This thread is showing the symptoms of another personality war...lets inject some logic into it, perhaps the swelling will subside:
Any fuel, i.e. that which is volatile, must be treated with caution. When firedrills are conducted by the organisation I work within, one of the demonstrations is to show just how difficult it is to set fire to avtur / F34 / jet A-1, in its liquid form. It is apparent that it takes a conscientious effort to pursuade the fuel to burn. HOWEVER, the vapours coming off it are extremely inflammable(flammable, depending on your interpretation!). Not only does it ignite almost instantaneously but it spreads with lightning speed. If the fire triangle is complete, you qualify for trouble[ignition, fuel, oxygen].
Rotors running refuel provide all 3 components. Rotors stopped don,t (no ignition). Theoretically, a radio transmission or flicking a live switch could provide the ignition source.
Twice, I have been present when a filler cap had been inadvertently left off a gazelle helo and twice when it lifted into the hover, a ball of flame enveloped the mid section of the a/c before the pilot was forced to land! Those fumes were sucked straight into the engine. The rotors didn't have time to dilute the mixture.
Just because the ignition source isn't a blow torch doesn't mean to say the vapours swirling around the airframe won't just as easily ignite.
Don't try this at home: Garden debris, sprinkling of fuel to get it going, cigarette lighter 5 feet away, damn thing won't light....just sparking....whooosh! what the f**k was that.
Comparison of mil Vs civvy standards is another subject for a hot thread...
Safe refuelling
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Thermal runaway.