PHMSA Gas Transmission (GT) Integrity Management
Time: 09/20/2014 03:53 AM

Protocol Item D.05

D.05 ECDA Post-Assessment

Verify that the ECDA Post assessment process complies with ASME B31.8S-2004, Section 6.4 and NACE RP0502-2002, Section 6, to (1) define reassessment intervals and (2) assess the overall effectiveness of the ECDA process. [192.925(b)(4) and 192.939]

  1. Verify that the operator determined reassessment intervals in accordance with NACE RP0502-2002, Section 6.
    1. Verify the adequacy of the operators remaining life calculations. [NACE RP0502-2002, Section 6.2]
    2. Verify that the maximum re-assessment intervals for each region are one half the calculated remaining life. [NACE RP0502-2002, Section 6.1.3 and NACE RP0502-2002, Section 6.3]
  1. Verify that the reassessment intervals are adjusted if required in accordance with special provisions in Subpart O, as follows:
    1. Verify that reassessment intervals do not exceed the maximum intervals (refer to Protocol F) established in 192.939, as follows:
        1. 10 years for pipeline segments operating at SMYS levels greater than 50%
        2. 15 years for those segments operating between 30 and 50% SMYS
        3. 20 years for those segments operating below 30% SMYS
    2. Verify that the operator specifies and applies criteria for evaluating whether conditions discovered by direct examination of indications in each ECDA region indicate a need for reassessment of the covered segment at an interval less than that specified in 192.939. [192.925(b)(4)(ii)]
  1. Verify that performance measures for ECDA effectiveness have been defined and are monitored. [192.925, 192.945(b) and NACE RP0502-2002, Section 6]
    1. Verify that at least one additional, randomly selected anomaly location has been excavated for process validation. [NACE RP0502-2002, Section 6.4.2]
    2. Verify that additional criteria have been established and monitored to evaluate long-term program effectiveness such as those identified in NACE RP0502-2002, Section 6.4.3. [192.945(b) and NACE RP0502-2002, Section 6.4.3]
  1. Verify the operator's process has incorporated feedback at all appropriate opportunities throughout the ECDA process to demonstrate feedback and continuous improvement. [192.907(a) and NACE RP0502-2002, Section 6.5]

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