[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: 49CFR192.123]

[Page 41-42]
 
                        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. 192.123  Design limitations for plastic pipe.

    (a) Except as provided in paragraph (e) of this section, the design 
pressure

[[Page 42]]

may not exceed a gauge pressure of 100 psig (689 kPa) for plastic pipe 
used in:
    (1) Distribution systems; or
    (2) Classes 3 and 4 locations.
    (b) Plastic pipe may not be used where operating temperatures of the 
pipe will be:
    (1) Below -20[deg]F (-20[deg]C), or -40[deg]F (-40[deg]C) if all 
pipe and pipeline components whose operating temperature will be below -
29[deg]C (-20[deg]F) have a temperature rating by the manufacturer 
consistent with that operating temperature; or
    (2) Above the following applicable temperatures:
    (i) For thermoplastic pipe, the temperature at which the HDB used in 
the design formula under Sec. 192.121 is determined.
    (ii) For reinforced thermosetting plastic pipe, 150[deg]F 
(66[deg]C).
    (c) The wall thickness for thermoplastic pipe may not be less than 
0.062 inches (1.57 millimeters).
    (d) The wall thickness for reinforced thermosetting plastic pipe may 
not be less than that listed in the following table:

------------------------------------------------------------------------
                                                           Minimum wall
                                                             thickness
          Nominal size in inches (millimeters).               inches
                                                          (millimeters).
------------------------------------------------------------------------
2 (51)..................................................   0.060 (1.52)
3 (76)..................................................   0.060 (1.52)
4 (102).................................................   0.070 (1.78)
6 (152).................................................   0.100 (2.54)
------------------------------------------------------------------------

    (e) The design pressure for thermoplastic pipe produced after 
[insert effective date of final rule] may exceed a gauge pressure of 100 
psig (689 kPa) provided that:
    (1) The design pressure does not exceed 125 psig (862 kPa);
    (2) The material is a PE2406 or a PE3408 as specified within ASTM 
D2513 (ibr, see Sec. 192.7);
    (3) The pipe size is nominal pipe size (IPS) 12 or less; and
    (4) The design pressure is determined in accordance with the design 
equation defined in Sec. 192.121.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-31, 43 FR 13883, 
Apr. 3, 1978; Amdt. 192-78, 61 FR 28783, June 6, 1996; Amdt. 192-85, 63 
FR 37502, July 13, 1998; Amdt. 192-93, 68 FR 53900, Sept. 15, 2003; 69 
FR 32894, June 14, 2004; Amdt. 192-94, 69 FR 54592, Sept. 9, 2004]