Canadian Entry To Practice (CETP) Practice Test

Intermodal portable tanks are designed to comply with specific regulations to ensure safety in the transportation of hazardous materials. The Department of Transportation (DOT) establishes these regulations to standardize safety measures across different modes of transport.

The correct answer, which references DOT specification 51, specifically pertains to the construction and design of intermodal tanks used for transporting liquefied gases, especially those that require a higher degree of insulation and pressure management. This specification encompasses a range of safety standards that include design requirements, material specifications, and testing procedures to ensure that the tanks can safely contain and transport hazardous substances through various transportation methods.

Regarding the other options, DOT 50, 52, and 53 pertain to different types of transport containers or vehicles, which do not share the same requirements or focus as those specified in DOT 51. This distinction underscores the importance of choosing the correct specification that directly applies to the intermodal portable tank design and its intended use.