USE OF SURVIVAL MODELING METHODS WITH PIPELINE INSPECTION DATA FOR DETERMINING CAUSAL FACTORS FOR CORROSION UNDER INSULATION
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United States of America Patent
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Issued Date -
Nov 14, 2013
app pub date -
May 9, 2012
filing date -
May 9, 2012
priority date (Note) -
Abandoned
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Abstract
Methods and systems for using survival modeling methods with pipeline inspection data to determine causal factors for corrosion under insulation comprise determining a first corrosion condition of a pipeline joint at a first time; determining a second corrosion condition of the pipeline joint at a second, subsequent time; determining joint attributes, pipeline attributes, and location attributes associated with the pipeline joint; and repeating the process for a plurality of pipeline joints in one or more pipelines. This information is fed into a multiple regression and survival analysis process that determines regression coefficients reflecting the estimated degrees to which various factors contribute to corrosion under insulation. The survival analysis also determines one or more survival models capable of predicting when a given pipeline joint is likely to transition from a first corrosion state to a different second corrosion state, given values for its various attributes.
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