[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR173.115]
[Page 477-478]
TITLE 49--TRANSPORTATION
CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF
TRANSPORTATION
PART 173_SHIPPERS_GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS--Table of Contents
Subpart D_Definitions Classification, Packing Group Assignments and
Exceptions for Hazardous Materials Other Than Class 1 and Class 7
Sec. 173.115 Class 2, Divisions 2.1, 2.2, and 2.3--Definitions.
Source: Amdt. 173-224, 55 FR 52634 Dec. 21, 1990, unless otherwise
noted.
(a) Division 2.1 (Flammable gas). For the purpose of this
subchapter, a flammable gas (Division 2.1) means any material which is a
gas at 20 [deg]C (68 [deg]F) or less and 101.3 kPa (14.7 psia) of
pressure (a material which has a boiling point of 20 [deg]C (68 [deg]F)
or less at 101.3 kPa (14.7 psia)) which--
(1) Is ignitable at 101.3 kPa (14.7 psia) when in a mixture of 13
percent or less by volume with air; or
(2) Has a flammable range at 101.3 kPa (14.7 psia) with air of at
least 12 percent regardless of the lower limit.
Except for aerosols, the limits specified in paragraphs (a)(1) and
(a)(2) of this section shall be determined at 101.3 kPa (14.7 psi) of
pressure and a temperature of 20 [deg]C (68 [deg]F) in accordance with
ASTM E681-85, Standard Test Method for Concentration Limits of
Flammability of Chemicals or other equivalent method approved by the
Associate Administrator. The flammability of aerosols is determined by
the tests specified in Sec. 173.306(i) of this part.
(b) Division 2.2 (non-flammable, nonpoisonous compressed gas--
including compressed gas, liquefied gas, pressurized cryogenic gas,
compressed gas in solution, asphyxiant gas and oxidizing gas). For the
purpose of this subchapter, a non-flammable, nonpoisonous compressed gas
(Division 2.2) means any material (or mixture) which--
(1) Exerts in the packaging an absolute pressure of 280 kPa (40.6
psia) or greater at 20 [deg]C (68 [deg]F), and
(2) Does not meet the definition of Division 2.1 or 2.3.
(c) Division 2.3 (Gas poisonous by inhalation). For the purpose of
this subchapter, a gas poisonous by inhalation (Division 2.3) means a
material which is a gas at 20 [deg]C (68 [deg]F) or less and a pressure
of 101.3 kPa (14.7 psia) (a material which has a boiling point of 20
[deg]C (68 [deg]F) or less at 101.3 kPa (14.7 psia)) and which--
(1) Is known to be so toxic to humans as to pose a hazard to health
during transportation, or
(2) In the absence of adequate data on human toxicity, is presumed
to be toxic to humans because when tested on laboratory animals it has
an LC50 value of not more than 5000 mL/m\3\ (see Sec.
173.116(a) of this subpart for assignment of Hazard Zones A, B, C or D).
LC50 values for mixtures may be determined using the formula in Sec.
173.133(b)(1)(i) or CGA Pamphlet P-20 (incorporated by reference; see
Sec. 171.7 of this subchapter).
(d) Non-liquefied compressed gas. A gas, which when packaged under
pressure for transportation is entirely gaseous at -50 [deg]C (-58
[deg]F) with a critical temperature less than or equal to -50 [deg]C (-
58 [deg]F), is considered to be a non-liquefied compressed gas.
(e) Liquefied compressed gas. A gas, which when packaged under
pressure for transportation is partially liquid at temperatures above -
50 [deg]C (-58 [deg]F), is considered to be a liquefied compressed gas.
A liquefied compressed gas is further categorized as follows:
(1) High pressure liquefied gas which is a gas with a critical
temperature between -50 [deg]C (-58 [deg]F) and + 65 [deg]C (149
[deg]F), and
(2) Low pressure liquefied gas which is a gas with a critical
temperature above + 65 [deg]C (149 [deg]F).
(f) Compressed gas in solution. A compressed gas in solution is a
non-liquefied compressed gas which is dissolved in a solvent.
(g) Cryogenic liquid. A cryogenic liquid means a refrigerated
liquefied gas having a boiling point colder than [chyph]-90 [deg]C (-130
[deg]F) at 101.3 kPa (14.7 psia) absolute. A material meeting this
definition is subject to requirements of this subchapter without regard
to whether
[[Page 478]]
it meets the definition of a non-flammable, non-poisonous compressed gas
in paragraph (b) of this section.
(h) Flammable range. The term flammable range means the difference
between the minimum and maximum volume percentages of the material in
air that forms a flammable mixture.
(i) Service pressure. The term service pressure means the authorized
pressure marking on the packaging. For example, for a cylinder marked
``DOT 3A1800'', the service pressure is 12410 kPa (1800 psig).
(j) Refrigerant gas or Dispersant gas. The terms Refrigerant gas and
Dispersant gas apply to all nonpoisonous refrigerant gases; dispersant
gases (fluorocarbons) listed in Sec. 172.101 of this subchapter and
Sec. Sec. 173.304, 173.314(c), 173.315(a), and 173.315(h) and mixtures
thereof; and any other compressed gas having a vapor pressure not
exceeding 260 psia at 54 [deg]C(130 [deg]F), used only as a refrigerant,
dispersant, or blowing agent.
[Amdt. 173-224, 55 FR 52634, Dec. 21, 1990, as amended at 56 FR 66268,
Dec. 20, 1991; 57 FR 45461, Oct. 1, 1992; Amdt. 173-236, 58 FR 50236,
Sept. 24, 1993; Amdt. 173-234, 58 FR 51532, Oct. 1, 1993; Amdt. 173-241,
59 FR 67506, Dec. 29, 1994; Amdt. 173-255, 61 FR 50625, Sept. 26, 1996;
66 FR 45379, 45380, 45382, Aug. 28, 2001; 67 FR 51642, Aug. 8, 2002; 67
FR 16013, Sept. 27, 2002; 68 FR 45033, July 31, 2003]