49 CFR 173.40 - General packaging requirements for toxic materials packaged in cylinders.
(1) A cylinder must conform to a DOT specification or UN standard prescribed in subpart C of part 178 of this subchapter, or a TC, CTC, CRC, or BTC cylinder authorized in § 171.12 of this subchapter, except that acetylene cylinders and non-refillable cylinders are not authorized. The use of UN tubes and MEGCs is prohibited for Hazard Zone A materials.
(b)Outage and pressure requirements. For DOT specification cylinders, the pressure at 55 °C (131 °F) of Hazard Zone A and Hazard Zone B materials may not exceed the service pressure of the cylinder. Sufficient outage must be provided so that the cylinder will not be liquid full at 55 °C (131 °F).
(1) Each plug or valve must have a taper-threaded connection directly to the cylinder and be capable of withstanding the test pressure of the cylinder without damage or leakage. For UN pressure receptacles, each valve must be capable of withstanding the test pressure of the pressure receptacle and be connected directly to the pressure receptacle by either a taper thread or other means which meets the requirements of ISO 10692-2: (IBR, see § 171.7 of this subchapter).
(2) Each valve must be of the packless type with non-perforated diaphragm, except that, for corrosive materials, a valve may be of the packed type with an assembly made gas-tight by means of a seal cap with gasketed joint attached to the valve body or the cylinder to prevent loss of material through or past the packing.
(3) Each valve outlet must be sealed by a threaded cap or threaded solid plug and inert gasketing material.
(4) The materials of construction for the cylinder, valves, plugs, outlet caps, luting, and gaskets must be compatible with each other and with the lading.
(d)Additional handling protection. Each cylinder or cylinder overpack combination offered for transportation containing a Division 2.3 or 6.1 Hazard Zone A or B material must conform to the valve damage protection performance requirements of this section. In addition to the requirements of this section, overpacks must conform to the overpack provisions of § 173.25.
(1) DOT specification cylinders must conform to the following:
(i) Each cylinder with a wall thickness at any point of less than 2.03 mm (0.08 inch) and each cylinder that does not have fitted valve protection must be overpacked in a box. The box must conform to overpack provisions in § 173.25. Box and valve protection must be of sufficient strength to protect all parts of the cylinder and valve, if any, from deformation and breakage resulting from a drop of 2.0 m (7 ft) or more onto a non-yielding surface, such as concrete or steel, impacting at an orientation most likely to cause damage. “Deformation”means a cylinder or valve that is bent, distorted, mangled, misshapen, twisted, warped, or in a similar condition.
(ii) Each cylinder with a valve must be equipped with a protective metal or plastic cap, other valve protection device, or an overpack which is sufficient to protect the valve from breakage or leakage resulting from a drop of 2.0 m (7 ft) onto a non-yielding surface, such as concrete or steel. Impact must be at an orientation most likely to cause damage.
(2) Each UN cylinder containing a Hazard Zone A or Hazard Zone B material must have a minimum test pressure in accordance with P200 of the UN Recommendations (IBR, see § 171.7 of this subchapter). For Hazard Zone A gases, the cylinder must have a minimum wall thickness of 3.5 mm if made of aluminum alloy or 2 mm if made of steel or, alternatively, cylinders may be packed in a rigid outer packaging that meets the Packing Group I performance level when tested as prepared for transport, and that is designed and constructed to protect the cylinder and valve from puncture or damage that may result in release of the gas.
- 49 CFR 173.301 — General Requirements for Shipment of Compressed Gases and Other Hazardous Materials in Cylinders, UN Pressure Receptacles and Spherical Pressure Vessels.
- 49 CFR 173.227 — Materials Poisonous by Inhalation, Division 6.1, Packing Group I, Hazard Zone B.
- 49 CFR 173.198 — Nickel Carbonyl.
- 49 CFR 171.7 — Reference Material.
- 49 CFR 173.228 — Bromine Pentafluoride or Bromine Trifluoride.
- 49 CFR 173.226 — Materials Poisonous by Inhalation, Division 6.1, Packing Group I, Hazard Zone A.
- 49 CFR 173.193 — Bromoacetone, Methyl Bromide, Chloropicrin and Methyl Bromide or Methyl Chloride Mixtures, Etc.
- 49 CFR 173.195 — Hydrogen Cyanide, Anhydrous, Stabilized (Hydrocyanic Acid, Aqueous Solution).
- 49 CFR 173.192 — Packaging for Certain Toxic Gases in Hazard Zone A.
- 49 CFR 173.337 — Nitric Oxide.