At a brewery in 1997, an operator confused filling nozzles for two commonly used acid cleaning agents and transferred nitric acid into a tank with P3, a proprietary phosphoric acid based cleaner that also contained 5-15 percent isopropanol. 10-15 minutes later the mixture exploded violently. The stainless steel tank disintegrated with such force that fragments lodged in walls of concrete. The explosion ravaged the cellar, destroyed equipment, blew out a masonry wall and released large amounts of nitrous oxide fumes. Likely, 62 percent nitric acid (CAS 7697-37-2) and isopropanol (2-propanol, CAS 67-63-0) reacted to produce isopropyl nitrate (nitric acid 1-methylethyl ester, CAS 1712-64-7), a rocket propellant. It is argued that the accident has broad learning potential because of the widespread usage of the two chemicals across industries, the innocent nature of the human error and the severity of the consequence. CLICK HERE to read report.
The purpose of this project is to analyze a ruptured 1000 gallon NH3 tank to determine the crack initiation site (CIS) and the cause of the tank failure. On 11/21/2007 it was reported that, “a nurse tank carrying anhydrous ammonia exploded and pieces were found laying in the front yard of a farm just outside of Silver Lake, Minnesota. The driver was taken to the hospital due to exposure to the NH3.” The incident occurred near Kale Avenue (McLeod County 90), just south of MTH 7. A scene investigation revealed the tank had torn off its running gear, impacted the back of the pick-up truck (tow vehicle) and then was propelled across the front yard of a farm. All the NH3 had been expelled from the 1000 gallon capacity tank and dissipated. The tank is owned by Crop Production Services, Inc (CPS), (DOT # 300176). CLICK HERE for 3rd Party Report
Recent investigations conducted by the U.S. Department of Transportation, Federal Motor Carrier Safety Administration (FMCSA) on USDOT specification cargo tank testing and repair facilities have resulted in a consistent pattern of non-compliance regarding bench testing of Pressure Relief Devices (PRD). Specifically, cargo tank testing and repair facilities are either failing to bench test PRDs or failing to test them appropriately by not determining the proper start-to-discharge and closing pressures.
In 2015 we saw six (6) unloading accidents that involved serious injuries to workers, with some of the workers injured being those who were in the WRONG place at the WRONG time. Here is a summary of these six (6) incidents. PLEASE take notice that 4 of the 6 incidents involved UNLOADING HOSES. These temporary connections are almost always our weakest link in our process and such we MUST give these activities and their connections SPECIAL ATTENTION...
Repair work for liquefied carbon dioxide at a low-temperature storage tank (CE) in a steel mill was carried out. At the time, the main block valve below the safety valves was closed, while liquid CO2 remained in the tank. In addition, the heat source from the tank heater was still active. Therefore, in the tank, the temperature rose and pressure increased, and the low-temperature storage tank exploded. A vapor explosion of carbon dioxide occurred due to the rapid pressure drop.