'm going to log into
> my company
> network and
> > take a look at the latest B31.4 edition. I still
> think that you can
> > taberbore the difference. Bear with me.
> > Regards,
> > Richard
> >
> > -----Original Message-----
> > From: PipingDesign@
> <mailto:PipingDesign%40yahoogroups.com>
> > yahoogroups.com [mailto:PipingDesign@
> > <mailto:PipingDesign%40yahoogroups.com>
> yahoogroups.com]
> > On Behalf Of M. Engineer
> > Sent: March 20, 2008 6:46 PM
> > To: PipingDesign@
> <mailto:PipingDesign%40yahoogroups.com>
> > yahoogroups.com
> > Subject: RE: [PipingDesign] Welding of unequal
> thickness pipe to
> > pipe/fitting
> >
> > Dear Richard
> >
> > I am refering to ASME B31.4 the latest edition
> 2006.
> > Note # 2 Under Fig. 434.8.6(a)-(2) Acceptable Butt
> > Welded Joint Design for Unequal Wall Thicknesses,
> > states "Maximum thickness tD for design purposes
> shall
> > not be greater than 1.5t". Furthermore, all
> sketches
> > a-g indicated under 434.8.6 (a)-(2) show
> td=t+(1/2)t.
> >
> > Khaled
> >
> > --- Richard Beale <r_beale@shaw.
> <mailto:r_beale%40shaw.ca> ca>
> wrote:
> >
> > > Hi Khaled,
> > > Mines an older version of B31.4 but I see an
> > > illustration with no
> > > reference to 1t and 1.5t. In this particular
> > > illustration the OD's match
> > > and the larger wt is taperbored at 30 degrees
> > > maximum to 14 degrees
> > > minimum (no minimum when materials joined have
> equal
> > > yield strength) to
> > > match the profile of the smaller wt. I believe
> this
> > > suits your need.
> > > Take another look at your copy of B31.4. I'd be
> > > surprised if your later
> > > version doesn't also have the same illustration
> and
> > > verbiage to
> > > transition in this way.
> > >
> > > Best wishes,
> > > Richard B
> > > Calgary, Canada
> > >
> > >
> > > -----Original Message-----
> > > From: PipingDesign@
> <mailto:PipingDesign%40yahoogroups.com>
> > yahoogroups.com
> > > [mailto:PipingDesign@
> <mailto:PipingDesign%40yahoogroups.com>
> > yahoogroups.com]
> > > On Behalf Of M. Engineer
> > > Sent: March 20, 2008 12:50 PM
> > > To: PipingDesign@
> <mailto:PipingDesign%40yahoogroups.com>
> > yahoogroups.com
> > > Subject: [PipingDesign] Welding of unequal
> thickness
> > > pipe to
> > > pipe/fitting
> > >
> > >
> > >
> > > Dear Colleagues
> > >
> > > Does ASME B16.25 specifies the welding geometry
> in
> > > case the wall thickness relation of joined
> > > pipe/fitting exceeded 1.5. The code B31.4 shows
> the
> > > geometry of up to 1.5t difference in thickness
> only.
> > > What about if you want to weld schedule 40 pipe
> to
> > > schedule 80 or 160 elbow which is more than 1.5t
> > >
> > > Khaled
> > >
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been
> > > removed]
> > >
> > >
> >
> > [Non-text portions of this message have been
> removed]
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been
> removed]
> >
>
>
>
Received on Fri Mar 21 14:54:00 2008