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Billing Code - PHMSA - Department of Transportation

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The term “Closed cargo transport unit for Class 1” is defined by the IMDG <strong>Code</strong> as<br />

a freight container or transport vehicle that fully encloses the contents by permanent<br />

structures and can be secured to the ship's structure and are, except for the carriage <strong>of</strong><br />

division 1.4 explosives, structurally serviceable (see § 176.172). Portable magazines<br />

conforming to § 176.137 are also considered closed cargo transport units for Class 1.<br />

Small compartments such as deck houses and mast lockers are included. Cargo transport<br />

units with fabric sides or tops are not closed cargo transport units. The floor <strong>of</strong> any closed<br />

cargo transport unit must either be constructed <strong>of</strong> wood, close-boarded or so arranged that<br />

goods are stowed on sparred gratings, wooden pallets or dunnage. The IMO adopted this<br />

new definition for “closed cargo transport unit for Class 1” to define the characteristics<br />

required for cargo transport units carrying explosives by vessel.<br />

A new definition for “potential or possible sources <strong>of</strong> ignition” was adopted by the<br />

IMO for incorporation in the next published IMDG <strong>Code</strong>. The term “Potential or possible<br />

sources <strong>of</strong> ignition” as defined in the IMDG <strong>Code</strong> “means but is not limited to, open fires,<br />

machinery exhausts, galley uptakes, electrical outlets and electrical equipment including<br />

those on refrigerated or heated cargo transport units unless they are <strong>of</strong> are <strong>of</strong> certified safe<br />

type.” The text “means but is not limited to” indicates that the list <strong>of</strong> potential or possible<br />

sources <strong>of</strong> ignition is not all inclusive; as it is impossible to identify in a definition all<br />

potential or possible sources <strong>of</strong> ignition that may exist on a variety <strong>of</strong> vessels with various<br />

engineering designs and stowage configurations. <strong>PHMSA</strong> is adopting a definition for<br />

“Potential or possible sources <strong>of</strong> ignition” that replaces “<strong>of</strong> certified safe type” with<br />

“designed to operate in a hazardous environment.” This change is due to some ambiguity<br />

as to what is considered a certified safe type <strong>of</strong> refrigerated or heated cargo transport unit.<br />

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