2.1.6 Gaseous Hydrogen Leaks
Because hydrogen molecules are so small, leaking hydrogen gas rises and diffuses quickly. A gaseous hydrogen leak tends to create a very vertical, fairly narrow area in which the hydrogen-air mix is flammable. Outside of this region, the hydrogen concentration is too low for the mixture to burn.
Depending on size and flow rate, the leak may produce a hissing sound similar to other gas leaks.
Gaseous hydrogen leaks may self-ignite due to static electricity or heating created by the flow of hydrogen. If the leak does ignite, the flame will be virtually invisible in daylight.
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