What Are the Required Reassessment Intervals? [49 CFR 192.939]

Current as of source date Government source

Louisiana Office of ConservationOfficial agency material

(A)A. An operator must comply with the following requirements in establishing the reassessment interval for the operator's covered pipeline segments. [49 CFR 192.939]#

(1)1. Pipelines operating at or above 30 percent SMYS. An operator must establish a reassessment interval for each covered segment operating at or above 30 percent SMYS in accordance with the requirements of this Section. The maximum reassessment interval by an allowable reassessment method is 7 calendar years. Operators may request a 6-month extension of the seven-calendar- year reassessment interval if the operator submits written notice to OPS, in accordance with §518, with sufficient justification of the need for the extension. If an operator establishes a reassessment interval that is greater than seven calendar years, the operator must, within the seven-calendar-year period, conduct a confirmatory direct assessment on the covered segment, and then conduct the follow-up reassessment at the interval the operator has established. A reassessment carried out using confirmatory direct assessment must be done in accordance with §3331. The table that follows this Section sets forth the maximum allowed reassessment intervals. [49 CFR 192.939(a)]#

(a)a. Pressure Test or Internal Inspection or Other Equivalent Technology. An operator that uses pressure testing or internal inspection as an assessment method must establish the reassessment interval for a covered pipeline segment by: [49 CFR 192.939(a)(1)]#

(i)i. basing the interval on the identified threats for the covered segment (see §3317) and on the analysis of the results from the last integrity assessment and from the data integration and risk assessment required by §3317; or [49 CFR 192.939(a)(1)(i)]#

(ii)ii. using the intervals specified for different stress levels of pipeline (operating at or above 30 percent SMYS) listed in ASME B31.8S (incorporated by reference, see §507), Section 5, Table 3. [49 CFR 192.939(a)(1)(ii)]#

(b)b. External Corrosion Direct Assessment. An operator that uses ECDA that meets the requirements of this Chapter must determine the reassessment interval according to the requirements in paragraphs 6.2 and 6.3 of NACE SP0502 (incorporated by reference, see §507) [49 CFR 192.939(a)(2)] .#

(c)c. Internal Corrosion or SCC Direct Assessment. An operator that uses ICDA or SCCDA in accordance with the requirements of this Chapter must determine the reassessment interval according to the following method. However, the reassessment interval cannot exceed those specified for direct assessment in ASME/ANSI B31.8S, Section 5, Table 3: [49 CFR 192.939(a)(3)]#

(i)i. determine the largest defect most likely to remain in the covered segment and the corrosion rate appropriate for the pipe, soil and protection conditions; [49 CFR 192.939(a)(3)(i)]#

(ii)ii. use the largest remaining defect as the size of the largest defect discovered in the SCC or ICDA segment; and [49 CFR 192.939(a)(3)(ii)]#

(iii)iii. estimate the reassessment interval as half the time required for the largest defect to grow to a critical size. [49 CFR 192.939(a)(3)(iii)]#

(2)2. Pipelines operating below 30 percent SMYS. An operator must establish a reassessment interval for each covered segment operating below 30 percent SMYS in accordance with the requirements of this Section. The maximum reassessment interval by an allowable reassessment method is seven calendar years. Operators may request a 6-month extension of the 7-calendar-year reassessment interval if the operator submits written notice to OPS in accordance with §518. The notice must include sufficient justification of the need for the extension. An operator must establish reassessment by at least one of the following: [49 CFR 192.939(b)]#

(a)a. reassessment by pressure test, internal inspection or other equivalent technology following the requirements in Paragraph A.1 of this Section except that the stress level referenced in Subparagraph A.1.b of this Section would be adjusted to reflect the lower operating stress level. If an established interval is more than seven calendar years, an operator must conduct by the seventh calendar year of the interval either a confirmatory direct assessment in accordance with §3331, or a low stress reassessment in accordance with §3341; [49 CFR 192.939(b)(1)]#

(b)b. reassessment by ECDA following the requirements in Subparagraph 1.b of this Section; [49 CFR 192.939(b)(2)]#

(c)c. reassessment by ICDA or SCCDA following the requirements in Subparagraph 1.c of this Section; [49 CFR 192.939(b)(3)]#

(d)d. reassessment by confirmatory direct assessment at 7-year intervals in accordance with §3331, with reassessment by one of the methods listed in Subparagraphs A.2.a-c of this Section by year 20 of the interval; [49 CFR 192.939(b)(4)]#

(e)e. reassessment by the low stress assessment method at 7-year intervals in accordance with §3341 with reassessment by one of the methods listed in Paragraphs B.1 through B.3 of this Section by year 20 of the interval [49 CFR 192.939(b)(5)] .#

(f)f. the following table sets forth the maximum reassessment intervals. Also refer to §5109, Appendix E.II for guidance on Assessment Methods and Assessment Schedule for Transmission Pipelines Operating Below 30 percent SMYS. In case of conflict between the rule and the guidance in the Appendix, the requirements of the rule control. An operator must comply with the following requirements in establishing a reassessment interval for a covered segment [49 CFR 192.939(b)(6)] .#

Maximum Reassessment Interval#

Assessment Method#

Pipeline operating at or above 50% SMYS#

Pipeline operating at or above 30% SMYS, up to 50% SMYS#

Pipeline operating below 30% SMYS#

Internal Inspection Tool, Pressure Test or Direct Assessment#

10 years#

(*)#

15 years#

(*)#

20 years#

(**)#

Confirmatory Direct Assessment#

7 years#

Low stress reassessment#

not applicable#

7 years + ongoing actions specified in §3341.#

(*)A confirmatory direct assessment as described in §3331 must be conducted by year 7 in a 10-year interval and years 7 and 14 of a 15-year interval.#

(**)A low stress reassessment or confirmatory direct assessment must be conducted by years 7 and 14 of the interval.#

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:501 et seq.#

HISTORICAL NOTE: Promulgated by the Department of Natural Resources, Office of Conservation, Pipeline Division, LR 30:1283 (June 2004), amended LR 31:688 (March 2005), LR 33:486 (March 2007), LR 38:122 (January 2012), LR 44:1044 (June 2018), LR 46:1601 (November 2020).#