Billing Code - PHMSA - Department of Transportation

ignition.”
Section 176.400
Section 176.400 prescribes stowage requirements for Division 1.5, Class 4
(flammable solids) and Class 5 materials transported by vessel. Paragraph (a) requires
Class 4 (flammable solid) material and Division 5.2 (organic peroxide) materials to be kept
as cool as reasonably practicable and be stowed away from all sources of heat and ignition.
PHMSA is revising paragraph (a) to read “Class 4 (flammable solid) material and
Division 5.2 (organic peroxide) material 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 ignition.”
Paragraph (b) of this section requires Division 5.2 (organic peroxide) material to be
stowed away from living quarters or access to them. Division 5.2 (organic peroxide)
substances not requiring temperature control should be protected from radiant heat, which
includes direct rays of the sun, and stowed in a cool, well-ventilated area.
PHMSA is amending paragraph (b) to replace “should be protected from radiant
heat, which includes direct rays of the sun, and stowed in a cool, well-ventilated area” with
“must be protected from sources of heat, including radiant heat and strong sunlight, and
must be stowed in a cool, well-ventilated area.” These changes are being made to
incorporate the definitions of “protected from sources of heat” harmonize with the IMDG
Code, and to emphasize that protecting shipments of organic peroxides not requiring
temperature control from sources of heat is a requirement and not optional.
Section 176.600
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