PHMSA-2005-21305; Pipeline Safety: Polyamide-11 (PA-11) Plastic Pipe Design Pressures; Final Rule; Effective Date 1/23/09.

SUMMARY: This final rule amends the design factor and design pressure limits for natural gas pipelines made from new Polyamide-11 (PA-11) thermoplastic pipe. Together, these two changes in the regulations allow pipeline operators to operate certain pipelines constructed of new PA-11 pipe at higher operating pressures than is currently allowed for other plastic pipe materials.

EFFECTIVE DATE: January 23, 2009.

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