49 CFR 192.121 - Design of plastic pipe.
Title 49: TransportationSubtitle B: Other Regulations Relating to Transportation (Continued) CHAPTER I: PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) SUBCHAPTER D: PIPELINE SAFETY PART 192: TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Subpart C: Pipe Design 192.121 - Design of plastic pipe. Subject to the limitations of ? 192.123, the design pressure for plastic pipe is determined by either of the following formulas: ER30NO09.008 Where: P = Design pressure, gauge, psig (kPa).S = For thermoplastic pipe, the HDB is determined in accordance with the listed specification at a temperature equal to 73 ?F (23 ?C), 100 ?F (38 ?C), 120 ?F (49 ?C), or 140 ?F (60 ?C). In the absence of an HDB established at the specified temperature, the HDB of a higher temperature may be used in determining a design pressure rating at the specified temperature by arithmetic interpolation using the procedure in Part D.2 of PPI TR-3/2008, HDB/PDB/SDB/MRS Policies (incorporated by reference, see ? 192.7). For reinforced thermosetting plastic pipe, 11,000 psig (75,842 kPa). [Note: Arithmetic interpolation is not allowed for PA-11 pipe.] t = Specified wall thickness, inches (mm). D = Specified outside diameter, inches (mm). SDR = Standard dimension ratio, the ratio of the average specified outside diameter to the minimum specified wall thickness, corresponding to a value from a common numbering system that was derived from the American National Standards Institute preferred number series 10. D F = 0.32 or = 0.40 for PA-11 pipe produced after January 23, 2009 with a nominal pipe size (IPS or CTS) 4-inch or less, and a SDR of 11 or greater (i.e. thicker pipe wall). [Amdt. 192-111, 74 FR 62505, Nov. 30, 2009, as amended by Amdt. 192-114, 75 FR 48603, Aug. 11, 2010]