February 15, 2024: Integrity Assessment of Carrier Pipes Inside Cased Crossings

  • Author: Joe Pikas
  • Level: Advanced
  • Study time: 4 hours
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Course overview
What is cased crossing?  How do we assess the integrity inside carrier pipes?

This course will cover the mandated integrity assessments on the electrical isolation of pipelines from other structures as required by the PHMSA. This includes casings, isolating devices, AC transmission lines, etc. Underground pipelines must be electrically isolated from other underground metallic casings unless the pipeline and the other structure. Inspection and electrical tests must be made to assure that electrical isolation is adequate to meet TVC requirements.

PDH Certificate included upon successful completion

  • Course Outline

    Introduction to Cased & Uncased Crossings
    Understanding Road and RR Crossing Design
    • Uncased
    • Cased
    • Temporary
  • Cased Crossing Monitoring
    • Indirect Tools for Cased Pipe
    • Pressure
    • DA
    • Other (GWT)
    • ILI
    • DA Regions
    • Above Ground Surveys
    • Mitigation
    • Casing Quality and Monitoring Guidelines
  • Assessment of Cased Crossings
    • Introduction
    • Corrosion and Causes
    • Coatings
    • Shielding
    • Metallic Contacts
    • Criteria for Casings
    • Assessment Tools (Un-piggable)
    • Electrical Tests
    • Other Technologies
    •       Guided Wave Testing (GWT)
    •       PIMS
    •       Coupons, Sensors & Probes
    • Verification and Prove Up
    • Maintenance
    • Conclusions
    • Procedure preparation
    • Casing Risk Ranking and associated inspection plans
    • Casing inspection
  • Statistical/Risk Analysis of External Corrosion ILI Data of Cased Crossings
    • Conduct statistical analyses of ILI data to assess corrosion threats of carrier pipes in casings
    • Distribution of peak anomalies vs. distance from casing ends
    • Distribution of anomaly depths and lengths
    • Distribution of PF/MAOP (factor of safety)
    • Percent of corroded carrier pipelines among all casings (%)
    • Effect of short on external corrosion
    • Conduct analyses of historical incidents in casings and safety of cased segments
    • Likelihood of Corrosion (PoF or CoF)

Joe Pikas

AMPP Corrosion Specialist & PL SME
Joe Pikas is a subject matter expert for Technical Toolboxes with more than 50 years of experience in pipeline construction, operations, corrosion control design, and implementation, including pipeline engineering management. He is an expert in pipeline integrity management, risk management, coating materials selection, cathodic protection design, and testing, and internal and external pipeline corrosion control. In 2009, he was awarded the NACE Distinguished Service Award and received an industry award in 2002 from AGA, GTI, INGAA, NACE, OPS, and PRCI International. Also, he has contributed over 50 papers to industry trade magazines, NACE, SSPC, and other publications and conferences.