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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Archived Rulemaking: Transportation of Natural and Other Gas by Pipeline; Ovality of Field Bends in Steel Pipe

50-fr-13224.pdf (424.68 KB)

This amendment removes the ovality limitation requirement of 2/2 percent of the nominal diameter for a field bend made in steel pipe during construction of transmission lines and mains. This limitation was operational in origin (i.e., to permit the passage of internal "pigging" devices) and has been found to be redundant because of other performance requirements that each bend have a smooth contour, be free of mechanical damage, and must not impair the serviceability of the pipe. Experience has also shown that the rule was unnecessary for safety.

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Last updated: Friday, August 17, 2018