why it is essential to do flange leckage calculations
in case 12inch & above line sizes . during stress
analysis .
Thanks Paul
generally I find many isos misleading, trying to show
a 3D object in 2D
space with only one view is asking for trouble .
However I'm not the
only one as I am forced, through history, to allow 10%
rework budget on
dimensioned isos which sometimes arrive with new plant
items. Give me
orthogonal projections any day; perhaps with an iso to
clarify.
Bet this gets up someones nose.
I'm off on my first vacation for 10 years (Oz, where
else?) starting
tomorrow, and lasting for 10 whole days. Please feel
free to stick the
knife in as frequently as you like during my absence;
the highest tech
device I am taking with me is an abacus and I will be
restricting my ISP
inmail buffer to 16K. Unless you know the secret
handshake.
Cheers
Steve
-----Original Message-----
From: ebyc75 [mailto:ebyc75@yahoo.com]
Sent: Friday, April 08, 2005 10:20 AM
To: <a href="/group/PipingDesign/post?postID=POn_KiJzIqZmR1YHqsxYM-zAm9fl3UIwpDf510yX36x4FqasvT7FPAhlrkPEnDehL8pttzVOReE4UVC0AfbZC48TXOc">PipingDesign@yahoogroups.com</a>
Subject: [PipingDesign] Re: Dimensioned Isometrics
- In PipingDesign@yahoogroups.com, Paul Bowers
<pbowers@p...> wrote:
> Steve McKenzie wrote:
> >
> > Gents+2
> > I have just had a friendly discussion with a South
African
colleague
> > who maintains isos are normally dimensioned and
are used as part
or the
> > formulation of the Schedule of Quantities; BOM;
whatever. My
> > experience with isos is that they are comics that
we give to
the
> > pipefitters as a rough guide. Occasionally I have
used
dimensioned isos
> > to display fixed and toleranced dimensions around
critical plant
for
> > shop spooled piping, but in general I just use
them as a sort of
road
> > map. We are not talking 3D CAD here.
> > My question is do you guys normally put dimensions
on Isos, and
if you
> > do what sort of plant do you normally work with?
>
> As far as I can see, the only purpose of a
non-dimensioned iso is
to
> give a general idea of the routing (as you
mentioned). Sometimes
I'll do
> large, roughly-dimensioned fluid system isometrics
on 24"x36"
sheets
> by hand for preliminary pressure drop or stress
analysis.
>
> I presume you are talking about projects with not
too much piping
> involved where you have good fitters and welders and
can oversee
the
> work being done.
>
> These days isos are generally auto-generated and
dimensioned from
the
> model/database and look like crap (in my opinion).
>
> Paul
I work in oil&gas plants and all the iso's are
dimensioned and also
MTO is provided on each sheet
Eby
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Received on Sun Apr 10 02:20:00 2005