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Tube Trailers- Secondary Containment Disclosure Number: IPCOM000019371D
Publication Date: 2003-Sep-12
Document File: 3 page(s) / 73K

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When is a "container" not a "container"? When it leaks!

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Tube Trailers- Secondary Containment

When is a “container” not a “container”? When it leaks!

Shipping regulations have been ever evolving, with the major thrust being protection of the environment and public from unwanted releases. It is not uncommon for regulations to evolve at an extremely fast rate if an incident has occurred. Slower rates of change are expected for an uneventful “mutation” to become a standard. Enter such a “mutation”, but first let us talk about another sub-species that has already “mutated” and has been very successful.

It has long been required by shipping regulations and a standard practice in the chemical industry that tanker trucks filled with hazardous liquids be equipped with both internal and external valves. The “double” valving of tanker trucks adds an additional level of spill protection in the event of a traffic accident. That is, should the external valve and associated piping be torn from the tanker during an accident the internal valve, design to survive the event, would then prevent the tanker’s contents from leaking into the environment. Thus the successful sub-species.

Currently the practice of “double” valving a tanker has not been extended to tube trailers. Tube trailers, as they are known in the compressed gas industry, are just that, trailers with between 1 and 60 plus tubes, diameters from 20 cm (8 inches) to 55 plus cm (22 inches) mounted horizontally on a chassis. Capacities of 14,200 kg of water per tube trailer are common. Ladings include nonflammable, flammable oxidizing and toxic compressed and liquefied compressed gases.

Noting that the valves used on tube trailers are usually the same valves that are used in their smaller cousins, compressed gas cylinders, is important to understanding why the “mutation” is be...