[Code of Federal Regulations]
[Title 49, Volume 3]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR192.121]

[Page 41]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                       TRANSPORTATION (CONTINUED)
 
PART 192_TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM 
FEDERAL SAFETY STANDARDS--Table of Contents
 
                          Subpart C_Pipe Design
 
Sec. 192.121  Design of plastic pipe.

    Subject to the limitations of Sec. 192.123, the design pressure for 
plastic pipe is determined in accordance with either of the following 
formulas:
[GRAPHIC] [TIFF OMITTED] TR06JN96.013

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 [deg]F (23 
[deg]C), 100 [deg]F (38 [deg]C), 120 [deg]F (49 [deg]C), or 140 [deg]F 
(60 [deg]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 TR-3/2000 entitled, 
Policy for Determining Long-Term Strength (LTHS) by Temperature 
Interpolation, as published in the technical Report TR-3/2000 ``HDB/PDB/
MRS Policies'', (ibr, see Sec. 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]