Page 369 - Pipeline Pigging Technology

Pipeline Pigging Technology

dancy to compute the best velocity possible for use as input observations for
the Kalman filter. The along-track velocity is computed by using the recorded
times of the reflectors passing by the proximity sensor. The measured
circumference of the wheel over time interval yields the velocity for each
wheel. Opposing wheels are averaged to compute the centre line chainage
and velocity of the pig.

DATA PRESENTATION: THE GEODENT
SOFTWARE

Description

The Geodent program is designed to assist in analyzing the status of the
inside of an oil or gas pipeline using the data collected from the Pigco Pipeline
Services Ltd Geoptg. The data is collected and processed at intervals along and
around the pipeline for its entire length; included are the coordinates in
Northing and Easting, chainage, the elevation, the inside diameter, the ovality,
and the weld to weld distances. By examining this data in detail using the
powerful graphics in Geodent, anomalies can be identified and analyzed to
quantify the size, shape and location of dents, buckles, and so on.
The major features of the Geodent program that enhance its use are:
analysis is conducted on a standard PC-compatible computer using
menu-driven displays that minimize the learning curve to efficiently
and effectively analyze the pipeline condition;
all features and anomalies are located with accurate coordinates and
chainages for field location and correlation to the as-built drawings;
the Scan feature grades all features for the entire length of the pipeline,
prioritizing the analysis and allowing quick access to problem areas;
multiple windows facilitate viewing of a potential anomaly in many
different perspectives, scales and colours, including three-dimen-
sional, contour or section;
interactive measurements yield rapid determination of the size, shape
and extent of any anomaly;
computer-generated reports provide automatic grading of dents, listing
of pertinent details, and incorporating engineering comments;
the program can be interfaced with over 200 printers and plotters for
presentation and analysis.

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