49 C.F.R. § 192.121 Design of plastic pipe.
Title 49 - Transportation
Subject to the limitations of §192.123, the design pressure for plastic pipe is determined in accordance with either of the following formulas:
Where: P=Design pressure, gauge, kPa (psig). 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–3/2004, HDB/PDB/SDB/MRS Policies (incorporated by reference, see §192.7). For reinforced thermosetting plastic pipe, 11,000 psig (75,842 kPa). t=Specified wall thickness, mm (in). D=Specified outside diameter, mm (in). 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. [Amdt. 192–78, 61 FR 28783, June 6, 1996, as amended by Amdt. 192–85, 63 FR 37502, July 13, 1998; Amdt. 192–94, 69 FR 32894, June 14, 2004; Amdt. 192–103, 71 FR 33407, June 9, 2006]
Title 49: Transportation
PART 192—TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS
Subpart C—Pipe Design
§ 192.121 Design of plastic pipe.
