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RE: taping plumb-bob?

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For a few pipes and ducts, you drop a plumb bob, mark the floor, measure the
height above the floor with a steel tape, and measure the distance from the
column grids.  (low tech)

For a lot of pipes and ducts, I would bring a surveyor in using Total
Station (high tech).  They can lay out a very complicated pipe and duct
system in 3D in an afternoon.  The Total Station initial set up costs a lot
so the cost per hour is relatively high, but once the data is collected it
can be overlaid on a CAD drawing in a very short amount of time.  Your total
time is much less than the low tech solution.

Call your local surveyors, ask them if they have Total Station capabilities.

Harold Sprague

> -----Original Message-----
> From:	Ken Peoples [SMTP:lvtakp(--nospam--at)]
> Sent:	Thursday, June 29, 2000 8:20 AM
> To:	seaint(--nospam--at)
> Subject:	taping plumb-bob?
> We have a need to measure (field locate) a lot of
> piping and ducts that are hung from the roof of an
> industrial building.  I don't need to be terribly
> accurate - just to within an inch or so.  In
> considering how to do this, I thought that it would be
> nice to be able to drop a plumb-bob (no matter now I
> write that I don't think the spelling is correct) down
> from a lift and be able to measure the vertical
> distance to the floor (actually from the plumb bob
> string?) without having to use a flimsy tape.  Has
> anyone seen something like I am describing?  I guess
> it could be digital.  I could use a cloth tape and
> attach a plumb-bob to it somehow but that doesn't
> appeal to me as much as having something that is
> actually made for the situation.  Any ideas? (using a
> survey instrument is not really feasible where this is
> located because of a lot of fork truck traffic)
> Thanks for your thoughts,
> Ken Peoples, P.E.
> lvta(--nospam--at)
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