PHMSA Gas Integrity Management
Time: 11/23/2009 10:02 PM

Frequently-Asked Question FAQ #163

FAQ-163: HCA length varies with distance of ID site from pipeline

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Question: Why does the length of an HCA segment vary depending on how close to the pipeline an identified site is located? If an identified site is close to the pipeline the HCA length is longer than if an identified site is further away. Shouldn’t the HCA be the same?

Answer: The effects of pipeline incidents are proportional to distance from the pipeline. When an identified site is close to the pipeline, more of the pipeline length is within the radius of potential effects.

These Frequently Asked Questions (FAQs) are intended to clarify, explain, and promote better understanding of the pipeline integrity management rules. These FAQs are not substantive rules and do not create rights, assign duties, or impose new obligations not outlined in the existing integrity management regulations and standards. Requests for informal interpretations regarding the applicability of one or more of the pipeline integrity management rules to a specific situation may be submitted to PHMSA in accordance with 49 C.F.R. § 190.11.
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