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(a) The design pressure may not exceed a gauge pressure of 689 kPa (100 psig) 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°F (−20°C), or −40°F (−40°C) if all pipe and pipeline components whose operating temperature will be below −29°C (−20°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 long-term hydrostatic strength used in the design formula under § 192.121 is determined. However, if the pipe was manufactured before May 18, 1978 and its long-term hydrostatic strength was determined at 73°F (23°C), it may be used at temperatures up to 100°F (38°C).
(ii) For reinforced thermosetting plastic pipe, 150°F (66°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)
------------------------------------------------------------------------
[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]