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How Many Excavations are Required to Confirm the Absence of SCC on a Pipeline Following SCCDA

Picture for How Many Excavations are Required to Confirm the Absence of SCC on a Pipeline Following SCCDA
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This paper examines the relationship between stress corrosion cracking (SCC) threat modeling and the number of digs required to conclude that a pipeline is SCC free. Results show that when a reliable inspection prioritization model is used, few digs are required to infer that a pipe has a low probability of SCC.

 

Product Number: 51317--9346-SG
ISBN: 9346 2017 CP
Author: Francois Ayello
Publication Date: 2017
Industry: Pipelines, Tanks, and Underground Systems
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$20.00
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How many excavations are required to confirm the absence of SCCon a pipeline following the SCCDA process?NACE’s Stress Corrosion Cracking Direct Assessment (SCCDA) is used by pipeline operators to infer the presence or absence of stress corrosion cracking (SCC) on a pipeline. Results from direct examinations of the pipeline are easy to interpret when SCC is found. It is more complicated when SCC is not found how many digs are required to show that a pipeline is free from SCC? This paper examines the relationship between SCC modeling and the number of digs required to show that a pipeline is SCC free. Results show that when a reliable inspection prioritization model is used few digs are required to infer that a pipe has a low probability of SCC. On the other hand when a non-reliable SCC model is used the number of direct inspection required is high. Consequently the cost of the SCCDA process is directly linked to the quality of the SCC model used to choose direct inspection locations.

Key words: Bayes theorem, Excavation, SCC, SCCDA, Stress Corrosion Cracking

 

How many excavations are required to confirm the absence of SCCon a pipeline following the SCCDA process?NACE’s Stress Corrosion Cracking Direct Assessment (SCCDA) is used by pipeline operators to infer the presence or absence of stress corrosion cracking (SCC) on a pipeline. Results from direct examinations of the pipeline are easy to interpret when SCC is found. It is more complicated when SCC is not found how many digs are required to show that a pipeline is free from SCC? This paper examines the relationship between SCC modeling and the number of digs required to show that a pipeline is SCC free. Results show that when a reliable inspection prioritization model is used few digs are required to infer that a pipe has a low probability of SCC. On the other hand when a non-reliable SCC model is used the number of direct inspection required is high. Consequently the cost of the SCCDA process is directly linked to the quality of the SCC model used to choose direct inspection locations.

Key words: Bayes theorem, Excavation, SCC, SCCDA, Stress Corrosion Cracking

 

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