PPRuNe Forums - View Single Post - Smoking next to an aircraft being refuelled.
Old 22nd Sep 2019, 16:50
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The Ancient Geek
 
Join Date: May 2010
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An empty tank is full of vapour. When you fill the tank this displaces the vapour which overflows, (heavier than air), falls to the ground to make a puddle of vapour. This could very well be an ignition hazard especially on a calm day.
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