In February 2024, the Federal Motor Carrier Safety Administration (FMCSA) and PHMSA issued a safety advisory to provide notice of the possibility of catastrophic failure of nurse tanks. This notice focused on nurse tanks manufactured from January 1, 2007, through December 31, 2011, by American Welding and Tank (AWT) at its Fremont, Ohio plant. Nurse tanks manufactured by AWT from 2009 to 2010 were the subject of a prior FMCSA investigation and enforcement action in response to improper manufacturing procedures. On August 23, 2023, a 2009 AWT nurse tank containing anhydrous ammonia experienced a catastrophic failure in a farm co-op lot, resulting in the release of all product. The failure caused the tank shell to “rocket” over 300 feet from its original location. While no injuries were reported, this event is an indicator of potential continuing problems with AWT nurse tanks that have now been in service for over a decade. As a result of this incident, the owner of the nurse tank involved contracted with a third-party testing company to examine their AWT nurse tanks that were manufactured between 2008 and 2012. Radiographic testing showed that 7 of 8 nurse tanks exhibited extreme stress corrosion cracking (SCC), porosity, and inclusions or voids in the welds where the heads and shells were joined.
This brochure provides several non-destructive testing options to enhance safety pertaining to nurse tanks containing anhydrous ammonia. These testing options include periodic visual, thickness, pressure, radiographic, or ultrasonic testing.
CLICK HERE for the PHMSA Brochure