Billing Code - PHMSA - Department of Transportation

Section 176.210
Section 176.210 prescribes on deck stowage requirements for cylinders transported
by vessel. This section currently requires cylinders of Class 2 materials being transported
by vessel to be protected from radiant heat, including the direct rays of the sun, by
structural erections or awnings.
In this final rule, PHMSA is revising this section by replacing “protected from
radiant heat, including the direct rays of the sun, by structural erections or awnings” with
the newly defined term “protected from sources of heat.”
Section 176.230
Section 176.230 prescribes stowage requirements for Division 2.1 materials
transported by vessel. Currently the HMR requires Division 2.1 materials transported in
Specification 106A or 110A multi-unit car tanks must be stowed on deck only, and must
be shaded from radiant heat.
In this final rule, PHMSA is replacing the phrase “shaded from radiant heat” with
the newly defined “protected from sources of heat.”
Section 176.305
Section 176.305 prescribes stowage requirements for Class 3 materials transported
by vessel. Paragraph (a) states that Class 3 flammable or combustible liquids must be kept
as cool as reasonably practicable and be stowed away from all sources of heat and ignition.
In this final rule, PHMSA is revising paragraph (a) to read “a Class 3 (flammable)
or combustible liquid must be kept as cool as reasonably practicable, protected from
sources of heat, and away from potential sources of ignition.” These changes incorporate
the definitions of “protected from sources of heat” and “potential or possible sources of
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