Fred J. McCall wrote in
:

"John R Weiss" wrote:

:In the US navy, the nuclear powered carriers only carry JP4 or JP8
and all on-board diesel-powered equipment use the JP), so any smaller
:ships that refuel from the carrier (a relatively common practice) get
:the jet fuel.

The US Navy uses neither of these fuels at sea, even to fill aircraft,
much less to fill large ship's tanks. The Navy switched from JP4
(which is a hideously dangerous fuel) to JP5 about half a century ago.
The Air Force later switched from JP4 to JP8 (essentially Jet-A).

IIRC the minimum allowed flash point is 140F. I uderstand that even
a little JP4, if mixed with JP5, can dangerously lower flash point.

scott s.
..