PHMSA Gas Transmission (GT) Integrity Management
Time: 04/20/2014 10:47 AM

Protocol Item F.04

F.04 Reassessment Intervals

Verify that the requirements for establishing the reassessment intervals are consistent with section 192.939 and ASME B31.8S-2004. [192.937(a), 192.939(a), 192.939(b), 192.913(c), and ASME B31.8S-2004, Section 5, Table 3]

  1. Verify that the operator reassesses covered segments on which a baseline assessment was conducted during the baseline period specified in subpart 192.921(d) by no later than seven years after the baseline assessment of that covered segment unless the reassessment evaluation (refer to Protocol F.01) indicates an earlier reassessment. [192.937(a)]

  1. For pipelines operating at or above 30% SMYS, verify that the operator meets the following requirements:
    1. If the operator establishes a reassessment interval greater than seven (7) years, a confirmatory direct assessment (refer to Protocol G) must be performed at intervals not to exceed seven (7) years followed by a reassessment at the interval established by the operator (refer below). [192.939(a)]
    2. Unless a deviation is permitted under 192.913(c), the maximum reassessment interval shall not exceed the values listed in the 192.939(b) table. [192.937(a)]
    3. If the reassessment method is a pressure test, ILI, or other equivalent technology, the interval must be based on either: (1) the identified threat(s) for the covered segment (see 192.917) and on the analyses of the results from the last integrity assessment, and a review of data integration and risk assessment; or (2) using the intervals specified for different stress levels of pipeline listed in ASME B31.8S-2004, Section 5, Table 3. An operator must use the test pressures specified in ASME B31.8S-2004, Section 5, Table 3, to justify an extended reassessment interval in accordance with 192.939. [192.939(a)(1)]
    4. If the reassessment method is external corrosion direct assessment, internal corrosion direct assessment, or SCC direct assessment refer to Protocol D for evaluating the operator's interval determination.
  1. For pipelines operating < 30% SMYS, verify that the operator selects one of the following reassessment approaches:
    1. Reassessment by pressure test, internal inspection or other equivalent technology following the requirements in 192.939(a)(1) except that the stress level referenced in 192.939(a)(1)(ii) would be adjusted to reflect the lower operating stress level. However, if an established interval is more than seven (7) years, the operator must conduct at seven (7) year intervals either a confirmatory direct assessment in accordance with 192.931, or a low stress reassessment in accordance with 192.941. An operator must use the test pressures specified in ASME B31.8S-2004, Section 5, Table 3, to justify an extended reassessment interval in accordance with 192.939.[192.939(b)(1)]
    2. Reassessment by external corrosion direct assessment, internal corrosion direct assessment, or SCC direct assessment. Refer to Protocol D for evaluating the operator's interval determination. [192.939(b)(2), 192.939(b)(3) and 192.939(b)(4)]
    3. Reassessment by confirmatory direct assessment at seven year intervals in accordance with subpart 192.931, with reassessment by one of the methods listed in 192.939(b)(1) 192.939(b)(3) by year 20 of the interval. [192.939(b)(4)]
    4. Reassessment by the "low stress method" at 7-year intervals in accordance with 192.941 with reassessment by one of the methods listed in 192.939(b)(1) through 192.939(b)(3) by year 20 of the interval. [192.939(b)(5)]
  1. Verify that a covered segment on which a prior assessment was credited as a baseline assessment under subpart 192.921(e) is required to be reassessed by no later than December 17, 2009. [192.937(a)]

  1. Verify that reassessment intervals are appropriate and that adequate documentation and technical bases support the intervals selected.

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