Category: Digital Twins
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Why can’t I use odometry for ILI runcoms?
(15-minute read) Odometry is understood to be useful for sorting inspection features, but it is useless for comparing them. There is too much disagreement. This article presents an alternative to the common “wheel slip” explanation. It describes odometry errors as an unavoidable consequence of bias introduced during navigation by dead reckoning.
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Vocabulary for pipeline inspection matching (runcoms)
(5 Min Read – Industry) I am a data analyst. I have not seen a set of terminology that is from this perspective. These are the terms I use. Help me improve this? What is confusing?
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Calculating small distances between lat/long coordinates using Excel
*(Technical)* The most common GCS distance calculation, the Spherical Law of Cosines (SLoC), gives poor results at short distances. This is an issue when calculating joint lengths using latitude/ longitude pairs. At these short distances, the spherical law of cosines has a precision of only 4.5%. In contrast, the three alternate techniques I compare with…
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Combining sensing modalities
*(Technical)* Suppose you have had multiple sensors traverse a section of pipe with the intent of detecting axial cracking. Rather than concern ourselves with which tool does the “best” at detecting the phenomenon, we can treat the signal from each inspection as a piece of evidence supporting or refuting the hypothesis that axial cracking is…
acK for pipeline integrity 