Ignition of Leaking Hydrogen from Pressure Transmitter Tubing

First Name
Andy
Last Name
Piatt

An instrument engineer at a hydrogen production facility was arresting the hydrogen leakage in tapping a pressure transmitter containing 131-bar hydrogen gas. The isolation valve was closed and the fittings near the pressure transmitter were loosened. The pressure dropped from 131 bar to 51 bar. The fitting was further loosened (though very little); the instrument tube slipped out of the ferrule and got pulled out of the fitting. With the sudden release of the 51-bar hydrogen, there was a loud pop (like a fire cracker) and the spark-proof tool was observed to have black spot on it.

Small-Scale Chemical Reaction Flash

First Name
Andy
Last Name
Piatt

On July 1, 2009, a plasma experiment was conducted to produce a small quantity of sodium borohydride from anhydrous sodium borate, methane, and hydrogen in an enclosed reaction chamber. The reactants were injected into an argon plasma flame to carry out the synthesis reaction.

Potential Catalyst Fire Hazard with Oxygen Generator Filter Change-out Maintenance

First Name
Andy
Last Name
Piatt

Within the International Space Station (ISS) oxygen generator, an increase in differential pressure across a pump supplying return water to a PEM electrolyzer fuel cell stack had persisted over a 4-month period and was approaching the shut-off limit for the system. This decrease in performance was suspected to be caused by water-borne catalyst fines containing platinum black and TeflonĀ®* binder materials, shed by the fuel cell stack, and accumulated within the pump's inlet filter. Maintenance in the field was required.

Leak in Liquid Hydrogen Pump Causes Explosion/Fire at Hydrogen Transfilling/Pumping System

First Name
Andy
Last Name
Piatt

A leaking liquid hydrogen cryogenic pump shaft during the process of filling a gaseous tube delivery trailer to 2400 psi at a liquid hydrogen transfilling location caused a series of explosions and a fire. After approximately 30 minutes of filling, the operator heard a single loud explosion and then saw flames and ripples from heat generation near the ground in the hydrogen fill area. The operator quickly actuated the emergency alarm system that shut down the cryogenic pump and closed the air-actuated valves on the cryogenic pump supply line.

Reacting Ammonia Borane Exposure to Air

First Name
Andy
Last Name
Piatt

While performing hydrogen gas release experimentation by thermally reacting a slurry of ammonia borane powder in silicone oil in a plug flow reactor, a discharge port on the test reactor became loose. A foaming white product was leaking from the fitting and discharging in the direction of the heat tape and insulation (back over the reactor). As a result, hot, reacting slurry flowed out of the port and was exposed to air. In the presence of oxygen, the slurry ignited, producing a green flame.

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