Frequently-Asked Question FAQ #135

FAQ-135: Considering Segments outside HCAs when Corrosion is Found

Question: Must I consider segments not in HCAs when evaluating my pipeline after discovering corrosion in a covered segment?

Answer: Yes. The rule requires that operators who identify corrosion in a covered segment that could adversely affect the integrity of the line must evaluate and remediate, as necessary, all pipeline segments (both covered and non-covered) with similar material coating and environmental characteristics (192.917(e)(5)). This section of the rule refers to conditions identified in section 192.933 as those requiring this evaluation and remediation. Those conditions represent severe corrosion -- instances in which the remaining strength of the pipe is less than or equal to 1.1 times MAOP. As a matter of prudence, OPS would expect operators to consider non-covered segments, as appropriate, when less severe corrosion is found (e.g., when a new corrosion threat has been identified), but such broader evaluations are not required by the rule.