Action
Grant of waiver.
Summary
PHMSA is granting Maritimes & Northeast Pipeline, L.L.C. (M&N) a waiver of compliance from certain PHMSA regulations for the United States portion of its pipeline system. This waiver increases the maximum allowable operating pressure (MAOP) for the pipeline. This waiver decision also authorizes M&N to increase the design factor for its compressor station piping, grants relief from the strength testing requirements for M&N's compressor station piping, grants relief in establishing the MAOP of pipelines operating above prescribed hoop stresses, grants relief from the capacity requirements of pressure limiting stations, and authorizes M&N to maintain the pressure rating of portions of the waiver area subject to a change in class location. Before granting the waiver, PHMSA performed a thorough technical review of M&N's application and supporting documents. PHMSA requested and received supplementary information on numerous technical aspects of M&N's design, engineering, operations, and maintenance practices. The materials are available in docket PHMSA-2006-23448 at http:// dms.dot.gov. PHMSA also sought comments from the public and received positive feedback from States along the pipeline and the Technical Pipeline Safety Standards Committee. The waiver is subject to and conditional upon supplemental safety criteria set forth in this notice. The supplemental safety criteria address the life-cycle management of the subject pipeline and require M&N to adhere to maintenance, inspection, monitoring, control, and reporting standards exceeding existing regulatory requirements.