Hydrochloric acid

Source: Reprinted from Office of Technology Assessment, 1986.

Source: Reprinted from Office of Technology Assessment, 1986.

porting pressurized hazardous materials are DOT 105, 112, and 114 (Table 11.10.3); for unpressurized shipments the numbers are DOT 103, 104, and 111 (Table 11.10.4). Specifications call for steel jacket plate and thickness ranging from 11ga (approximately 1/83 in.) to 3/4 in and aluminum jacket plate thickness of 1/2 to 5/83 in. Capacities for tank cars carrying hazardous materials are limited to 34,500 gal or 263,000 lb gr wt. It is proposed that the gross rail load (GRL) limits on 100-tn trucks be increased to 286,000 lb gr.

Because of regulations and industry initiatives, the tank car of the future may be only three to five years away (Snelgrove 1995). This tank car design will most likely be based on non-accident release (NAR) products. Changes will probably include safety valves or surge devices to replace the safety vent; elimination of bottom loading; improved versions of today's manway design; and the equivalent of pressure heads for non-pressure DOT 111A-specification tank cars.

In recent years, the DOT has significantly revised hazardous materials classifications, hazard communications, and packaging requirements to agree with other national and international United Nations (UN) codes. In the coming years, these regulations will cover every shipping container, from drums and intermediate bulk containers (IBCs), to tractor trailers, and rail tank cars.

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