Page 372 - Pipeline Pigging Technology

High-accuracy calliper surveys

K = (r p r^) xlOO
where K = curvature,
r p = pipe radius, and
r g = measured radius of centre line.

Display functions

The screen

The display screen for Geodent has the following basic framework:

a main menu bar across the top of the screen, with pull-down menus
selectable by the mouse, arrow keys or keyboard letters;
a main display on the screen, where the pipeline data is displayed in a
selectable format;
a detail display on the screen, where a zoom of the main section is
displayed in a selectable format;
information panels on the left of both the main and detail displays,
where either the colour spectrum or information about the dent or
feature is displayed;
data panel at the bottom of the screen, where six lines of information
are displayed concerning the program status or data requested.

Types of display

This section describes the graphic display types that are available on
menus on the main display bar under Display. Each display will show the
options available for that menu.
Thermal: depicts a section of the pipeline in a selectable colour scheme.
Each calliper sonar reading in the window area is colour plotted as a function
of its residual value from a circle on each scan line and for the display width.
Cross section: plots all sonar ring readings within a section of the pipeline
at a distance or time along the pipeline (scan line). Each sonar reading is
plotted relative to a theoretical vertical line that would represent a circle. The
plotted deviations from this line represent the magnitude of the dent, ovality
or other feature.
Profile section: plots the readings from each of the calliper sonars within
a section of pipeline as it transits the pipeline. Each sonar reading is plotted

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