Re: spooling

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
Received on Wed Jun 22 21:06:00 2005