[Code of Federal Regulations]
[Title 49, Volume 3]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR192.121]

[Page 39]
 
                        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 long-term hydrostatic strength determined 
in accordance with the listed specification at a temperature equal to 
73F (23C), 100F 
(38C), 120F (49C), or 
140F (60C); for reinforced thermosetting 
plastic pipe, 11,000 psi (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]