Safety System (Shear Coupling & Sensor) failure during bulk transfer (Railcar) enabled anhydrous ammonia release
In August 2024, while loading anhydrous ammonia into a railcar at a manufacturing site, a shear coupling on the loadout arm failed to function. Two out of three bolts failed, causing the coupling to open and resulting in a loss of primary containment (LOPC) of pressurized liquefied ammonia, which formed an ammonia vapor cloud. A…...