49 CFR 176.174
Transport of Class 1 (explosive) materials in shipborne barges.
(a)Fixed magazines may be built within a shipboard barge. Freight containers may be used as magazines within a barge.#
(b)Shipborne barges may be used for the carriage of all types of Class 1 (explosive) materials. When carrying Class 1 (explosive) materials requiring special stowage, the following requirements apply:#
(1)Class 1 (explosive) materials in compatibility group G or H must be stowed in freight containers.#
(2)Class 1 (explosive) materials in compatibility group K or L must be stowed in steel magazines.#
(c)Class 1 (explosive) materials of different compatibility groups may not be stowed within the same shipborne barge unless under § 176.144(b) of this subpart they are authorized to be stowed in the same compartment.#