This Code excludes the following:
(a) piping systems designed for internal gauge pressures
at or above zero but less than 105 kPa (15 psi),
provided the fluid handled is nonflammable, nontoxic,
and not damaging to human tissue as defined in 31.3,
and its design temperature is from −29°C (−20°F)
through 186°C (366°F);
(b) power boilers in accordance with B&PV Code2
Section I and boiler external piping which is required
to conform to B31.1;
(c) tubes, tube headers, crossovers, and manifolds
of fired heaters, which are internal to the heater enclosure;
and
(d) pressure vessels, heat exchangers, pumps, compressors,
and other fluid handling or processing equipment,
including internal piping and connections for
external piping.
