Dear Everybody,
In the past week I have read all kinds of dissertations about
dimensioned isometrics.
I suppose there are many uses for piping isometrics, but I can only
speak from my own experience.
We are a Design and Build Company and we fabricate 90% of our piping in
our shop which are shipped
and installed in automotive plants all over the USA. Our Company prided
itself as a Modular Build
outfit, meaning all we have to do in the field is to connect our shop
fabricated/engineered assemblies.
Only 10% of the job is left for the field personnel to think about,
mostly threaded runs (2" and smaller)
and some miscellaneous field cuts. This is how we do piping isometrics :
1.) Our Engineering Group make the piping layout, sections and detail drawings. It's important that these
layout and sectional drawings are to scale and up-to-date.
2.) From these layout drawings we prepare our fabrication/isometric drawings. These are not scaled drawings,
so it is important that they be dimensioned. In the olden days, they call these spool pieces, in our shop
we call these fabrication assemblies.
3.) Each fabrication drawing is made from an 11" X 17" sheet and the size of the assemblies we make are usually limited
by these size. It's Fabrication Drawings are tagged(for easy reference) and it's one would have the following:
(1) Each and every component description as to size, quantity, full technical description/specification.
(2) The tagged straight pipes with corresponding size, quantity, length of cut, ends of cut( BE, PE, etc)
and full technical description/specification. In cases of field welds, we usually allow extra length
on the pipe to be cut to suit at the job site.
Note : The Fabrication Drawing is arranged so that all these different components are clearly readable by the shop
fabricators, keeping in mind that the lighting in the shop is not as good as the office, plus the eyesight
of welders deteriorate rapidly in time.
4.) After the normal routine of Iso Quality Control Checking, these Fabrication Drawings is released to the Fabrication
Shop. These is how the Fab Drawings are utilized :
5.) End of Book
Hope this helps,
ed
-----Original Message-----
From: Dacharaju Krishnamohan Rao [mailto:dk_rao@qp.com.qa]
Sent: Wednesday, April 13, 2005 11:53 PM
To: <a href="/group/PipingDesign/post?postID=zZvpfxGlLvmzypjuCi_dHsW8PFXjjDzdwXdLqxe_Xjreb5cqmiPc1W-BUEizGBzZe00-r7rAUt4UB1fHClX1eaIX2A">PipingDesign@yahoogroups.com</a>
Subject: Re: [PipingDesign] Dimensioned Isometrics
Mr Paul,
I agree with you that isos are made to fit to field.I was talking about
about "Field Welds Location" verification by Field staff and not
dimensions.
With best regards,
D.K.M.Rao.
Paul Bowers <pbowers@pipingdesign.com>
04/14/2005 02:14 AM
Please respond to
<a href="/group/PipingDesign/post?postID=zZvpfxGlLvmzypjuCi_dHsW8PFXjjDzdwXdLqxe_Xjreb5cqmiPc1W-BUEizGBzZe00-r7rAUt4UB1fHClX1eaIX2A">PipingDesign@yahoogroups.com</a>
To
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cc
Subject
Re: [PipingDesign] Dimensioned Isometrics
Dacharaju Krishnamohan Rao wrote:
> In addition to the information as indicated by Mr Adolphus, the FIELD
WELD
> locations are also shown by some of the consultants in Engineering
phase
> which are usually verified (changed if required) by the field
peronnel.
No way. All piping isos are perfect and fit exactly in the field as drawn. Seriously, though...
Also, mark numbers for individual spools, field trim allowance, correct valve handwheel orientation, correct pressure seal direction for valve seats, high point vents and low point drains, consistent north arrow, heat tracing, notes relating to instrumentation design standards, orientation for HP/LP connections on orifice plate installations, flow direction, X-Y reference to a nearby structural column, instrumentation bubbles, related P&ID/model/piping GA reference, control valve default state, etc.
Paul
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