Thanks Geoff. Most answers from this list start with "it depends",
since it is a quite complicated field of endeavour.
I agree with you about the designers being good enough to spec out FWs according to the 8'x8'x40(?) shipping constraints from shop to field, but as you say, it is the fabricator that has the choice to shop or field fab (if the drawings are turning out to be bad, s/he may decide to go to site and renegotiate).
An existing facility is always a pain in the arse, since site owners always have opinions as to when the work should be done. This is usually based around planned maintenance shutdowns, and then the bean-counters start to calculate "lost money" if things are done not according to THEIR plans.
IMO, this is a big reason why we have too-tight deadlines, silly budgets and field extras. On the other hand, without the threatening ass-biting financial alligators, where's the incentive to complete? Some jobs seem to wander off into design theory forever, burning up all the hours during the design stage.
Paul
> It depends on the project. I have had cases where the shop
fabricator was a
> differnent organisation to the installation contractor. Off
shore work is
> invariably like this. I have normally got an experienced
supervisor or foreman
> to mark up the isos at checking stage for the FFWs. In the
contract documents
> you can always allow the fabricator/field installer to change
the FFWs if they
> are one and the same.
>
> Many contractors do not produce shop spool drawings these days
preferring to
> work directly from the isos. They may not even have a spooling
shop rather
> erecting a temporary area at site.
>
> I do not think this level of detail is a waste of time if you
use experienced
> resources to put on the information. Even if the field guy has a
different
> opinion to where FFWs go it does not mean they are right or any
smarter than the
> designer.
>
> "Paul Bowers" <pbowers@pipingdesign.com> on 08/06/2001 09:26:26
>
> Please respond to <a href="/group/PipingDesign/post?postID=kTCN8ugMflNAEcJ0DOdd-WU-eekJgxKAjjJuB9da1F6yfOdT7Acp36wny6wFLdDCcSdj2S---WKLdQi1GdHr1P9wq0ETIQ">PipingDesign@yahoogroups.com</a>
>
> To: <PipingDesign@yahoogroups.com>
> cc:
>
> Subject: [PipingDesign] Piping Erection
>
> Just wondering what the general consensus is on this, me not
being
> a fab guy.
>
> Should field weld and field-fit welds be indicated on the piping
> isometric (I'm not referring to spool sheets)?
>
> Since it is the piping fabricator who will be installing the
> system, aren't they in a better position to determine where to
> break up the line? I suspect that most effort put into
specifying
> FWs and FFWs is wasted.
Received on Thu Jun 07 22:29:00 2001
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