Little General Store Propane Explosion - US Chemical Safety and ...

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Little General Store September 2008 the public away from the area surrounding the point of the release. In addition, the Guidebook states that propane gas is heavier than air and may settle in low or confined areas. 26
Little General Store September 2008 5.0 Incident and Emergency Response Analysis 5.1 Liquid Withdrawal Valve Liquid withdrawal valves are rarely used. Technicians only open them when tanks must be completely emptied of liquid. The liquid withdrawal valves on most propane tanks may never be used. At Little General, the day of the incident was either the first or the second time that the plug had been removed from the liquid withdrawal valve in the tank’s 19 years of propane service. When the junior technician removed the plug from the liquid withdrawal valve, liquid propane released uncontrollably. The plug, though, has a telltale drilled through the threaded portion (Figure 7) which should have released a small stream of propane once the plug was partially backed out. This should have alerted the technician that the valve was leaking. Figure 7. Incident valve plug (Telltale circled). 27
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Little General Store Propane Explosion - US Chemical Safety and ...

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