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From: Wesley & Patty Eldred (no email)
Date: Thu Jan 01 2004 - 14:35:02 EST
Rob:
Someone might find this interesting -
I met a retired tugboat captain a few days ago that had skippered the
John J. Harvey for some period many years ago. The John J. Harvey is
the retired NY Fireboat that was pressed into service in the aftermath
of 9/11. She was commissioned in 1931 with five 500 hp gasoline engines
with a flexible electric power system so that power could be divided
between screws and pumps in any proportion. I expressed my surprise
that a fireboat would be equipped with gasoline engines. He pointed out
that the fuel tanks were filled with water as fuel was consumed. This
would maintain the trim of the vessel and rendered her fuel tanks
explosion-proof by eliminating air in the tanks. With the greater
density of seawater, it is tempting to visualize the gasoline being
forced to the engines by the pressure of the water with little need for
pumps. I do not know if this practice continued after JJH was converted
to diesel power in 1957.
FWIW
Wesley
wrote:
>Came across the following which might be of intererst to listees:
>
>Gas weighs 6.1 lbs/gal, diesel fuel about 7.1 lbs/gal and water about 8.3
>lbs/gal. So you can (a) figure how much extra weight is aboard when your tanks
>are full and (b) see that water is the most dense, explaining why gas and
>diesel float on the surface of water!
>
>
>Cheers,
>Rob Brueckner
>
>
>
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