Re: Flange Bolt Hole Straddling Centerlines

Most FLUPS are made from a piece of shaft that has been turned down to fit tightly in the bolt hole of a flange. Most are turned down with a series of steps so they will work an a wide range of bolt hole sizes. There are some other designs on the market but I usually buy the simple bars as I don't get nearly as angry when they get lost and they are virtually indestructible.
Take a look at www.mathhey.com (they make pipe fitting tools) or I could post a couple of pics if any one is that interested. On Sunday, June 24, 2001, at 01:26 AM, Paul Bowers wrote:

> My understanding was that as long as the NS-EW-UpDown straddling
> rule was observed, it would be impossible to misalign a flanged
> joint. Then again, I'm a theorist, not a fitter.
>
> We all likely have much to learn from actual field practices, and
> this list is not just for engineering-type geeks. It's really for
> people who want to get insider information about piping design,
> fabrication and installation.
>
> Good question, since most of us "designers" have little clue about
> how things are actually done.
>
> Paul
>
>
>
> > >The dowels are called among other things FLUPS or Flange Line
> Up Pins.
> > >It does sound like the best answer, and it provides a standard
> that way
> > >spools can be built away from where they are to be installed
> and
> > >provided the other guy leveled the holes every thing lines
> right up.
> > >At least that's how I see it.
>
> > I have this odd feeling that I'm missing something. Why install
> dowels
> > instead of lining up using the bolt holes that are already
> there? Seems
> > like you could put a couple of bolts in the two top holes of the
> fixed
> > flange and line up on them. If the 1/16 clearance is too sloppy
> find
> > something like pipe or round bar and turn it to a slip fit and
> use that
> > instead of the dowels. The object of the whole exercise is to
> get the
> > bolt holes to match, anyway. Is there something else that the
> dowels are
> > needed for?
>
>
>

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>
>
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[Non-text portions of this message have been removed] Received on Fri Jun 29 00:09:00 2001