Over The Road Tanks Flashcards
What are the primary types of railcars used in hazmat transportation?
Pressure tank cars, non-pressure tank cars, boxcars, hopper cars.
What is the gross weight capacity of modern railcars in the U.S.?
286,000 lbs.
What markings are commonly found on railcars?
Reporting marks, car numbers, empty weight, placards, qualification dates, pressure relief info, car specs, and commodity names.
What pressure do pressurized tank cars typically operate at?
Above 40 psi.
What types of materials do pressure tank cars transport?
Liquefied gases, flammable, non-flammable, toxic, and/or compressed gases.
What key safety feature do pressure tank cars have to prevent leaks?
All fittings and valves are located under a protective dome on top.
What pressure range do non-pressurized tank cars typically operate under?
Below 25 psi.
What is the most common general-service non-pressure tank car?
DOT-111.
What hazardous materials can DOT-111 cars carry?
Flammable liquids, corrosives, and some hazardous chemicals.
What tank car was introduced as a safer alternative to DOT-111?
DOT-117.
What improvements does the DOT-117 have over the DOT-111?
Thicker steel shell, full-height head shields, thermal protection, improved bottom outlet valves.
Why was the DOT-117 tank car developed?
After the 2013 Lac-Mégantic disaster to improve crude oil and ethanol transportation safety.
What tank car is designed for transporting refrigerated liquefied gases?
DOT-113.
What type of insulation does a DOT-113 cryogenic tank car use?
Vacuum insulation with an inner and outer tank.
What is a major hazard of cryogenic tank cars?
Rupture can cause rapid gas expansion and overpressurization.
What is the purpose of a boxcar in hazmat transport?
Encloses cargo to protect from the elements; may transport hazardous goods in totes or drums.
What are the two types of hopper cars?
Open-top and covered hopper cars.
What materials are commonly transported in hopper cars?
Dry bulk freight like cement, fertilizer, grain, and coal.
What are the most common types of road trailers for hazardous materials?
MC331, MC338, DOT406, DOT412, TC423, tube trailers, dry bulk, vacuum tankers, mixed cargo, intermodal tanks.
What road trailer is used for transporting liquefied compressed gases under high pressure?
MC331.
What’s the working pressure range of an MC331 trailer?
100-500 psi.
What hazardous materials are transported in an MC331?
LPG, ammonia, chlorine, propane.
What road trailer transports refrigerated liquefied gases?
MC338.
What pressure range do MC338 cryogenic trailers operate at?
25-500 psi.
