Part 255 Transmission and Distribution of Gas

ECDA is a four-step process that combines preassessment, indirect inspection, direct examination, and post assessment to evaluate the threat of external corrosion to the integrity of a pipeline. An operator that uses direct assessment to assess the threat of external corrosion mu…

Internal corrosion direct assessment (ICDA) is a process an operator uses to identify areas along the pipeline where fluid or other electrolyte introduced during normal operation or by an upset condition may reside, and then focuses direct examination on the locations in covered …

Stress Corrosion Cracking Direct Assessment (SCCDA) is a process to assess a covered pipe segment for the presence of SCC primarily by systematically gathering and analyzing excavation data for pipe having similar operational characteristics and residing in a similar physical env…

An operator using the confirmatory direct assessment (CDA) method as allowed in section 255.937 of this Part must have a plan that meets the requirements of this section and of sections 255.925 (ECDA) and 255.927 of this Part (ICDA). An operator may only use CDA on a covered segm…

An operator must take prompt action to address all anomalous conditions that the operator discovers through the integrity assessment. In addressing all conditions, an operator must evaluate all anomalous conditions and remediate those that could reduce a pipeline's integrity. An …

An operator must take additional measures beyond those already required by this Part to prevent a pipeline failure and to mitigate the consequences of a pipeline failure in a high consequence area. An operator must base the additional measures on the threats the operator has iden…

After completing the baseline integrity assessment of a covered segment, an operator must continue to assess the line pipe of that segment at the intervals specified in section 255.939 of this Part and periodically evaluate the integrity of each covered pipeline segment as provid…

An operator must comply with the following requirements in establishing the reassessment interval for the operator's covered pipeline segments. An operator must establish a reassessment interval for each covered segment operating at or above 30 percent SMYS in accordance with the…

An operator of a transmission line that operates below 30 percent SMYS may use the following method to reassess a covered segment in accordance with section 255.939 of this Part. This method of reassessment addresses the threats of external and internal corrosion. The operator mu…

In the following limited instances, the department and OPS may allow a waiver from a reassessment interval required by section 255.939 of this Part if the department and OPS find a waiver would not be inconsistent with pipeline safety. (1) Lack of internal inspection tools. An op…

An operator must include in its integrity management program methods to measure whether the program is effective in assessing and evaluating the integrity of each covered pipeline segment and in protecting the high consequence areas. These measures must include the four overall p…

An operator must maintain, for the useful life of the pipeline, records that demonstrate compliance with the requirements of sections 255.901 through 255.951 of this Part. At minimum, an operator must maintain the following records for review during an inspection: (a) a written i…

An operator must submit any notification required by sections 255.901 through 255.951 of this Part. Such notification must also be submitted to the U.S. Department of Transportation in accordance with 49 CFR section 192.949.

An operator must submit any report required by sections 255.901 through 255.951 of this Part to the department. Such reports must also be submitted to the U.S. Department of Transportation in accordance with 49 CFR section 192.951.

(a) Riser designs must be tested to ensure safe performance under anticipated external and internal loads acting on the assembly. (b) Factory assembled anodeless risers must be designed and tested in accordance with ASTM F1973 (as described in section 10.3 of this Title). (c) All…