Bürger, Thomas
Figure 4: Measurement of conic objects
Piping components are positioned coaxially into the pipe. While this might not be exactly true in reality it is a rea-
sonable assumption for as-built-documentation. This assumption leads to an easy modelling procedure for pipes and its
components:
1. Measurement of the pipe (or a straight part of the pipe) as a cylindric object.
2. Measurement of points on flange-edges, center-points on handwheels etc.
3. Calculation of the component's geometry resulting from the point-positions and the pipe's centerline.
4. Coaxial insertion of the pipe-components at the given positions.
At this point not only position and shape of the components are known but also the pipe's topology which is an important
information for documentation of chemical processes.
Figure 5: As-built documented pipe segment with coaxially included piping components
Piping components of process plants are not designed individually but choosen from component-c
contain information about all components which may be used in one pipe of a given Specification which depends on the
chemical process. The relevant parameters for the component-choice are the bore size which is approximately the inner
diameter of the pipe and the pressure rate. Al geometrical parameters of tubes, flanges, valves and other components
depend on these parameters and can be found in the catalog-data.
atalogs. Catalogs
Using this catalog-data the feature-measurement for piping-components need only be enough accurate to obviously iden-
tify the component in the catalog and to replace optionally the measured data by catalog-data. The following table shows
examples from the german DIN-catalogs of tube-material (A) and flanges (B):
110 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.
Table
relativ
as flan
Using
specif
The m
older |
à Ui
The p
structi
comp:
it mig
mater
One a
straig|
Straig
The 1
orient
Resid
The s
leads
and a
Using
visibl
orien
1p,
