PHMSA Gas Transmission (GT) Integrity Management
Time: 05/23/2013 04:19 PM

Protocol Item E.02

E.02 Program Requirements for Identifying Anomalies

Inspect the operator's program to verify that provisions exist for the classification and remediation of anomalies that meet the criteria for: (1) Immediate repair conditions; (2) One-year conditions; (3) Monitored conditions; or (4) Other conditions as specified in ASME B31.8S-2004, Section 7 . [�192.933(c) and �192.933(d)]

  1. Verify the program requires a temporary pressure reduction or the pipeline to be shut down upon discovery of all immediate repair conditions. [�192.933(d)(1)]

  1. Verify provisions exist to classify and categorize anomalies meeting the following criteria:
    1. Immediate Repair Conditions (Conditions requiring immediate remediation actions)
      1. Calculated remaining strength indicates a failure pressure that is less than or equal to 1.1 times MAOP; [�192.933(d)(1)]
      2. A dent having any indication of metal loss, cracking, or a stress riser; [�192.933(d)(1)]
      3. An indication or anomaly that is judged by the person designated by the operator to evaluate assessment results as requiring immediate action. [�192.933(d)(1)]
      4. Metal-loss indications affecting a detected longitudinal seam if that seam was formed by direct current or low-frequency electric resistance welding or by electric flash welding; [ASME B31.8S-2004, Section 7.2.1]
      5. All indications of stress corrosion cracks; [ASME B31.8S-2004, Section 7.2.2]; or
      6. Any indications that might be expected to cause immediate or near-term leaks or ruptures based on their known or perceived effects on the strength of the pipeline. [ASME B31.8S-2004, Section 7.2.3]
    2. One-Year Conditions (Conditions requiring remediation within one year of discovery).
      1. A smooth dent located between the 8 and 4 o'clock positions (upper 2/3 of the pipe) with a depth greater than 6% of the pipeline diameter; [�192.933(d)(2)] or,
      2. A dent with a depth greater than 2% of the pipeline's diameter, that affects pipe curvature at a girth weld or at a longitudinal seam weld. [�192.933(d)(2)]
    3. Monitored Conditions (Conditions which must be monitored until the next assessment).
      1. A dent with a depth greater than 6% of the pipeline diameter located between the 4 and 8 o'clock position (lower 1/3) of the pipe; [�192.933(d)(3)]
      2. A dent located between the 8 and 4 o'clock position (upper 2/3) of the pipe with a depth greater than 6% of the pipeline diameter, and engineering analysis to demonstrate critical strain levels are not exceeded; [�192.933(d)(3)]or,
      3. A dent with a depth greater than 2% of the pipeline diameter, that affects pipe curvature at a girth weld or a longitudinal seam weld, and engineering analysis of the dent and girth or seam weld to demonstrate critical strain levels are not exceeded. [�192.933(d)(3)]
  1. Verify provisions exist to record and monitor anomalies that are classified as "monitored conditions" during subsequent risk or integrity assessments for any change in their status that would require remediation. [�192.933(d)(3)]

  1. Verify that program requirements exist to meet the provisions of ASME B31.8S-2004, Section 7, Figure 4 for scheduling and remediating any other threat conditions that do not meet the classification criteria of Protocol E.02.b, above. [�192.933(c)]

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