49 CFR §192.111

1. (a)Except as otherwise provided in paragraphs (b), (c), and (d) of this section, the design factor to be used in the design formula in § 192.105 is determined in accordance with the following table:
2. (b)A design factor of 0.60 or less must be used in the design formula in § 192.105 for steel pipe in Class 1 locations that:
   1. (1)Crosses the right-of-way of an unimproved public road, without a casing;
   2. (2)Crosses without a casing, or makes a parallel encroachment on, the right-of-way of either a hard surfaced road, a highway, a public street, or a railroad;
   3. (3)Is supported by a vehicular, pedestrian, railroad, or pipeline bridge; or
   4. (4)Is used in a fabricated assembly, (including separators, mainline valve assemblies, cross-connections, and river crossing headers) or is used within five pipe diameters in any direction from the last fitting of a fabricated assembly, other than a transition piece or an elbow used in place of a pipe bend which is not associated with a fabricated assembly.
3. (c)For Class 2 locations, a design factor of 0.50, or less, must be used in the design formula in § 192.105 for uncased steel pipe that crosses the right-of-way of a hard surfaced road, a highway, a public street, or a railroad.
4. (d)For Class 1 and Class 2 locations, a design factor of 0.50, or less, must be used in the design formula in § 192.105 for—
   1. (1)Steel pipe in a compressor station, regulating station, or measuring station; and
   2. (2)Steel pipe, including a pipe riser, on a platform located offshore or in inland navigable waters.