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Welcome The largest threat to cased pipeline crossings is external corrosion. The PIMS: Cased Crossing one-day seminar will discuss using External Corrosion Direct Assessment (ECDA) integrity evaluation methods and other technologies to assess pipe casings in HCAs as set forth in NACE Standard SP0502 and in the PHMSA Guidelines for Integrity Assessment of Cased Pipe for Gas Transmission Pipelines in HCAs. Presentations will focus on important considerations an operator must address in its integrity management plan and acceptable procedures for conducting ECDA on cased pipe. Join us November 11th in Golden, Colorado, for the next PIMS: Cased Crossing Seminar!
Friday, November 11, 2011
Background
Under the 2002 Pipeline Safety and Improvement Act, all gas transmission pipelines located in High Consequence Areas (HCAs) must have an integrity management program (IMP). One aspect of an integrity management program specifically mandated by Congress is that each gas transmission pipeline located in an HCA must have an integrity assessment by an approved method no later than December 17, 2012, and must be periodically reassessed at least every seven years thereafter. Cased pipeline crossings pose particular challenges, not only because both the casing and the carrier pipes within the casings are vulnerable to corrosion, but because assessments are hampered by the difficulty and high cost of accessing these pipelines compared to those that are not cased. Currently In-Line Inspection (ILI), Pressure Testing, and Direct Assessment (DA) provide the only approved assessment tools to the pipeline industry for assessing the threats of external and internal corrosion and stress corrosion cracking (SCC). Each operator must determine which method(s) are applicable to their situation. However, the assessment of cased pipe continues to prove challenging to operators if ILI and pressure testing are impractical or not possible as assessment options. This has necessitated the development of DA methods using ECDA to assess cased pipe. Integrity assessments must be conducted in accordance with 49 CFR 192 Subpart O for gas pipelines and 49 CFR 195 Subpart H for hazardous liquid pipelines, which state that ECDA must be performed in accordance with NACE Standard SP0502.
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