Billing Code - PHMSA - Department of Transportation

Section 176.600 prescribes detailed requirements for Division 2.3 (Poisonous Gas)
and Division 6.1 (Poisonous) materials transported by vessel. Paragraph (d) of this section
requires each package of Division 2.3 (poisonous gas) material or Division 6.1 (poison)
material that also bears a FLAMMABLE LIQUID or FLAMMABLE GAS label must be
stowed in a mechanically ventilated space, kept as cool as reasonably practicable, and be
stowed away from all sources of heat and ignition.
PHMSA is revising paragraph (d) to replace “stowed away from all sources of heat
and ignition” with “protected from sources of heat and stowed away from potential sources
of ignition.” These changes incorporate the definitions of “protected from sources of heat”
and “potential or possible sources of ignition.”
PHMSA received one comment from Horizon requesting that the mechanically
ventilated space and protected from sources of ignition stowage requirements be applied
only to 2.3 materials and 6.1 materials that are toxic by inhalation. The proposal in the
NPRM was done solely to change the terminology based on the adoption of new
international definitions for “protected from sources of heat” and “potential or possible
sources of ignition.” No changes to the actual commodities that require such segregation
were proposed or will be implemented in this rulemaking.
Section 176.907
Section 176.907 is created to incorporate cargo transport requirements for
shipments of UN2211, Polymeric Beads, Expandable evolving flammable vapor and
UN3314, Plastics Molding Compound in dough, sheet or extruded rope form, evolving
flammable vapor. Several cases of damage to cargo transport units were presented to the
IMO with the root cause being identified as the release of flammable pentane gas during
118