PHMSA Gas Transmission (GT) Integrity Management
Time: 08/29/2014 02:18 PM

Protocol Item C.01

C.01 Threat Identification

Verify that the operator identifies and evaluates all potential threats to each covered pipeline segment. [192.917(a)]

  1. If the operator is following the prescriptive or performance-related approaches, verify that the following categories of failure have been considered and evaluated: [192.917(a) and ASME B31.8S-2004, Section 2.2]
    1. external corrosion,
    2. internal corrosion,
    3. stress corrosion cracking;
    4. manufacturing-related defects, including the use of low frequency electric resistance welded (ERW) pipe, lap welded pipe, flash welded pipe, or other pipe potentially susceptible to manufacturing defects [192.917(e)(4) and ASME B31.8S-2004, Appendix A4.3];
    5. welding- or fabrication-related defects,
    6. equipment failures;
    7. third party/mechanical damage [192.917(e)(1)],
    8. incorrect operations (including human error),
    9. weather-related and outside force damage,
    10. cyclic fatigue or other loading condition [192.917(e)(2)],
    11. all other potential threats.
  1. If the operator is following the performance-based approach, verify that all 21 of the threats associated with the first nine failure categories listed above have been considered. [192.917(a) and ASME B31.8S-2004, Section 2.2]

  1. Verify that the operator's threat identification has considered interactive threats from different categories (e.g., manufacturing defects activated by pressure cycling, corrosion accelerated by third party or outside force damage) [ASME B31.8S-2004, Section 2.2].

  1. Verify that the approach incorporates appropriate criteria for eliminating a specific threat for a particular pipeline segment. [ASME B31.8S-2004, Section 5.10]

  1. Verify that the approach appropriately considers industry data and experience.

  1. Verify that the records indicate that all potential threats to each covered pipeline segment have been identified and evaluated.

    Adequate records that demonstrate all potential threats to each covered segment have been identified and evaluated should:

    1. Show consideration and evaluation of categories of threats summarized in 192.917(a), 192.917(e), and ASME B31.8S-2004.
    2. If performance-based approach is utilized, show that all 21 of the threats associated with 192.917(a) and ASME B31.8S-2004 are considered.
    3. Show interactive threats from different categories (e.g., manufacturing defects activated by pressure cycling, corrosion accelerated by third party or outside force damage) are considered.
    4. Show appropriate criteria for eliminating a specific threat for a particular pipeline segment.
    5. Show that industry data and experience was appropriately considered in the identification of potential threats.

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