Billing Code - PHMSA - Department of Transportation

Section 176.138 prescribes general requirements for on deck stowage. Paragraph
(b) provides general requirements for on deck stowage of explosives. In this final rule,
PHMSA is revising this section to require explosives to not be stowed within 6 m (20 feet)
of the newly defined term “any potential sources of heat or ignition.” This change is
adopted to incorporate a newly defined term in § 176.2. PHMSA received one comment
from IVODGA requesting an editorial clarification to separate the proposed language into
“from any source of heat and any possible sources of ignition” and is making the requested
change.
Section 176.144
Section 176.144 prescribes segregation requirements for Class 1 materials
transported by vessel. Paragraph (d) allows materials requiring ordinary stowage (non-
magazine stowage) to be stowed in the same magazine as materials requiring magazine
stowage. PHMSA is revising paragraph (d) to state that if part of a shipment requires non-
metallic lining of closed cargo transport units, Class 1 materials requiring ordinary stowage
(stowage not requiring non-metallic lining of closed cargo transport units) may be stowed
in the same closed cargo transport unit provided there are no exposed parts of any ferrous
metal or aluminum alloy, unless separated by a partition. The removal of sections and
requirements for magazine stowage necessitates the change in this section.
During the review of the NPRM PHMSA noted that Table 176.144(a) includes a
reference to explosives requiring special stowage in Note: 1. This final rule removes the
special stowage section in the HMR. Therefore, PHMSA is removing the reference to
special stowage in Note 1 of Table 176.144(a).
Section 176.146
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