Re: spooling

I agree with Barbara comment. She covered the important bases in pipe spooling without relying on S/w. Except for some of the terms green ends and cold pulls (is this also referred to as Cold spring?) this would answer the spooling question. Software generated spooling will be limited by the set up parameters but not the common sense of an experienced piper.

Regards,

• In PipingDesign@yahoogroups.com, Paul Bowers <pbowers@p...> wrote:
  > What a silly post, Barbara. Computers do all this stuff
  automagically
  > and isos generated by 3D modeling software are terrific!
  >
  > Oh, wait.
  >
  > The thing that annoys me most about auto-extracted isos is that
  they
  > often need to be cleaned-up by a human being in order to be
  legible. But
  > manually "cleaning them up" results in a hand-modified document
  which is
  > incompatible with a CAD-only environment (and if the iso is
  extracted
  > again from the model due to a model revision, it will be as
  visually
  > incomprehensible as before). 3D modelers can take shortcuts, fail
  to
  > ensure connectivity, not keep fabrication/iso breaks in mind while
  > modeling, etc., which will sometimes cause iso fun downstream.
  Can't
  > really blame the modelers, as it's very difficult to be detail
  perfect
  > when doing general routing tasks.
  >
  > I'd never heard the 'term green' end before, just 'field fit
  welds', but
  > that's a pretty good description.
  >
  > Paul
  >
  >
  > James, Barbara wrote:
  >
  > > Better Solution: Learn how to do it by hand!
  > >
  > > The idea of spooling is to identify sub-assemblies to be
  constructed in
  > > a works remote from site and transported to site for final
  assembly.
  > >
  > > First identify constraints on spool sizes:
  > > A) Physical limitation of transport - length * breadth * height
  > > B) Physical limitation of site access - likely to be tighter than
  > > transport limits.
  > > C) Weight limits - check SWL of cranes, forklifts and manual
  handling
  > > requirements at site and at the works.
  > > D) Access difficulties at site, don't specify a field weld in a
  location
  > > with no access.
  > >
  > > Identify locations for green ends (field fit tolerances)
  typically 100mm
  > > to 150mm, but check your company's procedures or Client Spec.
  You will
  > > need to have at least one green end in each of the orthogonal
  > > directions, maybe more if you have long runs or many changes of
  > > direction.
  > >
  > > If you have cold pulls or cold pushes in the system, the
  locations of
  > > these will be field welds, but not green ends, they need to be
  fully
  > > prepped so that you can ensure that the cold pull is applied
  accurately.
  > >
  > > Start at a logical place on your iso, eg equipment nozzle and
  work along
  > > the pipework, taking care of the physical constraints and making
  sure
  > > that cold pulls and free issue items are marked as field welds.
  > >
  > > I think that covers it, though I expect there will be comments
  from NZ
  > > and the US!
  > >
  > > Barbara