TITLE 49 - TRANSPORTATION

SUBTITLE B - OTHER REGULATIONS RELATING TO TRANSPORTATION

CHAPTER I - PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

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 in accordance with either of the following formulas: (image) View or download PDF Where: P=Design pressure, gauge, kPa (psig).

S = For thermoplastic pipe, the HDB 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 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 E of PPI TR3/2000 entitled, Policy for Determining Long-Term Strength (LTHS) by Temperature Interpolation, as published in the technical Report TR3/2000 HDB/PDB/MRS Policies, (ibr, 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. 19278, 61 FR 28783, June 6, 1996, as amended by Amdt. 19285, 63 FR 37502, July 13, 1998; Amdt. 19294, 69 FR 32894, June 14, 2004]