51312-01654-Applying Direct Assessment on Segments in a Station Environment

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Product Number: 51312-01654-SG

ISBN: 01654 2012 CP

Author: Adam Ray Gardner

Publication Date: 2012

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ABSTRACTDirect Assessment (DA) techniques are PHMSA approved methodologies for assessing the condition of buried pipelines. DA methods rely on a programmatic assessment approach based on fundamental engineering practices involving a four step process specific to each type of major corrosion threat (External Internal and Stress Corrosion Cracking).Since the implementation of the Pipeline Safety Act of 2002 and subsequent Integrity Management Regulations by the Department of Transportation difficult-to-assess pipeline segments such as cased segments and station piping have posed significant challenges to operators relying on External Corrosion Direct Assessment (ECDA) and Internal Corrosion Direct Assessment (ICDA) as integrity assessment methods.Terminal compressor fabricated gate and generating stations pose some significant challenges to the use of traditional Direct Assessment. The data collection and analysis process is typically much more challenging as stations can have multiple pipelines varying in design characteristics operating parameters and varying degrees of corrosion susceptibility throughout the facility. Drawings may not be accurate and data if documented is likely to be spread across multiple and disparate sources. Additionally traditional indirect inspection tools may have limited effectiveness and excavations can be complicated by unusual depth and multiple pipelines in the dig region.This paper discusses the evolution and application of advanced tools and methodologies implemented to assist in applying DA in a station environment.Keywords: ICDA Internal Corrosion Direct Assessment External Corrosion Direct Assessment ECDA