(9) “W” codes. These provisions apply only to transportation by water:

Code/Special Provisions

W7  Vessel stowage category for uranyl nitrate hexahydrate solution is “D” as defined in §172.101(k)(4).

W8  Vessel stowage category for pyrophoric thorium metal or pyrophoric uranium metal is “D” as defined in §172.101(k)(4).

W9  When offered for transportation by water, the following Specification packagings are not authorized unless approved by the Associate Administrator: woven plastic bags, plastic film bags, textile bags, paper bags, IBCs and bulk packagings.

W10  When offered for transportation by vessel, the use of Large Packagings (see §171.8 of this subchapter) is prohibited.

W41  When offered for transportation by water, this material must be packaged in bales and be securely and tightly bound with rope, wire or similar means.