Tank cars transporting corrosive liquids are often equipped with safety vents which employ frangible discs to protect the tank from over-pressurization during fires. Premature failure of the frangible disc occasionally occurs during switching operations. The failure is caused by surge pressures resulting from liquid movement inside the tank car during switching speeds above 4 mph. These surger pressures can exceed the rated pressure of the disc, causing it to break. Once the disc is broken, product can repeatedly discharge through the safety vent during routine car handling. If railroad personnel are exposed to the discharged product, serious injury can result. In order to characterize the surge pressures, which can occur inside a moving tank car, a series of full-scale impact tests were performed. In these tests a locomotive ws coupled into a stationary DOT 111A100W2 tank car filled with water. Resulting surge pressures were measured in safety vent nozzles installed at three locations along the length of the car. The impact conditions leading to disc rupture were characterized, and several flow restriction devices designed to prevent premature failure of the discs were tested.
Surge pressures in tank cars cotaining corrosive liquids
Druckstöße in Tankwagen mit korrosiven Flüssigkeiten
1991
4 Seiten, 8 Bilder, 1 Tabelle, 1 Quelle
Aufsatz (Konferenz)
Englisch
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