We provide inspection services to the standards of the United States Department of Transportation (DOT).
DOT cylinders are used in all 50 states in the USA for the transportation of non-flammable, flammable and poisonous materials. Because they are used in transportation, weight is an important consideration. For this reason they use thinner walls than ASME tanks and must be periodically re-certified and marked.
DOT pressure vessels are built to DOT specifications for a rated pressure and have one or more dates stamped on the cylinder, as such the cylinders cannot be filled if the date on the cylinder has passed. DOT cylinders may be legally shipped and used at pressures up to their rated pressure.