Billing Code - PHMSA - Department of Transportation

containers used to transport Class 1 (explosive) materials for which magazine stowage type
A is required must have a floor consisting of tightly fitted wooden boards, plywood or
equivalent non-metallic material, and a non-metallic lining.
PHMSA is amending paragraph (a) and deleting and reserving paragraph (c).
Paragraph (a) is revised to state that when Class 1 materials are stowed in a freight
container, the freight container, for the purposes of this subpart G of Part 176, may be
regarded as a closed transport unit for Class 1 or a magazine but not a separate
compartment. This change is being made to incorporate the definition of “closed cargo
transport unit for Class 1” and the removal of magazine stowage A, C, and Special
Stowage. Paragraph (c) references freight containers used to transport Class 1 (explosive)
materials for which magazine stowage type A is required. The removal of a definition for
and requirements for magazine stowage type A make this paragraph unnecessary.
Section 176.200
Section 176.200 prescribes general stowage requirements for Class 2 materials
transported by vessel. Paragraph (c) of this section prescribes the orientation and outer
packaging requirements for cylinders transported by vessel.
PHMSA is revising paragraph (c) to clarify that cylinders offered for transport by
vessel in a vertical position must be stowed in either a block and cribbed or boxed-in with
suitable sound lumber. PHMSA is also replacing the word movement with shifting in the
requirement for the crib or box bracing to prevent any movement. These revisions are to
harmonize with vessel transportation requirements incorporated in the IMDG Code and
clarify that cylinders stored in a vertical position must be adequately blocked and braced
using sound lumber.
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