A small research sample of approximately 5 grams of aluminum hydride (alane) doped with 2-3 mol % TiCl3 contained within a glass ampoule ruptured after transit while stored in an office cabinet. The rupture was attributed to over-pressurization caused by hydrogen gas buildup within the sample over a four-month period. The glass ampoule, contained within a 0.2-inch thick cardboard shipping tube, was not a pressure-rated container. The rupture resulted in glass chards penetrating the protective cardboard shipping tube. The aluminum hydride, a fine powder, was released from the shipping tube during the pressure release. The fine aluminum powder leaked from the cabinet and set off a local smoke alarm that brought emergency responders to the scene. No personnel were present in the area when view more
While research staff were working in a lab, a staff member opened the primary valve to a 0.2" (1500 psi) hydrogen gas line connected to a manifold supplying instruments in the lab. Upon opening the valve, the hydrogen gas line failed at a fitting on the switching manifold, releasing a small amount of hydrogen gas. The staff member closed the valve immediately, then inspected the gas line and found the front ferrule (of the compression-style fitting) to be missing. There were no injuries or damage to equipment.
In the follow-on discussion with research staff, it was learned that approximately one month earlier, a similar condition (front ferrule missing from a fitting) was found while performing a modification to a similar manifold. Following a critique, management expressed view more
A deficiency was discovered in the application of a hydrogen sensor in the Rotary Mode Core Sampling (RMCS) portable exhauster. The sensor is installed in the flow stream of the exhauster designed to be used with a RMCS truck for core sampling of watch list tanks, and is part of the flammable gas detector system. During the previous week, a quarterly calibration of the sensor, per maintenance procedure, was attempted by Characterization Project Operations (CPO) technicians. Ambient temperatures during the sensor calibration were approximately 20 to 30 degrees F. Inconsistencies in calibration results and the failure of the sensor to meet the response-time calibration requirement lead to the conclusion that the unit could not reliably perform its safety function at low ambient view more
A shop supervisor determined that a second shift would be necessary to complete some priority work on the spare hydrogen mitigation pump. The work scope for the shift would be dedicated to continued fabrication of designed tubing runs, repairs to existing tubing with known leaks and pressure testing of other various tubing runs. The shift craft complement would include three pipe fitters, one welder, one QC inspector and a shift supervisor.
The shift remained under normal operations prior to the event. There had been no existing problem up until the point that craft personnel implemented some hydrostatic pressure testing on some tubing runs on the spare hydrogen mitigation pump. Work activities associated with the hydrostatic testing were to be in accordance with the Hydrostatic view more
As a prerequisite to a storage tank slurry pump run, a tank operator identified a Lower Flammability Limit (LFL) Analyzer surveillance reading to the control room that was out of limits low. The reading was a negative zero % LFL indication (-0 % LFL). The tank operator roundsheet limits are 0 to 10% LFL. The "null" value (value read on analyzer when air with 0% LFL is drawn through the analyzer) as directed by the LFL Analyzer loop calibration procedure is set between 0 and 4% LFL.
To alert personnel to the buildup of potentially dangerous levels of explosive gases in the tank, a Combustible Gas Detection System is used to monitor and analyze sample air drawn from the tank vapor space. This system consists of a sensing element, a 4-20 milliAmp direct current (mADC) view more
A fire erupted from a tanker truck delivering liquid hydrogen to a factory. The ignition of leaking vapors created a plume of flames that rose dozens of feet into the air. The flames receded within seconds, leaving the truck with little damage and its driver unharmed.
The truck was off-loading hydrogen into a tank behind the plant when the incident occurred. The plant reported no delays in its production. It uses the hydrogen in various processes.
On site personnel reported that hydrogen vapors released through a vent in the tank somehow ignited. The driver sealed off the vent within seconds and stopped the blaze. Fire officials and the two companies are now trying to determine what sparked the vapors. The safety equipment in place prevented the fire from spreading into view more