PHMSA Gas Transmission (GT) Integrity Management
Time: 12/21/2014 04:00 AM

Protocol Item G.01

G.01 Confirmatory Direct Assessment, CDA

If using confirmatory direct assessment (CDA) as allowed in 192.937, verify that the operator's integrity management plan meets the requirements of 192.931, 192.925 (ECDA) and 192.927 (ICDA). [192.931]

  1. Verify that the operator's CDA plan for external corrosion complies with all of the requirements contained in 192.925 (See Protocol D.01 ~ Protocol D.05) with the following exceptions, [192.931(b) and 192.925]
    1. The procedures for indirect examination may allow use of only one indirect examination tool suitable for the application
    2. The procedures for direct examination and remediation must provide that all immediate action indications and at least one scheduled action indication are excavated for each ECDA region.
  1. Verify that the operator's CDA plan for internal corrosion complies with all of the requirements contained in 192.927 (See Protocols D.6 ~ D.9) except that procedures for identifying locations for excavation may require excavation of only one high risk location in each ICDA region.[192.931(c) and 192.925]

  1. When using CDA carried out under 192.931(b) or (c), if an operator discovers any defect requiring remediation prior to the next scheduled assessment, verify that the operator evaluates the need to accelerate the schedule for the next assessment. If the schedule is accelerated, verify that the new assessment scheduled is determined using the methodology documented in NACE RP0502-2002, Section 6.2 and NACE RP0502-2002, Section 6.3. [192.931(d)]
    1. If the defect requires immediate remediation, verify the operator reduces pressure consistent with 192.933 (See Protocol E) until the operator has completed reassessment using one of the assessment techniques allowed in 192.937 (See Protocol F). [192.931(d)]

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