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.

Leak at Breakaway Fitting

First Name
Andy
Last Name
Piatt

A vehicle fill was initiated by the operator. During the hose pressurization step, a leak was observed at the breakaway fitting. The operator pressed the emergency stop to terminate the fill.

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